| 摘要 |
PROBLEM TO BE SOLVED: To provide a check valve capable of preventing the abnormal movement of a valve body due to pressure pulsation generated on an outflow port side of the check valve.SOLUTION: A check valve 20 is equipped with a valve casing 21 formed with a first channel 22 and a valve seat 23 inside, and a valve mechanism 40 which has first energizing means 42. Between an inflow port 24 and the valve seat 23 of the check valve 20 in the first channel 22, a second channel 27 having a branch port 26 branching off from the first channel 22 is formed. A valve body locking member 50 having a pressure receiving portion 51 and locking portion 52, and second energizing means 53 are provided. The valve body locking member 50 locks a valve body 41 in a valve-close state, thereby preventing the abnormal movement of the valve body 41 due to pressure pulsation generated on an outflow port 25 side of the check valve 20; and press-moves the pressure receiving portion 51 by the action of liquid pressure of a liquid medium in the second channel 27 before the valve body 41 moves in a valve-open direction on the basis of liquid pressure of a liquid medium on the upstream side of the valve seat 23 in the first channel 22, thereby moving the locking portion 52 to a locking releasing position of the valve body 41.SELECTED DRAWING: Figure 2 |
