Patent ID: 7207174
Filing Date: 2007-04-24
Classification: F15B

Abstract:
1. An apparatus comprising: a control valve assembly having a first chamber with a first port, a second chamber with a second port, and a first valve that is operative to open between said first and second chambers in response to elevated pneumatic pressure in said first chamber; said control valve assembly having a primary exit port for venting said second chamber, and a second valve that is operative to open between said second chamber and said primary exit port in response to elevated pneumatic pressure in said second chamber; said control valve assembly further having a bypass exit port for venting said first chamber, and a third valve that is operative to open between said first chamber and said bypass exit port in response to elevated pneumatic pressure in said first chamber; and a pneumatic coupling that is connectable to said control valve assembly in an arrangement in which said bypass exit port is connected to said pneumatic coupling in parallel with said primary exit port.