The Anti-Siphon Valve is used on above ground storage tanks to prevent spillage and to avoid other potential hazards. In the event a siphon occurs due to a rupture in the product pipe line, the valve will automatically stop the product flow. The valve is a normally closed check valve and will resist hydrostatic head pressure and prevent siphoning. The anti-siphon valve features a rust resistant epoxy coated cast iron body, precision machined bronze seat, Buna-N seals and is also available with a pressure relief valve to relieve thermal expansion (Model 620PR).

NOTE: The hydrostatic head pressure of the siphon is determined by the vertical height of the product in the system. It is usually measured from the top of the tank (highest liquid level) to the lowest point in the line. It is this vertical height that determines the spring pressure for the valve. If head pressure is not specified when ordering, the 0 – 5′ setting will be supplied.