Patent ID: 9249896
Filing Date: 2016-02-02
CPC Classification: F16K,G05D,Y10T

Claim Text:
1. A control pilot valve apparatus, comprising: a housing; a first flexible diaphragm disposed within the housing; a second flexible diaphragm disposed within the housing in spaced relation to the first flexible diaphragm; a first variable chamber between and at least partially defined by the first and second flexible diaphragms; a first fluid port through the housing in fluid communication with the first variable chamber; a second fluid port through the housing in fluid communication with the first variable chamber; a yoke coupled to the first flexible diaphragm; a second variable chamber defined at least in part by the second flexible diaphragm; a third fluid port through the housing in fluid communication with the second variable chamber; and a stem coupled to the second flexible diaphragm; wherein the yoke and the stem independently, slidably move relative to one another to cooperatively form a variable fluid passageway between the first and second ports of the first variable chamber; and wherein fluid in the first chamber contacts and acts upon both of the first and second diaphragms.