Valve controlled by fluid

Details Valve controlled by fluid Valve controlled by fluid

F - Mech Eng,Light,Heat,Weapons

16

K

F16K 31/08 (2006.01) F16K 31/16 (2006.01) F16K 31/385 (2006.01)

Patent

CA 2163685

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. - 12 -

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