299H Series Pressure Reducing Regulators

Figure 1. 299H Series Pressure Reducing Regulator: This image depicts a Fisher 299H Series pressure reducing regulator. It shows a robust, cast metal body with various pipe connections and a large, domed actuator casing on top. A smaller pilot assembly is integrally mounted to the side of the main actuator casing. The overall design suggests a heavy-duty industrial component for controlling gas or fluid pressure.

Introduction

Scope of the Manual

This Instruction Manual provides installation, adjustment and maintenance instructions and parts ordering information for the 299H Series regulators. Instructions and parts list for the 67C Series Instrument Supply Regulators are found in Instruction Manual D102601X012. Instructions and parts list for the P590 Series Filters are found in Instruction Manual D101555X012. Instructions and parts list for the Type VSX2 slam-shut are found in Instruction Manual D103695X012. Instructions and parts list for the Type VSX8 slam-shut are found in Instruction Manual D103127X012.

Description

The 299H Series pressure reducing regulators provide a broad capacity of controlled pressure ranges and capacities in a wide variety of distribution, industrial and commercial applications. A 299H Series regulator has a pilot integrally mounted to the actuator casing. The 299H Series regulators can handle inlet pressures up to 175 psi / 12.1 bar depending on orifice size.

The integral token relief on the Types 299HR and 299HVR regulators is located in the pilot and opens to relieve minor overpressure.

Specifications

Specifications for 299H Series constructions are given below. Some specifications for a given regulator as it originally comes from the factory are stamped on a nameplate located on the actuator upper casing.

Available Constructions

• Type 299H: Pilot-operated pressure reducing regulator with a pilot integrally mounted to the actuator casing.
• Type 299HR: A Type 299H with a token internal relief valve to relieve minor overpressure caused by thermal expansion.
• Type 299HV: Same as the Type 299H with a Type VSX8 slam-shut valve which provides overpressure or overpressure and underpressure protection.
• Type 299HVR: Same as the Type 299HV with an internal token relief valve.

Body Size and End Connection Styles

See Table 1

Maximum Operating Inlet Pressure by Orifice Size⁽¹⁾

• 1/4 x 3/8 in. / 6.4 x 9.5 mm: 175 psig / 12.1 bar
• 3/8 in. / 9.5 mm: 175 psig / 12.1 bar
• 1/2 in. / 13 mm: 175 psig / 12.1 bar
• 3/4 in. / 19 mm: 150 psig / 10.3 bar
• 7/8 in. / 22 mm⁽⁵⁾: 125 psig / 8.6 bar
• 1 in. / 25 mm⁽⁵⁾: 100 psig / 6.9 bar
• 1-3/16 in. / 30 mm⁽⁵⁾: 80 psig / 5.5 bar

Maximum Casing and Emergency Outlet Pressure⁽¹⁾

66 psig / 4.5 bar

Outlet (Control) Pressure Ranges⁽¹⁾⁽²⁾

See Table 2

Maximum Set Pressure for Type 299HV⁽¹⁾

16 psig / 1.1 bar

Maximum Set Pressure for Slam-Shut Device⁽¹⁾

See Table 2

Minimum and Maximum Slam-Shut Trip Pressure Ranges

• Types 299HV and 299HVR: 21 psig / 1.45 bar

Types VSX8 Sensing Line Connection

1/4 NPT

Pressure Control Accuracy (Fixed Factor)(PFM)

±1%⁽³⁾ of absolute control pressure

Minimum Differential Pressure For Full Stroke

1.5 psid / 0.10 bar d

Control Line Connections

3/4 NPT

Temperature Capabilities⁽¹⁾⁽⁶⁾

-20 to 150°F / -29 to 66°C

Approximate Weight

21 lbs / 10 kg

Pressure Registration

Internal, External or Dual Registration

Fixed Restriction Sizes

• 0.044 in. / 1.1 mm, Red (standard gain)
• 0.071 in. / 1.8 mm, Green (low gain)
• 0.082 in. / 2.1 mm, Blue (lower gain)

Options

• Filter⁽³⁾: A P590 Series filter installed in the pilot supply tubing between main body and pilot
• Filtered pilot supply regulator⁽³⁾⁽⁴⁾: A Type 67CF supply regulator with integral 5 micron Polyethylene filter
• Reed switch: An optional remote notification switch can be installed offering the capability to remotely notify the operator should VSX8 Series shut off occur (Types 299HV and 299HVR only).

