Drive i.e. door closer drive, for installation in double-wing of fire door of e.g. hospital, has switching valve enabling bypass of magnetic valve, where plunger of switching valve projects out into space for operation of switching valve

摘要

The drive (1) has a gear box arranged in a receiving space of a housing (2) of the drive and cooperated with an output shaft (4) and a lever arm for opening and closing a double-wing of a door i.e. fire door. A valve e.g. switching valve (6), is arranged in a flow channel for controlling behavior of the drive, and a magnetic valve detects the wing in an open position. The switching valve enables bypass of the magnetic valve. A plunger of the switching valve projects out from the flow channel into the receiving space for operation of the switching valve by a cushioning piston.