Direct mount pressure control with a field adjustable trip point

Details Direct mount pressure control with a field adjustable trip point Direct mount pressure control with a field adjustable trip point

1992-10-15

1994-04-19

Pellinen, A. D.

Electricity: circuit makers and breakers

Fluid pressure

Diaphragm

200835, H01H 3540

Patent

active

053047591

ABSTRACT:
A pressure control for use in applications such as refrigeration, air conditioning and ice generating machinery includes a highly accurate snap acting switch, field adjustable trip points and reset points and a reference scale. The trip point is adjusted by means of an adjustment screw, while the reset point is adjusted by changing the differential, or the difference between the trip point and reset point. The differential is adjusted by adjusting the amount of "lost motion" within the control by employing an actuator which includes a cam surface and means for changing the position of the cam surface.

REFERENCES:
patent: 2291554 (1942-07-01), Muchow
patent: 2789173 (1957-04-01), Kaminky
patent: 3194916 (1962-03-01), Vischer, Jr.
patent: 3233055 (1966-02-01), Russell
patent: 5120915 (1992-06-01), Doherty

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