Brake pressure proportioning and metering valve

Claim 1

A PROPORTIONING AND METERING DEVICE FOR A VEHICULAR HYDRAULIC BRAKE SYSTEM COMPRISING A BODY HAVING A BORE THEREIN AND AN INLET OPENING AND FIRST AND SECOND OUTLET OPENINGS, FIRST AND SECOND SHOULDERS IN SAID BORE, PISTON MEANS SLIDABLY DISPOSED IN SAID BORE AND HAVING A FIRST PASSAGE MEANS THERETHROUGH COMMUNICATING SAID INLET AND FIRST OUTLET OPENING AND FORMING WITH SAID BORE A SECOND PASSAGE MEANS COMMUNICATING SAID INLET AND SECOND OUTLET OPENING, FIRST VALVE MEANS CARRIED BY SAID PISTON ADAPTED TO OVERLAY SAID FIRST PASSAGE MEANS FOR PREVENTING THE FLOW OF FLUID TO SAID FIRST OUTLET AND HAVING A PORTION POSITIONED TO ENGAGE THE FIRST SHOULDER, SECOND VALVE MEANS CARRIED BY SAID PISTON ADAPTED TO ENGAGE SAID SECOND SHOULDER FOR PREVENTING THE FLOW OF FLUID TO SAID SECOND OUTLET, RESILIENT MEANS ASSOCIATED WITH SAID PISTON NORMALLY HOLDING SAID FIRST VALVE MEANS IN ENGAGEMENT WITH SAID FIRST SHOULDER TO OPEN SAID FIRST PASSAGE MEANS AND SAID SECOND VALVE MEANS IN ENGAGEMENT WITH SAID SECOND SHOULDER, SAID PISTON BEING RESPONSIVE TO A FIRST INLET PRESSURE TO OPEN SAID SECOND VALVE MEANS, AND TO A RANGE OF INLET PRESSURES GREATER THAN SAID FIRST INLET PRESSURE FOR OPENING AND CLOSING SAID FIRST VALVE MEANS TO DELIVER FLUID TO SAID FIRST OUTLET AT A PREDETERMINED PRESSURE RELATIONSHIP TO THE FLUID DELIVERED TO SAID SECOND OUTLET.