Controllable valve, preferably for gasbag, and method of medium flow limiting

The subject of the invention is a drivable semi-active valve, which can be used in particular as a controlled discharge valve for an airbag system. The relevant part of the invention is that the valve has an inner deformable shell, one-sidedly closed on the outflow side, which is placed inside an outer shell and which is equipped with a tightening element in its middle part. Additionally, a pressure equalization pipe is placed inside the inner shell. The method for restricting the flow of fluid is based on the principle that after reduction or elimination of the tightening ring operation, the outer and subsequently inner shell is released by the pressure of the flowing fluid and the flow rate can be controlled.