Hydraulic pressure regulator

Claim 1

A HYDRAULIC REGULATOR FOR INSERTION BETWEEN A HYDRAULIC GENERATOR AND A RECEIVING SYSTEM CONNECTED TO THE DELIVERY SIDE OF THE GENERATOR SO AS TO MAINTAIN THE DELIVERY PRESSURE OF THE GENERATOR CONSTANT, SAID REGULATOR COMPRISING MEANS DEFINING A BODY, A FIXED SLEEVE MOUNTED IN THE BODY AND HAVING AN INNER CHAMBER, TRANSVERSE PORTS FORMED IN THE SLEEVE, A CONDUIT COMMUNICATING WITH ONE OF THE PORTS AND ADAPTED TO BE CONNECTED TO THE DELIVERY SIDE OF THE GENERATOR, A SECOND CONDUIT COMMUNICATING WITH THE OTHER OF SAID PORTS AND ADAPTED TO BE CONNECTED TO THE RECEIVING SYSTEM, WHEREBY THE FLUID IN SAID CONDUITS FLOWS CONSTANTLY THROUGH THE SLEEVE BY WAY OF THE PORTS, A SLIDE VALVE AXIALLY SLIDABLE IN THE SLEEVE, ESCAPE ORIFICES PROVIDED IN THE SLEEVE, AN ESCAPE CONDUIT AT ATMOSPHERIC PRESSURE IN COMMUNICATION WITH THE INNER CHAMBER BY WAY OF THE ORIFICES, A MASKING PORTION PROVIDED ON THE SLIDE VALVE AND CO-OPERATING WITH THE ORIFICES SO AS TO CLOSE TO A VARYING EXTENT THE FLUID PASSAGE SECTION OF THE ORIFICES IN ACCORDANCE WITH THE FLUID PRESSURE PREVAILING IN THE INNER CHAMBER, A MODULATED PRESSURE CHAMBER IN THE BODY, A VARIABLE-SECTION NOZZLE PUTTING THE MODULATED PRESSURE CHAMBER IN COMMUNICATION WITH THE INNER CHAMBER, THE VARIABLE-SECTION NOZZLE COMPRISING AN END PORTION OF THE SLIDE VALVE AND A SEATING FIXED IN THE BODY, THE END PORTION OF THE SLIDE VALVE HAVING A CROSS-SECTIONAL SIZE WHICH VARIES AXIALLY OF THE SLIDE VALVE, A SPRING DISPOSED IN THE BODY AND BEARING AGAINST AND BIASING THE SLIDE VALVE TO MOVE AXIALLY IN THE SLEEVE, THE PRESSURE OF THE FLUID IN THE MODULATED PRESSURE CHAMBER ACTING ON SAID END PORTION OF THE VALVE IN THE SAME DIRECTION AS THE PRESSURE OF THE FLUID IN THE INNER CHAMBER WHICH ACTS ON ANOTHER PORTION OF THE VALVE SO THAT THE ACTIONS OF SAID PRESSURES ARE ADDED TOGETHER, SAID SPRING BIASING THE VALVE IN A DIRECTION OPPOSED TO SAID ACTIONS, THE REGULATOR FURTHER COMPRISING A CALIBRATED FIXED-SECTION ORIFICE FORMED IN SAID END PORTION OF THE SLIDE VALVE, AND MEANS DEFINING A PASSAGEWAY PUTTING THE SIDE OF THE FIXED-SECTION ORIFICE REMOTE FROM THE MODULATED PRESSURE CHAMBER IN COMMUNICATION WITH THE ESCAPE CONDUIT WHEREBY THE MODULATED PRESSURE CHAMBER IS IN PERMANENT COMMUNICATION WITH THE ESCAPE CONDUIT.