| 摘要 |
A control valve for use in a hydraulic system which includes a cylinder and a piston. The control valve has a casing with a cylindrical bore and a plurality of angularly spaced passages extending from the bore to the outside of the casing. A cylindrical rotor is rotatably mounted within the bore in the casing. The rotor has an upper chamber, a lower chamber, an orifice connecting the chambers and a plurality of angularly spaced ports to permit flow between the chambers and the passages in the casing. A check is located in one of the chambers in the rotor, and a mandrel is located in one of the chambers in the rotor to control flow through the orifice.
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