Danfoss AVQM Flow Controller Installation

Flow and temperature controller with integrated control valve, WE-version (PN 25)

• AVQM-WE – f low controller with integrated control valve
• AVQMT-WE – f low and temperature controller with integrated control valve

Description

• AVQM-WE is a self-acting flow controller with integrated control valve primarily for use in district heating systems. The controller closes when set max. flow is exceeded.
• AVQMT-WE is a self-acting flow and temperature controller with integrated control valve primarily for use in district heating systems. The controller closes on rising temperature or when set max. flow is exceeded. All controllers have special designed (pressure relieved) control valve insert.
• AVQM-WE controller can be combined with Danfoss electrical actuators AMV(E) (and controlled by ECL electronic controllers).
• AVQMT-WE controller can be combined with Danfoss electrical actuators AMV(E) (and controlled by ECL electronic controllers) and with AVT or STM thermostatic actuators.

The controllers have a control valve with adjustable flow restrictor, connection neck for electrical actuator, connection neck for thermostat (AVQMT-WE only), and an actuator with one control diaphragm.

AVQM-WE and AVQMT-WE are used together with Danfoss electrical actuators:

• AMV 150 1)
• AMV(E) 10 1) / AMV(E) 20 / AMV(E) 30
• AMV(E) 13 1) / AMV(E) 23 / AMV(E) 33 with spring return function
• AMV 20 SL / AMV 23 SL / AMV 30 SL with stroke limitation

AMV 150 / AMV(E) 10 / AMV(E) 13 can be combined with DN 15 controller only.

AVQM(T)-WE combined with AMV(E) 13, AMV(E) 23 (SL) or AMV(E) 33 (SL) has been approved according to DIN 32730. The controllers combined with AVT and STM thermostats are type-tested acc. to EN 14597. Controllers combined with STM thermostats protect systems against exceeding temperatures.

Applications:

• District heating systems acc. to DIN 4747
• Heating systems acc. to EN 12828 (DIN 4751) and EN 12953-6 (DIN 4752)
• Water heating systems for drinking and industrial waters acc. to DIN 4753

Main data:

• DN 15-50
• kVS 2.5-25 m3/h
• PN 25
• Setting ranges:
  • AVT thermostat:
  • 10 … 40 °C / 20 … 70 °C / 40 … 90 °C / 60 … 110 °C and 10 … 45 °C / 35 … 70 °C / 60 … 100 °C / 85 … 125 °C
  • STM monitor 20 … 75 °C / 40 … 95 °C / 30 … 110 °C
• Flow restrictor ∆p: 0.2 bar
• Temperature:
  • Circulation water / glycolic water up to 30%: 2 … 150 °C
• Connections:
  • Ext. thread (weld-on, thread and flange tailpieces)
  • Flange
• Flow and return mounting.

Ordering

Example 1 –  AVQM-WE controller:
Flow controller with integrated control valve; DN 15; kVS 2.5; PN 25; flow restrictor ∆p 0.2 bar; Tmax 150 °C; ext. thread

• 1× AVQM-WE DN 15 controller Code No: 003H7080

Option: 1× Weld-on tailpieces Code No: 003H6908

The controller will be delivered completely assembled, inclusive impulse tube between valve and actuator. Electrical actuator AMV(E) must be ordered separately.

Example 2 –
AVT (or STM) / AVQMT-WE controller: Flow and temperature controller with integrated control valve, DN 15; kVS 2.5; PN 25; setting range 40 … 90 °C; flow restrictor ∆p 0.2 bar; Tmax 150 °C; ext. thread

• 1× AVQMT-WE DN 15 controller Code No: 003H7084
• 1× AVT thermostatic actuator, 40 … 90 °C Code No: 065-0598

Option:

• – 1× Weld-on tailpieces
  Code No: 003H6908

The controller AVQMT-WE will be delivered completely assembled, inclusive impulse tube between valve and actuator. Thermostatic actuator AVT will be delivered separately. Electrical actuator AMV(E) must be ordered separately. In case of safety temp. monitoring STM should be ordered instead of AVT.

