Abstract: A simplified pneumatic door control system provides door control operations for opening, closing, stopping and reversing a door. The door control system includes as control inputs a gas source, a pneumatic motor, a first pilot valve, and pressurized manual check valves. The pressurized manually opened check valves may be used to remotely activate the control system. The control system further includes a second pilot valve, limit triggers, and a braking system. A reversing function of the control system provides the ability to reverse the direction of the door should the door encounter an obstruction upon closing. A second embodiment provides a hold to open control scheme, wherein the door travels only while a pressurized check valve is vented. Corresponding methods for controlling the door are also provided.

Abstract: A door opener includes a motor in mechanical communication with a door, a first gas source for powering the motor, and a control system interposed to the first gas source and the motor. The control system includes a first pilot valve communicating with the first gas source at an inlet port and the motor at a motor port. The first pilot valve also communicates with a first flow control valve at an exhaust port. The first flow control valve regulates the speed of the door during closing and communicates with the first pilot valve at an inlet port and communicates with the atmosphere at an exhaust port.