SMC AKP Series Compact Type Pilot Check Valve Instruction Manual

Contents hide

1 AKP Series Compact Type Pilot Check Valve

2 Specifications

3 Product Usage Instructions

3.1 Mounting Instructions

3.2 Functionality

3.3 Variations and Selection

3.4 Tubing and Port Sizes

4 FAQ

4.1 Q: What should I do before handling the products?

4.2 Documents / Resources

4.2.1 References

AKP Series Compact Type Pilot Check Valve

Specifications

Width: 14.2 mm

Height: 15.1 mm
Applicable Tubing O.D.:
- Metric size: 4, 6, 8, 10, 12
- Inch size: 5/32, 1/4, 5/16

Fluid:
- Proof pressure: 1.05 MPa
- Max. operating pressure: 0.7 MPa
- Min. operating pressure: 0.1 MPa
- Pilot check valve operating pressure: 50% or more of the
  cylinder supply pressure (0.1 MPa or more)
- Ambient and fluid temperatures: Refer to the catalogue on the
  SMC website for details
- Applicable tubing material: Use caution at the max. operating
  pressure when using soft nylon or polyurethane tubing

Product Usage Instructions

Mounting Instructions

The AKP Series Pilot Check Valve can be easily mounted using a
hexagon wrench.

Functionality

The Pilot Check Valve allows for residual pressure release,
temporary intermediate stops, and precise intermediate stops (not
guaranteed).

Variations and Selection

The AKP Series offers vertical and horizontal types that can be
selected based on installation conditions.

Tubing and Port Sizes

Ensure proper compatibility by selecting the correct pilot port
size, valve side, and cylinder side based on the applicable tubing
O.D. and metric or inch size.

FAQ

Q: What should I do before handling the products?

A: Be sure to read the caution section in the manual and refer
to the back cover for safety instructions. For further precautions,
check the Handling Precautions for SMC Products and the Operation
Manual on the SMC website.

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Model with Residual Pressure Release Function

Pilot Check Valve

New

Compact Type

RoHS

Model with Residual Pressure Release Function
1 21

2
Residual pressure exhaust button

Exhaust port

Cylinder pressure can be manually released.

Model without Residual Pressure Release Function

Temporary intermediate stops are possible.1
1 Precise intermediate stops are not guaranteed.

Variations
Pilot port Horizontal

Elbow Valve side
Cylinder side

Vertical

Pilot port Valve side

Cylinder side

AKP Series

Universal

Port size

Pilot port size

Applicable tubing O.D.

Metric size

Inch size

M5, 10-32UNF 1/8, 1/4,
3/8, 1/2 (R, NPT, G)

4, 6, 8 10, 12

5/32″ 1/4″ 5/16″

M5,

10-32UNF 1/8, 1/4

4, 6, 8 10, 12

—

3/8, 1/2

(G)

CAT.EUS20-274Aa-UK

Model with Residual Pressure Release Function Pilot Check Valve Compact Type AKP Series

Vertical and horizontal types are available, which can

be selected depending on the installation conditions.

Width 14.2 mm

Height
15.1 mm

Horizontal Elbow type AKP-LB-G01

Vertical Elbow type AKP-LA-G01

Improved piping design flexibility (360°-rotation type)

Easily mounted using a hexagon wrench

Pilot Check Valve Variations by Function

Series
Compact Type AKP
Compact Type ASP
Metal Body Type AS-X785
1

Pilot check valve

Pilot check valve +
Residual pressure release valve

Pilot check valve +
Speed controller

Pilot check valve
+ Speed controller
+ Residual pressure release valve

—

Page
p. 2

—

https://www.smc.eu

—

https://www.smc.eu

Model with Residual Pressure Release Function

Pilot Check Valve Compact Type

AKP Series

RoHS

Pilot port Valve side

Cylinder side

Pilot port

Valve side

Cylinder side

Symbol

1 21 21

2
Model with residual pressure release function

Model without residual pressure release function

Caution
Be sure to read this before handling the products. Refer to the back cover for safety instructions. For flow control equipment precautions, refer to the “Handling Precautions for SMC Products” and the “Operation Manual” on the SMC website: https://www.smc.eu

Model

Vertical type

Port size

Pilot port size

M5 x 0.8

Ø 4

10-32UNF

G1/8

Ø 6

G1/4

Ø 8

—

G3/8

Ø 10

—

G1/2

Ø 12

—

Horizontal type

Port size

Pilot port size

M5 x 0.8

Ø 4

10-32UNF

NPT 1/8

Ø 6

—

NPT 1/4

Ø 8

—

NPT 3/8

Ø 10

—

NPT 1/2

Ø 12

—

Specifications

Applicable tubing O.D.

Metric size

Inch size

12 5/32″ 1/4″ 5/16″

—

Applicable tubing O.D.

Metric size

Inch size

12 5/32″ 1/4″ 5/16″

—

Fluid Proof pressure Max. operating pressure Min. operating pressure Pilot check valve operating pressure Ambient and fluid temperatures Applicable tubing material

Air 1.05 MPa 0.7 MPa 0.1 MPa
50 % or more of the cylinder supply pressure (0.1 MPa or more)1
-5 to 60 °C (No freezing) Nylon, Soft nylon, Polyurethane, FEP, PFA

Use caution at the max. operating pressure when using soft nylon or polyurethane tubing. (Refer to the catalogue on https://www.smc.eu for details.)
1 0.15 MPa or more for the AKP–M5/U10

Flow Rate and Sonic Conductance

Model

AKP–M5/U10 AKP–01 AKP–02 AKP–03 AKP–04

Tubing O.D.

Metric size

Ø 4 Ø 6

Ø 4

Ø 6 Ø 8

Ø 6

Ø 8 Ø 10 Ø 12

Inch size

— Ø 5/32″ Ø 1/4″ Ø 1/4″ Ø 5/16″ —

—

C values: Sonic Free flow

0.3

0.51 0.68 1.17 1.29 2.5

4.15

conductance

dm3/(s·bar) Controlled flow 0.3

0.51 0.68 1.17 1.29 2.5

4.15

b values: Critical Free flow 0.35 0.35 0.25 0.45 0.45 0.2

0.3

pressure ratio Controlled flow 0.35 0.40 0.25 0.40 0.40 0.25 0.3

Q [l/min (ANR)]1 Free flow

Controlled flow 79

134 168 330 364 599 1055 139 168 318 351 616 1055

1 These values have been calculated according to ISO 6358 and indicate the flow rate under standard conditions with an inlet pressure of 0.6 MPa (relative pressure) and a pressure drop of 0.1 MPa.
2

AKP Series
How to Order
Vertical
Vertical type AKP L A 04 E G 01

Horizontal type AKP L B 04 E

01 S

Type

Elbow

U Universal

Horizontal

Applicable tubing O.D.1

Metric size

Inch size2

04 Ø 4

03 Ø 5/32″

06 Ø 6

07 Ø 1/4″

08 Ø 8

09 Ø 5/16″

10 Ø 10

12 Ø 12

1 For selecting applicable tubing O.D., refer to the “Model” on page 2.
2 Only the metric size is available for the G thread type.

Residual pressure

release function

— Without

With

Seal method

— Without sealant

With sealant

For port sizes M5 and U10 and thread type “G,” select the type without sealant (–).

Port size

M51 M5 x 0.8

U101 10-32UNF

1/8

1/4

3/8

1/2

1 Use the M5 or U10 port size model in a circuit that uses an exhaust centre valve. These sizes cannot be used in a circuit that uses a closed centre valve only because the responsiveness of the intermediate stop of the actuator may be slow. Therefore, if you want to use those models in a circuit with a closed centre valve only, contact us.

Thread type

—

NPT

Select (R: –) for connection thread port size M5 or U10.

AKP Series Model with Residual Pressure Release Function
Pilot Check Valve Compact Type

Construction
Vertical Elbow type Seal method: Gasket seal For M5, 10-32UNF
r w

Model without residual pressure release function
!0
Model with residual pressure release function
Horizontal Elbow type Seal method: Gasket seal For M5, 10-32UNF
!0

#0 #1

Model with residual

pressure release function

Vertical Universal type
Seal method: Gasket seal For M5, 10-32UNF

q @4 t @0 i u @5 e

@3 @9 !1

y !9 !8 Model without residual !7 pressure release function !2 @6

Model with residual pressure release function

Horizontal Universal type
Seal method: Gasket seal For M5, 10-32UNF

y !5 !3 !4 @2 @8 !0 @3

#0 e

@4 r

@1 !9 !8 !7 !2 @6 @9 !1 @7 o
Model with residual pressure release function
w

Model without residual pressure release function

Component Parts

No.

