U.S. Plastic Corporation GF PVC Cone Check Valves Type 561 & 562 20771

GF 561 & 562 valves feature a unique check cone element design that optimizes flow geometry and minimizes flow resistance and pressure loss. The valve closes when vertically mounted with (561) 2.9 psi or (562) 1.45 psi. The check valve Type 562 (horizontal) closes absolutely leak-tight with the built-in spring, even in the de-energized state without water column as well as in a horizontal position. The self-closing mechanism operates autonomously, without any other energy source, i.e. water column or flow (type 562) or with a minimal line pressure (type 561). The streamlined check cone and the refined geometry in every detail provide for a significantly improved flow compared to valves with a check ball, without compromising functionality or leak-tightness. The effort involved in cleaning and servicing the valve has been reduced to a minimum due to the cone design, which offers the least possible contamination surface. With its sealing zone and the specially developed profile seal, the valve is absolutely leak-proof, even when closing very quickly. Maximum temperature of 140F.