601 Series Wafer Check Valves, 2-1/2 in. to 12 in. Sizes

The 601 Series Wafer Check Valve is a single-disc, non-return valve engineered for thermoplastic piping systems where installation space is limited and reliable backflow prevention is essential. Built from PVC Type I with EPDM O-ring seals and a 316 stainless steel spring, this valve installs between standard flanges without spacers and performs in both horizontal and vertical piping orientations. The 601 Series covers 2-1/2" through 12", split across two product lines: the 601N for sizes 2-1/2" through 8", and the 601NP for sizes 10" and 12". Both share the same core materials and wafer-style body conforming to ASME/ANSI B16.1 Class 150 face-to-face dimensions. Materials are NSF-61 certified for potable water applications. Features: Compact wafer body fits tight installations without a spacer between PVC Schedule 80 flanges Single-disc design rated for horizontal and vertical piping 316 stainless steel spring dampens disc movement to prevent water hammer and extend service life - spring is removable if desired Full vacuum rating of 29.9 Hg (inches mercury) Serviceable design with repair parts and replacement O-rings available NSF-61 certified materials suitable for potable water use Recommended for industrial process piping, commercial pools and water parks, aquaculture, aquarium and zoo support systems, marine and saltwater applications, and water and wastewater treatment Specifications: 601N - Sizes 2-1/2 in. through 8 in. Working pressure: 150 psi non-shock water at 73°F Cracking pressure: 0.5 psi O-ring seal: EPDM PVC locating ears included for proper flange alignment Pressure ratings should be derated for elevated process temperatures 601NP - Sizes 10 in. and 12 in. Working pressure: 87 psi non-shock water at 73°F Cracking pressure: 0.30 psi O-ring seal: EPDM Gaskets included for installation between Class 150 flanges Pressure ratings should be derated for elevated process temperatures