2700 Series - Process Valve - Pressure Relief Valve

Product Brand: Farris

  • Metal Seat with optional o-ring
  • Balanced design option
  • Flanged option
  • Optional welding nipple and sanitary connections
General Specifications:
Size 1/2” x 1” to 1-1/2” x 2-1/2”
Orifice Areas C (0.068 sq2) to G Orifice (0.573 sq2)
Set Pressure Ranges 15 to 6500 psig (1.0 to 413 barg)
Temperature Ranges -320 to 750°F (-195 to 399°C)
Flange Classes 150# – 2500#
Suitable for Air, Gas, Vapor, Steam & Liquid Service
Materials of Construction Carbon Steel
Stainless Steel
Low/High Temperature Alloy Steels
Hastelloy C
NACE Compliant Materials


  • ASME/NB Section VIII and III for Air, Steam and Water
  • CSA B51 (Canada CRN)
  • ISO 9001- 2008
  • PED 97/23/EC (European Pressure Equipment Directive)
  • ATEX 94/9/EC (European Potentially Explosive Atmospheres)
  • CSQL (China)
  • GOST-R (Russian)
  • US Coast Guard
  • Nuclear – 10 CRF 50 Appendix B, NCA-4000, NQA-1 N285.0
  • First Point Assessment Limited


What does a pressure relief valve do?

Air pressure relief valves, also known as PRVs or safety release valves, are installed to prevent pressure buildup. The valve opens slowly to release pressure when the level becomes too high.

Why do I need a pressure relief valve?

If the pressure within an air compressor system gets too high, one of the components inside could explode. Essentially, pressure relief valves are designed to prevent uncontrolled depressurization events from occurring, protecting surrounding nearby equipment and employees during overpressure events.

How does a pressure relief valve work?

Pressure relief valves are often known as safety relief valves and for a good reason. They come with a preset pressure built into their design to ensure once the valve recognizes the pressure limit, it opens to release the pressure-flow (fluid of compressed air) safely.

Where should a pressure relief be located?

It’s advisable to permanently mount pressure relief valves in a vertical position so the spindle sits correctly and can operate effectively. Overtightening the valve can cause damage to the inlet and cause leakage too. For the inlet piping, keep it short and direct, it should have a shorter diameter than the valve, and it should always be far away from turbulence or vibration in the operating system. 

What causes a pressure relief valve to go off?

A pressure relief valve can encounter overpressure or failure for many reasons, but the most common reasons are typically blocked discharge in the system, contaminants like dirt, rust, or sludge, or even valve misalignment can cause the pressure relief valve to fail. Maintenance and proper inspection periodically can help eliminate leakages, allowing a safe environment for operation and the operators.  

2700 Series - Process Valve - Pressure Relief Valve
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