| 摘要 |
<p>1,080,067. Valves. GARLOCK Inc. March 9, 1966 [March 9, 1965], No.10397/66. Heading F2V. A replaceable corrosion-resistant valve unit for a butterfly valve comprising a valve liner 15 of substantially incompressible synthetic organic polymer and a butterfly disc 13 adapted to pivot within the liner, the disc being encapsulated in an incompressible synthetic organic polymer having slightly larger diameter than the internal diameter of the undistorted liner, and a resilient ring member 14 around the liner, the ring acting in compression between the liner and valve body 10, when the valve unit is installed in the cylinderical bore 12 of the valve body, to back up the liner and permit resilient distortion thereof when the disc is in the closed position. The liner may have a groove in a rib on its internal surface into which the perimeter of the disc seals on closure. The resilient ring may be formed from, natural or synthetic rubbers; neoprene; fluoroelastomers; compression springs; " Flexon " (Trade Mark); pile or flock; foam; a bladder filled with air; a permanent gas or a " liquid spring " fluid. The polymer may be polytetrafluoroethylene, fluoroethylene propylene, vinylidene fluoride resins and copolymers; polyethylene, polypropylene and vinyl polymers. Adjustment of the fit between the disc and liner is by means of tension fasteners 11. The upper valve stem is held in place by a pin inserted in hole 18 and sealing rings are positioned between the disc and liner around the pivots.</p> |
