Door closing device for a fireproof door comprises a drive unit arranged in a housing and coupled with a door via an output shaft, an elastic force storage unit coupled with the drive unit and a hydraulic unit

摘要

Door closing device (1) comprises a drive unit (3) arranged in a housing (2) and coupled with a door via an output shaft (4), an elastic force storage unit (5) coupled with the drive unit and a hydraulic unit (6) with a main working piston, an outer pressure chamber, a control valve and a magnet. Preferred Features: A channel section is arranged in the housing and contains the control valve for the pressure chamber. A non-return valve is arranged in the main working piston and is in a flow connection with the pressure chamber via a hydraulic channel.