Emergency relay valve

Claim 1

AN EMERGENCY RELAY VALVE COMPRISING A HOUSING HAVING INLET, OUTLET NAD EXHAUST PORTS THEREIN, FIRST VALVE MEANS CONTROLLING PRESSURE FLUID COMMUNICATION BETWEEN SAID PORTS, AN EXPANSIBLE CONTROL CHAMBER IN SAID HOUSING, VALVE OPERATING MEANS FOR SAID FIRST VALVE MEANS AND NORMALLY OPPOSING EXPANSION OF SID CONTROL CHAMBER, EMERGENCY PISTON MEANS SLIDABLE IN SID HOUSING AND DEFINING THEREWITH SEPARATE CONNECTION AND EMERGENCY CHAMBER SAID CONNECTION CHAMBER BEING IN OPEN PRESSURE FLUID COMMUNICATION WITH SID CONTROL CHAMBER, AN EMERGENCY PORT IN SAID HOUSING, A PAIR OF OPPOSED FLUID PRESSURE RESPONSIVE AREAS ON SAID EMERGENCY PISTON MEANS RESPECTIVELY SUBJECTED TO THE FLUID PRESSURE AT SAID EMERGENCY PORT AND THAT IN SAID EMERGENCY CHAMBER, PASSAGE MEANS IN SAID HOUSING CONNECTING SAID EMERGENCY PORT WITH SAID EMERGENCY CHAMBER AND INLET PORT, UNIDIRECTIONAL VALVE MEANS IN SAID PASSAGE MEANS PROVIDING PRESSURE FLUID PASSAGE ONLY FROM SAID EMERGENCY PORT OT SAID INLET PORT AND EMERGENCY CHAMBER, OTHER PASSAGE MEANS IN SAID EMERGENCY PISTON BETWEEN SAID CONNECTION AND EMERGENCY CHAMBERS, A SERVICE PORT IN SAID HOUSING CONNECTED WITH SAID CONNECTION CHAMBER, SECOND VALVE MEANS IN SAID EMERGENCY PISTON MEANS CONTROLLING PRESSURE FLUID COMMUNICATION BETWEEN SAID CONNECTION CHAMBER, EMERGENCY CHAMBER AND SERVICE PORT, SID EMERGENCY PISTON MEANS BEING MOVABLE TO AN EMERGENCY POSITION IN SAID HOUSING IN RESPONSE TO A PREDETERMINED DIFFERENTIAL BETWEEN THE FLUID PRESSURE AT SID EMERGENCY PORT AND THAT IN SAID EMERGENCY CHAMBER CTING ON SID PRESSURE RESPONSIVE AREAS TO MOVE SAID SECOND VALVE MEANS TO A POSITION INTERRUPTING PRESSURE FLUID COMMUNICATION BETWEEN SAID SERVICE PORT AND CONNECTION CHAMBER AND ESTABLISHING PRESSURE FLUDI COMMUNICATION BETWEEN SID EMERGENCY AND CONNECTION CHAMBERS, AND SAID VALVE OPERATING MEANS BEING MOVABLE IN RESPONSE TO ESTABLISH FLUID PRESSURE IN SAID CONNECTION AND CONTROL CHAMBERS TO MOVE SAID FIRST VALVE MEANS TO A POSITION INTERRUPTING PRESSURE FLUID COMMUNICATION BETWEEN SAID OUTLET AND EXHAUST PORTS AND ESTABLISHING PRESSURE FLUID COMMUNICATION BETWEEN SAID INLET AND OUTLET PORTS.