Construction Materials

• Actuator Upper Casings: Aluminum
• Actuator Lower Casing: Aluminum
• Pilot Spring Case: Aluminum
• Actuator Diaphragm: Nitrile (NBR)
• Pilot Diaphragm: Nitrile (NBR)
• Pilot Inlet Screen: Stainless steel
• Valve Body: Cast iron, Ductile iron or Steel
• Orifice and Valve Stem: Aluminum
• Disk Holder: Aluminum holder with Nitrile (NBR) disk
• Main Disk Construction: Nitrile (NBR)
• Metal Trim Parts For Pilot: Aluminum
• Pilot Disk Construction: Nitrile (NBR)
• O-rings: Nitrile (NBR)
• Fittings: Steel (standard) or Stainless steel
• Tubing: Stainless steel

1. The pressure/temperature limits in this Instruction Manual and any applicable standard or code limitation should not be exceeded.
2. For optimum performance, a pilot supply regulator may be installed in the pilot supply tubing between the main valve and pilot.
3. A pilot supply regulator or a P590 Series filter (only one may be used, not both) may be ordered with the Type 299H, but not both.
4. For in. w.c., use a pilot supply regulator if actual inlet pressure varies more than ±20 psi / ±1.4 bar and published accuracy is required.
5. This orifice size is not available for Types 299HV and 299HVR.
6. Product has passed Emerson testing for lockup, relief start-to-discharge and reseal down to -40°.

The Type 299HV provide overpressure or overpressure and underpressure protection by completely shutting off the flow of gas to the downstream system. It comes with a Type VSX8 (299HV) slam-shut device which can be configured for Overpressure Shutoff (OPSO) or Overpressure and Underpressure Shutoff (OPSO/UPSO). The slam-shut device's actions are independent of the main valve and of variations to the inlet pressure. The Type VSX8 (299HV) slam-shut device has internal or external registration. External registration requires a downstream sensing line.

Table 1. Body Sizes and End Connection Styles

1. This flange is available with a face-to-face dimension of 7.5 in. / 190 mm or 10 in. / 254 mm.

Table 2. Outlet Pressure Ranges

1. Use a pilot supply regulator if actual inlet pressure varies more than ±20 psi / ±1.4 bar and the published accuracy is required.

Principle of Operation

Letter keys in this section refer to Figure 2 unless otherwise noted. Fast response and accuracy are made possible by the amplifying effect of the pilot and by the two-path control system. The function of the pilot is to sense change in the controlled pressure and amplify it into a larger change in the loading pressure. Any changes in outlet pressure act quickly on both the actuator diaphragm and the loading pilot, thus providing the precise pressure control that is characteristic of a two-path control system.

Upstream or inlet pressure is utilized as the operating medium, which is reduced through pilot operation to load the main diaphragm chamber. Tubing connects the inlet pressure to the pilot. Downstream or outlet pressure registers underneath the main diaphragm (E) and on top of pilot diaphragm (F). There are three different versions of pressure registration for the 299H Series.

Internal registration

Outlet pressure is registered through the throat (J) to the main diaphragm chamber and then through a small port (G) to the top of the pilot diaphragm.

External registration

The throat (J) is blocked and a downstream control line is connected to the pilot upper diaphragm chamber or the actuator lower diaphragm chamber. A small port (G) connects the two chambers.

Dual registration

The lower main diaphragm chamber registers outlet pressure through the throat (J) and the upper pilot diaphragm chamber registers downstream pressure by using a downstream control line. The port (G) between the chambers is blocked.

Type 299H

In operation, assume the outlet pressure is less than the setting of the pilot control spring (A). The top side of pilot diaphragm assembly (F) will have a lower pressure than the setting of the control spring (A). The control spring (A) forces the diaphragm assembly upward, opening the pilot orifice (C). Additional loading pressure is supplied from the pilot orifice to the top side of the main diaphragm (E).

