Gate valve a nihi general-purpose valve hman tlanglawn tak a ni a, hmanna hrang hrang a nei bawk. Tui humhalhna, metallurgy leh industry dang dangah te hman a ni ber. A performance hrang hrang hi market-in a hrechiang hle. Gate valve zirchianna bakah hian a hman dan leh harsatna chinfel dan tur zirchianna uluk zawk leh uluk zawk a siam bawkgate valve te a awm bawk.
A hnuaia tarlan te hi a structure, use, troubleshooting, quality inspection leh a dangte chungchang sawihona tlangpui a nigate valve te a awm bawk.
1. Insiam dan (structure) a ni
A insiam dan tur chugate valve a ni: chumigate valve a nichu valve a ni a, gate plate leh valve seat hmanga hawn leh khar dan control thin a ni.Gate valve a nia bik takin valve body, valve seat, gate plate, valve stem, bonnet, stuffing box, packing gland, stem nut, handwheel leh a dangte a awm a ni. Gate leh valve seat inkar relative position inthlak dan azirin channel size pawh thlak danglam theih a ni a, channel pawh tihtawp theih a ni bawk. A siam theih nan chuangate valve a nikhar nghet la, gate plate leh valve seat mating surface chu ground a ni.
Structural shape hrang hrang a ziringate valve te a awm bawk, gate valve te hi wedge type leh parallel type ah then theih a ni.
A gate chu a wedge agate valve a nichu wedge ang mai a ni a, sealing surface chuan channel center line nen oblique angle a siam a, gate leh valve seat inkar wedge chu sealing (closing) neih nan hman a ni. Wedge plate hi ram pakhat emaw, ram pahnih emaw pawh a ni thei.
Parallel gate valve-a sealing surface te hi a inzawm tlat a, channel center line-ah a perpendicular a, chi hnih a awm a, expansion mechanism nei leh expansion mechanism nei lo. Double rams a awm a, spreading mechanism a nei bawk. Ram te an chhuk chuan parallel ram pahnih wedge te chuan valve seat-a ram pahnih chu inclined surface-ah an theh darh ang a, flow channel chu a block ang. Rams te an lo chhuah a, an inhawng chuan wedge leh gate te chu The matching surface of the plate chu a inthen a, gate plate chu a san zawng engemaw chen a sang a, wedge chu gate plate-a boss-in a thlawp a ni. Expansion mechanism nei lo double gate, gate chu parallel seat surface pahnih zawhin valve seat chhungah a tlan lut a, chu fluid pressure hmangin gate chu valve outlet lam a valve body-ah press a, fluid chu seal a ni.
Gate hawn leh khar huna valve stem inher dan azirin gate valve hi chi hnih ah then a ni a, chungte chu rising stem gate valve leh concealed stem gate valve te an ni. Rising stem gate valve-a valve stem leh gate plate chu hawn emaw khar emaw a nih chuan a rualin a sang leh a tla a; concealed stem gate valve hawn emaw khar emaw a nih chuan valve stem chauh a inher a, valve stem lift chu hmuh theih a ni lo va, valve plate chu a sang emaw a tla emaw sports a ni. Rising stem gate valve thatna chu channel hawnna san zawng hi valve stem san zawng atanga teh theih a ni a, mahse occupied height chu a tawi thei a ni. Handwheel emaw handle emaw lam hawi chuan handwheel emaw handle emaw chu darkar lam hawiin her la, valve khar rawh.
2. Gate valve-a hun hman dan leh thlan dan tur
01. Flat a nigate valve a ni
Slab gate valve hman hun chhung:
(1) Oil leh natural gas pipeline tan pawh diversion hole nei flat gate valve hi pipeline tihfai a awlsam hle.
(2) Oil thianghlim siamna tur pipeline leh dahna hmanrua.
(3) Oil leh natural gas siamna atana hmanraw hmanraw (exploitation port devices).
(4) Pipeline-ah chuan suspended particle media a awm.
(5) Khawpui chhunga gas thawn chhuahna pipeline.
(6) Tui hnathawhna.
Slab thlan dan tur principlegate valve a ni:
(1) Oil leh natural gas pipeline atan chuan single emaw double slab emaw hmang ang chegate valve te a awm bawk. Pipeline tihfai a ngai a nih chuan diversion hole open stem flat gate valve nei gate pakhat hmang ang che.
(2) Refined oil phurh chhuahna pipeline leh dahna hmanrua atan chuan flat gate valve, single ram emaw, double ram emaw nei, diversion hole nei lo thlan a ni.
(3) Oil leh natural gas lakchhuahna port installation atan chuan single gate emaw double gate slab gate valve, hidden rod floating seat leh diversion hole nei thlan a ni.
