Diaphragm for duct containing fluid or gaseous medium, comprising bolt with curved cross section for control of flow capacity

摘要

A diaphragm comprising a throttle shaft (2), two sealing rings (3), and a securing bolt (4) can be precisely adjusted regarding its flow capacity by rotating a spindle (2) with a partially inwardly curved outer contour. The diameter of the duct can be controlled from outside the device, facilitating a continuos flow and preventing the creation of a dead space.