Figure 2. 299H Series Operational Schematics: This figure illustrates the internal workings and pressure registration types of the 299H Series regulators, including the 299HR token relief detail. Pressure zones are indicated by shading: Inlet Pressure (dark gray), Outlet Pressure (light gray), Atmospheric Pressure (cross-hatch), and Loading Pressure (dots).

Internal Registration Schematic

Shows the regulator with inlet and outlet connections. A control line connection is present but not actively used for sensing. Inlet pressure flows into the main body. Outlet pressure is sensed internally via throat (J) and a small port (G) leading to the pilot diaphragm. Loading pressure is applied to the main diaphragm (E) from the pilot. Key components shown include the main diaphragm (E), pilot diaphragm (F), bleed restriction (H), throat (J), valve disk (K), pilot control spring (A), pilot orifice (C), and pilot supply screen.

External Registration Schematic

Similar to internal registration, but the throat (J) is blocked. A 3/4 NPT downstream control line connection is used to sense outlet pressure, which is routed to the pilot upper diaphragm chamber. A small port (G) connects the two chambers.

Dual Registration Schematic

The lower main diaphragm chamber registers outlet pressure through the throat (J). The upper pilot diaphragm chamber registers downstream pressure via a 3/4 NPT downstream control line. The port (G) between the chambers is blocked.

Type 299HR (Token Relief Detail)

This section shows two states of the token relief mechanism within the pilot assembly:

• Token Relief Closed: Depicts the pilot assembly in its normal operating state, with the diaphragm head seated against the diaphragm post.
• Token Relief Open: Illustrates the pilot diaphragm head separated from the diaphragm post, creating a path for minor gas release due to overpressure. This movement occurs when the diaphragm head contacts the pilot spring case.

This creates a higher pressure on the top side of the main diaphragm (E) than on the bottom side, forcing the diaphragm downward. This motion is transmitted through a lever, which pulls the valve disk (K) open, allowing inlet pressure to flow through the valve.

When the demand in the downstream system has been satisfied, the outlet pressure increases. The increased pressure is transmitted through the downstream control line (for external or dual registration) or through the port (G) (for internal registration) and acts on top of the pilot diaphragm (F). This pressure exceeds the pilot spring setting and forces the diaphragm down, closing the orifice (C). The loading pressure acting on the main diaphragm (E) bleeds to the downstream system through a bleed restriction (H).

With a decrease in loading pressure on top of the main diaphragm (E), the main closing spring (B) exerts an upward force on the diaphragm post which is connected to the main diaphragm (E), pulling it upward. This moves the main valve disk (K) toward its seat, decreasing flow to the downstream system.

Type 299HR

During normal operation the Type 299HR performance is identical to the Type 299H. If an overpressure condition occurs, the pilot diaphragm head will separate from the pilot diaphragm post and travel until it contacts the pilot spring case. The movement of the diaphragm head creates a path and a token or small amount of gas will be released.

When the overpressure condition ceases, the pilot diaphragm head will return to the diaphragm post and the regulator will return to normal operation.

Type 299HV

The Type VSX8 (299HV) slam-shut device on the Type 299HV regulator is a fast acting slam-shut valve which provides overpressure or overpressure and underpressure protection by completely shutting off the flow of gas to the downstream system. The slam-shut module's actions are independent of the Type 299HV main regulator and of the variations to the inlet pressure. The Type VSX8 have internal or external registration. External registration requires a downstream sensing line.

Overpressure Protection

Like most regulators, the Type 299H has outlet pressure ratings lower than the inlet pressure ratings. Complete downstream overpressure protection is needed if the actual inlet pressure exceeds the outlet pressure rating.

Overpressure protection for internal parts is built into the main and pilot diaphragms by means of a small spring on each post. The springs will allow the diaphragm heads to move farther on the posts avoiding damage to or bending of the valve trim.

