694 POPPET CHECK VALVE

Maximum Operating Pressure — 125 psi
Maximum Operating Temperature — 140°F
Seat Area Open Diameter — .438

Design Considerations

The 694 Series 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 first before pressure builds enough to move the poppet away from the seat. The 694 Series Check Valve maximum operating pressure of 125 psi covers a wide range of air and fluid applications. The 694 Check Valve is a compact design with a light cracking pressure, high flow rate, and a positive seal at very low back pressure or slight vacuum. For higher cracking pressure applications, an embedded o-ring poppet is substituted for the standard elastomer disc poppet

Options

Material Options Black Polypropylene Body & Poppet, White Polypropylene Body & Poppet

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

End Options 1/4 Female NPT X 1/4 Female NPT

Cracking Pressure 302 Stainless Spring - 1/3 psi (Disc Poppet - Standard), 1 psi (O-Ring Poppet), 7 psi (O-Ring Poppet), 9 psi (O-Ring Poppet)
Hastelloy Spring - 1/3 psi (Disc Poppet), 1 psi (O-Ring Poppet)
No Spring

Example of how to order

Body Material:
White Filled Poly

Inlet End
1/4 FNPT

Outlet End
1/4 FNPT

Seal
Viton®

Spring
1 psi, O-Ring

SMC Part Number: WFP CHK 694-4F4F-F,1# O-Ring

The flow arrow on the body will point from Inlet to Outlet. SMC Part Numbers are a description of the valve as read left to right, Inlet to Outlet.
Example: WFP CHK 694-4F4F-F,1# O-Ring = 1/4 FNPT Inlet x 1/4 FNPT Outlet