Sentinel Pressure Relief Valves

Protect pumping systems from pressure damage with SENTINEL Diaphragm Pressure Relief Valves.
Diaphragm pressure relief valves are designed to protect pumping systems from over pressure damage caused by defective equipment or blockage in the pump system line. Robust construction ensures reliability in the rigorous service of municipal and industrial applications.

Reliability and low cost
Compact size for OEM applications
Adjustable 5-150 psi for standard, 5-50 psi low pressure, or 50-350 psi high pressure
3 port, 2 port and 90° configuration
Robust machined construction
Vulcanized PTFE/EPDM diaphragm
Full range of chemically resistant wetted materials
Sizes from ¼” to 4” depending on model

Diaphragm pressure relief valves operate when the pressure in the pumping system exceeds the preset pressure of the valve. The diaphragm is held against the valve seat by an internal spring. When the preset pressure is exceeded the diaphragm is forced up and the system fluid flows out the relief port, back to the system fluid tank or to the suction side of the pump. The valves are pre-set at 50 psi, however they are field adjustable from 5 to 150 psi, (optional up to 350 psi for high pressure) via the adjustment screw. The relief valve should be set approximately 15 psi higher than the system pressure. Installation should be made as close to the pump as possible, without any valves or accessories between the relief valve and the pump. Consult your pump manufacturer for recommendations.