Overpressuring any portion of a regulator or associated equipment may cause leakage, parts damage or personal injury due to bursting of pressure-containing parts or explosion of accumulated gas. Regulator operation within ratings does not preclude the possibility of damage from external sources or from debris in the pipeline. A regulator should be inspected for damage periodically and after any overpressure condition.

The pilot vent is provided with a 1/4 NPT tapped connection in the spring case.

Installation

Like most regulators, the 299H Series regulators have an outlet pressure rating lower than its inlet pressure rating. Complete downstream overpressure protection is needed if the actual inlet pressure can exceed the regulator outlet pressure rating or the pressure ratings of any downstream equipment. Regulator operation within ratings does not preclude the possibility of damage from external sources or from debris in the lines. A regulator should be inspected for damage periodically and after any overpressure condition.

Clean out all pipelines before installation. Check for damage which might have occurred during shipment. Also, check for and remove any dirt or foreign material which may have accumulated in the regulator body.

Apply pipe compound to the external pipe threads of threaded bodies or use suitable line gaskets and good bolting practices with a flanged body. This regulator may be installed in any position desired as long as the flow through the body is in the direction indicated by the arrow on the body. Install a three-valve bypass around the regulator if continuous operation is necessary during maintenance or inspection.

Although the standard orientation of the actuator and pilot to the main valve body is as shown in Figure 1, this orientation may be changed in 90° intervals by rotating the actuator lower casing (key 1, Figure 4) and the elbow fitting (key 19) by 90° and then reinstalling the cap screws.

To keep the pilot spring case from being plugged or the spring case from collecting moisture, corrosive chemicals or other foreign material, the vent must be pointed down oriented to the lowest possible point on the spring case or otherwise protected. Vent orientation may be changed by rotating the pilot spring case with respect to the pilot body.

To remotely vent the pilot, remove the screwed-in vent assembly (key 27, Figure 3) from the pilot spring case and install obstruction-free tubing or piping into the 1/4 NPT vent tapping. Provide protection on a remote vent by installing a screened vent cap into the remote end of the vent pipe.

An upstream pilot supply line is not required because of the integral pilot supply tubing (key 21, Figure 4). However, as long as the 1/4 NPT tapping in the main valve body is plugged, this tubing may be disconnected from the main valve (key 17) in order to install a pilot supply line from a desired remote location into the pilot.

If using a control line, attach the control line from the pilot tap 2 to 3 ft. / 0.61 to 0.91 m downstream of the regulator in a straight run of pipe. If impossible to comply with this recommendation due to the pipe arrangement, it may be better to make the control line tap nearer the regulator outlet rather than downstream of a block valve. Do not make the tap near any elbow, swage or nipple which might cause turbulence. For optimal performance, use as large of a control line as practical.

In many instances, it will be necessary to enlarge the downstream piping to keep flow velocities within good engineering practices. Expand the piping as close to the regulator outlet as possible.

Each regulator is factory-set for the pressure setting specified on the order. If no setting was specified, the outlet pressure is set midrange of the pilot control spring. In all cases, check the control spring setting to make sure it is correct for the application.

Registration Conversion

To convert the 299H Series regulators from one type of registration to another, all that is required is adding or removing screws and O-rings.

To change an internal registration regulator to an external registration regulator with a downstream control line, block the two ports in the throat with screws and O-rings (J in Figure 2). Remove either the 3/4 NPT pipe plug in the pilot casing or the 3/4 NPT pipe plug in the lower casing and add a downstream control line.

To convert an external registration regulator to a dual registration regulator, remove the two screws and O-rings (J in Figure 2) from the throat and use a screw and an O-ring to block the port (G in Figure 2) between the lower diaphragm chamber and pilot diaphragm chamber. Remove the 3/4 NPT pipe plug in the pilot lower casing and add a downstream control line.

Type VSX8 Slam-Shut Device

Refer to the Instruction Manual for Type VSX8 Slam-shut, document D103127X012, for Adjustment and Maintenance of the Slam-shut.

Type VSX8 Installation Startup

With proper installation completed and downstream equipment properly adjusted, perform the following procedure while monitoring the pressure with gauges.

