Brake booster control valve mechanism

Claim 1

IN A PRESSURE OPERATED POWER UNIT, A VALVE CONTROL MECHANISM, COMPRISING, A HOUSING HAVING A CHAMBER THEREIN, A FIRST WALL MEMBER DIVIDING SAID CHAMBER INTO FIRST AND SECOND COMPARTMENTS AND HAVING AN OPENING THEREIN FOR INTERCONNECTION OF THE TWO COMPARTMENTS, SAID FIRST COMPARTMENT HAVING A FLUID PRESSURE INLET PORT, A VALVE CARRIER SLIDABLE IN SAID HOUSING AND HAVING A FIRST AND SECOND VALVE ELEMENT SPACED AXIALLY THEREON AND POSITIONED AT OPPOSITE SIDES O SAID FIRST WALL MEMBER IN SAID FIRST AND SECOND COMPARTMENTS RESPECTIVELY, SAID VALVE CARRIER HAVING A PASSAGE THEREIN CONNECTING SAID SECOND COMPARTMENT WITH A FLUID PRESSURE EXHAUST PORT, RESILIENT MEANS BIASING SAID CARRIER TO ENGAGE SAID FIRST VALVE ERLEMENT ON SAID FIRST WALL MEMBER TO CLOSE SAID OPENING THEREIN AGAINST OUTFLOW OF PRESSURE FLUID FROM SAID FIRST COMPARTMENT WITH SAID SECOND VALVE ELEMENT BEING SPACED THEREBY FROM SAID FIRST WALL MEMBER, SAID HOUSING HAVING A SECOND WALL MEMBER MOVABLE THEREIN AXIALLY OF SAID VALVE CARRIER, MEANS BIASING SAID SECOND WALL MEMBER TOWARD SAID FIRST WALL MEMBER, DIAPHRAGM MEANS IN SAID SECOND COMPARTMENT BETWEEN SAID HOUSING AND SAID SECOND WALL MEMBER AND EXPOSED TO FLUID PRESSURE IN SAID SECOND COMPARTMENT TO MOVE THEREBY SAID SECOND WALL MEMBER AWAY FROM FIRST WALL MEMBER, DIAPHRAGM MEANS THE FORCE OF SAID BIASING MEANS, AND ACTUATED PLUNGER MEANS SLIDABLE IN SAID SECOND WALL MEMBER ENGAGEABLE WITH SAID SECOND VALVE ELEMENT TO CLOSE SAID PASSAGE IN SAID VALVE CARRIER AND MOVE THE SAME THEREBY TO DISENGAGE SAID FIRST VALVE ELEMENT FROM SAID FIRST WALL MEMBER AND OPEN THEREBY SAID OPENING THEREIN FOR FLUID PRESSURE FLOW FROM SAID FIRST COMPARTMENT TO SAID SECOND COMPARTMENT, AND RESILIENT MEANS NORMALLY BIASING SAID PLUNGER AWAY FROM SAID SECOND VALVE ELEMENT FOR INTERCONNECTION OF SAID SECOND COMPARTMENT WITH SAID EXHAUST PORT THROUGH SAID PASSAGE IN SAID VALVE CARRIER.