| 摘要 |
A pressure regulator mechanism for use in a hydraulic device having a cylinder and a piston slidably movable therein, includes a casing housing the cylinder therein, a first restriction on the cylinder for forming a portion of a passage of working oil between the cylinder and the casing, a valve member angularly movable around an axis of movement of the piston for closing the first restriction, and a second restriction on the valve member for forming a remaining portion of the passage when brought into confronting relation to the first restriction in response to angular movement of the valve member. One of the first and second restrictions has different cross-sectional areas selectable for communication therethrough between the first and second restrictions, so that the rate of flow of the working oil through the passage can be varied.
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