| 摘要 |
PROBLEM TO BE SOLVED: To control the opening timing and closing timing of a valve, particularly a gas valve, independently of each other or independently of the action of an inlet valve by setting an operation chamber to the position excited by a pressure medium and setting the operation chamber to the released position independently of each other with a pilot control device. SOLUTION: A control device formed as a spool valve is provided on the pressure excitation side of a piston 4. This control device has a moving control mechanism 6, the operation chamber 3 of an operation cylinder is excited by a pressure medium to open a valve 1, and the operation chamber 3 is released to close a valve 1' via the control mechanism 6. The control mechanism 6 itself is controlled by pilot control devices 27, 29. The control mechanism 6 of the control device provided on the piston 4 sets the operation chamber 3 to the position excited by the pressure medium and sets the operation chamber 3 to the released position independently of each other with the pilot control devices 27, 29. The opening timing and closing timing of a gas valve can be controlled independently of each other, for example. |
