| 摘要 |
The present invention is directed to a compact and modular gate valve comprising an elongated body which comprises first and second ends, a hole which extends longitudinally between the first and second ends, a first opening which communicates with the hole proximate the first end, a second opening which communicates with the hole proximate the second end, and a bore which extends transversely through the body and intersects the hole; a first seat which is mounted in a first intersection of the bore with the hole and a second seat which is mounted in a second intersection of the bore with the hole, the first and second seats each including a passageway that aligns with the bore; a valve stem which is slidably positioned in the hole and which includes first and second piston portions that are separated by a gate portion, the stem being movable between an open position in which a hole in the gate portion is aligned with the passageways and a closed position in which the hole is offset from the passageways; and first and second seals which are positioned between the hole and the first and second piston portions, respectively; wherein hydraulic pressure in a first piston chamber defined by the first piston portion, the first seal and the hole will move the gate from the open position to the closed position, and hydraulic pressure in a second piston chamber defined by the second piston portion, the second seal and the hole will move the gate from the closed position to the open position.
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