Welker RV-110V Installation Manual

PRODUCT DESCRIPTION
• Designed to protect instruments
and regulators from
overpressurization.
• Can be used in hazardous and
non-hazardous gas applications
where venting to atmosphere is
acceptable.
• Has a threaded NPT outlet port
when venting of gases to safe
areas is required.
• Designed to ASME standards.
• Has a low set pressure and high
flow capacity while allowing no
leakage from 70% to 90% of the
set pressure.
SPECIFICATIONS
Materials of Construction
316/316L Stainless Steel, FFKM, FKM, PTFE
(Others Available)
Maximum Allowable Inlet Pressure
20 barg
500 psig ( )
Temperature Range
-65 °F to 500 °F (-53 °C to 260 °C )
Spring Range Options
10 250 psig ( 0 17 barg )
Flow Rate
Up to 135 scfm
Connections
Inlet: ¼" FNPT
Outlet: ½" FNPT
Features
10% or 3 psig Overpressurization Relief
Capacity
Adjustable
Lockable
Industry Standards
CE Compliant*
NACE Compliant
*Applies Only When Used on Welker® CE
Equipment
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
Relief Valve,
please contact a Welker®
representative immediately.
For all product inquiries, please
contact our Service Department:
281.207.1879
SETTING, TESTING, AND INSTALLATION 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-259 prior to installation and operation of this equipment is
required for a full understanding of its application and performance prior to use.
To accurately test the RV-110V, a safe gas source, regulator, and pressure gauge are needed.
RV-110V: SETTING, TESTING, AND INSTALLATION
Setting the RV-110V
1. Connect the regulator to a safe gas source.
2. Connect the RV-110V to the regulator outlet.
3.
4. Apply auxiliary gas through the regulator to the RV-110V, and then set the regulator to the desired pressure.
5. Adjust the adjustment screw until a slight hissing sound is audible. This is the crack pressure.
6. Adjust the set pressure accordingly.
7. Once the set pressure has been adjusted, repeat steps 4 6 to confirm the RV-110V has the appropriate set pressure.
8. Tighten the sealing hex nut to lock the adjustment screw into place.
Crack pressure occurs when relief valve inlet pressure is equal to 3 psig below set pressure or 10% below set
pressure whichever is greater (
Testing the RV-110V
9. Set the regulator to a pressure slightly below the RV-110V crack pressure (
pressure until it is at the RV-110V crack pressure. A slight hissing sound should be audible.
10.
the RV-110V reseats.
11. Repeat steps 4 6 to adjust the set pressure if the RV-110V does not relieve pressure or reseat.
12.
opens fully, and a pressure drop should be visible on the pressure gauge.
13. Reset the regulator to a pressure slightly below the crack pressure to verify that the RV-110V will reseat.
14. If the RV-110V is to be used with the regulator it was set with, reset the regulator to the desired point.
Table 1: Pressure Set Point Examples
Start-to-Leak (Crack)
Pressure
Examples (3 psig or 10% Below Set
Pressure, Whichever Is
Greater)
1 17 psig
2 135 psig
Installing the RV-110V
1. First, complete the RV-110V setting and testing instructions.
2. Welker® recommends installing a filter upstream of the RV-110V.
3. If desired, install a customer-supplied adjustment lock wire and/or tag to the RV-110V
adjustment lock wire holes.
4. Wrap the threads of the instrument the RV-110V will be relieving with PTFE tape or
apply pipe dope to the threads.
5. Using a wrench, install the RV-110V to the ¼" MNPT threads on the instrument it will be
relieving.
6. Installation is complete and the RV-110V is now operational.
Table 2: Terms and Definitions
Term
Opening (Set) The opening or set pressure is the equilibrium point
Pressure between the crack pressure and the relieving pressure.
Crack pressure occurs when relief valve inlet pressure is
Start-to-Leak equal to 3 psig below set pressure or 10% below set
(Crack) Pressure pressure whichever is greater. A hissing sound might be
Relieving pressure occurs when relief valve inlet pressure is
Relieving Pressure equal to 3 psig above set pressure or 10% above set
WELKER® RV-110V RELIEF VALVE
IOM-259 | REV. 0 | 01/06/2025
Table 1 and Table 2 ).
Relieving Pressure
Opening (3 psig or 10%
(Set) Above Set Pressure,
Pressure Whichever Is
Greater)
20 psig 23 psig
150 psig 165 psig
Definition
audible.
pressure whichever is greater.
Table 2
).
-110V crack pressure. The hissing sound should stop as
Table 2 ). An audible pop should be heard as the RV-110V
Figure 1: Welker® RV-110V Relief Valve Diagram
-110V.