| 摘要 |
A check valve used in a fluid flow line is disclosed and includes a body having a first portion defining an inlet passageway, an outlet passageway and a shoulder which directs fluid flow upwardly through an opening into the outlet passageway and a second portion with a tubular section threadably engaged in the opening which receives the flowing fluid in one end for flowing up the tubular section and out outlet ports. A flange extends outwardly from the tubular portion at a location below the outlet ports to define an upwardly facing sealing surface. A plunger member is mounted within the body and includes a plug slideably mounted within the longitudinal passage and a tubular sleeve mounted to circumscribe the tubular section with the sleeve having a shoulder forming a downwardly facing sealing surface which is engageable with the upwardly facing sealing surface on the flange, the sleeve being moved upwardly by the pressure exerted by the fluid on the plug. A spring is mounted with the plunger member to urge the downwardly facing sealing surface into engagement with the upwardly facing sealing surface to thereby prevent fluid communication between the inlet and outlet passageways by stopping fluid flow into the outlet ports when the pressure of the fluid within the inlet passageway is insufficient to overcome the force provided by the spring.
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