| 摘要 |
A quick closing shut-off valve includes an inlet, an outlet and a passage there between. A closing element blocks the passage when in the closed position. The closing element is interconnected to a piston via a pull rod. The piston is positioned within a working chamber that communicates with the valve outlet. A safety valve also communicates with the working chamber and is positioned above the piston. As a result, when the pressure within the tank, and thus in the working chamber, reaches a maximum permissible pressure, the safety valve opens and the pressure above the piston decreases. The piston rises as a result and pulls the closing element via the pull rod into the closed position so that the valve is closed.
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