Description

1 Pilot body

2 Piston A

3 Piston B

4 End cover A

5 End cover B

6 Piston rod

7 Push rod

8 Push rod cover

9 End body

10 Body A

11 Body B

12 Elbow body

13 Exhaust ring

14 Seal retainer

15 Spring

Material PBT Brass Brass Brass Brass Brass
Aluminium alloy PBT PBT PBT Brass PBT POM Brass
Stainless steel

Note Electroless nickel plating Electroless nickel plating Electroless nickel plating Electroless nickel plating Electroless nickel plating
Electroless nickel plating
Electroless nickel plating

Model without residual pressure release function

No.

Description

16 Stud

17 Spacer

18 Cassette seal

19 Cassette

20 Seal

21 Seal

22 Seal

23 U-seal

24 O-ring

25 O-ring

26 O-ring

27 O-ring

28 O-ring

29 O-ring

30 O-ring

31 Gasket

Material

Note

Brass

Electroless nickel plating

POM/PBT

NBR

—

NBR

NBR/Stainless steel

3-1

AKP Series

Construction Horizontal Elbow type
Seal method: Sealant For R, NPT
!0

Model with residual pressure release function

Model without residual pressure release function

Horizontal Universal type
Seal method: Sealant For R, NPT

@2 e y !4 @7 !0 !1 !6

!5 @6 o

!9 !8 !2 @5 !3

Model with residual

pressure release function

Model without residual pressure release function

Component Parts

No.

Description

1 Pilot body

2 Piston A

3 Piston B

4 End cover A

5 End cover B

6 Piston rod

7 Push rod

8 Push rod cover

9 End body

10 Body A

11 Body B

12 Elbow body

13 Valve

14 Spring

15 Spring

Material PBT Brass Brass Brass Brass Brass
Aluminium alloy PBT PBT PBT Brass PBT NBR
Stainless steel Stainless steel

Note Electroless nickel plating Electroless nickel plating Electroless nickel plating Electroless nickel plating Electroless nickel plating
Electroless nickel plating

No.

Description

16 Guide

17 Stud

18 Spacer

19 Cassette seal

20 Cassette

21 Seal

22 Seal

23 O-ring

24 O-ring

25 O-ring

26 O-ring

27 O-ring

28 O-ring

29 Seal ring

Material Brass Brass POM/PBT NBR
— NBR NBR NBR NBR NBR NBR NBR NBR NBR

Note Electroless nickel plating Electroless nickel plating

AKP Series Model with Residual Pressure Release Function
Pilot Check Valve Compact Type

Construction
Vertical Elbow type Seal method: Face seal For G
r w

Model without residual pressure release function

!0
Model with residual pressure release function
Horizontal Elbow type Seal method: Face seal For G
!0

@8 !7

Model with residual

pressure release function

Vertical Universal type
Seal method: Face seal For G

q @1 i u t e @5 @4

!4 !0

!6 !1

Model with residual pressure release function

!9
!8 Model without residual !2 pressure release function @6

Horizontal Universal type
Seal method: Face seal For G

@2 e y !4 @7 !0 !1

t @4

!5 @6 o

!9 !8 !2 @5 !3

Model with residual

pressure release function

Model without residual pressure release function

AKP Series

Dimensions Horizontal Elbow type
Seal method: Gasket seal For M5, 10-32UNF
Ø D2 Applicable tubing O.D. Ø d1

Ø D4 H3

Residual pressure exhaust button Ø D1

L3 L4 Ø D3

Applicable tubing O.D. Ø d2

Model with residual pressure release function

Model without residual pressure release function

L5 L6 M1

T T

Metric Size
Model
AKP-LB04E-M5 AKP-LB06E-M5 AKP-LB04-M5 AKP-LB06-M5 AKP-LB04E-U10 AKP-LB06E-U10 AKP-LB04-U10 AKP-LB06-U10

T (R, NPT)

4 4 4 4

4 6 4 6

2.9 M5 x 0.8
—

4 4 4 4

4 6 4 6

10/32UNF

2.9 —

(Width across flats)

[mm]

L9 (Width across flats)

Weight [g]

9.3 9.3 12.8 53.9 48.6 38.1 17.8 25.0 18.6 23.8 17.4 2.5 17.1 13.7 8.1 12.7 12.7 21

9.3 11.6 12.8 53.9 48.6 38.1 17.3 25.0 18.6 24.9 18.5 2.5 17.1 13.7 8.1 12.7 13.5 21

9.3 9.3 12.8 52.8 47.5 38.1 17.8 25.0 18.6 23.8 17.4 2.5 17.1 13.7 8.1 12.7 12.7 21

9.3 11.6 12.8 52.8 47.5 38.1 17.3 25.0 18.6 24.9 18.5 2.5 17.1 13.7 8.1 12.7 13.5 22

9.3 9.3 12.8 53.9 48.6 38.1 17.8 25.0 18.6 23.8 17.4 2.5 17.1 13.7 8.1 12.7 12.7 20

9.3 11.6 12.8 53.9 48.6 38.1 17.3 25.0 18.6 24.9 18.5 2.5 17.1 13.7 8.1 12.7 13.5 20

9.3 9.3 12.8 52.8 47.5 38.1 17.8 25.0 18.6 23.8 17.4 2.5 17.1 13.7 8.1 12.7 12.7 20

9.3 11.6 12.8 52.8 47.5 38.1 17.3 25.0 18.6 24.9 18.5 2.5 17.1 13.7 8.1 12.7 13.5 21

Horizontal Universal type
Seal method: Gasket seal For M5, 10-32UNF

Ø D5 H3

Applicable tubing O.D. Ø d1

L1 L2
L3 Ø D2

H2 H1

Residual pressure exhaust button Ø D1

Model with residual pressure release function
Model without residual pressure release function

L6 L8 L7
M1

Applicable tubing O.D. Ø d2

Ø D3

M2 L5
L4

Ø D4

L9
(Width across flats)

Metric Size
Model
AKP-UB04E-M5 AKP-UB06E-M5 AKP-UB04-M5 AKP-UB06-M5 AKP-UB04E-U10 AKP-UB06E-U10 AKP-UB04-U10 AKP-UB06-U10
5-1

d1 d2 T D1

4 4 4 4

4 6 4 6

2.9 M5 x 0.8
—

4 4 4 4

4 6 4 6

2.9 10/32UNF
—

D2 D3
9.3 9.3 9.3 11.6 9.3 9.3 9.3 11.6 9.3 9.3 9.3 11.6 9.3 9.3 9.3 11.6

L9 (Width across flats)

9.3 12.8 53.9 48.6 38.1 31.8 17.5 35.7 18.6 12.5 2.5 17.1 13.7

9.3 12.8 53.9 48.6 38.1 31.8 21.0 36.9 18.6 12.5 2.5 17.1 13.7

9.3 12.8 52.8 47.5 38.1 30.7 17.5 35.7 18.6 12.5 2.5 17.1 13.7

9.3 12.8 52.8 47.5 38.1 30.7 21.0 36.9 18.6 12.5 2.5 17.1 13.7

9.3 12.8 53.9 48.6 38.1 31.8 17.5 35.7 18.6 12.5 2.5 17.1 13.7

9.3 12.8 53.9 48.6 38.1 31.8 21.0 36.9 18.6 12.5 2.5 17.1 13.7

9.3 12.8 52.8 47.5 38.1 30.7 17.5 35.7 18.6 12.5 2.5 17.1 13.7

9.3 12.8 52.8 47.5 38.1 30.7 21.0 36.9 18.6 12.5 2.5 17.1 13.7

[mm]

Weight [g]

8.1 12.7 12.7 21

8.1 12.7 13.5 22

8.1 12.7 12.7 22

8.1 12.7 13.5 23

8.1 12.7 12.7 21

8.1 12.7 13.5 21

8.1 12.7 12.7 21

8.1 12.7 13.5 22

AKP Series Model with Residual Pressure Release Function
Pilot Check Valve Compact Type

Dimensions
Vertical Elbow type Seal method: Gasket seal For M5, 10-32UNF
Applicable tubing O.D. Ø d1

L1 L2 M1

Model with

Model without

residual pressure residual pressure

release function release function

Ø D2

H2 H1

H4 H3

Ø D3

Applicable tubing O.D. Ø d2

L5 Ø D4 (Width across flats)