1. Very slowly open the upstream block valve.
2. On a Type 299HV, the Type VSX8 is shipped in the tripped position and will need to be reset. If the Type VSX8 is OPSO only, it can be reset before starting the regulator. If the Type VSX8 is OPSO/UPSO, the regulator will need to be started and the downstream system pressurized before the Type VSX8 can be reset. See the section for Type VSX8 reset.
3. Use the following procedure to reset the Type VSX8:
   1. To properly reset the Type VSX8 slam shut after it has been tripped to the closed position, a flat-head screwdriver must be inserted into the backside of the reset button.
   2. The screwdriver should be slowly rotated to gradually pull the reset button away from the Type VSX8 device. This slow movement allows for a slow bleed of the pressure across the Type VSX8 slam shut's disk and seat area. The operator should be able to hear the pressure bleeding through the system.
   3. When the pressure has equalized and the air bleeding sound has dissipated, the reset button should be pulled completely away from the Type VSX8 slam shut device by hand until the internal shut-off mechanism has been re-latched.
   4. Once the operator feels the click of the re-latch occurring, the reset button should be pushed completely back into its original position.
4. Slowly open the hand valve (if used) in the control line. The regulator will control downstream pressure at the pilot control spring setting. See the Adjustment section following these numbered steps if changes in the setting are necessary during the start-up procedure.
5. Slowly open the downstream block valve.
6. Slowly close the bypass valve, if used.
7. Check all connections for leaks.

299H Series Adjustment

Keys are referenced in Figure 5. The only adjustment on a 299H Series regulator is the reduced pressure setting of the pilot control spring (key 32). Remove the closing cap (key 29) and turn the adjusting screw (key 36). Turning the adjusting screw clockwise into the spring case increases the controlled or reduced pressure setting. Turning the screw counterclockwise decreases the reduced pressure setting. Always tighten the locknut (key 35) and replace the closing cap after making adjustments.

Shutdown

Installation arrangements may vary, but in any installation it is important to open and close valves slowly and the outlet pressure be vented before venting inlet pressure to prevent damage caused by reverse pressurization of the regulator. Isolate the regulator from the system. Vent the downstream pressure; then vent inlet pressure to release any remaining pressure in the regulator.

Maintenance

Regulator parts are subject to normal wear and must be inspected periodically and replaced as necessary. The frequency of inspection and replacement depends upon the severity of service conditions and upon applicable codes and government regulations.

Due to the care Emerson takes in meeting all manufacturing requirements (heat treating, dimensional tolerances, etc.), use only replacement parts manufactured or furnished by Emerson.

On reassembly of the regulator, it is recommended that a good quality pipe thread sealant be applied to pressure connections and fittings and a good quality lubricant be applied to all O-rings. Also apply an anti-seize compound to the adjusting screw threads and other areas as needed.

Main Actuator Diaphragm

Follow this procedure to change the actuator diaphragm or to inspect, clean or replace any other parts in the main actuator. Part key numbers are referenced in Figures 3 and 4.

1. Cut the wire seal (key 68) (being careful not to lose the warning tag) and remove the closing cap (key 3). Inspect the O-ring (key 9) and replace if necessary.
2. Carefully loosen and remove the double nuts (key 5) on the actuator diaphragm post (key 10). When removing the adjusting nuts, do not twist or unscrew the diaphragm post, as this action will loosen the joint between the diaphragm post and the pusher post (keys 10 and 11).
3. Remove the spring seat (key 4) and closing spring (key 6).
4. Remove the eight hex head cap screws (key 23) and lift off the upper casing (key 2).
5. Remove the diaphragm assembly (key 8) by tipping it so that the lever (key 26) slips out of the pusher post (key 11).
6. Separate the diaphragm assembly by unscrewing the diaphragm post (key 10) from the pusher post (key 11) and remove the diaphragm post, pressure equalization spring (key 7), diaphragm head (key 81), diaphragm (key 8), the second diaphragm head (key 81) and diaphragm pad (key 80). Inspect the diaphragm parts for damage and replace if necessary.
7. Inspect the lever (key 26) and replace if necessary. To replace the valve stem (key 16), also perform Main Body Valve Disk and Orifice maintenance procedure steps 1, 2 and 3, remove disk (key 13) and pull the stem out of the lower casing assembly (key 1). Lightly lubricate the replacement stem O-ring (key 14) and install it on the valve stem. Reinstall the valve stem into the lower casing assembly. Reinstall the body (key 17) or continue with the reassembly of the diaphragm.

