| 摘要 |
<p>A relief valve (1) includes a valve body (2) having a first port (11), through which a fluid flows into the relief valve, and a second port (12), through which the fluid is discharged, a sleeve (4) slidably movable within the valve body and having an inflow port (7) and a discharge port (8), a valve (5) slidably movable within the sleeve while receiving a pressure of the fluid via the inflow port and establishing a closed state and an open state, a biasing member (6) applying a biasing force to the valve in a direction resisting against a fluid pressure applied from the first port, a state switching mechanism (13) switched between a first state and a second state, and a valve (17) provided at a drain passage to interrupt a flow back of the fluid from therefrom while the state switching mechanism is in the second state.</p> |
