Rotary valve having a fluid bearing

Details Rotary valve having a fluid bearing Rotary valve having a fluid bearing

1996-06-24

1999-05-11

Rivell, John

Fluid handling

With cleaner, lubrication added to fluid or liquid sealing...

Liquid supplied at valve interface

13724623, 251283, 384107, F16K5/22;39/00

Patent

active

059017376

ABSTRACT:
An improved rotary valve having a gas bearing which prevents contact between the rotating piston and the cylindrical housing. The same working gas which the rotary valve controls is accumulated in an accumulation chamber. Fluid flow passageways, having a fixed flow resistance along their length, connect the accumulator chamber with a plurality of cavities formed on the cylinder wall of the housing. Pressurized gas is thereby pumped into the clearance gap between the piston wall and the cylinder wall, increasing in pressure where the piston wall comes closer to the cylinder wall, and decreasing in pressure where the clearance gap increases. The net effect is a centering force applied to the piston whenever it varies from an equilibrium position.

REFERENCES:
patent: 619594 (1899-02-01), Martin
patent: 2707613 (1955-05-01), Wheatley
patent: 3205668 (1965-09-01), Gifford
patent: 3443593 (1969-05-01), Colombo
patent: 3490819 (1970-01-01), Greenberg
patent: 3625015 (1971-12-01), Chellis
patent: 3692041 (1972-09-01), Bondi
patent: 3747639 (1973-07-01), Eickmann
patent: 4193644 (1980-03-01), Miyashita et al.
patent: 4372338 (1983-02-01), Efferson
patent: 5335505 (1994-08-01), Ohtani et al.
patent: 5412952 (1995-05-01), Ohtani et al.

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