Polypropylene, Viton™ seals, Hastelloy spring, High flow rate, Seat area open diameter: .438″, Positive seal at very low back pressure or slight vacuum, Cracking pressure: 1/3 psi, Max pressure: 125 psi, Max temperature: 140°F, Made in the USA
Greatest Operating Pressure — 125 psi. Most extreme Operating Temperature — 140°F. Seat Area Open Diameter — .438. The 694 Series Check Valve covers a wide scope of air and liquid applications. The 694 Check is a reduced plan with a 1/3 psi breaking weight, high stream rate, and a positive seal at low back weight or slight vacuum.