Welker RV-2 Manual

PRODUCT DESCRIPTION
• Designed to protect instruments
and regulators from
overpressurization.
• Specifically designed to relieve
low-capacity instruments 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, FFKM, FKM
(Others Available)
Maximum Allowable Inlet Pressure
5000 psig ( 344.7 barg )
Temperature Range
-20 °F to 120 °F (-28.8 °C to 48.8 °C )
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: ¼" MNPT
Outlet: Atmospheric, ¼" MNPT
Approximate Dimensions
3¼" x ¾" x ¾" (L x W x H)
Approximate Weight
½ lb
Maintenance Schedule
Every 12 Months
Severe Service, Dirty Conditions,
Excessive Usage: More Frequently
Options
Pre-Set Relief
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-2 Relief Valve,
please contact a Welker®
representative immediately.
For all product inquiries, please
contact our Service Department:
281.207.1887
SETTING, TESTING, INSTALLATION, 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-264 prior to installation and operation of this equipment is
required for a full understanding of its application and performance prior to use.
To accurately set and test the RV-2 Relief Valve, a safe gas source, regulator, and pressure gauge are needed.
RV-2: SETTING, TESTING, AND INSTALLATION
Setting the RV-2 Relief Valve
1. Connect the regulator to a safe gas source.
2. Screw the spring adjuster (
3. Install the relief valve to the regulator.
4. Set the regulator to the desired pressure. Then apply auxiliary gas through the regulator to the relief valve.
5. Use a hex key to screw the RV-2 spring adjuster counterclockwise until pressure starts to relieve. A hissing sound will be audible.
6. Screw the RV-2
Testing the RV-2 Relief Valve
)
7. Set the regulator to a pressure slightly below the relief valve set point. Then slowly increase the outlet pressure of the regulator
until it is slightly higher than the relief valve set point. A hissing sound should be audible.
8. Slowly decrease the outlet pressure of the regulator until it is slightly below the relief valve set point. The hissing sound should
stop as the relief valve reseats.
9. If the relief valve does not begin to relieve pressure or does not reseat, it might be necessary to repeat steps 4 6 to reset the
relief valve.
10. If the relief valve is to be used with the regulator it was set with, reset the regulator to the desired point.
Installing the RV-2 Relief Valve
11. Either wrap the threads of the relief valve with PTFE tape or apply pipe dope to the threads.
12. Using a wrench, install the relief valve to the correct port on the instrument it will be relieving.
13. Installation is complete and the RV-2 is now operational.
Figure 1: Welker® RV-2 Relief Valve Diagram
RV-2: 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, 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 and depressurize the RV-2 from the supply source.
2. Remove the RV-2 from the supply.
3. Using a hex key, remove the spring adjuster, spring, and poppet.
4. Inspect the spring. If the spring is in good condition, it can be reused.
5. Inspect the poppet for nicks and scratches. Replace as necessary.
6. Unscrew the base from the spring housing. Then replace the O-ring
that is on the base.
WELKER® RV-2 RELIEF VALVE
IOM-264 | REV. 0 | 02/11/2025
Figure 1
) of the relief valve clockwise to fully close the relief valve.
7. Remove and replace the small O-ring at the base
side of the spring housing (see Caution Note
8. Screw the base into the spring housing.
9. Return the poppet and spring to the spring
Caution Note
housing (see above).
10. Screw the spring adjuster into the spring body.
11. The RV-2 is now ready to be reset and reinstalled.
above).