| 摘要 |
1347926 Valves DRESSER INDUSTRIES Inc 27 Jan 1972 [24 Feb 1971] 3838/72 Heading F2V A double beat valve comprising an inlet 15 and outlet 17, has two valve discs 28, 29 attached to a tubular stem 46 which in turn is secured to an axially adjustable actuating rod 33 by means of a threaded plug 64. The radial clearance shown between rod 33 and stem 46 permits compensating flexure of the rod in the event of eccentricity occurring during closure of the valve. Moreover, bearing assemblies 47, 48 are mounted by spring washers 50 to thereby permit slight radial movement of the stem 46. The stem 46 can be moved axially relative to rod 33 by adjustment of plug 64 to accurately locate the discs axially relative to their seats 25, 26. The valve body 10 and the stem 46 are preferably of the same material, e.g. bronze, to avoid relative thermal expansion. The arrange. ment of the discs 28, 29 may be inverted so that each disc co-operates with the underside of its respective seat. |
