Device for blocking and allowing a fluid stream and accompanying method

摘要

The device (1) has a main opening (5) arranged between a gas-inlet (3) and a gas-outlet (4). A main blocking element e.g. valve plate (6), is arranged in a closed position so that an increased fluid pressure causes a press force. A fluid overflow path is provided between the inlet and the outlet. The element is released from the closed position by an actuation device. An opening force is exerted by pre-stressing the element in direction of the opening position, so that the element remains in the closed position only as long as the fluid pressure overcompensates the prestress. An independent claim is also included for a method for blocking and releasing a fluid flow.