Residual pressure exhaust button Ø D1

Metric Size

Model

d1 d2 T

AKP-LA04E-M5 AKP-LA06E-M5 AKP-LA04-M5 AKP-LA06-M5

4 4 4 4

6 4

M5 x 0.8

2.9 —

AKP-LA04E-U10 AKP-LA06E-U10 AKP-LA04-U10 AKP-LA06-U10

4 4 4 4

6 4

10/32UNF

2.9 —

[mm]

L5 (Width across flats)

Weight [g]

9.3 9.3 12.8 25.0 18.6 23.8 17.4

43.0 39.6 12.2 32.5 12.7 12.7 17

9.3 11.6 12.8 25.0 18.6 24.9 18.5

43.0 39.6 11.7 32.5 12.7 13.5 17

9.3 9.3 12.8 25.0 18.6 23.8 17.4

41.9 38.5 12.2 32.5 12.7 12.7 17

9.3 11.6 12.8 25.0 18.6 24.9 18.5

41.9 38.5 11.7 32.5 12.7 13.5 18

9.3 9.3 12.8 25.0 18.6 23.8 17.4

43.0 39.6 12.2 32.5 12.7 12.7 17

9.3 11.6 12.8 25.0 18.6 24.9 18.5

43.0 39.6 11.7 32.5 12.7 13.5 17

9.3 9.3 12.8 25.0 18.6 23.8 17.4

41.9 38.5 12.2 32.5 12.7 12.7 17

9.3 11.6 12.8 25.0 18.6 24.9 18.5

41.9 38.5 11.7 32.5 12.7 13.5 18

Vertical Universal type
Seal method: Gasket seal For M5, 10-32UNF
Ø D3 Applicable tubing O.D. Ø d2

L1 L3

L2 M1

Applicable tubing O.D. Ø d1

Model with

Model without

residual pressure residual pressure

release function release function

Ø D4 Ø D2 H3 H2 H1 H4 H5 M2

Ø D5 (Width across flats)

Residual pressure exhaust button Ø D1

Metric Size

Model

d1 d2 T D1

AKP-UA04E-M5 AKP-UA06E-M5 AKP-UA04-M5 AKP-UA06-M5

4 4 4 4

6 4

M5 x 0.8

2.9 —

AKP-UA04E-U10 AKP-UA06E-U10 AKP-UA04-U10 AKP-UA06-U10

4 4 4 4

4 6 4 6

10/32UNF

2.9 —

[mm]

L4 (Width across flats)

Weight [g]

9.3 9.3 9.3 12.8 35.7 18.6 12.5

43.0 39.6 32.5 31.8 17.5 12.7 12.7 18

9.3 11.6 9.3 12.8 36.9 18.6 12.5

43.0 39.6 32.5 31.8 21.0 12.7 13.5 18

9.3 9.3 9.3 12.8 35.7 18.6 12.5

41.9 38.5 32.5 30.7 17.5 12.7 12.7 18

9.3 11.6 9.3 12.8 36.9 18.6 12.5

41.9 38.5 32.5 30.7 21.0 12.7 13.5 19

9.3 9.3 9.3 12.8 35.7 18.6 12.5

43.0 39.6 32.5 31.8 17.5 12.7 12.7 18

9.3 11.6 9.3 12.8 36.9 18.6 12.5

43.0 39.6 32.5 31.8 21.0 12.7 13.5 18

9.3 9.3 9.3 12.8 35.7 18.6 12.5

41.9 38.5 32.5 30.7 17.5 12.7 12.7 18

9.3 11.6 9.3 12.8 36.9 18.6 12.5

41.9 38.5 32.5 30.7 21.0 12.7 13.5 19

5-2

AKP Series
Dimensions Horizontal Elbow type
Seal method: Sealant For R, NPT

Model with residual pressure release function
Residual pressure exhaust button Ø D1

Model without residual pressure release function

Ø D4 H3

Ø D2 Applicable tubing O.D. Ø d1

L3 L4 Ø D3

T Applicable tubing O.D. Ø d2

L5 L6 M1

L2 L1

L9
(Width across flats)

Metric Size

[mm]

Model

AKP-LB04E-01(S)

AKP-LB06E-01(S) 6

AKP-LB08E-01(S)

AKP-LB06E-02(S) AKP-LB08E-02(S)

AKP-LB10E-03(S) 10

AKP-LB12E-04(S) 12

AKP-LB10E-N03(S) 10

AKP-LB12E-N04(S) 12

AKP-LB04-01(S)

AKP-LB06-01(S) 6

AKP-LB08-01(S)

AKP-LB06-02(S) AKP-LB08-02(S)

AKP-LB10-03(S) 10

AKP-LB12-04(S) 12

AKP-LB10-N03(S) 10

AKP-LB12-N04(S) 12

T (R,NPT)

6 R1/8

2.9

6 8

R1/4

10 12

R3/8 R1/2

2.9

10 12

NPT3/8 NPT1/2

2.9

6 R1/8

—

6 8

R1/4

10 R3/8 12 R1/2

—

10 NPT3/8 12 NPT1/2

—

D2 D3

9.3

11.6 11.6

15.2

12.8 15.2

18.5 18.5

21.7 21.7

18.5 18.5

21.7 21.7

9.3

11.6 11.6

15.2

12.8 15.2

18.5 18.5

21.7 21.7

18.5 18.5

21.7 21.7

D4 L1
14.2 56.4
18.5 65.5 23.0 77.6 28.6 93.6 23.0 77.6 28.6 93.6
14.2 55.3
18.5 64.6 23.0 76.6 28.6 92.6 23.0 76.6 28.6 92.6

L9 (Width across flats)

27.5 20.4

49.4 38.9 20.7 27.9 20.8 27.9 20.8

6 20.0 16.9

32.4 25.3

56.8

46.7

26.8

36.5

27.2

34.8 36.5

25.5 27.2

8 30.0 25.3

67.1 56.5 33.0 43.4 31.9 43.4 31.9 10 37.7 32.6

80.8 69.4 38.6 49.6 35.3 49.6 35.3 10 45.2 38.8

67.1 56.5 33.0 43.4 31.9 43.4 31.9 9.525 37.4 32.7

80.8 69.4 38.6 49.6 35.3 49.6 35.3 9.525 44.6 38.2

27.5 20.4

48.3 38.9 20.7 27.9 20.8 27.9 20.8

6 20.0 16.9

32.4 25.3

55.9

46.7

26.8

36.5

27.2

34.8 36.5

25.5 27.2

8 30.0 25.3

66.1 56.5 33.0 43.4 31.9 43.4 31.9 10 37.7 32.6

79.8 69.4 38.6 49.6 35.3 49.6 35.3 10 45.2 38.8

66.1 56.5 33.0 43.4 31.9 43.4 31.9 9.525 37.4 32.7

79.8 69.4 38.6 49.6 35.3 49.6 35.3 9.525 44.6 38.2

Weight [g]

12.7 35

9.5 13.9 13.9 35

18.7 37

14.8

18.7

17.1 18.7

73 75

18.6 21.0 21.0 132

22.8 22.0 22.0 239

20.2 21.0 21.0 133

23.7 22.0 22.0 238

12.7 35

9.5 13.9 13.9 35

18.7 37

14.8

18.7

17.1 18.7

74 76

18.6 21.0 21.0 133

22.8 22.0 22.0 240

20.2 21.0 21.0 133

23.7 22.0 22.0 238

Inch Size

[mm]

Model

T (R,NPT)

AKP-LB03E-N01(S) AKP-LB07E-N01(S) AKP-LB07E-N02(S) AKP-LB09E-N02(S)

6 8

5/32″ 1/4″

NPT1/8

1/4″ 5/16″

NPT1/4

2.9

AKP-LB03-N01(S) AKP-LB07-N01(S) AKP-LB07-N02(S) AKP-LB09-N02(S)

6 8

5/32″ 1/4″

NPT1/8

1/4″ 5/16″

NPT1/4

—

D2 D3
11.6 9.3 13.2
15.2 15.2 11.6 9.3
13.2 15.2 15.2

D4 L1 14.2 56.4 18.5 65.5 14.2 55.3 18.5 64.6

L9 (Width across flats)

49.4

38.9

20.7

27.9

20.8

27.5 31.3

20.4 24.2

5.56

20.0 16.8

56.8

46.7

26.8

36.5

27.2

34.8 36.5

25.5 27.2

7.94

30.3 25.9

48.3

38.9

20.7

27.9

20.8

27.5 31.3

20.4 24.4

5.56

20.0 16.8

55.9

46.7

26.8

36.5

27.2

34.8 36.5

25.5 27.2

7.94

30.3 25.9

Weight [g]

