687 SERIES POPPET CHECK VALVE on Specialty Mfg. Co., The


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larger image		The 687 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 at about 1/3 psi before pressure builds enough to move the poppet away from the seat. The 687 Series Check Valve maximum operating pressure of 125 psi covers a wide range of air and fluid applications. The 687 Check 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 cracking pressure applications 1 psi and higher, an embedded o-ring poppet is substituted for the standard elastomer disc poppet.