| 摘要 |
A hydraulic control valve includes a piston held in a cylinder and reciprocatable, a positive pressure chamber formed on one side of the piston and connected to an inlet port and an outlet port, a back pressure chamber formed on another side of the piston, a valve element formed on the piston to open and close the outlet port, an orifice arranged between the positive chamber and back chamber, and a pilot valve selectively providing a connection between the back chamber and a site having a pressure lower than that in the back chamber. The inlet port is connected to a high pressure site, and the outlet port is connected to a low pressure site having a pressure lower than that in the high pressure site. The control valve includes an orifice adjustment device adjusting an opening degree of the orifice based on a pressure drop in the back chamber. |
