| 摘要 |
<p>A shuttle valve includes a tubular body having two, coaxial, inlet ports at its ends, and a transverse outlet port at its side. An internally threaded connector ring is secured over each port by cap screws. A cage having an external radial flange is telescopically disposed within each inlet port, with its flange clamped between the adjacent connector ring and an outwardly facing shoulder in the body. O-rings seal the three connector rings and the two cages to the body. Each cage has an inwardly protuberant O-ring secured at its outer end providing a valve seat. Inwardly of the seat each cage is axially grooved, providing flow passages. The ribs left between the grooves provide guide bearings. Adjacent the inner end of each cage are formed stop shoulders. Inwardly of the stop shoulders is a skirt or lip forming a dashpot cylinder. A shuttle in the form of a cylindrical plug tapered at each end is axially slidably disposed inside the body within the cages, being supported and guided by the bearing portions thereof, and adapted alternately to engage the seat of one or the other of the cages according to whether the pressure on one end of the shuttle or the other is higher. A collar around the middle of the shuttle provides a dashpot piston.</p> |
