| 摘要 |
PURPOSE:To minimize the loss of the stepping force, by operating a ball for fixing a control piston upon failure of one system thus releasing the liquid pressure control of the other system. CONSTITUTION:Stepped piston 12 will move to the inside against springs 30, 35 to close a valve body 19 thus to perform the liquid pressure control. A sleeve piston 25 will hold a metal ball 27 and never move normally. When one system, for example system 2a, fails said piston 25 is moved to the direction A by the liquid pressure in a normal system. Consequently the ball 27 will move along a guide face 37 in the direction of C and drop in a groove 31 of the stepped piston 12. Consequently the motion of the stepped piston 12 is blocked, to release the liquid pressure control in the normal system thus to minimize the loss of the stepping force. |