Example 3 –
STM / AVT / AVQMT-WE controller: Flow and temperature controller with safety temperature monitor and integrated control valve, DN 15, kVS 2.5; PN 25; setting range 40 … 90 °C; limit range 30 … 110 °C; flow restrictor ∆p 0.2 bar; Tmax 150 °C; ext. thread

• 1× AVQMT-WE DN 15 controller Code No 0: 03H6787
• 1× AVT thermostatic actuator, 40 … 90 °C Code No 0: 65-0598
• 1× STM monitor, 30 … 110 °C Code No 0: 65-0608
• 1× K2 Combination piece Code No 0: 03H6855

Option: 1× Weld-on tailpieces Code No: 003H6908

The controller AVQMT-WE will be delivered completely assembled, inclusive impulse tube between valve and actuator. Combination piece K2, thermostats AVT and STM will be delivered separately. Electrical actuator AMV(E) must be ordered separately.

AVQM-WE Controller

AVQMT-WE Controller

Picture	DN (mm)	kVS (m3/h)	Connection		Code No.
	15	2.5	Cylindr. ext. thread acc. to ISO 228/1	G ¾ A	003H7084
		4.0			003H7085
	20	6.3		G 1 A	003H7086
	25	8.0		G 1¼ A	003H7087

AVT Thermostatic actuator

Picture	For valves	Setting range (°C)	Temperature sensor with brass immersion pocket, length, connection	Code No.
	DN 15-25	–10 … +40	170 mm, R ½ 1)	065-0596
		20 … 70		065-0597
		40 … 90		065-0598
		60 … 110		065-0599
		10 … 45	255 mm, R ¾ 1) 2)	065-0604
		35 … 70		065-0605
		60 … 100		065-0606
		85 … 125		065-0607

1. conic male thread EN 10226-1
2. without immersion pocket

STM Safety temperature monitor (actuator)

Picture	For valves	Limit range (°C)	Temperature sensor with brass immersion pocket, length, connection	Code No.
	DN 15-25	30 … 110	210 mm, R ¾ 1)	065-0608
		20 … 75		065-0609
		40 … 95		065-0610

conic male thread EN 10226-1

Accessories for valves

Picture	Type designation	DN	Connection		Code No.
	Weld-on tailpieces	15	–		003H6908
		20			003H6909
		25			003H6910
	External thread tailpieces	15	Conical ext. thread acc. to EN 10226-1	R ½	003H6902
		20		R ¾	003H6903
		25		R 1	003H6904
	Flange tailpieces	15	Flanges PN 25, acc. to EN 1092-2		003H6915
		20			003H6916
		25			003H6917

Accessories for thermostats

Picture	Type designation	PN	For thermostats	Material	Code No.
	Immersion pocket	25	AVT	Brass	065-4414 1)
				Stainless steel, mat. No. 1.4571	065-4415 1)
			STM	Brass	065-4416 1)
				Stainless steel, mat. No. 1.4435	065-4417 1)
	Combination piece K2				003H6855

Not for AVT thermostatic actuator code numbers: 065-0604, 065-0605, 065-0606, 065-0607

Service kits

For AVQM-WE and AVQMT-WE controlers

Technical data

Valve

Nominal diameter

DN

15

20

25

32

40

50

kVS value of dp controller

m3/h

2.5

4.0

6.3

8.0

12.5

16/201)

20/251)

Range of max. flow setting

pMCV = 0.2 bar

Qmin

0.07

0.07

0.16

0.2

0.4

0.8

0.8

Qmax

1.6

2.4

3.5

4.5

10

10.5/121)

12/141)

Avalible  p required for Qmax2)

bar

0.6

0.6

0.5

0.5

0.8

0.8/0.61)

0.8/0.61)

Stroke

mm

5

7

10

Control valve authority

1 (100%) in the range of flow setting

Control characteristic

Logarithmic

Cavitation factor z

≥ 0.6

≥ 0.55

≥ 0.5

Leakage acc. to standard IEC 534

% of kVS

≤ 0.02

≤ 0.05

Nominal pressure

PN

25

Min. differential pressure

bar

see remark 2)

Max. differential pressure

20

16

Medium

Circulation water / glycolic water up to 30%

Medium pH

Min. 7, max. 10

Medium temperature

oC

2 … 150

Connections

valve

External thread

Flange

tailpieces

Weld-on, external thread and flange

⁄

Materials

Valve body

Red bronze CuSn5ZnPb (Rg5)

