Fluid handling – Line condition change responsive valves – Pilot or servo controlled
Patent
1990-12-28
1991-09-24
Cohan, Alan
Fluid handling
Line condition change responsive valves
Pilot or servo controlled
1374875, 200 83A, G05D 706
Patent
active
050506340
ABSTRACT:
A very low differential pressure switch for detecting pressure differential across two points of a pressurized system. A flexible diaphragm divides two cavities which are exposed to fluid pressures across two points of the pressurized system, and moves a sensor actuating target axially against a compression spring relative to the sensed differential pressures. The switch has a proximity sensor responsive to the axial location of the target to produce an output indicative of a pressure differential condition between the two cavities. The switch has a selected pressure sensitivity and volumetric displacement threshold dependent in part on the cross-sectional area of the flexible diaphragm, size of the compression spring and on the distance between the diaphragm and the proximity sensor.
REFERENCES:
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patent: 4436110 (1984-03-01), Leeuwma
patent: 4721128 (1988-01-01), Padilla
patent: 4796651 (1989-01-01), Ginn
Turck, "Proximity Sensor Manual," cover and pp. A8-A11, B83, B84, B87, B88 (Oct. 1988).
Microswitch, "900 Series Nickel-Plated Proximity Sensors," cover and pp. 2-8.
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United Electric Controls Co., "UE Electromechanical Products," cover, inside page and pp. 28-33.
Cohan Alan
Hasstech, Inc.
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