| 摘要 |
A safety device is provided for valves in tank bottoms, particularly in tank wagons. The device closes the valve automatically when there is a disturbance endangering the filling or the emptying procedure of the tank, particularly an improper shifting of the tank wagon. The device is particularly characterized by the provision of a hydraulic coupling element consisting of a piston and cylinder and located between the valve closing member and the valve actuating member. When the element is coupled its entire stroke producing volume is filled with a pressure medium. The element is connected with a reserve container and this connection is operated by a valve which in case of disturbance permits an escape of the pressure medium from the cylinder into the reserve container.
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