Bi-valve

Claim 1

A TRI-POSITION VACUUM VALVE ACTUATOR COMPRISING: A VALVE ACTUATOR HAVING A VALVE SECTION AND AN ACTUATOR SECTION, SAID VALVE SECTION HAVING FIRST AND SECOND VALVE CHAMBERS FORMED THEREIN AND HAVING AN AIR-FLOW PASSAGEWAY INTERCONNECTING SAID FIRST AND SECOND VALVE CHAMBERS AND HAVING FIRST AND SECOND VALVE SEATS FORMED AT THE JUNCTION OF SAID AIR-FLOW PASSAGEWAY WITH SAID FIRST AND SECOND VALVE CHAMBERS, RESPECTIVELY, SAID VALVE SECTION HAVING AN INLET COMMUNICATING FROM OUTSIDE SAID VALVE SECTION TO SAID AIR-FLOW PASSAGEWAY, SAID ACTUATOR SECTION HAVING FIRST AND SECOND ACTUATOR CHAMBERS FORMED THEREIN AND A POWER DIAPHRAGM PROVIDING A COMMON WALL INTERMEDIATE SAID FIRST AND SECOND ACTUATOR CHAMBERS, SAID FIRST AND SECOND VALVE CHAMBERS BEING COMMUNICABLE WITH SAID FIRST AND SECOND ACTUATOR CHAMBERS, RESPECTIVELY FIRST AND SECOND VALVE MEANS OPERABLY DISPOSED IN SAID FIRST AND SECOND VALVE CHAMBERS, RESPECTIVELY, FOR OPENING AND CLOSING THE COMMUNICATION OF SAID AIR-FLOW PASSAGEWAY TO SAID ASSOCIATED VALVE CHAMBERS, RESILIENT MEANS DISPOSED WITHIN SAID AIR-FLOW PASSAGEWAY AND INTERCONNECTING SAID FIRST AND SECOND VALVE MEANS AND URGING THE SAME INTO CLOSED POSITIONS AT SAID FIRST AND SECOND VALVE SEATS, RESPECTIVELY, MEANS FOR SELECTIVELY VENTING SAID VALVE CHAMBERS TO THE ATMOSPHERE, MEANS FOR ENERGIZING SAID FIRST AND SECOND VALVE MEANS INDEPENDENTLY INTO OPENED POSITIONS, AND MEANS FOR APPLYING A FLUID HAVING A PRESSURE DIFFERENTIAL RELATIVE TO ATMOSPHERE TO SAID INLET, WHEREBY THE SELECTIVE OPENING OF SAID AIR-FLOW PASSAGEWAY TO ONE OF SAID VALVE CHAMBERS DEVELOPS A PRESSURE DIFFERENTIAL ACROSS SAID POWER DIAPHRAGM FOR MOVING THE SAME WITHIN SAID ACTUATOR SECTION.