The 685 Series Poppet Check Valve offers a compact, high-performance solution for controlling fluid and air flow with precision. Designed with a thin elastomer disc supported by a poppet, it seals reliably even at very low back pressure or vacuum conditions. This valve opens at a light 1/3 psi cracking pressure and features a high flow Cv of 10.2 with 1/2" NPT ends, allowing excellent throughput in a small footprint. With FKM O-rings and 302 stainless steel springs, the 685 Series is ideal for systems requiring chemical compatibility and responsive sealing. Made from glass-filled polypropylene, these valves handle operating pressures up to 125 psi and temperatures up to 140°F, making them suitable for applications in water, chemical processing, and air systems.
- Glass-filled polypropylene
- FKM seal
- 302 stainless steel spring
- Cv 10.2 enables high flow performance in compact design
- Seat area features a 0.438” open diameter for efficient flow
- Cracking pressure: 1/3 psi
- O-ring poppet design ensures reliable & repeatable sealing
- Max. working pressure: 125 psi
- Max. working temperature: 140°F