Fluid handling – Systems – Sequentially closing and opening alternately seating flow...
Patent
1996-11-04
1998-01-20
Michalsky, Gerald A.
Fluid handling
Systems
Sequentially closing and opening alternately seating flow...
137204, F15B 13042
Patent
active
057092460
ABSTRACT:
A contaminant-ejecting, pneumatically-controlled brake booster valve is disclosed. The valve comprises an exhaust piston slidably mounted within the stem of a main piston of the valve, wherein the exhaust piston is actuated by supply air pressure to periodically open and close an exhaust passageway leading from the main piston chamber to an exhaust area. Pressurized supply air normally forces the exhaust piston in the exhaust passage blocking position thereby preventing the escape of control air through the exhaust passageway. When supply pressure is released (e.g. when the parking brake is applied), pressurized control air forces the exhaust piston upward, allowing some of the control air to escape through the exhaust passageway to the exhaust area. The escaping control air expels any moisture or other contaminants that may have accumulated in the main piston chamber. Additionally, a check valve is positioned in an orifice of the main piston. The check valve prevents control air from flowing through the orifice when control air is applied (i.e., when the brakes are applied) and allows delivery air to flow in the opposite direction when control air is released to equalize the pressure on both sides of the main piston and in the main piston chamber.
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Michalsky Gerald A.
Midland Brake, Inc.
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