8. Loosely reassemble the diaphragm and diaphragm post parts so that the bolt holes in the diaphragm align with the corresponding holes in the lower casing (key 1) when the lever (key 26) is fitted properly into the pusher post. When this orientation is made, tighten the diaphragm post into the pusher post (keys 10 and 11).
9. Reinstall the diaphragm assembly using the reverse order of step 5.
10. Install the upper casing (key 2) and secure it to the lower casing (key 1) with the eight hex head screws (key 23). Tighten the hex head screws evenly using a crisscross pattern to avoid placing an uneven strain on the regulator. Tighten the screws to a final bolt torque of 10 to 13 ft-lbs / 13 to 17 N•m to avoid crushing the diaphragm.

11. Install the closing spring (key 6) and the spring seat (key 4). Push and hold down on the spring seat, cocking it to one side until the seat catches onto the threads of the diaphragm post (key 10). Then, pull up on the diaphragm post allowing access to the post threads so that the two adjusting hex nuts (key 5) can be installed. Install the adjusting hex nuts as shown in Figure 3. The closing spring must be adjusted down to a depth of 1/2 in. / 13 mm from the top of the upper case opening to the top of the spring seat. When tightening the two hex nuts, use care not to rotate the diaphragm post, which may damage the post.
12. Lightly lubricate the O-ring (key 9) on the closing cap and reinstall the closing cap (key 3).

13. Install the wire seal and warning tag (keys 68 and 69).

Main Body Valve Disk and Orifice

Follow this procedure to inspect, clean or replace the main body valve disk or to inspect or replace the orifice. Part key numbers are referenced in Figures 3 and 4.

1. Disconnect the pilot supply tubing (key 21) from the main body (key 17).
2. Remove the two hex head cap screws (key 18) which hold the lower casing (key 1) to the body. Separate the lower casing from the body. Inspect the body O-ring (key 15) and replace if worn or damaged.
3. Examine the valve disk (key 13) and orifice (key 12) for nicks, cuts and other damage. Unscrew the disk holder assembly from the valve stem assembly (key 16) and replace it with a new part if necessary. For the Type 299HV, also examine the insert and O-ring (keys 82 and 83, Figure 6) for any damage. Replace if needed.
4. If the orifice is being replaced with a new or differently sized orifice, change the nameplate (key 63) to state the new size and maximum inlet pressure. Lubricate the threads and flat face of the orifice with a good grade of anti-seize lubricant. Install the orifice using 100 to 120 ft-lbs / 136 to 163 N•m of torque.
5. After replacing all damaged parts, slide the entire assembly into the valve body (key 17) and secure with the two hex head cap screws (key 18).
6. Connect the pilot supply tubing (key 21), then refer to the Startup section for putting the regulator into operation.

Integral Pilot Valve Disk and Orifice

Follow this procedure to inspect, clean or replace the integral pilot valve disk or orifice. Part key numbers are referenced in Figures 3 and 4.

1. Remove or loosen the pilot supply tubing (key 21).
2. Remove the inlet fitting (key 47) and the four machine screws (key 46).
3. Examine the valve disk (key 52) for nicks, cuts and other damage. Unscrew the disk holder assembly from the valve stem (key 48) and replace if necessary.
4. If the seating edge of the orifice (key 50) is nicked or rough, use a thin-walled socket to remove the orifice from the inlet fitting (key 47). Install a new orifice and a lightly lubricated O-ring (key 49) when reassembling the regulator.
5. Inspect the check valve assembly (key 45) and the bleed restriction (key 70) for damage and replace if necessary.
6. The Type 299H has a wire inlet screen (key 51) in the pilot supply inlet fitting (key 47). If clogging is suspected in the pilot supply, remove the elbow fitting (key 19) and clean the wire screen.
7. Lightly lubricate the O-ring (key 54) on the inlet fitting (key 47) and reinstall using the four machine screws (key 46). Torque the machine screws to 30 to 40 in-lbs / 3.4 to 4.5 N•m. Then install and tighten the pilot supply tubing.

