Flow switch

Details Flow switch Flow switch

1989-10-30

1991-02-26

Macon, Robert S.

Electricity: circuit makers and breakers

Fluid pressure

Flow-responsive type

200 82E, H01H 3538

Patent

active

049963961

ABSTRACT:
The invention contemplates a flow-switch construction of the straight flow-through variety wherein a magnet-bearing piston is displaced in response to a hydraulic-flow condition and in the displacement is caused to operate a magnetic-reed switch. The piston has piloted guidance in a first longitudinal portion of an elongate bore but is characterized by one or more straight channels in its periphery, whereby the piston per se constitutes relatively little restriction to flow; the downstream end of the piston carries a metering disc which substantially resists channel flow as long as the metering disc has predetermined close-clearance relation with the first longitudinal portion of the bore. Immediately downstream from the first longitudinal portion, the bore is substantially enlarged in a second longitudinal portion, whereby upon piston displacement such as to advance the metering disc into the second longitudinal portion, the metering disc is by-passed and unrestricted straight-through flow proceeds to the outlet end of the bore.

REFERENCES:
patent: 2963563 (1960-12-01), Patterson
patent: 3327079 (1967-06-01), Widl
patent: 4213021 (1980-07-01), Alexander

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