5340-250 Henry 1/2 MPT x 3/4 FPT Stainless Steel Straight-Thru Type Relief Valve, 250 PSI

The function of a Pressure Relief Valve is to protect against overpressure. For safety reasons, excessive over-pressure in any part of the refrigeration system must be avoidedHow it worksA conventional PRV is designed to open at a predetermined pressure - the set pressure. A spring exerts a sealing force on a valve seat via a piston seal assembly. At a pressure equal to the set pressure, the piston will start to lift resulting in a small amount of flow through the valve. From this point, the pressure force acting on the piston increases significantly and overcomes the spring force. This imbalance of forces causes the valve to "pop" fully open. By design, the difference in pressure from the valve set point to the fully open condition is no more than 10%. System pressure is controlled/reduced by venting the refrigerant vapour through the valve. The valve then re-closes at a pressure where the spring force overcomes the piston force. Under normal system operating conditions, the pressure at the valve inlet is below the set pressure. Only under abnormal operating conditions should the PRV be open.Main featuresProven safe designCategory IV PED compliantPrecision machined parts for reliabilityHigh flow capacityCompacNon-stick teflon valve sealBlow-out proof seal designSeal material with high chemical resistanceTamper proofTest Certificates available on requestNon-standard pressure settings available on requestMaterials of ConstructionFor the 53 series valves, the main body is made from stainless steel. The outlet connection and valve internals are made from either plated steel or stainless steel.