9.4 13.9 12.7 17.1
16.4 18.7 18.7

35 35 74 76

9.4 13.9 12.7 17.1
16.4 18.7 18.7

36 36 75 77

AKP Series Model with Residual Pressure Release Function
Pilot Check Valve Compact Type

Dimensions
Horizontal Universal type Seal method: Sealant For R, NPT

Ø D5 H3

Applicable tubing O.D. Ø d1

L1 L2
L3 Ø D2

H2 H1

Model with residual pressure release function

Residual pressure exhaust button Ø D1

Model without residual pressure release function

L7 M1

L6 L8

Applicable tubing O.D. Ø d2

Ø D3

M2 L5
L4

Ø D4

L9 (Width across flats)

Metric Size

[mm]

Model

d1 d2

D1 D2

L9 (Width across flats)

Weight [g]

AKP-UB04E-01(S)

AKP-UB06E-01(S) 6 6 R1/8

11.6

9.3 11.6

9.3 11.1

14.2

56.4

49.4

38.9

28.7

17.5 23.2

38.6 40.6

20.8

13.1 14.0

12.9 36 6 20.0 16.9 9.5 13.9 14.1 36

AKP-UB08E-01(S)

2.9

15.2

29.5 28.2 44.6

16.2

18.7 39

AKP-UB06E-02(S) AKP-UB08E-02(S)

6 8

R1/4

15.2

12.8 15.2

12.9

18.5

65.5

56.8

46.7

30.8

25.5 28.2

52.0 53.2

27.2

18.4

30.0

25.3

14.8

18.7

17.1 18.7

75 78

AKP-UB10E-03(S) 10 AKP-UB12E-04(S) 12

10 12

R3/8 R1/2

2.9

18.5 21.7

16.2 19.4

23 28.6

77.6 93.6

67.1 80.8

56.5 69.4

34.1 42.2

32.7 36.4

64.4 73.2

31.9 35.3

23.2 27.0

10 10

37.7 32.6 18.6 21.0 21.0 138 45.2 38.8 22.8 22.0 22.0 247

AKP-UB10E-N03(S) 10 AKP-UB12E-N04(S) 12

10 12

NPT3/8 NPT1/2

2.9

18.5 21.7

16.2 19.4

23 28.6

77.6 93.6

67.1 80.8

56.5 69.4

34.1 42.2

32.7 36.4

64.4 73.2

31.9 35.3

23.2 27.0

9.525 9.525

37.4 32.7 20.2 21.0 21.0 138 44.6 38.2 23.7 22.0 22.0 245

AKP-UB04-01(S)

AKP-UB06-01(S) 6 6 R1/8

11.6

9.3 11.6

9.3 11.1

14.2

55.3

48.3

38.9

27.6

17.5 23.2

38.6 40.6

20.8

13.1 14.0

12.9 37 6 20.0 16.9 9.5 13.9 14.1 37

AKP-UB08-01(S)

—

15.2

28.4 28.2 44.6

16.2

18.7 40

AKP-UB06-02(S) AKP-UB08-02(S)

6 8

R1/4

15.2

12.8 15.2

12.9

18.5

64.6

55.9

46.7

29.9

25.5 28.2

52.0 53.2

27.2

18.4

30.0

25.3

14.8

18.7

17.1 18.7

76 79

AKP-UB10-03(S) AKP-UB12-04(S)

10 12

R3/8 R1/2

—

18.5 21.7

16.2 19.4

23 28.6

76.6 92.6

66.1 79.8

56.5 69.4

33.1 41.2

32.7 36.4

64.4 73.2

31.9 35.3

23.2 27.0

10 10

37.7 32.6 18.6 21.0 21.0 138 45.2 38.8 22.8 22.0 22.0 247

AKP-UB10-N03(S) 10 AKP-UB12-N04(S) 12

10 12

NPT3/8 NPT1/2

—

18.5 18.5 16.2 23 76.6 66.1 56.5 33.1 32.7 64.4 31.9 23.2 21.7 21.7 19.4 28.6 92.6 79.8 69.4 41.2 36.4 73.2 35.3 27.0

9.525 9.525

37.4 32.7 20.2 21.0 21.0 139 44.6 38.2 23.7 22.0 22.0 246

Inch Size

[mm]

Model

d1 d2

D1 D2

L9 (Width across flats)

Weight [g]

AKP-UB03E-N01(S) AKP-UB07E-N01(S) AKP-UB07E-N02(S) AKP-UB09E-N02(S)

6 8

5/32″ 1/4″

NPT1/8

1/4″ 5/16″

NPT1/4

2.9

11.6 15.2

9.3 13.2 15.2

9.3 12.9

14.2 18.5

56.4 65.5

49.4 56.8

38.9 46.7

28.7 29.5
30.8

17.5 25.9 28.2

38.6 43.6 52.2 53.2

20.8

13.1 16.2

27.2 18.4

5.56 7.94

20.0 30.3

16.8 25.9

9.4 16.4

13.9 18.7

12.9 17.1 18.7

37 37 76 79

AKP-UB03-N01(S) AKP-UB07-N01(S) AKP-UB07-N02(S) AKP-UB09-N02(S)

6 8

5/32″ 1/4″

NPT1/8

1/4″ 5/16″

NPT1/4

—

11.6 15.2

9.3 13.2 15.2

9.3 12.9

14.2 18.5

55.3 64.6

48.3 55.9

38.9 46.7

27.6 28.4
29.9

17.5 25.9 28.2

38.6 43.6 52.2 53.2

20.8

13.1 16.2

27.2 18.4

5.56 7.94

20.0 30.3

16.8 25.9

9.4 16.4

13.9 18.7

12.9 17.1 18.7

37 37 76 80

AKP Series
Dimensions Horizontal Elbow type
Seal method: Face seal For G
Ø D2 Applicable tubing O.D. Ø d1

Ø D4 H3

Residual pressure exhaust button Ø D1

L3 L4 Ø D3

Applicable tubing O.D. Ø d2

Model with residual pressure release function
Model without residual pressure release function

L5 L6 M1

T T

Metric Size
Model
AKP-LB04E-G01 AKP-LB06E-G01 AKP-LB08E-G01 AKP-LB06E-G02 AKP-LB08E-G02 AKP-LB10E-G03 AKP-LB12E-G04 AKP-LB04-G01 AKP-LB06-G01 AKP-LB08-G01 AKP-LB06-G02 AKP-LB08-G02 AKP-LB10-G03 AKP-LB12-G04

(Width across flats)

T (R, NPT)

9.3

27.5

6 6 G1/8

11.6 11.6 14.2 56.4 49.4 38.9 20.7 27.9 20.8 27.9

2.9

15.2

32.4

6 8

G1/4

15.2

12.8 15.2

18.5

65.5

56.8

46.7

26.8

36.5

27.2

34.8 36.5

10 10 12 12

G3/8 G1/2

2.9

18.5 21.7

23.0 28.6

77.6 93.6

67.1 80.8

56.5 69.4

33.0 38.6

43.4 49.6

31.9 35.3

43.4 49.6

9.3

27.5

6 6 G1/8

11.6 11.6 14.2 55.3 48.3 38.9 20.7 27.9 20.8 27.9

—

15.2

32.4

6 8

G1/4

15.2

12.8 15.2

18.5

64.6

55.9

46.7

26.8

36.5

27.2

34.8 36.5

10 10 12 12

G3/8 G1/2

—

18.5 21.7

23.0 28.6

76.6 92.6

66.1 79.8

56.5 69.4

33.0 38.6

43.4 49.6

31.9 35.3

43.4 49.6

L9 (Width across flats)

20.4

20.8

20.6 15.1 8.3 13.9

25.3

25.5 27.2

27.8 21.3 11.8 18.7

31.9

34.8 27.3 14.8 21.0

35.3

41.0 32.0 17.5 22.0

20.4

20.8

20.6 15.1 8.3 13.9

25.3

25.5 27.2

27.8 21.3 11.8 18.7

31.9

34.8 27.3 14.8 21.0

35.3

41.0 32.0 17.5 22.0

[mm]

Weight [g]

12.7 35

13.9 35

18.7 37

17.1 71

18.7 73

21.0 128

22.0 229

12.7 35

13.9 35

18.7 37

17.1 72

18.7 74

21.0 128

22.0 230

Horizontal Universal type
Seal method: Face seal For G

Ø D5 H3

Applicable tubing O.D. Ø d1

L1 L2
L3 Ø D2

H2 H1

Residual pressure exhaust button Ø D1
Model with residual pressure release function
Model without residual pressure release function

