High and low pressure responsive cut-off valve

Claim 1

A VALVE FOR CONTROLLING A CONDUIT COMPRISING, A BODY HAVING A BORE THEREIN PROVIDING A SEAT FOR A SLIDE VALVE MEMBER, AN INLET PASSAGEWAY IN THE BODY TERMINATING IN THE BORE, AN OUTLET PASSAGEWAY IN THE BODY TERMINATING IN THE BORE AT A POINT SPACED AXIALLY OF THE BORE FROM SAID INLET TERMINUS, ONE OF SAID PASSAGEWAYS HAVING AN ADDITIONAL TERMINUS IN THE BORE OF THE BODY AT A POINT SPACED AXIALLY OF SAID PREVIOUSLY MENTIONED TERMINI, A VALVE MEMBER IN SAID BORE INTERRUPTING COMMUNICATION BETWEEN THE INLET AND OUTLET PASSAGEWAYS WHEN IN AN INTERMEDIATE POSITION AND ESTABLISHING COMMUNICATION BETWEEN SAID PASSAGEWAYS WHEN SHIFTED AXIALLY IN EITHER DIRECTION, A CONTROL CONDUIT FOR CONDUCTING CONTROL FLUID PRESSURE TO AN ENDWISE PRESSURE RESPONSIVE SURFACE ON THE VALVE MEMBER, FIRST RESILIENT MEANS URGING THE SLIDE VALVE MEMBER IN A DIRECTION OPPOSED TO THE FORCE EXERTED BY CONTROL FLUID PRESSURE ON THE SLIDE VALVE MEMBER, SECOND RESILIENT MEANS URGING THE SLIDE VALVE MEMBER IN A DIRECTION OPPOSED TO THE FORCE EXERTED BY CONTROL FLUID PRESSURE ON THE SLIDE VALVE MEMBER, AND STOP MEANS CARRIED BY THE SECOND RESILIENT MEANS IS EFFECTIVE TO URGE SAID VALVE MEMBER AGAINST THE FORCE EXERTED BY CONTROL FLUID PRESSURE ON THE SLIDE VALVE MEMBER.