PNEUMATIC BRAKE ACTUATOR WITH FLOW INSENSITIVE TWO WAY CONTROL VALVE

摘要

A pneumatic brake actuator includes a spring brake actuator with a spring chamber and a spring brake pressure chamber; and a common brake actuator with a common brake pressure chamber and a pushrod chamber. The control valve includes a sealing unit capable of being moved between an opening position and a closing position for controlling a fluid flow between the spring chamber and the common pressure chamber. The first surface of the sealing unit is connected to the common brake pressure chamber. The second surface of the sealing unit is connected to the valve chamber which is not connected to the brake pressure chamber or the spring chamber. The sealing unit is moved between the opening position and the closing position according to the pressure of the common brake pressure chamber. The movement of the sealing unit is independent from a flow rate of the fluid between the spring chamber and the common brake pressure chamber.