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A 685 poppet check valve with Hastelloy spring. Made of glass-filled polypropylene. The cracking pressure is 12 PSI.
685 Series poppet check valves incorporate a thin elastomer disc supported by a poppet that seals on the seat. Pressure in the flow direction moves the seal off the seat at about 12 psi then moves the poppet away from the seat as the pressure builds.
Specifications: