Three-way valves with adjustable overlap

Claim 1

A VALVE COMPRISING A BODY THROUGH WHICH A CYLINDRICAL CAVITY IS FORMED TOGETHER WITH A COMPRESSED-FLUID INLET DUCT AND AN EXHAUST DUCT, SAID INLET AND EXHAUST DUCTS LEADING INTO SAID CYLINDRICAL CAVITY RESPECTIVELY THROUGH A PAIR OF PORTS SEPARATED BY AN INTERVAL, A LOAD DUCT OPENING INTO SAID CYLINDRICAL CAVITY THROUGH A PORT DISPOSED WITHIN SAID INTERVAL BETWEEN SAID PORTS OF SAID INLET AND EXHAUST DUCTS, A PAIR OF CYLINDRICAL VALVE MEMBERS SLIDABLY MOUNTED IN SAID CYLINDRICAL CAVITY OF SAID BODY, EACH OF SAID CYLINDRICAL VALVE MEMBERS HAVING AN EXTERNAL END PROJECTING EXTERNALLY OF SAID BODY AND AN INTERNAL END HOUSED IN SAID BODY, THE TWO INTERNAL ENDS OF SAID PAIR OF CYLINDRICAL VALVE MEMBERS FACING EACH OTHER IN SAID CYLINDRICAL CAVITY OF SAID BODY AND BEING SPACED APART SO AS TO BOUND THEREIN A GAP COMPRISING SAID LOAD DUCT PORT, A COMPRESSION SPRING MOUNTED IN SAID CYLINDRICAL CAVITY OF SAID BODY WITHIN SAID GAP AND PRESSING ON THE INTERNAL END OF SAID VALVE MEMBER TO TEND TO INCREASE SAID GAP, ADJUSTABLE SETTING MEANS HAVING AN ARTICULATED CONNECTION TO EACH OF SAID VALVE MEMBERS AND ACTING ON SAID CYLINDRICAL VALVE MEMBERS SOLELY IN AN AXIAL DIRECTION VARIABLY TO LIMIT THE INCREASE OF SAID GAP BY SAID SPRING WITHOUT RESTRAINING SAID VALVE MEMBERS RADIALLY SAID SETTING MEANS BEING MOVABLE AXIALLY WITH SAID VALVE MEMBERS AND BEING ACTUATABLE EXTERNALLY OF SAID BODY TO VARY THE LIMITATION OF SAID GAP BY SAID LIMITING MEANS.