Integral Pilot Control Spring and Diaphragm

Follow this procedure to change the pilot control spring or to inspect, clean or replace the diaphragm. Part key numbers are referenced in Figures 3, 4 and 5.

1. Remove the pilot closing cap (key 29) and loosen the hex lock nut (key 35). Turn the adjusting screw (key 36) counterclockwise to ease spring compression.
2. Unscrew the bonnet (key 34).
3. Remove the bonnet (key 34), spring seat (key 33) and control spring (key 32).
4. If only replacing the control spring (key 32), sparingly apply lubricant to the control spring seat (key 33) and reassemble in the reverse order.

5. Remove the machine screws (key 30) and spring case (key 31) from the lower casing (key 1).
6. Remove the diaphragm assembly (key 28) by tilting them so that the pusher post (key 40) slips off the lever (key 57). To separate the diaphragm from the attached parts, unscrew the hex nut (key 37) and separate the parts: washer (key 38), diaphragm post (key 39), pusher post (key 40), overtravel spring (key 41), machine screw (key 42), spring seat (key 88) (Types 299HR and 299HVR), rivet (key 43) and retaining ring (key 44).
7. To replace the lever assembly (key 57), remove the lever pin (key 25). To replace the valve stem (key 48), also perform Integral Pilot Valve Disk and Orifice maintenance procedure steps 1, 2 and 3 and pull the stem (key 48) out of the lower casing assembly (key 1). Lightly lubricate the replacement stem O-ring (key 53) and install it on the valve stem.
8. Install the valve stem (key 48) into the lower casing assembly (key 1). Be careful not to cut the O-ring (key 53) when sliding the valve stem into the lower casing.
9. Reinstall the diaphragm (key 28) assembly using the reverse order of step 6.
10. Place the spring case (key 31) on the lower casing (key 1) with the vent (key 27) oriented downwards to prevent clogging or entrance or moisture. Install the machine screws (key 30) and tighten in a crisscross pattern using 12 to 18 in-lbs / 1.4 to 2.0 N•m of torque.
11. When all maintenance is complete, refer to the Startup section to put the regulator back into operation and adjust the pressure setting. Tighten the locknut (key 35) and install the closing cap (key 29).

Figure 3. 299H Series Interior Assembly: This figure illustrates the internal components and assembly details for 299H Series regulators, focusing on spring seat installation and pressure registration types. It indicates points for applying multi-purpose lubricant (L1) and multi-purpose PTFE thread sealant (S1).

Locking Down the Spring Seat

A diagram shows the hex nuts, spring seat, upper spring case, closing spring, and diaphragm post. It emphasizes applying constant hand pressure to lock down the spring seat to facilitate installing the hex nuts.

External Registration Schematic

An exploded view shows the main regulator body with external connections. Key components highlighted include: 61 (O-ring, Nitrile (NBR)), 25 (Lever Pin), 27 (Vent Hood), 56 (Screw, Steel), 24 (Machine Screw), 26 (Lever). The diagram indicates a connection for external registration and points where lubricant (L1) should be applied.

Internal Registration Schematic

Similar to the external registration view, but showing components specific to internal registration. Key components include: 25 (Lever Pin), 26 (Lever), 24 (Machine Screw), 59 (Pipe Plug, Internal Registration only), 27 (Vent Hood). The diagram indicates where thread sealant (S1) should be applied for internal registration.

Figure 4. 299H Series Exterior Assembly: This figure provides an exterior view of the 299H Series regulator, highlighting various connections and components. It indicates points for applying anti-seize compound (L2) and multi-purpose PTFE thread sealant (S1).

