Design Considerations
The 687 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 | 3/4"Female NPT |
Seal Option | Buna-N, Ethylene Propylene, Fluoroelastomer (Viton®), AFLAS® *** 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), 2 PSI (O-Ring Poppet), 9 PSI (O-Ring Poppet) Hastelloy Spring: 1/3 PSI (Disc Poppet), 0.5 PSI (O-Ring Poppet), 0.7 PSI (O-Ring Poppet), 1.5 PSI (O-Ring Poppet), 3 PSI (O-Ring Poppet), 7 PSI (O-Ring Poppet) No Spring |
Maximum Flow Diameter | 0.812 in |
Cv | 12.5 with 3/4"Female NPT Ends |
Maximum Operating Pressure | 125 PSI |
Maximum Operating Temperature | 140 °F |
CONTACT US FOR MORE INFORMATION
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