Valve controlled by fluid

Details Valve controlled by fluid Valve controlled by fluid

1995-11-07

1998-06-02

Chambers, A. Michael

Valves and valve actuation

Fluid actuated or retarded

Pilot or servo type motor

251 45, 251 65, F16K 3140

Patent

active

057588635

ABSTRACT:
A permanent magnet actuated pilot operated valve having a central permanent magnet disposed within an annular axially polarized magnet. The annular magnet is attached to a pressure responsive membrane moveably responsive to a fluid pressure control signal. Movement of the annular permanent magnet effects movement of the central magnet, either by attraction or repulsion depending on whether like or opposite poling is employed. Movement of the central magnet effects opening of a pilot valve which creates a pressure differential which in turn causes a second pressure responsive membrane to move and effect opening of a main valve. Change in the fluid pressure control signal causes the annular magnet to return to its original position thereby effecting reverse movement of the central magnet and closure of the pilot valve. A bleed hole causes pressure equalization across the second membrane and reclosure of the main valve.

REFERENCES:
patent: 2629401 (1953-02-01), Miller
patent: 3376013 (1968-04-01), Mallett
patent: 5169117 (1992-12-01), Huang

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