Fluid regulating valve

Claim 1

A FLUID-REGULATING VALVE COMPRISING: MEANS DEFINING AN INLET FLUID CHAMBER; MEANS DEFINING AN OUTLET FLUID CHAMBER SUBSTANTIALLY AXIAL TO AND REARWARDLY OF SAID INLET CHAMBER; SLEEVE MEANS FIXED SUBSTANTIALLY AXIALLY TO SAID CHAMBERS, SAID SLEEVE MEANS HAVING AT LEAST ONE PERIPHERAL GROOVE IN THE END ADJACENT SAID INLET CHAMBER AND BEING OPEN AT SAID END AND HAVING LATERAL PORTS THEREIN NEAR SAID END FOR PASSAGE OF FLUID FROM SAID INLET CHAMBER THROUGH SAID OPEN END AND SAID PORTS INTO SAID OUTLET CHAMBER; PISTON MEANS HAVING ITS FORWARD END EXPOSED TO FLUID PRESSURE WITHIN SAID INLET CHAMBER AND HAVING A CIRCUMFERENTIAL SURFACE ADJACENT SAID END WHICH ENGAGES SAID SLEEVE MEANS ADJACENT THE GROOVE IN SAID SLEEVE MEANS, SAID PISTON MEANS BEING AXIALLY SLIDABLE WITHIN SAID SLEEVE MEANS SO AS TO OPEN AND CLOSE SAID PORTS AND FORMING WITHIN SAID SLEEVE MEANS AN INTERMEDIATE CHAMBER; RETAINER RING MEANS ENGAGING THE INNER SURFACE OF SAID INLET CHAMBER AND MOUNTED FORWARDLY OF SAID SLEEVE MEANS AND SAID PISTON MEANS, SAID RETAINER RING MEANS HAVING AT LEAST TWO PERIPHERAL NOTCHES IN THE REAR SURFACE THEREOF FACING THE GROOVE IN SAID SLEEVE MEANS THEREBY FORMING A PLURALITY OF AXIALLY SPACED COMMUNICATING CONCENTRIC CHAMBERS ADJACENT SAID CIRCUMFERENTIAL SURFACE OF SAID PISTON MEANS; A FIRST FIXEED O-RING SEAL IN THE REARMOST OF SAID CONCENTRIC CHAMBERS CONTACTING THROUGHOUT ITS ENTIRE CIRCUMFERENCE THE GROOVE IN SAID SLEEVE MEANS AND THE REARMOST NOTCH IN SAID RETAINER RING MEANS, SAID FIRST O-RING SEAL BEING ENGAGEABLE BY THE FORWARD END OF SAID PISTON MEANS; A SECOND FIXED O-RING SEAL IN THE FORWARD CONCENTRIC CHAMBER CONTACTING THROUGHOUT ITS ENTIRE CIRCUMFERENCE THE INNER SURFACE OF SAID INLET CHAMBER, THE OPEN END OF SAID SLEEVE MEANS, THE FORWARD NOTCH IN SAID RETAINER RING MEANS AND A CIRCUMFERENTIAL PORTION OF THE O-RING SEAL IN THE NEXT REARWARD CON CENTRIC CHAMBER; AND MEANS FOR DELIVERING FLUID PRESSURE TO SAID INTERMEDIATE CHAMBER WHEREBY MOVEMENT OF SAID PISTON IS RESPONSIVE TO FLUID PRESSURE DIFFERENTIAL ACROSS OPPOSITE ENDS THEREOF.