Three-way servo deviator for pressurized fluid systems and more specifically for pneumatic braking systems

Claim 1

A THREE WAY SERVO DEVIATOR FOR PRESSURIZED FLUID SYSTEMS, COMPRISING A HOLLOW BODY HAVING CONNECTION FITTINGS ADAPTED TO LEAD TO A SYSTEM AND TO TWO PRESSURIZED FLUID SUPPLY SOURCES, STOP MEANS WITHIN SAID BODY ON OPPOSITE SIDES OIF SAID SYSTEM FITTING, A PISTON IN SAID BODY AND MOVABLE IN RESPONSE TO PRESSURE FROM ONE OF SAID SOURCE FITTINGS TO ONE POSITION IN WHICH FLUID FROM SAID ONE SOURCE FITTING IN COMMUNICATION WITH SAID SYSTEM FITTING AND MOVABLE IN RESPONSE TO PRESSURE FROM THE OTHER OF SAID SOURCE FITTINGS TO ANOTHER POSITION IN WHICH FLUID FROM SAID OTHER SOURCE FITTING IS IN COMMUNICATION WITH SAID SYSTEM FITTING, AND A PAIR OF SEALING GASKETS FIXEDLY MOUNTED WITHIN SAID BODY ON OPPOSITE SIDES OF SAID SYSTEM FITTING, THE LENGTH OF SAID PISTON BEING GREATER THAN THE DISTANCE BETWEEN A STOP MEANS AND THE ADJACENT GASKET SO THAT ONE OF SAID GASKETS SLIDABLY ENGAGES THE EXTERIOR SURFACE OF SAID PISTON WHEN IT IS IN SAID ONE POSITION AND THE OTHER OF SAID GASKETS ENGAGES SAID PISTON WHEN IT IS IN SAID OTHER POSITION, SAID GASKETS BEING SPACED APART A DISTANCE LESS THAN THE LENGTH OF SAID PISTON SO THAT THE PISTON IN MOVING FROM ONE TO THE OTHER POSITION IS ALWAYS ENGAGED BY ONE OR THE OTHER OF SAID GASKETS.