| 摘要 |
An excess pressure release is provided which at injector effect during inflation of an air cushion ensures an under-pressure in a part (23) of a valve chamber. By activating a piston (19), the underpressure retains the excess pressure release in its open position against the force of a spring (11), until a desired counter pressure from the filled air cushion stops the injector effect, whereby the excess pressure release is closed. As a result the air cushion may be inflated at a comparative high pressure and thus in a fast manner. The inflation is stopped automatically and securely, when the desired pressure has been reached in the air cushion. |
