APCO Surge Relief Angle Valves prevent damage from water hammer by opening when system pressure exceeds the set shut-off pressure of the valve disc. The elbow body style valve is held normally closed by a compression spring or system of nested springs. As the disc opens, the surge pressure rise is spilled and dissipated through the open valve. When system pressure drops below the set shut-off pressure, the valve disc slowly closes against the oil contained in the cushion chamber and cylinder.
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