(4) Suspended particle media nei pipeline tan chuan knife ang chi slab gate valve thlan a ni.
(5) Khawpui chhunga gas transmission pipeline atan chuan single gate emaw double gate emaw soft-sealed rising rod flat gate valve hmang ang che.
(6) Tap tui project atan chuan single gate emaw double gate gate valve emaw, open rod nei, diversion hole nei lo thlan a ni.
02. Wedge gate valve a ni
Wedge gate valve hman dan tur: Valve chi hrang hrang zingah gate valve hi hman lar ber a ni. A tlangpuiin full opening emaw full closing emaw atan chauh a tha a, regulation leh throttling atan pawh hman theih a ni lo.
Wedge gate valve hi a tlangpuiin valve pawn lam dimension chungchangah khauh taka tih tur awm lohna hmunah hman a ni a, a hnathawh dan pawh a harsa hle. Entirnan, working medium temperature sang leh pressure sang tak chuan hun rei tak chhunga seal theih nan closing parts te a mamawh a, etc.
A tlangpuiin, service conditions emaw mamawh sealing performance rintlak, pressure sang, high pressure cut-off (pressure danglamna lian tak), low pressure cut-off (pressure danglamna tenau), noise hniam, cavitation leh vaporization, high temperature medium, low temperature (cryogenic), Wedge gate valve hman a tha. Power industry, petroleum smelting, petrochemical industry, offshore oil, water supply engineering leh khawpui sakna, chemical industry leh thil dang dangah bawlhhlawh sawngbawlna engineering te hi hman a ni nasa hle.
Selection principle: 1.1.
(1) Valve fluid characteristics atana thil tul. Gate valve hi hnathawhna hmuna flow resistance tlem, flow capacity chak tak, flow characteristic tha tak, leh sealing khauh tak mamawhna atan thlan a ni.
(2) Temperature sang leh pressure sang medium. Pressure sang steam, temperature sang leh oil pressure sang te ang chi te.
(3) Temperature hniam (cryogenic) medium. Liquid ammonia, liquid hydrogen, liquid oxygen leh media dangte ang chi te.
(4) Pressure hniam leh diameter lian. Tui hnathawh te, bawlhhlawh sawngbawl hna te.
(5) Installation hmun: Installation san zawng a tlem chuan concealed stem wedge gate valve thlang la; a san zawng tihkhawtlai a nih loh chuan exposed stem wedge gate valve chu thlang rawh.
(6) Wedge gate valve hi full opening emaw full closing emaw atan chauh hman theih a nih hunah chauh hman theih a ni a, adjustment leh throttling atan pawh hman theih a ni lo.
3. Thil dik lo awm fo leh enkawl dan
01. Thil dik lo leh a chhan tlangpuigate valve te a awm bawk
A hnuah chuangate valve a nihman a ni a, medium temperature, pressure, corrosion leh contact part hrang hrangte relative movement-in a nghawng avangin a hnuaia harsatnate hi a awm fo thin.
(1) Leakage: A chi hnih a awm a, chungte chu pawn lam atanga leakage leh internal leakage te an ni. Valve pawn lama leakage chu external leakage an ti a, external leakage hi stuffing box leh flange connection-ah hmuh tur a awm tlangpui.
Stuffing box a leak chhan: stuffing chi emaw quality emaw hian a mamawh a tlin lo; stuffing chu a upa tawh emaw, valve stem a chhe tawh emaw; packing gland chu a lo chhuak a; valve stem chunglam chu a hrual a.
Flange connection-a leakage awm chhan: Gasket material emaw size emaw hian a mamawh a tlin lo; flange sealing surface-a processing quality a tha lo hle a; connection bolt te chu a nghet lo hle a; pipeline configuration chu a dik lo a, connection-ah hian additional load tam lutuk a siam chhuak a ni.
Valve chhunga leakage awm chhan: Valve lax closure avanga leakage awm chu internal leakage a ni a, hei hi valve sealing surface emaw sealing ring lax root emaw tihchhiat vang a ni.
(1) Corrosion hi valve body, bonnet, valve stem leh flange sealing surface te corrosion a ni fo thin. Corrosion hi medium hnathawh vang a ni ber a, chubakah filler leh gasket atanga ion chhuah vang a ni bawk.
(2) Scratches: gate leh valve seat te chu contact pressure engemaw zat hnuaia an inthlunzawm a, a chunglam local roughening emaw peeling emaw a awm thin.
