Welker RV-2CP Installation And Maintenance Manual

PRODUCT DESCRIPTION
• Designed for use in place of a
rupture disc to protect Welker®
Constant Pressure Cylinders from
overpressurization.
• Unlike a rupture disc, only relieves
enough pressure needed for it to
reseat, thus limiting the amount of
product discharged.
• Can be vented to a safe location.
• Specifically designed to relieve
low-capacity cylinders in the
0 2000 psig range.
For inquiries regarding relief valve
calculations, please contact
our Service Department:
281.207.1887
SPECIFICATIONS
Materials of Construction
316/316L Stainless Steel, PTFE, FKM
(Others Available)
Maximum Allowable Inlet Pressure
5000 psig ( 344.7 barg )
Temperature Range
(-28.8 °C to 48.8 °C
-20 °F to 120 °F )
Temperature Range Might Vary Based on
Seal Material Selection
Spring Range Options
6.8 137.8 barg
100 psig up to 2000 psig (
Flow Rates
C = .038
V
Full Flow Accomplished at 150% Over Set
Pressure
Connections
Inlet: ½" 20 UNF THD*
Outlet: ¼" FNPT
Approximate Dimensions
2¼" x ¾" x ¾" (L x W x H)
Approximate Weight
¼ lb
Maintenance Schedule
Every 12 Months
Severe Service, Dirty Conditions,
Excessive Usage: More Frequently
Options
Pre-Set Relief
NACE Compliance
*Designed to mate up with Welker®
Constant Pressure Cylinders.
The following procedures have been
written for use with standard Welker® parts
and equipment. Assemblies that have
been modified might have additional
requirements and specifications that are
not listed in this document.
If you received a damaged
RV-2CP Relief Valve,
please contact a Welker®
representative immediately.
For all product inquiries, please
contact our Service Department:
281.207.1887
INSTALLATION, SETTING, TESTING, AND MAINTENANCE MANUAL
The installation, operation, and maintenance liability for this equipment becomes that of the purchaser at the time
of receipt. Reading the instructions that comprise IOM-265 prior to installation and operation of this equipment is
required for a full understanding of its application and performance prior to use.
•
Prior to being set, the RV-2CP must be installed to the cylinder it will be relieving.
•
To accurately set the relief, a safe gas source, regulator, and pressure gauge are needed.
RV-2CP: INSTALLING, SETTING, AND TESTING
Installing the RV-2CP Relief Valve
1. Install the RV-
2. Either wrap the threads of the relief valve with PTFE tape or apply pipe dope to the threads.
3. Install the RV-2CP on top of the seat.
4. Using a torque wrench, tighten the RV-2CP to 30 ft·lbs. The RV-2CP may now be set.
Setting the RV-2CP Relief Valve
5. Connect the regulator to a safe gas source.
6. Using a hex key, screw the RV-
7. Connect from the regulator to the cylinder end cap to which the RV-2CP is installed.
8. Set the regulator to the desired pressure. Then apply auxiliary gas through the regulator to the RV-2CP.
9. Using a hex key, screw the RV-
10. Screw the RV-
)
Testing the RV-2CP Relief Valve
11. Set the regulator to a pressure slightly below the RV-2CP set point. Then slowly increase the outlet pressure of the regulator until
it is slightly higher than the RV-2CP set point. A hissing sound should be audible.
12. Slowly decrease the outlet pressure of the regulator until it is slightly below the RV-2CP set point. The hissing sound should stop
as the RV-2CP reseats.
13. If the RV-2CP does not begin to relieve pressure or does not reseat, it might be necessary to repeat steps 8 10 to reset the RV-2CP.
14. Disconnect the regulator from the cylinder end cap.
15. The RV-2CP is now operational.
Figure 1: Welker®
RV-2CP Relief
Valve Diagram
RV-2CP: MAINTENANCE
New seals supplied in spare parts kits should be lightly lubricated before being installed to ease the installation of
the seals and reduce the risk of damage when positioning them on parts. Wipe excess lubricant from the seals,
because it might adversely affect analytical results.
•
The small O-ring may be picked out with a seal pick, or a small burst of air may be blown through the
opposite end of the spring housing to release the seal.
•
Ensure that the poppet is returned to the spring housing in the correct orientation.
For sample-exposed seals, Welker® recommends non-hydrocarbon-based lubricants such as Krytox®.
For non-sample-exposed seals, Welker® recommends lubricants such as Molykote® 111.
1. Isolate, depressurize, then remove the RV-2CP from the supply source.
2. Using a hex key, remove the spring adjuster, spring, and poppet.
3. Inspect the spring. If the spring is in good condition, it can be reused.
4. Inspect the poppet for nicks and scratches. Replace as necessary.
5. Remove and replace the O-ring on the seat. Then set aside the seat.
6. Remove and replace the small O-ring (see
7. .
WELKER® RV-2CP RELIEF VALVE
IOM-265 | REV. 0 | 02/11/2025
spring adjuster counterclockwise until pressure starts to relieve. A hissing sound will be audible.
adjuster clockwise until the hissing sound stops and the RV-2CP obtains a positive shutoff.
Caution Note
above).
-ring side of the seat must face away from the RV-2CP.
-2CP.
7. Return the poppet and the spring to the spring
housing.
8. Screw the spring adjuster into the spring
housing.
9. Screw the seat assembly into the spring housing.
10. The RV-2CP is now ready to be reinstalled and reset.