white parker logo

The CSR and CSRH Valves employ proven principles of design, these safety relief valves are highly reliable and dependable. The valves are precision machined assure valve opening at the set pressure long after installation.

Parker’s cartridge safety relief valves (CSRV) are designed to offer the highest level of protection while maintaining easy serviceability. The CSRV was designed from the existing Parker SR and SRH safety relief valve housing, which allows for a simple and easy upgrade path to the new cartridge based design. As local or state codes govern the frequency of valve replacement, the CSRV is a cost effective alternative to standard safety relief valve designs.


• Refrigeration Specialties

Features and Benefits:

• Suitable for ammonia and halocarbon refrigerants
• ASME Boiler and Pressure Vessel Code, Section VIII, Division 1 compliant
• ANSI/ASHRAE 15 safety standard for refrigeration systems
• Stainless steel cartridge and internal components
• Same lay in length as SR and SRH series safety relief valves
• Cartridge based design allows for replacement while housing remains in the system
• Non-stick PTFE seat
• Set pressure tolerance of ±3%
• Unaffected by vibration
Function and Design:
• Safety relief valves are used to protect against or limit pressure build up in refrigeration systems, vessels or compressors caused by a process upset or equipment failure.
• The cartridge safety relief valve (CSR) and high capacity cartridge safety relief valve (CSRH) are intended to prevent the pressure of the vessel from rising more than 10% above the designed working pressure (DWP) of the vessel or the pressure setting of the relief device, whichever is the lower pressure.


• Compressor Packages
• Accumulator Vessels
• Anywhere else protection from overpressure is required

Minimum Operating Temperature (C)


Minimum Operating Temperature (F)


Maximum Operating Temperature (C)


Maximum Operating Temperature (F)


Minimum Ambient Temperature (C)


Minimum Ambient Temperature (F)


Maximum Ambient Temperature (C)


Maximum Ambient Temperature (F)


Pressure Relief Setting (barg)

10.3 to 27.6 barg

Pressure Relief Setting (psig)

150 to 400 psig

Maximum Working Pressure (Bar)

27.6 bar

Maximum Working Pressure (psig)

400 psig



Valve Type

CSR1 thru CSR4, CSRH1 thru CSRH5

Valve Materials

External: Cast Iron, Internal: Stainless Steel, Seat: PTFE

Inlet Connection

1/2″ to 1 1/4″

Outlet Connection

3/4″ to 1 1/2″

Orifice Size (mm)


Orifice Size (inch)


Flow Capacity (SCFM Air)

37 to 1173

Flow Capacity (Lbs. Per Min Air)

10 to 2142


Vapor Only