| 摘要 |
A fast-action valve has an axially displaceable but nonrotatable valve stem engageable with a seat in the passage of a valve body. The stem has a pair of laterally extending arms guided in axial slots in an axial sleeve forming part of the valve body. A handle is formed with an axially opening cavity receiving the arms of the stem and provided with a pair of axially symmetrical ramps which coact with the arms to axially displace the stem against the force of a spring on rotation of the handle. The handle is formed of a pair of symmetrically identical members joined together along a plane lying along the stem axis and in line with the two highest points (least-axial-force regions) of the ramps. Furthermore the valve handle has an inwardly projecting rim received by a guide on the sleeve so that the handle merely rotates without being displaced axially on rotation.
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