Control of liquid distribution

Claim 1

A PRESSURE CONTROLLER IN THE FORM OF A SLEEVE VALVE, FOR CONTROLLING THE PRESSURE IN A LIQUID SUPPLY PIPE DOWNSTREAM OF THE VALVE, SAID VALVE COMPRISING A HOUSING HAVING AN INLET AND AN OUTLET ADAPTED FOR CONNECTION INTO SAID SUPPLY PIPE, A VALVE SLEEVE ACTUALLY MOVABLE WITHIN SAID HOUSING HAVING AN OPEN POSITION PROVIDING A PASSAGE FOR LIQUID FROM SAID INLET TO SAID OUTLET, A SEATING FOR SAID VALVE WITHIN SAID HOUSING, TWO SPACED DEEPLY CORRUGATED DIAPHRAGMS EACH HAVING ONE DEEP ANNULAR CORRUGATION CONFINED BETWEEN AN INNER SURFACE OF SAID HOUSING ON THE ONE HAND AND CYLINDRICAL SURFACES ON SAID VALVE SLEEVE ON THE OTHER HAND, SAID CORRUGATIONS EXTENDING IN OPPOSITE DIRECTIONS, AND EACH SAID DIAPHRAGM BEING CLAMPED TO SAID HOUSING AND TO SAID SLEEVE, AN AIR RESERVOIR WITHIN SAID HOUSING ON THE CONCAVE SIDE OF ONE OF SAID DIAPHRAGMS, MEANS FOR MAINTAINING A CONSTANT THOUGH ADJUSTABLE AIR PRESSURE WITHIN SAID RESERVOIR, AND MEANS FOR SUBJECTING THE CONCAVE SIDE OF THE OTHER OF SAID DIAPHRAGMS TO THE PRESSURE OF LIQUID ON THE DOWNSTREAM SIDE OF SAID VALVE, SAID VALVE SLEEVE BEING SO DISPOSED WITHIN SAID HOUSING IN RELATION TO SAID INLET AND SAID OUTLET THAT THE VALVE CAN LIE IN LINE WITH SAID LIQUID SUPPLY PIPE, AND SAID VALVE SLEEVE BEING AXIALLY MOVABLE WITHIN SAID HOUSING FROM SAID OPEN POSITION TO A CLOSED POSITION UNDER THE JOINT CONTROL OF SAID TWO DIAPHRAGMS IN RESPONSE TO LIQUID PRESSURE IN EXCESS OF A VALUE DETERMINED BY THE AIR PRESSURE IN SAID RESERVOIR, SAID ONE DIAPHRAGM SUBJECTED TO AIR PRESSURE BEING NEARER TO SAID OUTLET AND HAS ITS CORRUGATION EXTENDING IN THE DOWNSTREAM DIRECTION.