L6 L8 L7
M1

Ø D3

Applicable tubing O.D. Ø d2

Metric Size

L9
(Width across flats) Ø D4

[mm]

Model
AKP-UB04E-G01 AKP-UB06E-G01 AKP-UB08E-G01 AKP-UB06E-G02 AKP-UB08E-G02 AKP-UB10E-G03 AKP-UB12E-G04 AKP-UB04-G01 AKP-UB06-G01 AKP-UB08-G01 AKP-UB06-G02 AKP-UB08-G02 AKP-UB10-G03 AKP-UB12-G04
8

d1 d2

6 8

10 10

12 12

6 8

10 10

12 12

D1 D2

L9 (Width across flats)

Weight [g]

G1/8

11.6

9.3 11.6

9.3 11.1

14.2

56.4

49.4

38.9

28.7

17.5 23.2

38.6 40.6

20.8

13.1 14.0

12.9 36

20.6 15.1 8.3 13.9 14.1 36

2.9

15.2

29.5 28.2 44.6

16.2

18.7 39

G1/4

15.2

12.8 15.2

12.9

18.5

65.5

56.8

46.7

30.8

25.5 28.2

52.0 53.2

27.2

18.4

27.8

21.3

11.8

18.7

17.1 18.7

73 76

G3/8 G1/2

2.9

18.5 21.7

16.2 19.4

23 28.6

77.6 93.6

67.1 80.8

56.5 69.4

34.1 42.2

32.7 36.4

64.4 73.2

31.9 35.3

23.2 27.0

10 10

34.8 27.3 14.8 21.0 21.0 133 41.0 32.0 17.5 22.0 22.0 237

G1/8

11.6

9.3 11.6

9.3 11.1

14.2

55.3

48.3

38.9

27.6

17.5 23.2

38.6 40.6

20.8

13.1 14.0

12.9 37

20.6 15.1 8.3 13.9 14.1 37

—

15.2

28.4 28.2 44.6

16.2

18.7 40

G1/4

15.2

12.8 15.2

12.9

18.5

64.6

55.9

46.7

29.9

25.5 28.2

52.0 53.2

27.2

18.4

27.8

21.3

11.8

18.7

17.1 18.7

73 76

G3/8 G1/2

—

18.5 18.5 16.2 21.7 21.7 19.4

23 76.6 66.1 28.6 92.6 79.8

56.5 33.1 32.7 64.4 31.9 69.4 41.2 36.4 73.2 35.3

23.2 27.0

10 10

34.8 27.3 14.8 21.0 21.0 133 41.0 32.0 17.5 22.0 22.0 237

AKP Series Model with Residual Pressure Release Function
Pilot Check Valve Compact Type

Dimensions
Vertical Elbow type Seal method: Face seal Applicable tubing O.D. Ø d1 For G

L1 L2 M1

Ø D2

Model with

Model without

residual pressure residual pressure

release function release function

H2 H1

H4 H3

Ø D3

Applicable tubing O.D. Ø d2

L4 L3

L5 Ø D4 (Width across flats)

Metric Size

Residual pressure exhaust button Ø D1

[mm]

Model

d1 d2

D1 D2 D3

L5 (Width across flats)

H2 H3

Weight [g]

AKP-LA04E-G01

9.3

28.3 20.4

12.7 27

AKP-LA06E-G01 6 6 G1/8

11.6 11.6 14.2 28.6 20.8 28.6 20.8

44.0 38.5 15.2 33.5 13.9 13.9 27

AKP-LA08E-G01

2.9

15.2

33.2 25.3

18.7 29

AKP-LA06E-G02 AKP-LA08E-G02

6 8

G1/4

15.2

12.8 15.2

18.5

37.5

27.2

35.8 37.5

25.5 27.2

48.1

41.6

17.1

38.0

18.7

17.1 18.7

52 53

AKP-LA10E-G03 AKP-LA12E-G04

10 12

G3/8 G1/2

2.9

18.5 21.7

23 28.6

44.8 51.7

31.9 35.3

44.8 51.7

31.9 35.3

24 30

56.7 49.2 21.8 46.1 21.0 21.0 92 67.8 58.8 25.7 56.4 22.0 22.0 157

AKP-LA04-G01

9.3

28.3 20.4

12.7 27

AKP-LA06-G01 6 6 G1/8

11.6 11.6 14.2 28.6 20.8 28.6 20.8

42.9 37.4 15.2 33.5 13.9 13.9 27

AKP-LA08-G01

—

15.2

33.2 25.3

18.7 29

AKP-LA06-G02 AKP-LA08-G02

6 8

G1/4

15.2

12.8 15.2

18.5

37.5

27.2

35.8 37.5

25.5 27.2

47.2

40.7

17.1

38.0

18.7

17.1 18.7

50 52

AKP-LA10-G03 AKP-LA12-G04

10 12

G3/8 G1/2

—

18.5 18.5 23 44.8 31.9 44.8 31.9 21.7 21.7 28.6 51.7 35.3 51.7 35.3

24 30

55.7 48.2 21.8 46.1 21.0 21.0 93 66.8 57.8 25.7 56.4 22.0 22.0 158

Vertical Universal type
Seal method: Face seal For G
Ø D3 Applicable tubing O.D. Ø d2

L1 L3

L2 M1

Applicable tubing O.D. Ø d1

Model with

Model without

residual pressure residual pressure

release function release function

Ø D4 Ø D2 H3 H2 H1 H4 H5 M2

Ø D5 (Width across flats)

Metric Size

Residual pressure exhaust button Ø D1

[mm]

Model

d1 d2

D1 D2

L4 (Width across flats)

Weight [g]

AKP-UA04E-G01

AKP-UA06E-G01 6 6 G1/8

9.3 9.3

38.6

13.1

11.6 11.6 11.1 14.2 40.6 20.8 14.0

44.0

38.5

33.5

28.8

17.5 23.2

13.9

12.9 14.1

28 28

AKP-UA08E-G01

2.9

15.2

44.6

16.2

28.0 28.2

18.7 31

AKP-UA06E-G02 AKP-UA08E-G02

6 8

G1/4

15.2

12.8 15.2

12.9

18.5

52.0 53.2

27.2

18.4

48.1

41.6

38.0

30.2

25.5 28.2

18.7

17.1 18.7

51 54

AKP-UA10E-G03 AKP-UA12E-G04

10 12

G3/8 G1/2

2.9

18.5 18.5 16.2 23 64.4 31.9 23.2 21.7 21.7 19.4 28.6 73.2 35.3 27.0

24 30

56.7 49.2 46.1 34.9 32.7 21.0 21.0 98 67.8 58.8 56.4 42.1 36.4 22.0 22.0 165

AKP-UA04-G01 AKP-UA06-G01

4 6 6 G1/8

9.3 9.3

38.6

13.1

11.6 11.6 11.1 14.2 40.6 20.8 14.0

42.9

37.4

33.5

27.7

17.5 23.2

13.9

12.9 14.1

29 29

AKP-UA08-G01

—

15.2

44.6

16.2

26.9 28.2

18.7 32

AKP-UA06-G02 AKP-UA08-G02

6 8

G1/4

15.2

12.8 15.2

12.9

18.5

52.0 53.2

27.2

18.4

47.2

40.7

38.0

29.3

25.5 28.2

18.7

17.1 18.7

51 54

AKP-UA10-G03 AKP-UA12-G04

10 12

G3/8 G1/2

—

18.5 18.5 16.2 23 64.4 31.9 23.2 21.7 21.7 19.4 28.6 73.2 35.3 27.0

24 30

55.7 48.2 46.1 33.9 32.7 21.0 21.0 98 66.8 57.8 56.4 41.1 36.4 22.0 22.0 166

AKP Series
Specific Product Precautions 1
Be sure to read this before handling the products. Refer to the back cover for safety instructions. For flow control equipment precautions, refer to the “Handling Precautions for SMC Products” and the “Operation Manual” on the SMC website: https://www.smc.eu

Design

Warning
1. Confirm the specifications. The products in this catalogue are designed to be used in compressed air systems (including vacuum) only. Do not operate at pressures, temperatures, etc., beyond the range of specifications, as this can cause damage or malfunction. (Refer to the specifications.) Please contact SMC when using a fluid other than compressed air (including vacuum). We do not guarantee against any damage if the product is used outside of the specification range.
2. Do not disassemble the product or make any modifications, including additional machining. Doing so may cause human injury and/or an accident.
3. Sonic conductance (C) and critical pressure ratio (b) values for products are representative values.
4. Check if PTFE can be used in the application. PTFE powder (Polytetrafluoroethylene resin) is included in the seal material of the male thread type piping taper thread. Confirm that the use of it will not cause any adverse effects on the system. Please contact SMC if the Safety Data Sheet (SDS) is required.
5. The pilot check valve is a product aimed at the control of the actuator via a temporary intermediate stop. The pilot check valve is used for temporarily stopping the actuator. Until a pilot signal is input, the valve shuts off the flow path from 2 to 1 and the actuator stops. When a pilot signal is input, the flow path from 2 to 1 is opened. When the residual pressure exhaust button is operated, all flow paths (2 to 1, 21, and exhaust port) are opened.
Exhaust port 1 21
2

Residual pressure exhaust button (Ø 2.9)

Exhaust port

6. This product cannot be used for accurate and precise intermediate stops of the actuator. Due to the compressibility of air as a fluid, the actuator will continue to move until it reaches a position of pressure balance, even though the pilot check valve closes with an intermediate stop signal.

