Asahi/America, Inc.’s wafer check valves are installed on the discharge side of pumps in applications such as aquariums, water attractions, water treatment systems, and municipalities to prevent back-flow flooding that could seriously damage pump systems. The wafer check valve’s body, disc and stopper assembly are machined from solid PVC plate stock, which conforms to ASTM D1784 Cell Classification 12454A. The wafer check valve conforms to ISO 5752 face-to-face dimensions and is installed by slip-fitting the valve between two mating flanges. The valve body automatically centers on the mating flanges, once the stud pack is installed. A directional flow arrow on the valve body indicates the upstream and downstream sides of the valve. The lack of a bolt pattern allows one valve style to accommodate ANSI/DIN/JIS mating flange dimensions. The design of the disc and stopper permits the disc to fully open when upstream flow is present, without interfering with schedule piping and mating flanges. In vertical applications, minimal backpressure provides a positive shut-off tight seal. In horizontal applications, an E-CTFE-coated stainless steel spring pulls the disc back to the closed position, with minimal backpressure required to fully shut off. A high Cv value allows user flowrates to be achieved. The wafer check valve is available in PVC, 10-inch and 12-inch, with EPDM seals and no spring, standard. Both size wafer check valves operate at a maximum pressure of 90 PSI and up to 120 F. Optional seals in FKM and an E-CTFE-coated stainless steel are also available.