Surge Relief Valves (SRA)

APCO SRA Surge Relief Angle Valves are designed to limit surge pressure and potential damage to the pump system. Pressure surges occur when fluid velocity changes. APCO Surge Relief Valves limit the surge pressure magnitude commonly associated with sudden pump shutdown in fluid piping systems.

The surge relief valve is typically installed downstream of the check or pump control valves on the pump discharge header with the valve inlet connected to the side outlet of a tee and the valve outlet piped to the sump.

The Surge Relief Valve has an elbow style body with a smooth flow area and minimal obstructions for efficient surge relief. It is held normally closed by a compression spring or system of nested springs, and protects the system by opening when the system pressure exceeds the relief pressure setting of the valve disc.

As the disc opens, the surge pressure is spilled and dissipated through the valve. The valve will remain open as long as the system pressure exceeds the valve’s relief pressure setting. The valve will slowly begin to close at an adjustable rate as the surge pressure subsides and the system pressure falls below the valve’s relief pressure setting.