7. This product cannot be used to hold a stop position for an extended period of time. Pilot check valves and actuators are not guaranteed for zero air leakage. Therefore, it is sometimes not possible to hold a stop position for an extended period of time. In the event that holding for an extended time is necessary, a mechanical means for holding should be devised.
8. Pay attention to the residual pressure on the port 1 side when using the AKP–M5 or the AKP–U10. If there is residual pressure on the port 1 side, the responsiveness of the intermediate stop of the actuator may be slow. For the AKP–M5 or the AKP–U10, use a circuit with an exhaust centre valve to prevent residual pressure from being produced on the port 1 side.
9. Pay attention to the residual pressure within the actuator at the time of intermediate stop. When the actuator is stopped at the intermediate position by this product, there may be pressure contained inside the actuator, therefore the actuator may suddenly move when the residual pressure is released. Before operating the residual pressure exhaust button, confirm that the surrounding area is secure from any potential hazards or accidents occurring.
10. Use this product after checking the surrounding areas in advance before the release of residual pressure. The actuator may move at a speed quicker than the intended speed from the original circuit set up when exhausting from the residual pressure release. Confirm this speed will not create additional hazards and pay attention to the air discharged from the exhaust port.
11. Pay attention to the motion of the actuator at the time of release of the residual pressure. When operating the residual pressure exhaust button or conducting maintenance or inspection, the actuator may start moving due to the residual pressure. Take appropriate measures in advance to prevent an actuator movement from posing a hazard. Also pay attention to the operation speed and the movement of the cylinder during exhaust. When an exhaust centre valve is used on the actuator supply side (Figure A on page 11), the residual pressure is released from port 1, 21, and the exhaust port. However, when using a closed centre valve like the example shown in Figure B on page 11, air is discharged only from port 21 and the exhaust port. Be sure to use an exhaust centre valve when using the AKP–M5 or the AKP–U10.

AKP Series
Specific Product Precautions 2
Be sure to read this before handling the products. Refer to the back cover for safety instructions. For flow control equipment precautions, refer to the “Handling Precautions for SMC Products” and the “Operation Manual” on the SMC website: https://www.smc.eu

Design

Warning
For the moving direction of the actuator against the corresponding exhaust side, refer to the figure below.

Move cylinder to retracted position.

Exhaust side

21 21

Exhaust side

Figure A: Example of piping using exhaust centre valve
Use the model “AKP–M5” or “AKP–U10” in a circuit that uses an exhaust centre valve.

Move cylinder to retracted position.
Exhaust side

21 21

Move cylinder to retracted position.
Exhaust side

Figure B: Example of piping using closed centre valve (Recommended example)
The model “AKP–M5” or “AKP–U10” cannot be used in a circuit that uses a closed centre valve only. If you want to use that model with a closed centre valve only, contact us.

12. Push the residual pressure exhaust button all the way to the end position by using a tool.

Push the residual pressure exhaust button all the way to the end position by using a tool having a tip diameter of Ø 2.8 or below. Refer to the table below for operating force and depth. Note that the higher the residual pressure, the greater the force required to operate the residual pressure exhaust button.

Model
AKP–M5/U10 AKP–01 AKP–02 AKP–03 AKP–04

Operating force [N] (Reference value)
5.3 to 8.2 5.1 to 11.9 6.7 to 19.5 10.6 to 34.4 17.1 to 54.4

Operating depth [mm] 3.5 3.9 3.8 4.7 5.8

13. After operating the residual pressure exhaust button, confirm that the button has returned to the normal position.

Make sure that the residual pressure exhaust button has returned to the end face of the product before operating again. If the button cannot return to the normal position, the intermediate stop function of the actuator will not work. Therefore, replace the product with a new one.

14. Pay attention to the motion of the actuator at the time of restart after the release of residual pressure.

When restarting the product after releasing the residual pressure, check the initial driving direction, confirm that the work area is secured, and then restart the product. Failure to follow this instruction may cause the actuator to suddenly move.

15. When the product is used in a balance control circuit, the check valve may not be released even when the pilot pressure is 50 % of the operating pressure. In this case, obtain the pilot pressure from a position so that the pilot pressure is equivalent to the operating pressure. When using the product at the minimum operating pressure, set the pilot pressure to 0.1 MPa or higher. However, for “AKP–M5” or “AKP–U10,” set the pilot pressure to 0.15 MPa or higher.

16. As a reference, we have confirmed through our durability tests that the check valve has a durability against 10 million cycles of ON and OFF operations and the residual pressure exhaust button has a durability against 10,000 cycles of operation at the maximum operating pressure. However, note that the tests were conducted under limited conditions.

AKP Series
Specific Product Precautions 3
Be sure to read this before handling the products. Refer to the back cover for safety instructions. For flow control equipment precautions, refer to the “Handling Precautions for SMC Products” and the “Operation Manual” on the SMC website: https://www.smc.eu

Design
Warning
17. In the following cases, malfunctioning or noise due to oscillation may occur. · When the differential pressure between the port 1 side and port 2 side is smaller than the min. operating pressure · When the IN side piping of the product or the effective area of the directional control valve is smaller than that of the product · When the pressure drop on the port 1 side is slower than that of the port 2 side during operation of the product · When the supply pressure at the port 21 is reduced (Refer to the piping diagram below.) · When the port 1 side piping (tube) is bent or crushed

1 21 21 1

Recommended

Not recommended

Mounting
Warning
1. Operation manual Install the product and operate it only after reading the operation manual carefully and understanding its contents. Also, keep the manual where it can be referred to as necessary.
2. Ensure sufficient space for maintenance activities. When installing the products, allow access for maintenance and inspection.
3. Tighten threads with the proper tightening torque. When installing the products, follow the listed torque specifications.
4. Screw the R screw into the Rc thread, the NPT screw into the NPT thread and the G screw into the G thread.
5. Mount after confirming the piping direction. Connect the IN side to the directional control valve and OUT side to the actuator.
12

Mounting

Warning
6. Do not apply excessive force or shock to the fittings or other parts of the product with tools.
Doing so may result in damage or air leakage. When connecting piping, use a tube of sufficient length, in accordance with the recommended piping conditions described in Fig. 1 on page 14. When binding the piping together with a tying band, etc., be sure that external force is not being applied to the piping. (Refer to Fig. 2 on page 14.)
7. Refer to the Fittings and Tubing Precautions in the catalogue on https://www.smc.eu for handling One-touch fittings.

8. Pay attention to the method of mounting on the cylinder.
For the horizontal type, a hexagon wrench needs to be used. The product cannot be mounted with an open-end wrench. For the mounting of the vertical type, an open-end wrench needs to be used. Note that the mounting method differs between the vertical type and horizontal type.
9. Conduct mounting and removal of the vertical type by holding the width across flats of the body B and turning it by using an appropriate wrench.
Do not apply torque at other points, as the product may be damaged. Rotate body A manually for positioning after installation.
10. To install and remove the horizontal type product with hexagonal hole, use an appropriate hex key and push it into the hexagon hole of the stud.
Do not apply torque at other points, as the product may be damaged. Rotate the end body manually for positioning after installation. Refer to the applicable dimension of the hexagon wrench.

