【正文】 wit h t he m echanical design r equir em ents, but also f acilt ate t he m anufact uring process of the par ts, in line wit h t he econom ic, easy processing characterist ics, m at er ial select ion of Duralumin alloy. Surf ace aft er pro Sealing should have enough pr eload, is a t wosided m andat ory sealing. Usualy in connect ion wit h a ball in one of the upper and or lower stem is equipped wit h t hrust bear ing. Float ing ball valve design should f ocus on sealing mat er ial can wit hstand t he spher e of medium load. Because spher es wor k under medium load t o export all seals, t herefor e, this f loat ing spher e is widely used in low pr essur e ball valves. In additon, t he floating ball valve bal is f loat ing, under media pr essur e, sphere produces a cert ain amount of displacement and pression on the sealing r ing on t he expor t side, ensure t he outlet seal, is a single m andatory sealing. Summary: select a fixed bal valves bal valves f or tooling. Purchase access t o ball valve, type: Q617F16C DN20, explains: Q ball valve, 6 pneumat ic dr ive (wr it e 3 Turbo tr ansmission, 9 is t he elect ric dr ive) , 1 scr ew t hread ( wr ot e 4 f lange conect ion), 7 f ixed ( writ e 1 is f loat ing), soft seal PTFE f ( writ ten h is hard keys Select ion of air pressors， Because t he par ts are not very big, bubbles was obser ved less obvious to t he naked eye, so f inding ways t o buble became obvious, Icame up wit h a buble m et hod is in t he fixt ur e sur face. I n this way, if t here is a bubble, it wil bee ver y apparent . Can be well observed. gas tight ness t ols using m et hod 1, put he par ts int o f ixtur es. 2, t he fixt ur e in t he sink. 3, open t he bal valve f or gas. 4, aft er the t esting is plet ed, opening another ball valves f or gas. 5, r emove t he welding part s, repeat t he st eps above, f or examination. 6 conclusion t his art icle pleted bef ore a rockets Cap welding process pr eparat ion and inspection of welded air t ight f ixtures in t wo part s, the main t asks are as folows: ( 1) by analyzing t he part s of t he r ole, explains the im port ance of t he f ront cover, it 39。t he par t s f or high volume part s r equir es a lot of t est ing. 4, str uctur e should be simple and st raight forward, because you want t o see whet her t here is air bubbles in t he water. Preliminar y design t est gas key sex t oling str uct ur e f olowing f igur e by shows Qian cover 2, and sealed par ts 1 3, and sealed cir cle 1 sealed cir cle 2 5, and sealed part s 2 as Shang f igure by shows: ear ly set down of gas key sex t oling f or Shang figur e by shows, sealed parts 1 and 2 t hrough t hread conect ion, can demolit ion, sealed par ts 1 and Qian cover contact place has sealed cir cle, prevent gas leak, a, direction t hat f or gas enter ed dir ection. The str uctur e has m any f laws t o be improved include t he f olowing: seal par t f or t ubular, clamp, scr ewed toget her . Dir ections f rom a gas, by what means and pipe conect ions. I mproved methods, tube shaped par ts dif ficult o clamp and t ight en, you can change it s shape, hexagonal or ect angular, and the import ation of gas hoses can be used, so sealing par ts 2A direction can make a t hread and hose connections, wil ensur e t he gas input , and dependin g on t he inspect ion r equir ements, sealing part s 2 and hose connection f or a long tim e, so t hat you can use wit h bat ch inspection. I mproved sealing part s 1 and 2 as shown in t he figure are as folows: 5. 2. 2 air t ight tooling design str ucture design and calc ulat ion of t he m ost size, are calculat ed according to size. Sealing diameter of parts 1 26mm according t o t he t op diameter of 20mm it . Total widt h 136mm can m eet the nat ional st andard in t he hexagon of hexagons f ixtur e clamping requir ement s. Seal part s 55mm weld can m eet the lengt h requir ement . Thickness of 7mm and 18m m were acquired under t he par ts aft er welding height, can meet t he r equir ements covered par ts. Seal par t 1 int ernal dim ensions 94mm and 122mm according t o t he diamet er of t he welding part s, and meets the test r equir ements. M 125 is countr ies need an inner t hread diameter. To sum up, sealing part s 1 size design for whic h sour ces ar e available, in line wit h t he mechanical design r equir ement s, but also f acilt at e t he m anufacturing process of t he part s, in line wit h t he economic, easy processing char act eristics, m at er ial select ion of Duralumin alloy. Finished af ter surf ace tr eat ment, debur ing, sur face r oughness r equir ed t o 12. 5. Rough tur ni g t o m eet the process r equir ements. Sealing diamet er of par ts 2 24mm e under welded weld diam et er . Tot al widt h 130m m can m eet t he nat ional st andar d in t he hexagon of hexagons f ixt ur e clam ping r equir em ent s. Seal par t s 32m m weld can m eet t he lengt h r equir em ent . Thickness 8m m t o t ight en and r em oving ar e f ixt ur es r equir ed t hickness t hickness of 10M M is obt ained in accor dance wit h hose, able t o m eet gas r equir em ent s. Seal par t 1 int er nal dimensions φ 106 according to the diam eter of the welding parts, and meets the test requirements. M125 is countries need an inner t hr ead diam et er . To sum up, sealed par t 2 of t he design f or which sour ces ar e available, in line wit h t he m echanical design r equir em ents, but also f acilt ate t he m anufact uring process of the par ts, in line wit h t he econom ic, easy processing characterist ics, m at er ial select ion of Duralumin alloy. Surf ace aft er pro Sealing should have enough pr eload, is a t wosided m andat ory sealing. Usualy in connect ion wit h a ball in one of the upper and or lower stem is equipped wit h t hrust bear ing. Float ing ball valve design should f ocus on sealing mat er ial can wit hstand t h