| 摘要 |
A check valve having a valve housing with a pair of opposite end faces including an upstream end face and a downstream end face. The valve housing has a fluid passage extending axially therethrough between the upstream end face and the downstream end face. A first seating surface is formed within the valve housing around the fluid passageway and adjacent to the upstream end face. A seating ring is provided having a second seating surface adapted to engage the first seating surface when the seating ring is disposed in engagement with the valve housing. An o-ring is sized to reside between the first seating surface and the second seating surface when the seating ring and valve housing are placed in engagement to maintain the seating ring and valve housing in fixed relation to each other notwithstanding an outward axial biasing force thereon. At least one of the first seating surface and the second seating surface includes a retaining lip which ensures that the o-ring remains axially fixedly positioned between the first seating surface and the second seating surface.
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