| 摘要 |
<p>The rotary control valve (1) comprises a casing (2) having a pair of axially-opposed ports (13,13'1. A valve chamber (15) is rotatably mounted in the casing. A stem (8) adjustably rotates the valve chamber for controlling the flow through the ports. Chamber (15) has a pair of axially-opposed, off-center orifices (20,20'), each being contiguous to and movable into and out of partial and full registration with its associated port. An off-center tube (26) is disposed inside chamber (15) and extends between the orifices (20.20'). In chamber (15) is a pressure-reducing medium (30) which preferably includes a plurality of stacked, axially-spaced discs. Each disc has a pattern of holes for dividing the flow thereacross.</p> |
