| 摘要 |
A ball valve has a valve body (10) having a chamber (16), aligned inlet a nd outlet passages (6, 8) providing flow therethrough, and an access passage (24) communicating with the chamber (16). A replaceable cartridge assembly (14) is seated in the chamber (16) and includes a generally spherical ball ( 32) having a flow passage (35) therethrough alignable with the inlet and out let passages (6, 8), an inlet valve seat (34), and an outlet valve seat (36) . A cartridge body member (38) extends about and couples the ball and the va lve seats (34, 36). A resiliently deflectable biasing member (46) biases the inlet valve seat (34) and the ball against the outlet seat (36). A resilien tly deflectable biasing member (48) acts upon the inlet end (34) of the cart ridge body (38) and a deflector (50) is movable between a first position in which the biasing member (48) is substantially free from deflection and a se cond position in which the biasing member is deflected to bias the cartridge body (38) and the outlet valve seat (36) against the wall of the valve body chamber (16) to effect a seat-to-body seal.
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