Asahi/America Inc. has expanded its PVC wafer check valves to include sizes 4 inches, 6 inches, and 8 inches. The new 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. The wafer check valve is available in PVC, 4 inches–12 inches, with EPDM seals and no spring, standard. All 4-inch through 8-inch wafer check valves operate at a maximum pressure of 150 PSI; 10-inch and 12-inch valves at 90 PSI and up to 120 F.