The main regulator body is shown with the upper casing (2), lower casing (1), and closing cap (3). Key external components and connections include: 69 (Warning Tag), 68 (Wire Seal), 63 (Nameplate), 62 (Drive Screw), 19 (Elbow), 22 (Loading Tubing), 46 (Machine Screw), 20 (Connector), 58 (Pipe Plug), 47 (Inlet Fitting), 21 (Pilot Supply Tubing), 29 (Pilot Closing Cap), 30 (Machine Screw), 31 (Spring Case), 89 (Label).

Tubing and Fittings with Optional Type P590 Filter

This view shows the regulator with an optional P590 filter integrated into the pilot supply tubing. Key components include: 78 (Pilot Supply Tubing, Long), 20 (Connector), 72 (Filter Assembly), 79 (Pilot Supply Tubing, Short). Thread sealant (S1) application points are indicated.

Tubing and Fittings with Optional Type 67CF Pilot Supply Regulator

This view shows the regulator with an optional Type 67CF pilot supply regulator integrated into the pilot supply tubing. Key components include: 78 (Pilot Supply Tubing, Long), 20 (Connector), 76 (Type 67CF Pilot Supply Regulator), 79 (Pilot Supply Tubing, Short). Thread sealant (S1) application points are indicated.

Figure 5. 299H Series Pilot Assemblies: This figure illustrates the internal components of the pilot assemblies for both the 299H and 299HR types, indicating points for applying anti-seize compound (L2) and adhesive (A).

Type 299H Pilot Without Relief Valve

This schematic shows the pilot assembly without a token relief valve. Key components include: 40 (Pusher Post), 43 (Rivet), 44 (Retaining Ring), 39 (Diaphragm Post), 42 (Machine Screw), 41 (Overtravel Spring), 38 (Washer), 28 (Diaphragm Assembly), 37 (Hex Nut), 32 (Control Spring), 33 (Spring Seat), 29 (Pilot Closing Cap), 34 (Bonnet), 35 (Locknut), 36 (Adjusting Screw). The diaphragm assembly (28) is connected to the pusher post (40) and diaphragm post (39). The control spring (32) is compressed by the adjusting screw (36) within the bonnet (34) and closing cap (29).

Type 299HR Pilot With Token Relief Valve

This schematic is similar to the 299H pilot but includes components for the token relief valve. Additional key components shown are: 88 (Spring Seat, Type 299HR). The overall structure and function are similar, with the token relief mechanism integrated into the diaphragm assembly (28) and spring seat (88).

Figure 6. Type 299HV with Type VSX8 Assembly: This figure illustrates the integration of the Type VSX8 slam-shut device with the 299HV regulator. It shows the main regulator body connected to the VSX8 module. Key components highlighted are: 12 (Orifice), 82 (Insert), 83 (O-ring), and 13 (Disk). The diagram emphasizes how the VSX8 assembly connects to the main regulator's valve body, indicating the flow path and the slam-shut mechanism's position relative to the main valve disk and orifice.

Types VSX2 and VSX8 Maintenance

Maintenance instructions for the Type VSX8 slam-shut are found in Instruction Manual D103127X012.

Refer to the Instruction Manual for Type VSX8 Slam-shut, document D103127X012, for Adjustment and Maintenance of the Slam-shut and Reed Switch Operation.

Optional P590 Series Filter

For complete installation, maintenance and parts list refer to the P590 Series Filters Instruction Manual D101555X012.

Optional Type 67CF Pilot Supply Regulator

For complete installation, maintenance and parts list refer to the 67C Series Instruction Manual D102601X012.

Parts Ordering

The type number, orifice size, spring range and date of manufacture are stamped on the nameplate. Provide this information along with the eleven-character part number to your local Sales Office when ordering parts. If construction changes are made in the field, be sure that the nameplate is also changed to reflect the most recent construction.

Parts List

299H Series Regulator (Figures 3, 4 and 5)

* Recommended spare part. Delrin® is a mark owned by E.I. du Pont de Nemours and Co.

1. Cast iron or steel bodies without filter and pilot supply regulator require 1 connector; all other combinations of filter and/or pilot supply regulator require 3 connectors. Ductile iron bodies without filter and pilot supply regulator require 2 connectors; all other combinations of filter and/or pilot supply regulator require 4 connectors.
2. Ductile iron bodies only.
3. Not shown.