BSPT Xov Qhia Cov Qauv, Qhov Loj, Thiab Daim Ntawv Thov

Taw qhia

Kev xaiv txoj cai BSPT xov cuam tshuam rau kev sib khi ua haujlwm, siab ncaj ncees, thiab kev sib raug zoo thoob plaws hydraulic, pneumatic, thiab cov kav dej dav dav. Phau ntawv qhia no piav qhia txog yuav ua li cas BSPT threads raug txhais, cov qauv twg tswj hwm lawv, thiab yuav ua li cas taper, profile, thiab cov cai tswj hwm muaj feem cuam tshuam tiag tiag - ntiaj teb haum. Koj tseem yuav pom tias qhov nominal ntau npaum li cas tau txheeb xyuas, qhov twg BSPT feem ntau siv, thiab seb yuav kuaj xyuas dab tsi thaum sib piv cov txiv neej thiab poj niam xov hauv cov qauv tshiab lossis kev saib xyuas haujlwm. Nrog rau lub hauv paus ntawd, cov lus qhia hauv qab no yuav yooj yim dua los txhais thiab siv kom raug.

 

Vim li cas BSPT xov xaiv tseem ceeb

Kev qhia txog hom xov zoo yog qhov tseem ceeb ntawm kev tsim vaj tsev nyob rau hauv cov kav dej thiab cov kav dej. British Standard Pipe Taper (BSPT) xov tseem yog txoj kev sib txuas tseem ceeb thoob ntiaj teb, tshwj xeeb tshaj yog nyob hauv Europe, Asia, thiab Oceania. Vim tias nws tsim cov tshuab foob los ntawm kev cuam tshuam xov, kev nkag siab txog nws qhov tseeb geometric tsis yog qhov tseem ceeb rau cov engineers tsim siab -siab hydraulic, pneumatic, thiab kua dej hloov network.

 

BSPT cov qauv thiab cov lus txhais

BSPT yog tswj hwm thoob ntiaj teb los ntawm ISO 7-1 tus qauv thiab keeb kwm los ntawm BS 21. Cov xov siv Whitworth profile, tus cwj pwm los ntawm 55-degree suav nrog lub kaum ntse ntse thiab sib npaug ntawm cov ncov thiab hav. Lub ntsiab lus ntawm kev sib txuas BSPT yog nws cov diametrical taper ntawm 1:16, uas sib npaug rau lub kaum sab xis ntawm 1 degree, 47 feeb, thiab 24 vib nas this ntsuas los ntawm qhov nruab nrab axis. Qhov taper no tso cai rau cov xov sab nraud los ua kom nruj rau hauv cov xov sab hauv, tsim kom muaj kev sib koom ua ke siab thaum cov flanks compress rau ib leeg thaum sib dhos.

 

Qhov ntau thiab tsawg, cov ntawv, thiab cov cai xaiv

Raws li ISO 7-1 nomenclature, sab nraud taper threads raug xaiv los ntawm tsab ntawv 'R' (los ntawm Fabkis 'gaz rayé'), thaum cov xov sab hauv yog cim 'Rc'. Internal parallel threads tsim los ua phooj ywg nrog 'R' xov yog cim 'Rp'. Ib qho kev xaiv tiav suav nrog qhov loj me, xws li R 1/2 lossis Rc 3/4. Lub suab, ntsuas hauv threads ib nti (TPI), txo qis raws li cov yeeb nkab nominal loj.

 

Nominal Loj (Inches)	Threads per Inch (TPI)	Pitch (mm)	Loj Loj (mm)
1/8	28	0.907	9.728
1/4 & 3/8	19	1.337	13.157 / 16.662
1/2 & 3/4	14	1.814	20.955 / 26.441
1 rau 6	11	2.309	33.249+

Kev txheeb xyuas cov npe no kom zoo tiv thaiv kev tsis sib haum xeeb ntawm cov kab sib dhos, kom ntseeg tau tias cov khoom sib txawv los ntawm cov tuam txhab thoob ntiaj teb sib koom ua ke seamlessly.

