Emergency valve for a pneumatic door-actuating device

摘要

What is proposed is an emergency valve for a door-actuating device, which is provided with a locking means (21/34) actuable electromagnetically. A mechanical actuating device of the emergency valve is provided with an automatic turn-back device (21/24 or 41/42) which runs back automatically into its initial position after the release of the locking means (21/34). … …