| 摘要 |
PROBLEM TO BE SOLVED: To provide a valve control device and the like for closing/opening by controlling an American type valve by a pressure of a fluid supplied to the valve. ! SOLUTION: When high pressure air is supplied to an air supply chamber 109 of a regulator 14, the high pressure air is fed to an air injection port 89 via an air flow passage 114. In a piston 110 in a cylinder 101, a Y1 direction force based on the pressure of the high pressure air is acting, and also a Y2 direction valve closing force based on a valve spring 87 via a valve body 84 of a tire valve 12 and a piston rod 111 is acting. When the pressure of the high pressure air exceeds a predetermined value, the Y1 direction force acting on the piston 110 exceeds the Y2 direction valve closing force, so that the tire valve 12 comes into an open valve state, and the high pressure air supplied to the air supply chamber 109 passes through the tire valve 12 and fed into a tire tube 9a. When the pressure of the high pressure air becomes equal |