 

BSPT vs BSPP thiab NPT

Kev sib hloov cov qauv xov tsis sib xws yog ib qho ua rau mob plab, xau, thiab kev puas tsuaj loj hauv cov tshuab uas muaj zog. Thaum BSPT qhia qhov zoo sib xws nrog rau lwm qhov chaw muaj xov xwm zoo li BSPP (British Standard Pipe Parallel) thiab NPT (National Pipe Taper), qhov sib txawv ntawm qhov sib txawv ntawm lawv ua rau kev hloov pauv tsis yooj yim yam tsis muaj cov khoom siv tshwj xeeb.

 

Qhov tseem ceeb sib txawv ntawm cov qauv thiab haum

Qhov sib txawv tseem ceeb tshaj plaws ntawm BSPT thiab NPT yog nyob rau hauv xov lub kaum sab xis thiab hauv paus / crest geometry. NPT, txhais los ntawm ANSI B1.20.1, siv 60-degree suav nrog lub kaum sab xis nrog lub ncov tiaj tiaj thiab hav (Sellers profile), thaum BSPT tso siab rau ntawm 55-degree lub kaum ntse ntse nrog cov kab sib npaug thiab cov hauv paus hniav. Tsis tas li ntawd, lub suab sib txawv ntawm qhov loj dua; Piv txwv li, 1-nti NPT haum muaj 11.5 TPI, thaum 1-nti BSPT haum muaj 11 TPI. Kev sim ua phooj ywg NPT txiv neej rau hauv BSPT poj niam yuav ua rau muaj kev sib khi tom qab ob peb zaug, tsim kom muaj txoj hauv kev xau. Hloov pauv, BSPP (ISO 228-1) qhia 55-degree lub kaum sab xis thiab TPI ntawm BSPT tab sis nta xoom taper, txhais tau tias nws tsis tuaj yeem tsim lub foob ntawm xov cuam tshuam.

 

Sealing, installation, thiab tshuaj xyuas

Vim tias BSPT tso siab rau cov hlau-rau- hlau cuam tshuam raws cov xov flanks, nws pib tawm qhov kev tshem tawm me me ntawm cov hauv paus hniav thiab crests. Yog li ntawd, ib tug xov sealant-feem ntau polytetrafluoroethylene (PTFE) daim kab xev los yog ib tug anaerobic kua compound- yog nruj me ntsis yuav tsum tau mus cuag ib tug xau- dawb sib koom. Kev txhim kho cov kev coj ua zoo tshaj plaws hais kom siv cov sealant nyob rau hauv cov kev taw qhia ntawm cov xov kauv, tawm hauv thawj ob lub xov liab qab los tiv thaiv kev kis kab mob.

 

Kev tswj kom zoo thaum lub sij hawm tsim khoom thiab kev tshuaj ntsuam xyuas yog nyob ntawm cov qauv txwv ntsuas. Cov neeg sib koom ua ke siv lub nplhaib L1 thiab L2 thiab ntsaws cov ntsuas ntsuas los txheeb xyuas lub suab kab ntawm lub ntsuas dav hlau, kom ntseeg tau tias qhov kev sib tw deb tau poob rau hauv qhov pom zoo +/- 1 tig kam rau ua. Kev siv lub zog kom raug yog qhov tseem ceeb sib npaug, vim tias dhau - zawm tapered threads ua rau muaj kev ntxhov siab ntau dhau, muaj feem cuam tshuam nrog lub cev valve lossis manifolds.

 

Yuav ua li cas xaiv BSPT fittings

Kev qhia txog BSPT haum txuas ntxiv tshaj qhov sib txuam xov geometry; nws yuav tsum muaj kev ntsuam xyuas holistic ntawm qhov chaw ua haujlwm. Cov kws kho tsheb yuav tsum ua kom haum rau lub cev thiab cov khoom siv hlau nrog cov kev xav tau ntawm cov kua dej, cov xwm txheej nyob ib puag ncig, thiab tag nrho cov txheej txheem kev ua neej.

