| 摘要 |
The object of the present invention is a device for controlling a pressure fluid operated actuator, comprising a pilot actuator (1) and a valve assembly (7). The valve assembly comprises two valve means (7a, 7b) which are acted upon by displacing the control members (2, 5) of said pilot actuator (1). Each one of said two valve means comprises four valves. The first valve (8a, 8b) is disposed between the actuator (22) and the pressure fluid tank (T) for controlling the exit flow of pressure fluid. The second valve (10a, 10b) is disposed between the pressure fluid source (P) and the actuator (22) for controlling the pressure fluid supply flow. The third valve (9a, 9b) is disposed inside the stem (27a, 27b) of the first valve (10a, 10b) for governing this valve. The fourth valve (11a, 11b) is disposed in conjunction with the second valve (10a, 10b) for controlling this valve in accordance with the state of the first valve (8a, 8b). |
