Source selecting pressure regulator

Claim 1

A PRESSURE OPERATED AUTOMATIC SELECTOR VALVE COMPRISING A CASING HAVING AN ELONGATED PASSAGE THEREIN, ONE END OF SAID PASSAGE BEING ENLARGED AND COMPRISING A BALANCING CHAMBER, A MOVABLE PARTITION MOUNTED WITHIN SAID BALANCING CHAMBER AND DIVIDING IT INTO INNER AND OUTER PORTIONS SEALED FROM ONE ANOTHER BY SAID MOVABLE PARTITION, FIRST SPRING MEANS WITHIN SAID OUTER PORTION CONNECTED TO SAID MOVABLE PARTITION AND URGING IT AXIALLY INWARDLY, THE OTHER END OF SAID PASSAGE BEING SEPARATED FROM SAID ONE END BY A TRANSVERSE WALL HAVING A CENTRAL PASSAGE THERETHROUGH COMPRISING A PRIMARY VALVE SEAT, A VALVE STEM SECURED TO SAID MOVABLE PARTITION AND PROJECTING AXIALLY THROUGH THE CENTRAL PASSAGE IN SAID PRIMARY VALVE SEAT IN SPACED RELATION THERETO, A HOLLOW SECONDARY VALVE CASING EXTENDING INTO THE OTHER END OF SAID FIRST MENTIONED PASSAGE AND ADJUSTABLY CONNECTED THERETO FOR AXIAL ADJUSTMENT RELATIVE TO SAID FIRST MENTIONED CASING, THE INNER END OF SAID HOLLOW SECONDARY VALVE CASING COMPRISING A SECONDARY VALVE SEAT HAVING A PORT THERETHROUGH AND RECEIVING THERETHROUGH THE FREE END OF SAID VALVE STEM IN SPACED RELATION, A SECONDARY VALVE MEMBER AXIALLY MOVABLE WITHIN SAID SECONDARY CASING, SECONDARY VALVE SPRING MEANS WITHIN SAID SECONDARY VALVE CASING URGING SAID SECONDARY VALVE MEMBER TOWARD SAID SECONDARY VALVE SEAT SO AS TO CLOSE THE PORT THERETHROUGH, THE SPACE BETWEEN THE INNER END OF SAID SECONDARY VALVE CASING AND SAID PRIMARY SEAT COMPRISING A PRIMARY VALVE CONTROL CHAMBER AND THE SPACE BETWEEN THE SECONDARY VALVE MEMBER AND THE END OF SAID SECONDARY VALVE CASING COMPRISING A SECONDARY CONTROL CHAMBER CONNECTED TO SAID PRIMARY CONTROL CHAMBER BY MEANS OF SAID PORT, A PRIMARY VALVE MEMBER SECURED ON SAID STEM WITHIN SAID PRIMARY CHAMBER, SEPARATE PRIMARY AND SECONDARY CONDUITS EXTENDING GENERALLY RADIALLY THROUGH SAID FIRST MENTIONED