| 摘要 |
<p>The invention relates to a safety valve (10) for consumers driven by compressed air, comprising two directional valves (16a, 16b) connected in parallel, each of which can be operated by a pilot valve (26a, 26b) allocated thereto. The two valve heads (18a, 18b) are guided in a respective bore (36a, 36b) of the valve housing (12) and the two bores are interconnected in a crosswise manner via two cross-channels (46a, 46b). The valve seat (28a, 28b) of each pilot valve is connected to a cross-channel by a pilot channel (48a, 48b). Said safety valve is characterised in that at each of two interconnected points on the two directional valves, a compressed-air driven switching element (70a, 70b) is provided, by means of which the safety valve can be closed at these two points, if a difference in pressure occurs and in that at least one of the two switching elements can only be reactivated by external compressed-air driven actuation.</p> |
