Patent ID: 8695630
Filing Date: 2014-04-15
Classification: F16K,G05D,Y10T

Abstract:
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 attached 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 attached to the second flexible diaphragm; wherein the yoke and the stem move independent of one another and cooperatively form a variable fluid passageway between the first and second ports of the first variable chamber; and wherein the stem includes an aperture variably alignable with a yoke aperture as the yoke and stem move relative to one another to define the variable fluid passageway.