Control head for controlling pipe branching system in industrial process control, has sealing lip deformed to enable pressure-leakage, during excess of limiting pressure between lower housing part and housing part of pneumatic valve drive

摘要

The head (1) has a lower housing part (3) sealable against a housing part (10) of a pneumatic valve drive (8) by a sealing body. The sealing body is designed as a gasket with a sealing lip formed on a lower side turning towards the pneumatic valve drive. A pressure-leakage is enabled by deformation of the sealing lip, during excess of limiting pressure between the lower housing part and the housing part of the valve drive. The gasket is brought into a predetermined sealing tension by a distance piece (18).