 

Khoom siv, plating, thiab media compatibility

Cov khoom xaiv dictates ob qho tib si chemical compatibility thiab corrosion kuj. Tus qauv pneumatic thiab qis-siab hydraulic tshuab nquag siv tooj dag lossis dawb-machining carbon steel. Txhawm rau tiv thaiv oxidation nyob rau hauv ib puag ncig kev lag luam hnyav, carbon steel fittings feem ntau yog kho nrog zinc-nickel electroplating, uas niaj hnub ua tiav 500 mus rau 1,000 xuab moos ntawm cov xeb liab nyob rau hauv ASTM B117 ntsev tshuaj tsuag.

Rau kev tawm tsam kev tawm tsam, kev siv sab nrauv, lossis ib puag ncig huv, austenitic stainless hlau zoo li 316 lossis 316L yog qhov yuav tsum tau ua. Thaum mating stainless hlau BSPT Cheebtsam, engineers yuav tsum suav rau qhov kev pheej hmoo siab ntawm xov galling (txias vuam) los ntawm kev qhia cov nyiaj -plated internal threads los yog siv tshwj xeeb los tiv thaiv- txeeb lubricants thaum sib dhos.

 

Kev xaiv cov txheej txheem rau siab thiab kub

Lub siab thiab kub tuav peev xwm ntawm BSPT kev twb kev txuas yog inversely proportional rau nws nominal loj thiab nruj me ntsis txwv los ntawm xaiv sealant. Ib qho hnyav -lub luag haujlwm 1/4-inch 316 stainless hlau BSPT haum tuaj yeem tswj tau qhov siab ntawm hydraulic siab mus txog 10,000 psi (689 bar). Txawm li cas los xij, raws li qhov chaw hla ntu nce, qhov ntsuas siab poob qis qis; 2-nti haum ntawm cov khoom siv tib yam yuav raug ntsuas rau qhov siab tshaj plaws ntawm 4,000 psi (275 bar).

Cov kev txwv kub tsis tshua tau hais los ntawm lub hauv paus hlau tab sis theej los ntawm cov khoom sib khi. Thaum liab qab stainless hlau tswj kev ncaj ncees los ntawm cryogenic kub ntawm -196℃txog 500 degree, txheem PTFE daim kab xev degrades sai tshaj 260 degree. Rau siab -kub chav los yog thermal kua siv, tshwj xeeb graphite-raws li pastes los yog high-temperature anaerobic sealants yuav tsum tau teev kom muaj kev ncaj ncees ntawm BSPT sib koom.

 

Ntsiab Cai

Cov lus xaus tseem ceeb tshaj plaws thiab qhov laj thawj rau BSPT

Cov kev qhia tshwj xeeb, kev ua raws cai, thiab kev pheej hmoo kuaj xyuas tsim nyog ua ntej koj cog lus

Cov kauj ruam tom ntej no thiab cov lus ceeb toom cov neeg nyeem tuaj yeem siv tam sim ntawd

 

Cov lus nug nquag

Dab tsi tus qauv txhais BSPT xov?

BSPT yog txhais los ntawm ISO 7-1 thiab keeb kwm los ntawm BS 21. Nws siv 55℃Whitworth profile nrog 1:16 taper rau kev sib zog-nruj threaded pob qij txha.

Kuv tuaj yeem qhia BSPT los ntawm NPT li cas?

Kos lub kaum sab xis thiab lub suab. BSPT muaj 55℃profile thiab sib txawv TPI los ntawm NPT's 60℃daim ntawv, yog li lawv khi sai thiab yuav tsum tsis txhob sib xyaw.

BSPT thiab BSPP fittings puas tuaj yeem siv ua ke?

Tsuas yog nyob rau hauv tshwj xeeb R rau Rp ua ke. BSPT yog tapered thiab seals ntawm xov cuam tshuam, thaum BSPP yog tib yam thiab feem ntau xav tau ib txoj kev sib khi.

Puas yog kev sib txuas BSPT xav tau xov sealant?

Yog lawm. Siv PTFE daim kab xev los yog anaerobic sealant, qhwv nrog cov xov kev taw qhia, thiab khaws thawj ob txoj xov dawb kom txo tau cov kab mob.

R, Rc, thiab Rp txhais li cas ntawm BSPT xov?

R yog cov xov xov sab nraud, Rc yog cov xov xov sab hauv, thiab Rp yog cov xov sib txuas sab hauv tsim los ua phooj ywg nrog R txiv neej xov.