| 摘要 |
A ball valve has a valve body with a bonnet bore communicating with a through fluid bore. An unyielding valve seat is fixed in the valve body at a location surrounding the axis of the fluid bore. A bonnet with a stem bore extending therethrough is received in the bonnet bore. The bonnet is adjustable within the bonnet bore to shift the axis of the stem bore transversely with respect to the fluid bore axis. A stem is rotatably received in the stem bore. A ball with a passageway extending therethrough is carried by the stem and located in the through fluid bore. The center of the ball is offset with respect to the rotational axis of the stem. During initial assembly of the valve components, the ball is located in a closed position against the seat by selected adjustment of the bonnet in the bonnet bore coupled with rotation of the stem. The bonnet is then fixed in the bonnet bore. Thereafter, the ball may be operated between the closed position and an open position aligning its through passageway with the fluid bore by rotating the stem in the thus fixed bonnet.
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