Welker RV-3 Installation And Maintenance Manual

PRODUCT DESCRIPTION
• Designed to protect instruments
and regulators from
overpressurization.
• Specifically designed to relieve
high-capacity instruments in the
0 200 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
3600 psig ( 248.2 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
0 13.7 barg
Up to 200 psig ( )
Flow Rates
C = 1.18
V
Full Flow Accomplished at 150% Over Set
Pressure
Connections
Inlet: ¼" MNPT (Standard) or ³
Outlet: Atmospheric, ¼" FNPT,
½" FNPT, ¾" FNPT, or 1" FNPT (Standard)
Approximate Dimensions
4½" x 1½" x 1½" (L x W x H)
Approximate Weight
1¼ 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-3 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-266 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-3 Relief Valve, a safe gas source, regulator, and pressure gauge are needed.
RV-3: SETTING, TESTING, AND INSTALLATION
Setting the RV-3 Relief Valve
1. Connect the regulator to a safe gas source.
2. Screw the spring adjuster of the relief valve clockwise to fully close the relief valve.
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 straight-edge screwdriver to screw the RV-3 spring adjuster counterclockwise until pressure starts to relieve. A hissing
sound will be audible.
6. Screw the RV-3
Testing the RV-3 Relief Valve
7. Set the regulator to a pressure slightly below the relief valve set point. Then slowly increase the 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 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-3 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-3 is now operational.
RV-3: 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.
Ensure that the poppet assembly 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-3 from the supply source.
2. Remove the RV-3 from the supply.
3. Using a straight-edge screwdriver, unscrew the spring adjuster, thus
removing the spring adjuster, spring, and poppet assembly from the body.
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 neccesary.
6. Unscrew the poppet pin. Replace the O-ring (
WELKER® RV-3 RELIEF VALVE
IOM-266 | REV. 0 | 02/11/2025
Figure 1
).
Figure 1: Welker®
RV-3 Relief Valve
7. Screw the poppet pin into the poppet body.
8. Return the poppet assembly and spring to the
spring housing. Ensure that the poppet assembly
is returned to the spring housing in the correct
orientation.
9. Screw the spring adjuster into the spring housing.
10. The RV-3 is now ready to be reset and reinstalled.
Diagram