Jordan Valve Mark 128PQC User Manual

I & M Mark 128PQC Series

3170 Wasson Road • Cincinnati, OH 45209 Phone 513.533.5600 • Fax 513.871.0105 (f) info@richardsind.com • www.jordanvalve.com

Warning: Jordan Valve Control Valves must only be used, installed and repaired in accordance with these Installation & Maintenance Instructions. Observe all applicable public and company codes and regulations. In the event of leakage or other malfunction, call a qualiﬁed service person; continued operation may cause system failure or a general hazard. Before servicing any valve, disconnect, shut off, or bypass all pressurized ﬂuid. Before disassembling a valve, be sure to release all spring tension.

InstallatIon

Warning:

Service conditions must not exceed the limits shown on the valve nameplate, or those outlined in this manual. Consequences could include bursting of pressure-retaining parts and uncontrolled process ﬂuid, resulting in personal injury or property damage. Control valves should also be protected from external damages.

Prior to installing the Mark 128PQC Series Control Valve, perform a complete inspection for damage, and remove any foreign debris. Position the valve for desired ﬂow direction. If angle ﬂow is required, switch the pipe plug to left-hand connection. (Figure 2)

Installation & Maintenance Instructions for the

Mark128PQC Series Control Valves

The versatility of this valve allows for installation in any orientation, with the standard method being with the actuator above the body. Standard orientation is best when an angle body or angle conﬁguration has been speciﬁed.

When installing the valve into the line, accepted piping practices must be used. A three-valve bypass should be used if continuous operation is required during inspection or maintenance.

For a fail-close control valve, connect the input signal line into the 1/4-inch NPT actuator connection (Figure

1) in the lower diaphragm case assembly. The input signal pressure line should be installed in the upper diaphragm case assembly of a fail-open control valve.

1/4 INCH NPT PRESSURE CONNECTION

LEAKOFF VENTS

Mark 128PQC Control Valve with Fail-Close Action

Figure 1: Mark 128PQC Control Valve Typical Constructions

Detail of Mark 128PQC Exterior

Mark 128PQC SerieS Control ValVe

MaIntenance

Warning:

Prior to performing any maintenance, isolate the valve from the process pressure. Vent control input signal pressure. Relieve the process pressure and drain process media from both sides of valve (Figure 5, Key 27). A sudden release of pressure or ﬂuid can cause personal injury or property damage.

Scheduled inspections and maintenance are vital to continued operation of all pressure control valves and systems. Parts are subject to wear and tear, and must be replaced as necessary, depending on the intensity of service conditions. Unless the valve body requires maintenance or replacement, it may remain in the pressure system or on the vessel.

Table 1: Maximum Allowable Shutoff Pressure Drops

Cadmium Coloured Main Spring

At 20 Psig (1.4

bar) Operating

Seating

Metal

(All Types)

Soft

Actuator

Action

Fail Close

Fail

Open

Fail Close

Fail

Open

Flowing

Pressure

Drop

Tends

To:

