| 摘要 |
A high pressure gate valve apparatus provides an elongated cylindrical valve body providing a fluid conveying linear cylindrical longitudinal bore of substantially uniform configuration. A gate valving member is movable within the valve body entirely within the confines of the valve body and not projecting laterally therebeyond. The valve member is movable at generally right angles to and intersecting the fluid conveying bore with the gate valving member providing a flow opening therethrough, the valving member being movable within the valve body between open flow and closed flow positions. A pair of spaced generally parallel cylindrical drive chamber is provided on the valve body substantially parallel to the central flow conveying bore. A pair of power receptive cylindrical operator shafts are slideably movable within the pair of drive chambers respectively with each shaft having valve pistons at its end portions adapted to move the shafts responsive to the introduction of hydraulic fluid into the drive chambers. A pair of gear structures associated respectively with and engagedly driven respectively by the pair of operator shafts engages both the shafts and the valving member for moving the valve member in its lateral path between open flow and closed flow positions. An attachment is provided for providing hydraulic power to the valve body and therethrough to the end portions of the drive chambers, whereby the operator shafts can be singly or doubly powered by hydraulic fluid.
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