Importance

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Abstract

A differential pressure switch assembly that includes a conventional snap action switch for controlling the off-on modes of operation of state of the art equipment, which assembly comprises a high pressure plate that defines the high pressure cavity and a high pressure port of restricted size therefor, a low pressure plate that defines a first subchamber of the assembly low pressure cavity and a low pressure port therefor, a diaphragm clamped between the high and low pressure plates and separating the switch assembly high and low pressure cavities, a piston mounted in the low pressure plate for movement perpendicularly of the assembly diaphragm and biased toward the diaphragm by an adjustable range spring device, the range spring of which can be adjusted to provide the set point for the switch assembly, with the range spring device being formed to dispose the range spring in a second low pressure subchamber that is in open communication with the first low pressure subchamber to form a composite low pressure chamber, and with the low pressure plate journaling a rotary take out shaft that is coupled to the piston within the low pressure composite chamber and actuates a mechanical mechanism for utilizing the diaphragm motion for a particular set point of a switch assembly to actuate the snap action switch of same free of high deadband.

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First Claim