| 摘要 |
<p>A gas pressure reduction valve in which coaxial to the perforated valve cage (7) there are mounted several concentric cylindrical rings (20)-(23) having corresponding holes (24) of increasing diameter from the inner ring to the outer ring, said holes communicating with horizontal circumferential channels provided in the outer surface of said rings in correspondence with the circumferences along which said holes are provided, the holes of each ring being offset by one half of an angular pitch from the corresponding holes of the adjacent rings, the vertical fixed tubular seat (6) of the valve being covered with sound-absorbent material (15). <IMAGE></p> |
