| 主权项 |
1. A fluid control valve comprising:
inside a valve housing that includes a first port through which a pressure fluid is input and a second port through which the pressure fluid is output, a first flow path and a second flow path that connect in parallel with the first port and the second port, a needle valve unit that opens/closes the first flow path, a check valve unit that opens/closes the second flow path, and an open/close control unit that performs an open/close control of the needle valve unit, wherein the needle valve unit, the open/close control unit, and the check valve unit are disposed coaxially along one axis; the needle valve unit includes a throttle hole that forms a part of the first flow path and a needle valve body that opens/closes the throttle hole, and the needle valve body is formed on a distal end of a rod that extends linearly along the axis and is freely displaceable along a direction of the axis together with the rod; the check valve unit is configured so as to stop flow of the fluid from the first port toward the second port and permit flow of the fluid from the second port toward the first port; the open/close control unit includes a piston provided on the rod, a pressure chamber formed at a side of the piston, and a compression spring for setting an operating pressure of the piston which is provided at another side of the piston; and a conduction hole that connects the throttle hole and the pressure chamber is formed inside the rod and the needle valve body, an end of the conduction hole has an opening in a distal end of the needle valve body, and another end of the conduction hole communicates with the pressure chamber. |
