Combination inversion and relay or quick release valve assembly
First Claim
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1. A vehicle brake system, comprising:
- at least one brake actuator having a service chamber and an emergency chamber, the service chamber being pressurized to apply a braking force, the emergency chamber being pressurized to hold off a braking element that otherwise provides an emergency braking force;
a pressure source that provides fluid pressure to the brake actuator to control the application of a braking force; and
a single combination valve coupling the brake actuator emergency chamber to the pressure source, the combination valve having an inlet coupled to the pressure source and an outlet coupled to the emergency chamber, the valve including a moving member that moves responsive to pressure in the system such that the combination valve is operative as an inversion valve and a relay valve.
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Abstract
A combination valve assembly provides dual functionality within a single valve housing. In one example, the valve operates as a combination inversion valve and quick release valve. In another example, the combination valve operates as an inversion valve and a relay valve. The valve is particularly useful for controlling the operation of a spring applied, air release brake actuator in a heavy vehicle braking arrangement. A valve designed according to this invention preferably also provides anti-compounding features.
8 Citations
20 Claims
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1. A vehicle brake system, comprising:
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at least one brake actuator having a service chamber and an emergency chamber, the service chamber being pressurized to apply a braking force, the emergency chamber being pressurized to hold off a braking element that otherwise provides an emergency braking force;
a pressure source that provides fluid pressure to the brake actuator to control the application of a braking force; and
a single combination valve coupling the brake actuator emergency chamber to the pressure source, the combination valve having an inlet coupled to the pressure source and an outlet coupled to the emergency chamber, the valve including a moving member that moves responsive to pressure in the system such that the combination valve is operative as an inversion valve and a relay valve. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A combination valve for use in a vehicle brake system, comprising:
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a valve housing having at least a first inlet adapted to be coupled to a pressure source of the brake system and at least one outlet adapted to be coupled to an emergency chamber of a primary brake actuator in the system and an exhaust port that is adapted to couple the emergency chamber to atmosphere;
a pressure control member within the valve housing that is biased into an exhaust position to couple the outlet to the exhaust port; and
a piston housed within the valve housing such that the piston in moveable within the housing responsive to pressure at the first inlet to move the pressure control member out of the exhaust position such that pressure from the pressure source can be supplied through the outlet to the emergency chamber of the primary brake actuator. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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16. A vehicle brake system, comprising:
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at least one brake actuator having a service chamber and an emergency chamber, the service chamber being pressurized to apply a braking force, the emergency chamber being pressurized to hold off a braking element that otherwise provides an emergency braking force;
a pressure source that provides fluid pressure to the brake actuator to control the application of a braking force; and
a single combination valve coupling the brake actuator emergency chamber to the pressure source, the combination valve having an inlet coupled to the pressure source, an exhaust port coupled to atmosphere, and an outlet coupled to the emergency chamber, the valve including a control member that is biased into a position to couple the outlet to the exhaust port, the control member moving responsive to pressure in the system such that the combination valve is operative as a combination inversion valve and quick release valve. - View Dependent Claims (17, 18, 19, 20)
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Specification