Compressed air preparation device i.e. membrane dryer, for providing compressed air, has blocking unit associated to flushing air inlet, and including pressure scale that is loaded in load pressure controlled manner

摘要

The device i.e. membrane dryer (5), has a membrane filter including a compressed air input and a compressed air outlet for dried compressed air, and an inlet for flushing air (Ps). A blocking unit i.e. pneumatic switching element (4), is associated to the flushing air inlet. The blocking unit includes a pressure scale, which is loaded in a load pressure controlled manner. The scale includes an annular restrained membrane e.g. seam membrane, with spring constants. Membrane lower and upper sides have same active surfaces. The scale is actively connected with a spring-loaded control unit (1).