Excess Flow Valves for Container Service A7537 Series, A7539 Series, A8523 and A8525


Designed for mounting in threaded full or half couplings in container installations. They may be used for filling, withdrawal or vapor equalizing applications. The exceptionally low pressure drop makes them ideal for pump suction lines. If a riser pipe to the vapor space is used with these valves, the minimum inside diameter of the riser pipe must be at least two times the valve thread size in order not to restrict flow to the side inlet ports.


    • Precision machined.
    • Generous flow channels provide low pressure drop minimizing cavitation in pump suction lines.
    • Cotter pin prevents loss of spring retainer due to vibration in service.
    • Stainless steel spring provides consistent closing flow and long service life.
    • Separate models for installation in either half or full couplings


Body Cadmium Plated Steel
Body (A7539 Series Only) Ductile Iron
Seat Disc Cadmium Plated Steel
Stem Stainless Steel
Spring Stainless Steel
Guide Cadmium Plated Steel