PRESSURE AND TEMPERATURE COMPENSATED CONTROL VALVE ASSEMBLY

摘要

A pressure and temperature compensated valve assembly includes a flow valve allowing inflation flow from a control port to a tire port and controlling deflation flow from the tire port to the control port. A throttle valve restricts deflation flow between the tire port and the control port when deflating the tire at high flow rates or when tire pressure is high, thus enabling the flow valve to be closed. The throttle valve includes a throttle diaphragm that throttles in response to flow from the tire port and which does not restrict inflation flow from the control port. The valve assembly further includes a temperature responsive member engaging the flow valve, and which deforms in response to a change in temperature in the valve assembly, thus negating temperature effects on the flow valve, allowing the flow valve to close at a consistent force across a range of operating temperatures.

主权项

1. A control valve assembly comprising:
a valve body having a control port and a tire port, the valve body defining a flow chamber and a regulation chamber disposed between the control port and the tire port; a flow valve disposed in the flow chamber to control flow between the flow chamber and the regulation chamber, the flow valve being biased in a flow closed position and movable between the flow closed position and a flow open position in response to pressure in the flow chamber; and a throttle valve disposed in the regulation chamber to restrict flow from the regulation chamber to the flow chamber, the throttle valve including a throttle valve seat and a throttle diaphragm for moving with respect to the throttle valve seat; wherein the throttle valve is movable between a throttle open position of the throttle valve, where the throttle diaphragm is spaced a distance from the throttle valve seat, and a throttle throttling position of the throttle valve, where the throttle diaphragm is spaced nearer the throttle valve seat than in the throttle open position, wherein the throttle diaphragm has opposite sides each in communication with pressure in the regulation chamber, and wherein flow through the regulation chamber effects a pressure differential across the throttle diaphragm causing the throttle diaphragm to move between the throttle open and throttle throttling positions.