Ductile iron EN-GJS-400-18-LT (GGG 40.3)

Valve seat

Stainless steel, mat. No. 1.4571

Valve cone

Dezincing free brass CuZn36Pb2As

Sealing DP, CV

EPDM

Pressure relieve system

Control valve insert

Piston

Valve insert

Note: DP – diff. pressure controller, MCV – control valve

1. Flanged version
2. For flows smaller than 

Actuator

Type			AVQM-WE, AVQMT-WE
Actuator size		cm2	54
Nominal pressure		PN	25
Flow restrictor diff. pressure		bar	0.2
Materials
Housing	Upper housing of actuator		Stainless steel, mat. No.1.4301
	Lower housing of actuator		Dezincing free brass CuZn36Pb2As
Diaphragm			EPDM
Impulse tube			Copper tube Ø 6 × 1 mm

AVT Thermostatic actuator

Setting range Xs		°C	−10 … 40 / 20 … 70 / 40 … 90 / 60 … 110 10 … 45 / 35 … 70 / 60 … 100 / 85 … 125
Time constant T acc. to EN 14597		s	max. 50 (170 mm, max. 30 (255 mm)
Gain Ks		mm/°K	0.2 (170 mm); 0.7 (255 mm)
Max. adm. temperature at sensor			50 °C above maximum setpoint
Max. amb. temperature at thermostat		°C	0 … 70
Nominal pressure sensor		PN	25
Nominal pressure immerison pocket
Capillary tube length			5 m (170 mm), 4 m (255 mm)
Materials
Temperature sensor			Cooper
Immersion pocket 1)	Ms design		Brass, nickel-plated
	Stainless steel design		Mat. No. 1.4571 (170 mm)
Handle for temp. setting			Polyamide, glass fiber-reinforced
Scale carrier			Polyamide

for sensor 170

STM Safety temperature monitor (actuator)

Limit range Xs		°C	20 … 75 / 40 … 95 / 30 … 110
Time constant T acc. to EN 14597		s	max. 100
Gain Ks		mm/°K	0.3
Max. adm. temperature at sensor			80 °C above maximum setpoint
Max. amb. temperature at thermostat		°C	0 … 70
Nominal pressure sensor		PN	25
Nominal pressure immerison pocket
Capillary tube length		m	5
Materials
Temperature sensor			Cooper
Immersion pocket	Ms design		Brass, nickel-plated
	Stainless steel design		mat. No. 1.4435
Handle for temp. setting			Polyamide, glass fiber-reinforced
Scale carrier			Polyamide

Application principles

Combinations

• AVQM-WE / AMV(E)
  Flow controller with electrical actuator
• AVT / AVQMT-WE / AMV(E)
  Flow and temperature controller with electrical actuator
• STM / AVQMT-WE / AMV(E)
  Flow controller with safety temperature monitor and electrical actuator
• STM / AVT / AVQMT-WE / AMV(E)
  Flow and temperature controller with safety temperature monitor and electrical actuator

Installation positions

• Flow and temperature controller with integrated control valve (with AVT or STM)
• Up to medium temperature of 100 °C the controllers can be installed in any position.
• For higher temperatures the controllers have to be installed in horizontal pipes only, with a pressure and temperature actuator oriented downwards.

Electrical actuator
Note! Installation positions for electrical actuators AMV(E) have to be observed as well. Please see relevant Data sheet.

• Temperature sensor
  The place of installation must be chosen in a way that the temperature of the medium is directly taken without any delay. Avoid overheating of temperature sensor. The temperature sensor must be immersed into the medium in its full length.
• Temperature sensors 170 mm R½
  The temperature sensor may be installed in any position.
• Temperature sensor 255 mm R¾
  The temperature sensor must be installed as shown on the picture.

