| 摘要 |
A valve includes a housing having a projection, a plate having a stem rotatably received in the housing, a follower having an oblong orifice for receiving the stem, and defined by two parallel and symmetric engaging flat surfaces for engaging with the engaging flat surfaces of the stem and for allowing the follower to be anchored to and rotated in concert with the stem. The follower includes an extension for engaging with the projection. An engagement of the parallel and symmetric engaging flat surfaces of the stem and of the follower allows the follower to be engaged onto the stem after the stem has been rotated relative to the base, without rotating the follower relative to the base.
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