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SMC 685 Series Poppet Check Valves


Design Considerations

  • The 685 Poppet Check Valve incorporates a thin elastomer disc supported by a poppet

  • that seals on the seat

  • Pressure in the flow direction moves the seal off the seat at about 1/3 psi before pressure builds enough to move the poppet away from the seat

  • Compact design with a light cracking pressure, high flow rate, and a positive seal at very low back pressure or slight vacuum

  • An embedded O-Ring Poppet is supplied for cracking pressure applications 1/2 psi and higher


Specifications

Material

Black Glass Filled Polypropylene, White Glass Filled Polypropylene

Black PVDF (Kynar®)

End Options

1/2"Male NPT

1/2"Female NPT

Seal Option

Buna-N, Ethylene Propylene, Fluoroelastomer (Viton®)

*** Please ask us about Seal Materials not listed above. ***

Spring Option:

Cracking Pressure and Material

302 Stainless: 1/3 PSI (Disc Poppet), 0.5 PSI (O-Ring Poppet), 1 PSI (O-Ring Poppet), 3 PSI (O-Ring Poppet), 5 PSI (O-Ring Poppet), 12 PSI (O-Ring Poppet)

Hastelloy Spring: 1/3 PSI (Disc Poppet), 0.5 PSI (O-Ring Poppet), 3 PSI (O-Ring Poppet), 7 PSI (O-Ring Poppet), 12 PSI (O-Ring Poppet)

No Spring

Maximum Flow Diameter

0.625 in

Cv

10.2 with 1/2"Female NPT Ends

Maximum Operating Pressure

125 PSI

Maximum Operating Temperature

140 °F

CONTACT US FOR MORE INFORMATION

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