Patent ID: 8276612

Claim:
A control pilot valve apparatus, comprising: a housing; a fluid low pressure regulating chamber disposed within the housing, and divided into first and second sub-chambers, each having a fluid inlet, by a first flexible diaphragm; a fluid high pressure regulating chamber disposed within the housing, including a fluid passageway intermediate an inlet and an outlet thereof, and at least partially defined by a second flexible diaphragm; an atmospheric chamber disposed between the fluid low pressure regulating chamber and the fluid high pressure regulating chamber; a poppet slidably disposed within the atmospheric chamber; and a stem extending from the first flexible diaphragm into the atmospheric chamber and movable into contact with the poppet; wherein movement of the poppet by either the stem or the second flexible diaphragm due to fluid pressure variations in the high fluid pressure regulating chamber or the low pressure regulating chamber varies fluid flow between the inlet and the outlet of the fluid high pressure regulating chamber.