Pressure reducer for dual master cylinder

Claim 1

A PRESSURE CONTROL COMPRISING: A CONTROL BODY; AN INLET TO SAID CONTROL BODY FROM A PRESSURE SOURCE; AN OUTLET FROM SAID CONTROL BODY HAVING A FIRST CHAMBER COMMUNICATING SAID CONTROL BODY HAVING A FIRST CHAMBER COMMUNICATING WITH SAID INLET AND A SECOND CHAMBER OF LARGER DIAMETER COMMUNICATING WITH SAID OUTLET; PISTON MEANS HAVING A FIRST PORTION SLIDABLY CARRIED IN SAID FIRST CHAMBER AND HAVING A SECOND PORTION RECIPROCABLE IN RESPONSE TO PRESSURE IN SAID SECOND CHAMBER, SAID PISTON MEANS INCLUDING DIFFERENTIAL AREAS AND VALVING MEANS CARRIED IN JUSTAPOSITION TO THE JUNCTURE OF SAID FIRST AND SECOND CHAMBERS; AND SPRING MEANS CARRIED BY SAID PISTON MEANS AND DISPOSED TO URGE SAID PISTON MEANS AWAY FROM A PORTION OF SAID CONTROL BODY IN A MANNER KEEPING SAID SEALING MEANS OUT OF ENGAGEMENT WITH THE JUNCTURE OF SAID FIRST AND SECOND CHAMBERS, A FIRST DIFFERENTIAL AREA OF SAID PISTON MEANS RESPONSIVE TO INLET PRESSURE AND A SECOND DIFFERENTIAL AREA OF SAID PISTON MEANS RESPONSIVE TO OUTLET PRESSURE TO SELECTIVELY POSITION SAID SEALING MEANS RELATIVE TO SAID CONTROL BODY THEREBY MAINTAINING A CONSTANT PRESSURE DIFFERENTIAL AT SAID OUTLET AND INLET WHEN PRESSURE RISES IN SAID SECOND CHAMBER SUFFICIENT TO COMPRESS SAID SPRING MEANS.