Kodi pali kusiyana kotani pakati pa miyezo ya ulusi ya NPT, BSP ndi G?

Chosavuta kunyalanyaza 'zenje' posankha mavavu ndi zomangira

M'mafunso ambiri amakasitomala, nthawi zambiri timakumana ndi zinthu monga izi:

Ndikufuna valavu ya mpira yokhala ndi ulusi wachikazi mbali zonse ziwiri.

"Chabwino, mungafune ulusi wanji?"

"Ulusi wokhazikika - wofanana ndi paipi yamadzi."

Kukambitsirana kotereku kumachitika pafupifupi mlungu uliwonse. Kusankha ulusi wolakwika ndi chimodzi mwazinthu zofala komanso zokwera mtengo pakugula ma valve. Ngati valavu sangathe kuikidwa pambuyo pogula, kapena ngati itayikidwa koma imalephera kusindikiza bwino, zomwe zimapangitsa kuti ziwonongeke, zotsatira zake zimachokera ku kuchedwa kwazing'ono mpaka kufunikira kokonzanso dongosolo lonse.

Lero, m'nkhani yaifupi iyi, tifotokozerenso mfundo zitatu zomwe zimasokonekera kwambiri: NPT, BSP ndi G.,

I. Tiyeni tiyambe ndi kusiyana kwakukulu: imodzi ndi 'cone', ina 'silinda'.

Izi zimapanga maziko omvetsetsa kusiyana kwina konse.

Mtundu wa ulusi

Mtundu wa ulusi	Dzina lonse	Njira yotsogolera	Kapangidwe	Njira yosindikizira
Mtengo wa NPT	American National Tapered Pipe Thread	60°	Ulusi Wopendekera (1:16 taper)	Kusindikizidwa ndi ulusi womwewo
BSPT (gawo la mndandanda wa BSP)	British Standard Tapered Pipe Thread	55°	Ulusi Wopendekera (1:16 taper)	Kusindikizidwa ndi ulusi womwewo
G (gawo la mndandanda wa BSP)	British Standard Prismatic Pipe Thread (BSPP)	55°	Ulusi wa Cylindrical (palibe taper)	Kusindikizidwa ndi nkhope yomaliza kapena gasket
Mtengo wa BSP	British Standard Pipe Thread (pamodzi)	—	Zimaphatikizapo BSPT (tapered) ndi BSPP (cylindrical)	Zimatengera mtundu weniweni

Mwachidule:

NPT = ulusi wokhazikika waku America

BSPT = ulusi wokhazikika waku Britain

G ulusi (BSPP) = British standard parallel thread

Onse NPT ndi BSPT ndi ulusi tapered ndi taper chiŵerengero chomwecho (1:16), koma amasiyana ulusi ngodya (NPT ndi 60 °, pamene BSPT ndi 55 °).

II. Kufotokozera Mwatsatanetsatane: Kodi NPT, BSP ndi G Ndi Chiyani?

1. NPT Threads (American Standard)

Nambala Yokhazikika: ASME B1.20.1

Maonekedwe: 60 ° ulusi angle, 1:16 taper

Mfundo yosindikiza: Kusindikiza kumatheka chifukwa cha kusokoneza kwa ulusi womwe; palibe gasket yosindikiza yomwe imafunikira

Zigawo wamba: United States, Canada ndi mayiko ena kutsatira American standard system

Zodziwika bwino valavu ya mpira: 1/4'NPT, 3/8' NPT, 1/2" NPT

Zindikirani: Ulusi wa NPT umafunika kugwiritsa ntchito tepi ya PTFE kapena chosindikizira cha ulusi; Kuwongolera kwa torque ndikofunikira pakumanga, chifukwa kumangirira kwambiri kumatha kupangitsa kuti ulusi wachikazi ugawike.

