The surge anticipation valve SAV 820E

is designed for installation in a bypass line, prevents harmful pressure surges that can develop in pumping systems during sudden pump stoppage.

Unlike conventional pressure relief valves that open only when a high-pressure surge is encountered, the SAV820E already senses the preliminary stage of the high-pressure surge (pump failure or low-pressure surge) and opens in anticipation of the subsequently returning high-pressure surge. By pre-opening, the SAV820E inhibits the pressure rise before it occurs.

The SAV820E is a self-acting valve with two adjustable* response pressures and adjustable closing behavior. It consists of the main valve with two adjustable pilot valves and a throttle valve. It operates without auxiliary or external energy.

When the upper or lower response pressure is reached, the valve opens. At a pressure between the response pressures, the valve remains closed.