Pressure relief valves




Griffco diaphragm pressure relief valves have been designed to protect chemical feed systems from overpressure damage caused by defective equipment or blockages. Robust construction ensures reliability even in the most demanding industrial applications.

The spring-loaded valve’s threshold pressure for opening has been preset at 3.4 bar, and the adjustment range is 0.7—10 bar. The mid-pressure range models allow pressure adjustments between 3.4—24 bar.

The recommended standard setting is approx. 1 bar above the system pressure with the valve installed as close to the pump as possible.

Griffco relief valves apply a spring-loaded PTFE/EPDM diaphragm. Valve body materials can be selected according to process chemicals and conditions. These include the metal 316 SS, Alloy 20 and Hastelloy C as well as the plastic PTFE, PP, PVDF, PVC and CPVC.

Standard connections available are the threaded BSP and NPT. Optionally, valves come with ANSI or DIN flanges. The relief valves’ size classes range between 1/4”—2”.