2. Ulusi wa BSP (British Standard)

BSP ndi liwu lodziwika bwino lomwe limaphatikizapo mitundu iwiri, yomwe anthu ambiri amakonda kusokoneza:

BSPT (British Standard Pipe Thread)	G ulusi / BSPP (British Standard Pipe Thread)
Nambala Yokhazikika	BS 21	BS 2779 / ISO 228-1
Ulusi Angle	55°	55°
Zomangamanga	Ulusi Wopendekera (1:16 taper)	Ulusi wozungulira (wosadulidwa)
Njira Yosindikizira	Kudzisindikiza (kumafuna tepi ya Teflon)	Kusindikizidwa ndi chosindikizira kumaso (monga O-ring, wochapira wafulati, wochapira wamkuwa)
Common Applications	Mayiko a Commonwealth, Europe ndi madera ena aku Asia	Amagwiritsidwa ntchito padziko lonse lapansi, makamaka ku Europe ndi Asia
Kukula kwa Vavu Wamba Mpira	1/4"BSPT, 3/8"BSPT, 1/2"BSPT	G1/4, G3/8, G1/2

Apa ndi pomwe pali malingaliro olakwika: anthu ambiri amaganiza kuti 'ulusi wa BSP ndi wofanana ndi ulusi wa G', koma izi sizolondola. Ulusi wa G ndi mtundu wa BSP, koma BSP imaphatikizansopo BSPT. G ulusi ndi cylindrical, pamene BSPT ulusi ndi tapered; mfundo zosindikizira kumbuyo kwa ziwirizi ndizosiyana kotheratu, ndipo siziyenera kugwiritsidwa ntchito mosiyana.

III. Gome limodzi kuti mumvetsetse kusiyana konse

Zofananira Zofananira	Mtengo wa NPT	Mtengo wa BSPT	G (BSPP)
Standard System	American muyezo	British Standard	British Standard (yodziwika padziko lonse lapansi)
Dzino Mbiri	60°	55°	55°
Kapangidwe	Ulusi wodulidwa	Ulusi wodulidwa	Ulusi wa Cylindrical
Taper	1:16	1:16	Palibe
Njira Yosindikizira	Chisindikizo cha ulusi (chokutidwa ndi tepi ya Teflon)	Chisindikizo cha ulusi (ndi teflon tepi)	Kusindikiza kumaso (gasket/O-ring)
The'/ mu kodi	mwachitsanzo 1/2" NPT	mwachitsanzo 1/2" BSPT	mwachitsanzo G1/2
Kodi ndizosinthana?	Osasinthika ndi BSP	Osasinthika ndi NPT	Osasinthika ndi BSPT

IV. Kodi mungadziwe bwanji kusiyana muzochita?

Ngati muli ndi chitsanzo m'manja mwanu popanda chizindikiro, mukhoza kuchizindikira motere:

Njira 1: Onani mbiri ya ulusi (imafuna choyezera ulusi kapena choyezera ulusi)

60° mbiri ya ulusi → NPT

Mbiri ya ulusi wa 55° → mndandanda wa BSP (G kapena BSPT)

Njira 2: Yang'anani mawonekedwe osindikizira

Thrma eds amafunikira tepi ya Teflon kapena sealant → NPT kapena BSPT (zingwe zojambulidwa)

Pamafunika makina ochapira athyathyathya, O-ring kapena wochapira mkuwa → G ulusi (ulusi wozungulira)

Njira 3: Werengani kuchuluka kwa ulusi (njira yoyezera mwachangu)

Pa kukula kwadzina komweko, kuchuluka kwa ulusi pa inchi kumasiyana pakati pa NPT ndi BSP. Mwachitsanzo, 1/2":

NPT: 14 ulusi pa inchi

BSP (G/BSPT): 14 ulusi pa inchi (kukula uku ndi kofanana kwa onse awiri, kuwapangitsa kukhala kosavuta kusokoneza)

Komabe, pa 3/4": NPT ili ndi ulusi 14 ndipo BSP ili ndi ulusi 14 (ofananabe)

Kusiyanitsa koona kuli mu ngodya ya ulusi ndi taper, zomwe zimakhala zovuta kuzizindikira ndi maso; njira yodalirika kwambiri ndiyo kugwiritsa ntchito chingwe choyezera ulusi.

Njira 4: Yang'anani dziko lochokera kapena zomwe makasitomala amafuna

Ngati kasitomala ali ku US ndipo zojambulazo zimatchula ASME → NPT

Ngati kasitomala ali ku Europe kapena Commonwealth ndipo zojambulazo zimatchula BS kapena ISO → BSP

Ngati zojambulazo zimatchula 'G' yotsatiridwa ndi nambala (mwachitsanzo G1/2) → ulusi wozungulira; washer amafunika

V. Chimachitika ndi chiyani ngati chisankho cholakwika chapangidwa? (Zochitika zenizeni)

Mlandu 1: Wopanga zida zina adagula gulu la mavavu ampira okhala ndi ulusi wamkati wa G1/2, koma ulusi wakunja pamapaipi a kasitomala anali NPT 1/2. Wogwira ntchito anayesa kupotoza valavuyo mwamphamvu mokhotakhota kanayi koma sanathe kuitembenuzanso; Mukawonjezera mphamvu ndi sipikani, ulusi wa valavu umagawanika, zomwe zimapangitsa kuti gulu lonse la mavavu likhale losagwiritsidwa ntchito.

