Patent ID: 8136893
Filing Date: 2012-03-20
Classification: B60T,F16K,Y10T

Abstract:
1. A control valve for use in a pneumatic system, comprising: a valve body, wherein the valve body further comprises: a first piston disposed within the top chamber and having a bore passing lengthwise therethrough; a first biasing member disposed within the top and middle chambers and defining an annular orifice therewith, wherein a second piston is in selective engagement with the first piston; a valve member connected to the bottom portion of the second piston; a third piston disposed within the bottom chamber beneath the valve member; and wherein a first positive control air pressure signal applied to the first pilot air inlet moves the valve member to a first position; wherein a second positive control air pressure signal applied to the first pilot air inlet moves the valve member to a second position; and wherein a second biasing member moves the valve member to the second position when the system operating air pressure received by the at least one supply port is below a predetermined pressure.