Open Valve

Valve

Open

Valve

valve

Port Diameter

ln mm

1/4 6.4 1510 104 3370 232 3880 233 3600 248

3/8 9.5 520 36 1340 92 1340 92 3120 215

1/2 12.7 220 15 690 47 700 48 1720 118

3/4 19.1 30 2.1 240 16 240 16 710 49

1/4 6.4 940 65 1860 128 1370 94 2920 201

3/8 9.5 1130 78 2450 169 1540 106 3300 227

1/2 12.7 1330 92 2920 201 1710 118 3600 248

3/4 19.1 2030 140 3600 248 2320 160 3600 248

1/4 6.4 170 12 350 24 --- --- --- ---

3/8 9.5 530 36 610 42 --- --- --- ---

1/2 12.7 540 37 1150 79 --- --- --- ---

3/4 19.1 1400 96 2910 200 --- --- --- ---

1/4 6.4 1000 69 1000 69 1000 69 1000 69

3/8 9.5 710 49 1000 69 1000 69 1000 69

1/2 12.7 400 28 830 57 830 57 1000 69

3/4** 19.1** 160 11 350 24 360 25 790 54

1/4 6.4 940 65 1000 69 1000 69 1000 69

3/8 9.5 1000 69 1000 69 1000 69 1000 69

1/2 12.7 1000 69 1000 69 1000 69 1000 69

3/4** 19.1** 1000 69 1000 69 1000 69 1000 69

1/4 6.4 560 39 660 45 --- --- --- ---

3/8 9.5 480 33 960 66 --- --- --- ---

1/2 12.7 540 37 1000 69 --- --- --- ---

3/4*** 19.1** 1000 69 1000 69 --- --- --- ---

Replacing Packing and Trim

Follow these procedures when replacing the entire packing and trim assembly or individually replacing packing and trim parts. Unless otherwise indicated, key numbers in this section reference Table 2 for parts listings for replacement packing and trim assembly, Figure 2 for packing and trim assembly key numbers and Figure 4 control valve assembly key numbers.

1. Detach the control valve from all pressure, and release pressure from valve body and actuator. Ensure the valve is completely closed.

2. Remove the four nuts (Key 32) from the screws of the lower diaphragm casing. After discon necting the input signal tubing, remove the actuator from the valve body, along with at tached trim parts.

14A8831X012 Red Main Spring 14A9077X012

At 35 Psig (2.4

Signal

Pressure

(2 Springs

Req’d)

Psi Bar Psi Bar Psi Bar Psi Bar

bar) Operating

Signal

Pressure

(4 Springs

Req’d)

At 20 Psig (1.4 bar) Operating

Signal

Pressure

(2 Springs

Req’d)

At 35 Psig (2.4 bar) Operating

Signal

Pressure

(4 Springs

Req’d)

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Mark 128PQC SerieS Control ValVe

Replacing Packing and Trim continued,

3. Accessible areas should be cleaned at this stage, and all necessary maintenance perf ormed. The actuator and attached trim parts can be turned over and held by the valve body.

4. To separate trim and access packing parts or seal O-rings, ﬁrst loosen and remove the valve plug (Key 25) and remove the packing box washer (Key 27).

5. Remove the packing box (Key 28), O-ring retainer (Key 18), stem O-ring (Key 19) and diaphragm casing O-ring (Key 31) off the stem.

6. Install replacement parts as necessary.

6.1. If a complete packing and trim assem bly is being installed, remove the as sembly from the tube (Key 37), keepi ng the web sleeve (Key 39) on the assembly so the parts remain in place. Roll the sleeve back as necessary dur ing installation.

6.2. Continue pushing the assembly onto the stem until the valve plug and cage are pushed away from the packing box washer or wiper ring. Roll the web sleeve back into place just past the packing box.

6.3. If installing nitrile/cotton packing, the packing rings may be lubricated with silicon based product.

7. Slide the packing box onto the stem until the packing box, the O-ring (Key 19) and the O ring retainer (Key 18) and the diaphragm casi ng O-ring (Key 31) are sealed against the dia phragm casing.

7.1. Ensuring proper positioning of the O rings will prevent them from being cut when other parts are compressed against them.

7.2. Advance the packing spring washer (Key 29) , packing spring (Key 21), second packing spring washer, wiper ring and packing box washer (Key 27, if included in the assembly) down onto the stem.

8. For installation of the packing and trim as sembly, it is necessary to remove the sleeve, cage puller (Key 40) and cage (Key 23) from the valve plug depending on individual valve conﬁguration.

9. Fix the valve plug onto the stem, rotating the plug until the shoulder makes snug contact with the stem. No further tightening is neces sary.

10. To replace the cage or access the cage O-ring (Key 22), remove the cage from the body (Key

26) using the cage puller or a wire hook. Re placement parts can be installed as necessary.

11. Attach the actuator and trim to the valve body (Key 26), paying special attention to the cage O-ring to prevent damage. Thread the four nuts (Key 32) to the lower diaphragm casing assembly screws. Nuts must be tightened to 15-foot-pounds (20N•m).

12. Reconnect the input signal tubing to the actua tor connection of the appropriate diaphragm casing.

Figure 2: Replacement Packing and Trim Assemblies for Metal Seated Constructions

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