Connection

thread

size

Hexagon wrench Metric size

(Nominal

width across Inch size

flats)

M5, 10-32UNF

2.5

—

R1/8, G1/8

—

NPT1/8

—

7/32″

R1/4, G1/4

—

NPT1/4

—

5/16″

R3/8, G3/8

—

NPT3/8

—

3/8″

R1/2, G1/2

—

NPT1/2

—

3/8″

Stud

End body

Body A Body B
Vertical

Horizontal

AKP Series
Specific Product Precautions 4
Be sure to read this before handling the products. Refer to the back cover for safety instructions. For flow control equipment precautions, refer to the “Handling Precautions for SMC Products” and the “Operation Manual” on the SMC website: https://www.smc.eu

Mounting
Warning
11. Do not use this product in the operating condition where moment loads will be constantly applied to the product. The fitting section and the product may be damaged.
Caution
M5 and 10-32UNF

1) Tightening method

First, tighten it by hand, then give it an additional 1/6 turn to 1/4 turn with a wrench. The reference value for the tightening torque is 1 to 1.5 N·m. Excessive tightening may damage the thread portion or
deform the gasket and cause air leakage. If the screw is too shallowly screwed in, it may come loose or air may leak.

2) Tightening method
In compliance with ISO16030 Standards (air pressure fluid dynamics connection ports and stud ends), the chamfered thread sizes shown below are recommended.

ØD

Female thread size

Chamfer dimension Ø D (Recommended value)

45$

10-32UNF

5.1 to 5.4 5.0 to 5.3

R, NPT and G Thread

1) Tightening method

When tightening the stud, insert an appropriate hexagon wrench to the hexagonal hole after tightening it by hand. Use the tightening torque shown in the table below as a guide.

Connection thread size 1/8 1/4 3/8 1/2

Proper tightening torque [N·m] 3 to 5 8 to 12
15 to 20 20 to 25

2) Chamfered area for female thread

By chamfering as shown in the following table, machining of threads is easier and effective for burr prevention.

Connection thread size
1/8 1/4 3/8 1/2

Chamfer dimension Ø D (Recommended value)

NPT

10.2 to 10.4 10.5 to 10.7

9.8 to 10.2

13.6 to 13.8 14.1 to 14.3 13.3 to 13.7

17.1 to 17.3 17.4 to 17.6 16.8 to 17.2

21.4 to 21.6 21.7 to 21.9 21.0 to 21.4

G thread (face seal) complies with ISO 16030-2001.

Piping Threads with Sealant
Caution
1. If the fitting is tightened with excessive torque, a large amount of sealant will seep out. Remove the excess sealant.
2. Insufficient tightening may loosen the threads or cause air leakage.
3. For reuse 1) Normally, fittings with a sealant can be reused up to 2 to 3 times. 2) To prevent air leakage through the sealant, remove any loose sealant stuck to the fitting by blowing air over the threaded portion. 3) If the sealant no longer provides effective sealing, wind sealant tape over the sealant before reusing. Do not use any form other than the tape type of sealant.
4. Once the fitting has been tightened, backing it out to its original position often causes the sealant to become defective. Air leakage will occur.
5. Use R external threads with Rc internal threads and NPT external threads with NPT internal threads.

Piping
Caution
1. Refer to the Fittings and Tubing Precautions in the catalogue on https://www.smc.eu for handling One-touch fittings.
2. Preparation before piping Before piping is connected, it should be thoroughly blown out with air (flushing) or washed to remove chips, cutting oil, and other debris from inside the pipe.
3. Winding of sealant tape When screwing piping or fittings into ports, ensure that chips from the pipe threads or sealing material do not enter the piping. Also, if sealant tape is used, leave 1 thread ridge exposed at the end of the threads.
Winding direction

1 tEhxrepaodse approx.

Sealant tape

ØD

Rz12.5

45$

AKP Series
Specific Product Precautions 5
Be sure to read this before handling the products. Refer to the back cover for safety instructions. For flow control equipment precautions, refer to the “Handling Precautions for SMC Products” and the “Operation Manual” on the SMC website: https://www.smc.eu

One-touch Fittings Mounting / Piping
Caution
1. Installation and removal of tubing for One-touch fittings 1) Installation of tubing (1) Cut the tubing perpendicularly, being careful not to damage the outside surface. Use an SMC tube cutter TK-1, 2, 3, or 6. Do not cut the tubing with pliers, nippers, scissors, etc., otherwise the tubing will be deformed and problems may result. (2) The outside diameter of the polyurethane tubing swells when internal pressure is applied to it. Therefore, it may be impossible to re-insert the tubing into the One-touch fitting. Check the tubing outside diameter, and when the accuracy of the outside diameter is +0.07 mm or larger for Ø 2, +0.15 mm or larger for other sizes, re-insert it into the One-touch fitting without cutting the tubing. When the tubing is reinserted into the One-touch fitting, confirm that the tubing goes through the release button smoothly. (3) Grasp the tube and push it in slowly, inserting it securely all the way into the fitting. (4) Pull the tubing back gently to make sure it has a positive seal. Insufficient installation may cause air to leak or the tubing to release. 2) Removal of tubing (1) Push the release button flange evenly and sufficiently to release the tube. (2) Pull out the tubing while keeping the release button depressed. If the release button is not held down sufficiently, the tubing cannot be withdrawn. (3) To reuse the tubing, remove the previously lodged portion of the tubing. If the lodged portion is left on without being removed, it may result in air leakage and make the removal of the tubing difficult.
2. Connecting products with metal rods After attaching products with attached metal rods such as the KC series, to the One-touch fitting, please do not use tubes, resin plugs, or reducers, etc. This may cause releasing.
3. When attaching tubes, resin plugs, metal rods, etc., do not push the release button while attaching. Also, do not push the release button before attaching. This may cause releasing.
14

Recommended Piping Conditions
1. When connecting piping to the One-touch fitting, use a pipe length with sufficient margin, in accordance with the piping conditions shown in Fig. 1. Also, when using a tying band, etc., to bind the piping together, make sure that external force does not come to bear on the fitting. (See Fig. 2.)

Straight line

Mounting pitch A

Tubing size
Ø 4, 5/32″ Ø 6
Ø 1/4″ Ø 8, 5/16″
Ø 10 Ø 12

Fig. 1 Recommended piping
Mounting pitch A Nylon tubing Soft nylon tubing Polyurethane tubing
56 or more 44 or more 26 or more 84 or more 66 or more 39 or more 89 or more 70 or more 57 or more 112 or more 88 or more 52 or more 140 or more 110 or more 69 or more 168 or more 132 or more 88 or more

Unit: [mm] Straight line
length 20 or more 30 or more 32 or more 40 or more 50 or more 60 or more

Recommended Not recommended
Fig. 2 When using a tying band to bind the piping together
Air Supply
Warning
1. Type of fluids Please consult with SMC when using the product in applications other than compressed air.
2. When there is a large amount of drainage Compressed air containing a large amount of drainage can cause the malfunction of pneumatic equipment. An air dryer or water separator should be installed upstream from filters.
3. Drain flushing If condensation in the drain bowl is not emptied on a regular basis, the bowl will overflow and allow the condensation to enter the compressed air lines. This causes the malfunction of pneumatic equipment. If the drain bowl is difficult to check and remove, the installation of a drain bowl with an auto drain option is recommended. For compressed air quality, refer to the catalogue on https://www.smc.eu.
4. Use clean air. Do not use compressed air that contains chemicals, synthetic oils that include organic solvents, salt, corrosive gases, etc., as it can cause damage or malfunction.

AKP Series
Specific Product Precautions 6
Be sure to read this before handling the products. Refer to the back cover for safety instructions. For flow control equipment precautions, refer to the “Handling Precautions for SMC Products” and the “Operation Manual” on the SMC website: https://www.smc.eu

Air Supply
Caution
1. Install an air filter. Install an air filter upstream near the valve. For the filtration rating, select 5 m or below, or select a rating equivalent to or lower than ISO 8573-1:2010 [6:4:4]1. 1 This is equivalent to the filtration performance achieved when an air filter is attached for inlet side compressed air with purity class of [7:4:4].
2. Ensure that the fluid and ambient temperatures are within the specified range. If the fluid temperature is 5 °C or less, the moisture in the circuit could freeze, causing damage to the seals or leading to equipment malfunction. Therefore, take appropriate measures to prevent freezing. For compressed air quality, refer to the Catalogue on https://www.smc.eu.
Operating Environment
Warning
1. Do not use in an atmosphere containing corrosive gases, chemicals, sea water, water, water steam, or where there is direct contact with any of these.
2. Do not expose the product to direct sunlight for an extended period of time.
3. Do not mount the product in locations where it is exposed to radiant heat.
Maintenance
Warning
1. Perform maintenance and inspection according to the procedures indicated in the operation manual. If handled improperly, malfunction or damage of machinery and equipment may occur.
2. Maintenance work If handled improperly, compressed air can be dangerous. Assembly, handling, repair, and element replacement of pneumatic systems should be performed by a knowledgeable and experienced person.
3. Drain flushing Remove drainage from air filters regularly.
4. Removal of equipment, and supply/exhaust of compressed air Before components are removed, first confirm that measures are in place to prevent workpieces from dropping, run-away equipment, etc. Then, cut off the supply pressure and electric power, and exhaust all compressed air from the system using the residual pressure release function. When machinery is restarted, proceed with caution after confirming that appropriate measures are in place to prevent sudden movement.