02. Enkawlna turgate valve a ni
(1) Valve pawn lam atanga leak awm siamthat
Packing compress dawnin gland bolt te chu balance tur a ni a, chu chuan gland a tilt loh nan leh compaction atan gap a awm tir tur a ni. Packing compress lai hian valve stem chu a inher tur a ni a, chu chuan valve stem vel a packing chu a inang tlang tur a ni a, pressure a tight lutuk loh nan, chutiang chuan valve stem rotation a nghawng lo ang a, packing-a wear a tipung ang a, service life pawh a ti tawi ang. Valve stem chunglam chu a hrual a, chu chuan medium chu a chhuah awlsam phah a ni. Valve stem chunglam a scratch awmte tihbo nan hman hmain process tur a ni.
Flange connection-a leakage awm tur chuan gasket a chhiat chuan thlak leh tur a ni; gasket-a thil siam tur chu dik lo taka thlan a nih chuan hmanna atana thil tul phuhruk thei tur thil thlan tur a ni flange sealing surface processing quality a tha lo a nih chuan lakchhuah leh siamthat a ngai a ni. Flange sealing surface chu a qualify hma loh chuan reprocess leh a ni.
Chu bakah, flange bolt te uluk taka tihkhauh te, pipeline configuration dik tak te, flange connection-a additional load tam lutuk pumpelh te hi flange connection-a leakage venna atan a tha vek a ni.
(2) Valve chhunga leakage siamthat
Internal leakage siamthatna chu sealing surface leh sealing ring loose root (sealing ring chu valve plate emaw seat-a press emaw threading emaw hmanga fix a nih chuan) tihchhiat a ni. Sealing surface chu valve body leh valve plate-ah direct-a process a nih chuan loose root leh leakage-ah harsatna a awm lo.
Sealing surface a chhiat nasat a, sealing surface chu sealing ring atanga siam a nih chuan ring hlui chu la chhuakin sealing ring thar siam tur a ni sealing surface chu valve body-ah direct-a process a nih chuan sealing surface chhia chu lakchhuah hmasak tur a ni. La chhuak la, chutah chuan sealing ring thar emaw, processed surface emaw chu sealing surface tharah grind rawh. Sealing surface-a scratches, bumps, crushes, dents leh defects dangte chu 0.05mm aia tlem a nih chuan grinding hmangin tihbo theih a ni.
Leakage hi sealing ring bul ah a awm thin. Sealing ring chu press hmanga fix a nih chuan tetrafluoroethylene tape emaw white thick paint emaw dah lavalve a niseat emaw, sealing ring ring groove hnuai lam emaw chu seat la, chutah chuan sealing ring chu press la, sealing ring zung chu a khat ang Sealing ring thread a nih chuan thread inkarah fluid a leak loh nan PTFE tape emaw white thick paint emaw dah tur a ni.
(3) Valve corrosion siamthat
Thil awmdan pangngaiah chuan valve body leh bonnet chu a inang tlangin a corroded a, valve stem erawh chu pitted a ni fo thung. Siamthat dawnin corrosion products te hi paih hmasak tur a ni. Pitting pits nei valve stem tan chuan a depression tihbo nan lathe-ah process tur a ni a, slow-release agent awmna filler hmang tur a ni a, a nih loh leh filler chu distilled water hmanga silfai tur a ni a, valve stem tana hlauhawm filler chu paih chhuak tur a ni. ion hnim hring (corrosive ions) te.
(4) Sealing surface-a scratch awmte siamthat
Valve hman lai hian sealing surface chu a hrual loh nan bei la, valve khar hunah torque a lian lutuk tur a ni lo. Sealing surface a hrual chuan grinding hmangin a chhuak thei.
4. Hmuhchhuahnagate valve a ni
Tuna market boruak leh user mamawhnaah chuan irongate valve te a awm bawkaccount lian tak a ni. Product quality inspector i nih angin product quality inspection i hriat chian bakah product ngei pawh i hriatthiam a ngai bawk.
01. Thir hmuhchhuahna bulpuigate valve a ni
Thirgate valve te a awm bawkram pum huap standard GB/T12232-2005 “Flanged irongate valve te a awm bawkgeneral valve te tan”.
02. Thir atanga thil siam enfiahnagate valve a ni
A bik takin: chhinchhiahna, bang thickness tlem ber, pressure test, shell test, etc. Chung zingah chuan bang thickness, pressure, leh shell test te hi enfiahna thil tul leh thil pawimawh tak tak te an ni. Thil tling lo a awm chuan direct-in thil tling lo anga ngaih theih a ni .
A tawi zawngin, product quality inspection hi product inspection pumpuiah hian a pawimawh ber a, a pawimawhna pawh a lang chiang hle. Front-line inspection staff kan nih angin kan quality kan tihchak reng a ngai a, product inspection lama hna tha tak thawk tur chauh ni lovin, Only by having an understanding of the inspected products can we do a better job of inspection.
Post hun chhung: Mar-31-2023
