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Surge Relief Valves Globe (SRG) APCO


Technical Information

The Surge Relief Globe Valve (SRG) is a globe body style surge relief valve that is held normally closed by lever(s) and weight(s).


They are available in sizes 2-12" (50-300mm) and have relief pressure settings lower than the angle style surge relief valve. SRG


Valves are available in ductile iron with seats of Acrylonitrile-Butadiene (NBR), Terpolymer of Ethylene Propylene and A Diene (EPDM), and Fluoro Rubber (FKM).


The SRG Surge Relief Globe Valve includes a hydraulic cylinder, flow control valve, and 316 Stainless Steel Oil Reservoir.


Also includes two counterweights on extended shafts on valves 3” and larger.


Globe Surge Relief Valves are designed to prevent damage from water hammer by opening when the system pressure exceeds the set shut-off pressure of the valve disc.


If the system pressure exceeds this setting, the Globe Surge Relief Valve will open immediately to relieve the pressure rise but close slowly as the system pressure returns to normal.


A heavy duty oil dashpot system is externally mounted on the valve to control the rate of closure to prevent or minimize slam. The closing rate is externally and infinitely adjustable.

Size range:
2-12" (50-300mm)


Body styles:
Series 6500A


Pressure range:
to 150 psi (1030 kPa) CWP


Body material:
Ductile iron