| 摘要 |
A device for alternately controlling two cooperating valve assemblies (4, 6; 5, 7) comprises a connection tube (9) connected therebetween, and a movable lever (10) for moving and rotating a carrier element which is arranged in said tube (9) and which by means of said lever (10) is movable into coupling engagement with the spindles of the valves (4, 5), which are arranged in said tube (9) and directed towards one another. The control device (8) provides a normal position in which both valves (4, 5) are open, and two service positions in which one valve is open and the other is closed, and vice-versa. In addition, a guide means (23) prevents a state in which both valves (4, 5) are fully or partly closed. The device (8) is especially applicable to safety valves (6, 7) on pressure vessels (1). |
