Surge relief angle valves prevent surge damage on lift station

Problem: New freeway construction required an existing lift station to be relocated in the city of Phoenix. The new location was in a hilly part of town with some significant elevation changes that could potentially cause a damaging surge event.

Solution: APCO SRA-3000A surge relief angle valves from DeZURIK were installed on the lift station to prevent line damage from surges that occur when the lift station pumps cycle on and off. The valve is an elbow body-style surge relief valve that is held normally closed by a compression spring or system of nested springs. These valves are designed to prevent damage from water hammer in the system by opening when the system pressure exceeds the set shut-off pressure of the valve disc. As the disc opens, the surge pressure rise that caused it to open 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. The valves are designed with a smooth flow and minimal obstruction to flow for efficient surge relief. The surge valves at this lift station were installed and set to relieve system pressure at 135 psig.

Result: The lift station now discharges into a force main system. DeZURIK PEC eccentric plug valves are used as isolation valves on the lines. The valves continue to perform as designed. 320-259-2000; www.dezurik.com