| 摘要 |
A damping valve includes a main valve (3) opening and closing a main passage (1a), and a pilot passage (PP) reducing a pressure of the upstream of the main passage (1a) by a throttle (1f) to guide as a back-pressure biasing the main valve (3) to the closing direction. A pressure control valve (PV) being disposed on the downstream of the throttle (1f) and including a seating portion (22h) controlling the back-pressure, and a switching valve (SV) including a circular depressed portion (22c) opening and closing the pilot passage (PP) are integrated and controlled by a single solenoid (Sol). The damping valve includes fail passages (20j and 21j) being branched from the downstream of the throttle (1f) to bypass the main valve (3), and a fail valve (31) opening and closing the fail passage. The switching valve (SV) is arranged on the upstream of the pressure control valve (PV) in the pilot passage (PP). The fail passages (20j and 21j) are branched from the upstream of the switching valve (SV) of the pilot passage (PP). |
