Valve for automatic brake system
AssigneeG. W. Lisk Company, Inc.
InventorJeffery A. Tyler
Life of this patent
Estimating the term…
Abstract
A brake valve for an automatic brake system includes an actuator responsive to feedback pressure from a brake for regulating pressure in the brake proportional to an electrical signal applied to the actuator. The actuator exerts a force that is opposed by feedback pressure acting against a predetermined area of the actuator. Valves operated by the actuator provide for alternately communicating a supply of pressurized air to the brake cylinders or discharging air pressure from the cylinders. A low-flow vent valve provides for discharging small quantities of air from my valve. However, a pilot operated high-flow dump valve supersedes the low-flow vent valve for discharging larger quantities of air and permits my valve to be controlled by smaller actuating forces.
Claims13
An electrically actuated valve assembly comprising:
- an actuator responsive to feedback pressure from a brake for regulating pressure in the brake proportional to an electrical signal applied to said actuator;
- an inlet valve connecting a supply chamber for receiving input pressure to a delivery chamber for communicating pressure to the brake, said actuator providing for opening said inlet valve in response to said electrical signal for delivering increased pressure to the brake;
- a control valve connecting said delivery chamber to a relief chamber for discharging said delivery chamber, said actuator providing for closing said control valve in opposition to said feedback pressure for delivering increased pressure to the brake;
- and
- a vent valve directly connecting said relief chamber to a primary exhaust passage, said actuator providing for opening said vent valve in response to said electrical signal for delivering increased pressure to the brake.
Dependencies are inferred from the claim text.