Pressure regulator with damping means

Claim 1

A DEMAND PRESSURE REGULATOR COMPRISING A HOUSING HAVING A SUPPLY PORT, A CONTROLLED PRESSURE PORT AND A RETURN PORT, ALL IN COMMUNICATION WITH AN INTERNAL AXIALLY EXTENDING CHAMBER HAVING OPPOSED CLOSED ENDS, THE CONTROLLED PRESSURE PORT AND ONE OF SAID CLOSED ENDS OF THE CHAMBER OF SAID HOUSING CONNECTED SEPARATELY THROUGH A RESTRICTIVE FLUID PASSAGE; A SPOOL VALVE ADAPTED TO SLIDE IN THE CHAMBER OF SAID HOUSING HAVING ITS PERIPHERAL SURFACE SO FORMED AS TO DEFINE A PASSAGE BETWEEN THE SUPPLY AND CONTROLLED PRESSURE PORTS OF SAID HOUSING UPON TRAVEL IN ONE DIRECTION AND A PASSAGE BETWEEN THE RETURN AND CONTROLLED PRESSURE PORTS OF SAID HOUSING UPON TRAVEL IN THE OTHER DIRECTION, SAID SPOOL VALVE ALSO CONTAINING AN INTERNAL AXIALLY EXTENDING CHAMBER CONNECTED TO THE RETURN PORT OF SAID HOUSING AND ALSO HAVING A RESTRICTIVE FLUID PASSAGE; AN ADJUSTABLE FORCE MEANS BIASING THE SPOOL VALVE IN SAID ONE DIRECTION ATTACHED BY A UNIVERSAL CONNECTION, TO THE SAID SPOOL VALVE, CONTAINED IN THE OTHER OF SAID CLOSED ENDS OF THE INTERNAL CHAMBER OF SAID HOUSING CONNECTED TO THE RETURN PORT BY MEANS OF THE INTERNAL CHAMBER IN THE SAID SPOOL VALVE; WHEREBY A GIVEN PRESSURE CAN BE MAINTAINED IN THE SAID CONTROLLED PRESSURE PORT OVER AN APPRECIABLE FLUID FLOW RANGE AND OSCILLATION IN THE SELECTIVE POSITIONING OF SAID SPOOL VALVE AS A RESULT OF THE INTERACTION BETWEEN THE ADJUSTABLE FORCE MEANS AT ONE END AND THE FLUID PRESSURE CONTAINED IN THE OTHER CLOSED END OF THE INTERNAL CHAMBER OF SAID HOUSING, IS DAMPENED BY THE COACTION OF THE TWO RESTRICTIVE FLUID PASSAGES OF THE SAID SPOOL VALVE AND SAID HOUSING RESPECTIVELY.