Electropneumatic door control valve

Details Electropneumatic door control valve Electropneumatic door control valve

1982-11-08

1985-01-22

Michalsky, Gerald A.

Fluid handling

Systems

Supply and exhaust

137595, 91 38, 91446, 91459, 91464, 91465, F15B 13043

Patent

active

044945710

ABSTRACT:
An electropneumatic door valve for use with pneumatic door operations as are used on mass transit vehicles. The single valve housing arrangement provides either a through passageway or a throttled passageway for pressurizing the opening or closing chamber of a pneumatic door drive unit. Provisions are also made to allow automatic reversal should the door become wedged, and to allow manual override should that operation be desired. Electrical pulses initiated by the vehicle operator trigger one of two solenoid valves which direct one of two operating pistons into a position to dictate which passageway will be established. Three vent passageways are provided to exhaust compressed air from any of the chambers which had been charged during a previous door operation.

REFERENCES:
patent: 2619073 (1952-11-01), Brooks et al.
patent: 3906838 (1975-09-01), Hofer
patent: 3921335 (1975-11-01), Hewitt et al.
patent: 4054154 (1977-10-01), Mason
patent: 4080873 (1978-03-01), Bauer et al.
patent: 4339843 (1982-07-01), Burnett, Jr.
patent: 4369696 (1983-01-01), Klatt et al.

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