In a further aspect, a method of manufacturing a check valve is provided which includes: providing a valve housing having a pair of opposite end faces comprising an upstream end face and a downstream end face, and a fluid passage extending axially through the valve housing between the upstream end face and the downstream end face, and wherein a first seating surface is formed within the valve housing around the fluid passageway and adjacent to the upstream end face;Check Valves providing a seating ring having a second seating surface adapted to engage the first seating surface, and a disk-shaped poppet adapted to sealingly engage the seating ring; providing a spring-biasing mechanism for biasing the disk-shaped poppet against the seating ring; providing an o-ring sized to compressively reside between the first seating surface and the second seating surface when the seating ring and the valve housing are placed in engagement; and assembling the valve housing, seating ring, disk-shaped poppet, spring-bias mechanism and o-ring by disposing the spring-bias mechanism and the disk-shaped poppet within the valve housing such that the disk-shaped poppet is spring-biased towards the upstream end face, and placing the seating ring in engagement with the valve housing with the o-ring disposed between the first seating surface and the second seating surface in a compression fit and so that the disk-shaped poppet resides against the seating ring and projects an outward force thereon from the spring-biasing mechanism,Check Valves wherein the o-ring is sized and fabricated to ensure maintenance of the seating ring and valve housing in fixed relation to each other notwithstanding the outward spring-bias force.

To restate, presented herein is an improved wafer style check valve which provides an enhanced fluid seal between the seating ring and valve housing by disposing an o-ring between the seating surfaces of the seating ring and housing. Further, the o-ring is sized and constructed to compression fit and snap lock between the seating ring and valve housing and thereby resist an outward axial biasing force against the seating ring imparted by a spring-bias mechanism coupled to the poppet within the valve housing and in sealing engagement against the seating ring.FILTER SERIES A uniquely configured lip is disposed on either the valve housing or the seating ring to ensure that the o-ring remains in axially fixed position between the seating ring and valve housing. In one embodiment, the snap-lock of the o-ring between the seating ring and valve housing is achieved by forcing the o-ring over this retaining lip. The compression and snap-lock fit of the o-ring between the seating ring and valve assembly allows elimination of the conventional screws used for temporarily securing the seating ring to the valve housing during transport and prior to operational installation of the check valve within a conduit between companion flanges. Advantageously, a check valve in accordance with the present invention is a functionally reliable design that is easy to fabricate. Further, the check valve can be readily disassembled in the field for repair if necessary.

MORE NEWS