Brake pressure proportioning device

Claim 1

A COMPENSATING VALUE DEVICE HAVING AN INLET COMMUNICATING WITH A VARIABLE PRESSURE HYDRAULIC FLUID PRESSURE SOURCE AND OUTLET MEANS COMMUNICATING WITH A FLUID OPERABLE DEVICE, INNER AND OUTER PRESSURE RESPONSIVE ELEMENTS, FORMING A PASSAGE COMMUNICATING WITH SAID INLET, SAID INNER ELEMENT HAVING ONE END SURFACE EXPOSED TO A BIASING FORCE, SAID VALVE DEVICE HAVING A CHAMBER COMMUNICATING WITH SAID PASSAGE AND WITH SAID OUTLET MEANS AND TO WHICH CHAMBER THE OTHER END SURFACE OF SAID INNER ELEMENT IS CONSTANTLY EXPOSED, WHEREBY SAID INNER ELEMENT IS MOVED IN ONE DIRECTION WHEN PRESSURE IN SAID CHAMBER INCREASES TO A PREDETERMINED POINT RELATIVE TO PRESSURE IN SAID INLET AND ENGAGES IN SEALED RELATION WITH SAID OUTER ELEMENT TO PREVENT FLOW OF FLUID RELATION WITH PASSAGE TO SAID OUTLET MEANS, SAID ELEMENTS BOTH HAVING PRESSURE SURFACES SUBJECT TO PRESSURES IN SAID INLET SO AS TO BE MOVABLE AS A UNIT IN THE OTHER DIRECTION BY AN INCREASE IN INLET PRESSURE TO DISPLACE FLUID FROM SAID CHAMBER THROUGH SAID OUTLET MEANS.