| 摘要 |
A flow limiting, surge damping directional control valve (11) utilizes flow regulating and surge damping means (30) for limiting the rate of flow of an operating fluid in a fluid flow path so as to absorb surge irregularities during the operation of the valve (11). The flow regulating and surge damping means (30) is carried by a movable valve member (25) adapted to control the flow and direction of flow of the operating fluid of the fluid flow path. This arrangement includes a flow regulating piston (35) having metering ports (37) for regulating the rate of flow of the operating fluid across the piston (35) and means (29) for slidably mounting the flow regulating piston on the movable valve member (25) so that the flow regulating piston (35) is positioned adjacent a selected port of the valve (11) during the operation thereof. Biasing means (39) biases the flow regulating piston (35) against the flow of the operating fluid so that when a predetermined pressure drop is experienced across the face of the regulating piston (35), the piston (35) moves against the force of the biasing means (39) in the direction of fluid flow to seal or constrict the selected port until the pressure of the fluid has dropped below the predetermined magnitude.
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