14-1

Safety Instructions

These safety instructions are intended to prevent hazardous situations and/or equipment damage. These instructions indicate the level of potential hazard with the labels of “Caution,” “Warning” or “Danger.” They are all important notes for safety and must be followed in addition to International Standards (ISO/IEC) 1), and other safety regulations.

Caution: Warning: Danger:

Caution indicates a hazard with a low level of risk which, if not avoided, could result in minor or moderate injury.
Warning indicates a hazard with a medium level of risk which, if not avoided, could result in death or serious injury.
Danger indicates a hazard with a high level of risk which, if not avoided, will result in death or serious injury.

1) ISO 4414: Pneumatic fluid power General rules relating to systems. ISO 4413: Hydraulic fluid power General rules relating to systems. IEC 60204-1: Safety of machinery Electrical equipment of machines. (Part 1: General requirements) ISO 10218-1: Manipulating industrial robots – Safety. etc.

Warning
1. The compatibility of the product is the responsibility of the person who designs the equipment or decides its specifications. Since the product specified here is used under various operating conditions, its compatibility with specific equipment must be decided by the person who designs the equipment or decides its specifications based on necessary analysis and test results. The expected performance and safety assurance of the equipment will be the responsibility of the person who has determined its compatibility with the product. This person should also continuously review all specifications of the product referring to its latest catalogueue information, with a view to giving due consideration to any possibility of equipment failure when configuring the equipment.
2. Only personnel with appropriate training should operate machinery and equipment. The product specified here may become unsafe if handled incorrectly. The assembly, operation and maintenance of machines or equipment including our products must be performed by an operator who is appropriately trained and experienced.
3. Do not service or attempt to remove product and machinery/ equipment until safety is confirmed. 1. The inspection and maintenance of machinery/equipment should only be performed after measures to prevent falling or runaway of the driven objects have been confirmed. 2. When the product is to be removed, confirm that the safety measures as mentioned above are implemented and the power from any appropriate source is cut, and read and understand the specific product precautions of all relevant products carefully. 3. Before machinery/equipment is restarted, take measures to prevent unexpected operation and malfunction.
4. Contact SMC beforehand and take special consideration of safety measures if the product is to be used in any of the following conditions. 1. Conditions and environments outside of the given specifications, or use outdoors or in a place exposed to direct sunlight. 2. Installation on equipment in conjunction with atomic energy, railways, air navigation, space, shipping, vehicles, military, medical treatment, combustion and recreation, or equipment in contact with food and beverages, emergency stop circuits, clutch and brake circuits in press applications, safety equipment or other applications unsuitable for the standard specifications described in the product catalogueue. 3. An application which could have negative effects on people, property, or animals requiring special safety analysis. 4. Use in an interlock circuit, which requires the provision of double interlock for possible failure by using a mechanical protective function, and periodical checks to confirm proper operation.
Caution
1. The product is provided for use in manufacturing industries. The product herein described is basically provided for peaceful use in manufacturing industries. If considering using the product in other industries, consult SMC beforehand and exchange specifications or a contract if necessary. If anything is unclear, contact your nearest sales branch.

Limited warranty and Disclaimer/Compliance Requirements
The product used is subject to the following “Limited warranty and Disclaimer” and “Compliance Requirements”.Read and accept them before using the product.
Limited warranty and Disclaimer
1. The warranty period of the product is 1 year in service or 1.5 years after the product is delivered, whichever is first. 2) Also, the product may have specified durability, running distance or replacement parts. Please consult your nearest sales branch.
2. For any failure or damage reported within the warranty period which is clearly our responsibility, a replacement product or necessary parts will be provided. This limited warranty applies only to our product independently, and not to any other damage incurred due to the failure of the product.
3. Prior to using SMC products, please read and understand the warranty terms and disclaimers noted in the specified catalogueue for the particular products.
2) Vacuum pads are excluded from this 1 year warranty. A vacuum pad is a consumable part, so it is warranted for a year after it is delivered. Also, even within the warranty period, the wear of a product due to the use of the vacuum pad or failure due to the deterioration of rubber material are not covered by the limited warranty.
Compliance Requirements
1. The use of SMC products with production equipment for the manufacture of weapons of mass destruction (WMD) or any other weapon is strictly prohibited.
2. The exports of SMC products or technology from one country to another are governed by the relevant security laws and regulations of the countries involved in the transaction. Prior to the shipment of a SMC product to another country, assure that all local rules governing that export are known and followed.
Caution
SMC products are not intended for use as instruments for legal metrology. Measurement instruments that SMC manufactures or sells have not been qualified by type approval tests relevant to the metrology (measurement) laws of each country. Therefore, SMC products cannot be used for business or certification ordained by the metrology (measurement) laws of each country.

Safety Instructions

Be sure to read “Handling Precautions for SMC Products” (M-E03-3) before using.

SMC Corporation (Europe)

Austria

+43 (0)2262622800 www.smc.at

Belgium

+32 (0)33551464 www.smc.be

Bulgaria

+359 (0)2807670 www.smc.bg

Croatia

+385 (0)13707288 www.smc.hr

Czech Republic +420 541424611 www.smc.cz

Denmark

+45 70252900 www.smcdk.com

Estonia

+372 651 0370 www.smcee.ee

Finland

+358 207513513 www.smc.fi

France

+33 (0)164761000 www.smc-france.fr

Germany

+49 (0)61034020 www.smc.de

Greece

+30 210 2717265 www.smchellas.gr

Hungary

+36 23513000 www.smc.hu

Ireland

+353 (0)14039000 www.smcautomation.ie

Italy

+39 03990691 www.smcitalia.it

Latvia

+371 67817700 www.smc.lv

office@smc.at info@smc.be office@smc.bg office@smc.hr office@smc.cz smc@smcdk.com info@smcee.ee smcfi@smc.fi supportclient@smc-france.fr info@smc.de sales@smchellas.gr office@smc.hu sales@smcautomation.ie mailbox@smcitalia.it info@smc.lv

Lithuania +370 5 2308118 www.smclt.lt

Netherlands +31 (0)205318888 www.smc.nl

Norway +47 67129020

www.smc-norge.no

Poland +48 222119600 www.smc.pl

Portugal +351 214724500 www.smc.eu

Romania +40 213205111 www.smcromania.ro

Russia +7 (812)3036600 www.smc.eu

Slovakia +421 (0)413213212 www.smc.sk

Slovenia +386 (0)73885412 www.smc.si

Spain

+34 945184100 www.smc.eu

Sweden +46 (0)86031240 www.smc.nu

Switzerland +41 (0)523963131 www.smc.ch

Turkey +90 212 489 0 440 www.smcturkey.com.tr

+44 (0)845 121 5122 www.smc.uk

info@smclt.lt info@smc.nl post@smc-norge.no offi ce@smc.pl apoioclientept@smc.smces.es smcromania@smcromania.ro sales@smcru.com offi ce@smc.sk offi ce@smc.si post@smc.smces.es smc@smc.nu info@smc.ch info@smcturkey.com.tr sales@smc.uk

South Africa +27 10 900 1233 www.smcza.co.za

zasales@smcza.co.za

Printing BV 00 Printed in Spain

Specifications are subject to change without prior notice and any obligation on the part of the manufacturer

Documents / Resources

SMC AKP Series Compact Type Pilot Check Valve [pdf] Instruction Manual
AKP Series Compact Type Pilot Check Valve, AKP Series, Compact Type Pilot Check Valve, Pilot Check Valve, Check Valve, Valve

References

User Manual

SMC AKP Series Compact Type Pilot Check Valve Instruction Manual

AKP Series Compact Type Pilot Check Valve

Specifications

Product Usage Instructions

Mounting Instructions

Functionality

Variations and Selection

Tubing and Port Sizes

FAQ

Q: What should I do before handling the products?

Documents / Resources

References

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