Pressure temperature diagram

Design

1. Control valve insert
2. Adjustable flow restrictor
3. Valve body
4. Valve insert
5. Pressure relieved valve cone
6. Valve stem
7. Built-in spring for flow rate control
8. Control drain
9. Control diaphragm
10. Union nut
11. Impulse tube
12. Upper casing of diaphragm
13. Lower casing of diaphragm
14. Thermostat AVT, STM
15. Thermostat stem
16. Bellows
17. Setting spring for temperature control
18. Handle for temperature setting, prepared for sealing
19. Scale carrier
20. Capillary tube
21. Flexible protected pipe (at 255mm only)
22. Temperature sensor
23. Immersion pocket
24. Sensor stuffing box
25. Housing of sensor stuffing box
26. Safety spring

Function

• Flow and temperature controller with integrated control valve (AVQM-WE, AVQMT-WE)
  Flow volume causes pressure drop across the adjustable flow restrictor. Resulting pressures are being transferred through the impulse tubes and/or control drain in the actuator stem to the actuator chambers and act on control diaphragm for flow control. The flow restrictor diff. pressure is controlled and limited by means of built-in spring for flow control. Control valve closes on rising differential pressure and opens on falling differential pressure to control max flow. Additionally the electrical actuator will operate from zero to set max. flow according to the load.
• Safety Temperature Monitor (STM): Function
  The safety temperature monitor is proportional temperature controller which controls temperature and protects the system against exceeding temperatures. The valve cone is soft sealed and pressure relieved. In case the temperature at the temperature sensor exceeds the adjusted set point, safety temperature monitor interrupts energy supply by closing the valve. As soon as the temperature at the temperature sensor drops, the valve opens automatically. Handle for limit setting can be sealed.
• Extended safety function
  If there is a leakage in the area of the temperature sensor, the capillary tube, or the thermostat, the valve closes by a safety spring in the safety thermostat. In this case safety temperature monitor (actuator) must be replaced.
• Physical Function Principle
  The safety temperature monitor operates in accordance with the liquid expansionprinciple. The temperature sensor, the capillary tube and the bellows are filled with liquid. As the temperature at the temperature sensor rises, the liquid expands, the thermostat stem moves out and closes the valve.
• Temperature Controller (AVT): Function
  By increasing of medium temperature control valve cone moves towards the seat (valve closes), by decreasing of medium temperature valve cone moves away from the seat (valve opens). Handle for temperature setting can be sealed.
• Physical Function Principle
  Medium temperature changes cause pressure changes in temperature sensor. Resulting pressure is being transferred through the capillary tube to the bellows. Bellows moves thermostat stem and opens or closes the valve.

Settings

• Flow setting
  Flow setting is being done by the adjustment of the flow restrictor position. The adjustment can be performed on the basis of flow adjustment diagram (see relevant instructions) and/or by the means of heat meter.
• Temperature setting (AVT)
  Temperature setting is being done by the adjustment of the setting spring for temperature control. The adjustment can be done by means of handle for temperature setting and/or temperature indicators.
• Limit setting (STM)
  Limit setting is being done by the adjustment of the setting spring for temperature control. The adjustment can be done by means of handle for limit setting and/or temperature indicators.

Adjustment diagram

Temperature setting
Relation between scale numbers 1-5 and closing temperature.

Note: The values given are approximate

Note: STM Safety temperature monitor (actuator): temperature scale is already written on the product

Dimensions

Adjustment diagram

Temperature setting
Relation between scale numbers 1-5 and closing temperature.

Note: The values given are approximate

Note: STM Safety temperature monitor (actuator): temperature scale is already written on the product

Danfoss A/S

• Climate Solutions
• climatesolutions.danfoss.com
• +45 7488 2222
• E-Mail: climatesolutions@danfoss.com

Any information, including, but not limited to information on selection of product, its application or use, product design, weight, dimensions, capacity or any other technical data in product manuals catalogues descriptions, advertisements, etc. and whether made available in writing, orally, electronically, online or via download, shall be considered informative, and is only binding if and to the extent, explicit reference is made in a quotation or order confirmation. Danfoss cannot accept any responsibility for possible errors in catalogues, brochures, videos and other material. Danfoss reserves the right to alter its products without notice. This also applies to products ordered but not delivered provided that such alterations can be made without changes to form, fit or function of the product. All trademarks in this material are property of Danfoss A/S or Danfoss group companies. Danfoss and the Danfoss logo are trademarks of Danfoss A/S. All rights reserved.

Documents / Resources

Danfoss AVQM Flow Controller [pdf] Installation Guide 003R9131, 7369170-2, VI.56.I2.00, AVQM Flow Controller, AVQM, Flow Controller, Controller

References

• User Manual