Mlandu wa 2: Laboratory inaika valavu ya mpira yokhala ndi ulusi wakunja wa BSPT kuti ugwirizane ndi ulusi wamkati wa G. Zinkamveka ngati 'zabwino' pamene ziwongoleredwa, koma kuyesa kukakamiza kunavumbula kutayikira pang'ono. Zinatenga masiku atatu kufufuza kuti tipeze kuti ulusiwo unali wosagwirizana—ulusi wokhotakhota unali wokulungidwa mu ulusi wozungulira wa mkati, ndi ulusi woyambirira wokha umene unalumikizana, zomwe zinachititsa kuti pakhale malo osakwanira osindikiza.

Phunziro: Zikafika pakusagwirizana kwa ulusi, palibe chinthu ngati 'kuyandikira mokwanira'. Kusiyana kwa 1 ° kokha mu ngodya ya ulusi ndiko kusiyana pakati pa kulephera kukwanira chigawocho ndi kulephera kukwaniritsa chisindikizo.

VI. Malangizo Omaliza Ogula Ogwira Ntchito ndi Opanga

Musanayitanitsa, chonde onetsetsani kuti mwatsimikizira izi:

Ulusi wokhazikika (NPT kapena BSP/G?)

Mtundu wa ulusi (tapered kapena cylindrical?)

Kukula kwa ulusi (monga 1/4', 3/8', 1/2")

Onetsetsani kuti miyeso pazojambula yatchulidwa molondola:

Muyezo waku US: lembani 1/2-14 NPT

Muyezo waku Britain: lembani 1/2 BSPT

Muyezo wofananira waku Britain: lembani G1/2 kapena 1/2 BSPP

Simukutsimikiza za ulusi wa chitoliro chanu? Tabwera kukuthandizani kuwatsimikizira.

Kufananiza ulusi ndiye gawo lofunikira kwambiri - komanso losavuta kulakwitsa - mbali ya dongosolo la mapaipi. Kulakwitsa kumodzi muyeso ya ulusi kungapangitse kuti gulu lonse la mavavu likhale losagwiritsidwa ntchito, kapena kubweretsa kutayikira komanso kufunikira kokonzanso dongosolo lonse la mapaipi.

Ngati muli ndi zitsanzo monga mavavu a mpira, zolumikizira mapaipi kapena zolumikizira, kapena ngati muli ndi chithunzi cha ulusi ndipo simukutsimikiza za muyezo wake—chonde khalani omasuka kutitumizira nthawi iliyonse, ndipo tidzakutsimikizirani kwaulere.

Sitipanga ‘mapeto amwano’; timalozerana motsutsana ndi miyezo ndikuyesa zenizeni pogwiritsa ntchito zida zoyezera ulusi kuti tikupatseni yankho lolondola.

Momwe mungatsimikizire:

Tengani chithunzi chowoneka bwino cha ulusi wamapeto ndikutumiza kwa ife.

Ndizosavuta kwambiri ngati muli ndi zitsanzo zakuthupi, chifukwa titha kuziyeza mwachindunji pogwiritsa ntchito ulusi woyezera.

Mutha kulumikizana nafe kudzera pa WeChat, telefoni kapena imelo (zambiri): clvy@shenchihb.com

Mitundu ya ulusi yomwe titha kupereka:

Mavavu athu a mpira ndi zopangira zitoliro zitha kusinthidwa kuti zigwirizane ndi ulusi wosiyanasiyana, kuphatikiza NPT, BSPT ndi G (BSPP), kuwonetsetsa kuti machesi a 100 peresenti ndi makina anu opangira mapaipi. Kaya ndi msika wapakhomo kapena wogulitsa kunja, tikhoza kupanga zojambula zanu.

Sankhani ulusi woyenera ndikupewa zovuta zosafunikira. Ngati simukutsimikiza, tisiyeni kuti titsimikizire.