Valves and valve actuation – With correlated flow path – With mounting or support
Patent
1983-01-10
1985-03-26
Nilson, Robert G.
Valves and valve actuation
With correlated flow path
With mounting or support
137527, 137856, 251141, F16K 3106
Patent
active
045068615
ABSTRACT:
A liquid flow control servo valve where the flow controlling element is a magnetically loaded hydrostatic step bearing. An electromagnet has a central liquid passage 3 through it, and flow from this passage 3 is closed off by a magnetically permeable flat plate which has a planar surface matching a corresponding planar surface of the electromagnet. Pressure from passage 3 floats the plate on a thin liquid film in the manner of a hydrostatic step bearing, and the film thickness of this liquid film rapidly adjusts until the hydrostatic bearing pressure force W balances the magnetic forces on the plate. This variation in film thickness adjusts flow rate past the plate. The flow and pressure drop across the hydrostatic bearing plate rapidly adjusts to coil current in the low hysteresis electromagnet, so that P across the plate varies nearly in proportion to coil current I. The geometry of the hydrostatic bearing can be tailored to produce a wide range of viscous damping characterization using conventional squeeze film equations. So long as flow in the step bearing is laminar, the ratio of critical damping produced by the valve in a particular installation is invariant over a wide operating range of flows and fluid viscosities.
REFERENCES:
patent: 322795 (1885-07-01), Coffield
patent: 2947284 (1960-08-01), Nicholson
patent: 3817488 (1974-06-01), Mach
patent: 3873060 (1975-03-01), Espenschield
patent: 4089348 (1978-05-01), Yoshida
Automotive Engine Associates
Nilson Robert G.
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