| 摘要 |
<p>Fluid valving method and mechanism, wherein preferably coaxial piston-like annular outer (20) and core inner (30) valve members are adapted to move to and fro slidably relative to one another, balanced (or intentionally unbalanced) as to fluid forces applied thereto, and are readily adjustable to bar upstream-to-downstream fluid flow when juxtaposed into mutually seated closed valve position and, alternatively, to enable flow therethrough when spaced apart in mutually unseated open valve position.</p> |
