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Pressure Rating @ 73 F, Water Full Flow (open): 150 psi, Back Pressure (closed): 75 psi, Maximum Service Temperature 140 F. Temperature Pressure De-ratings Apply. EPDM Seat General Installation Information: Swing check valves are designed for horizontal installations but may be installed in up-flow only vertical position. Check valves MUST be installed with the valve FLOW arrow pointing in the direction of the flow. Do not install valve upside down. Flow velocity should not exceed 5’/sec. Minimum opening pressure less than 0.5 psi.