| 摘要 |
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.
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