| 摘要 |
A one-piece polymer plastic shut-off valve that includes a conduit with a first end having a sealing surface thereon and an engagement surface for connection to a fluid system and a plug with a further sealing surface that is yieldably supported in a spaced condition from the sealing surface of the conduit by elongatable supports to allow fluid to flow through said conduit under a first flow condition when the elongated supports are not extended and to prevent flow of fluid through said conduit under a second flow condition when the elongated supports are extended.
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