| 摘要 |
A pressure control valve includes a shaft hole (16) formed through a wall surrounding a pressure detecting chamber (28) of a body (11), the shaft hole (16) being provided with a valve port (39) , a communication shaft (32) inserted through the shaft hole (16) and having an end protruding from the valve port (39) and provided with a valve element (33), a biasing unit (22) for biasing the valve element (33) so that the valve element (33) is pressed against an opening edge of the valve port (39) thereby to close the valve port (39), a branch hole (17) branched from a middle portion of the shaft hole (16) and communicating with the valve port (39), a sealing member (80) sealing a gap between the communication shaft (32) and an inner wall of the shaft hole (16) , a pressure sensing cylindrical member (42) having a closed end fixed to the communication shaft (32) in the pressure detecting chamber (28) and an open end directed opposite the valve element (33), a diaphragm (44) mounted on the open end of the pressure sensing cylindrical member (42), a terminal wall (24) formed on the body (11) so as to be opposed to the diaphragm (44) , and a stretching member (50) stretched between the diaphragm (44) and the terminal wall (24), the stretching member (50) being subj ected to a spring force the diaphragm (44) receives when the fluid pressure is in the pressure detecting chamber (28) is lower than the predetermined reference pressure, thereby moving the valve element (33) to the opening side. |
