Patent ID: 8794715
Filing Date: 2014-08-05
Classification: B60T

Abstract:
1. An electro-pneumatic valve system, comprising: (a) a first valve adapted to operatively respond to a momentary electrical signal for opening the first valve, the first valve delivering a first momentary pneumatic control signal when open; (b) a second valve adapted to operatively respond to a momentary electrical signal for opening the second valve, the second valve delivering a second momentary pneumatic control signal when open; (c) a third valve in communication with the first and second valves, and wherein the third valve is adapted to operatively respond to the first and second momentary pneumatic control signals, the third valve opening upon receiving the first momentary pneumatic control signal and remaining open until receiving the second momentary pneumatic control signal; (d) an electrical switch unit in electrical communication with the first and second valves for sending the momentary electrical signals; (e) a source of pressurized control air in communication with the first and second valves; (f) a source of pressurized supply air in communication with the third valve, and wherein the pressurized supply air passes through the third valve when the valve is open; and (g) a terminal device in communication with the third valve, and wherein the terminal device is adapted to receive pressurized supply air to release an associated parking brake when the third valve is open and to exhaust pressurized supply air to apply the associated parking brake when the third valve receives the second momentary pneumatic control signal and is closed.