Means for controlling pressures in pneumatic suspension cushions of a tractor-trailer combination

Claim 1

IN AN ASSEMBLY OF THE CHARACTER DESCRIBED, A HOUSING, A SERIES OF NORMALLY SPRING CLOSED BALL VALVES HAVING SEATS ANNULARLY SPACED APART FROM ONE ANOTHER ABOUT THE HOUSING WITH THEIR AXES IN A COMMON PLANE, SAID VALVES PROJECTING INTO THE CONFINES OF THE HOUSING AND COMPRISING A PRESSURE INLET VALVE SERVING WHEN OPEN TO ADMIT PRESSURE INTO THE HOUSING, A PRESSURE FEED VALVE POSITIONED CONTIGUOUS TO AND ON EACH SIDE OF SAID INLET VALVE, AND A VENT VALVE POSITIONED CONTIGUOUS TO EACH OF THE FEED VALVES AND ON THE SIDE THEREOF REMOTE FROM THE INLET VALVE, A MANUALLY OPERABLE SPINDLE COAXIAL WITH THE HOUSING, AND A ROTOR MOUNTED ON SAID SPINDLE AND HAVING TWO KNUCKLES ANNULARLY SPACED APART A DISTANCE EQUAL TO THE SPACING OF ANY TWO ADJACENT VALVES TO PERMIT SAID KNUCKLES, THROUGH ROTATION OF THE ROTOR, TO SIMULTANEOUSLY UNSEAL ANY TWO ADJACENT VALVES AND TO STRADDLE ANY ONE OF SAID VALVES WITHOUT OPERATING ANY OF THEM.