Uyini ngempela umehluko phakathi kwezindinganiso zentambo ye-NPT, BSP kanye ne-G?

'I-pitfall' enganakwa kalula ekukhetheni ama-valve nokufakwa

Emibuzweni eminingi yamakhasimende, sivame ukuhlangana nezimo ezinjengalezi:

"Ngidinga i-valve yebhola enezintambo zabesifazane emikhawulweni yomibili."

“Kunjalo, iyiphi indinganiso yochungechunge ongayithanda?”

“Intambo evamile nje—okufana nakumapayipi amanzi.”

Lolu hlobo lwengxoxo lwenzeka cishe masonto onke. Ukukhetha indinganiso yochungechunge olungalungile kungenye yezinkinga ezivame kakhulu futhi ezibiza kakhulu ekuthengeni ama-valve. Uma i-valve ingakwazi ukufakwa ngemva kokuthenga, noma uma ifakwe kodwa yehluleka ukuvaleka kahle, okuholela ekuvuzeni, imiphumela isukela ekubambezelekeni okuncane kuya esidingweni sokusebenza kabusha lonke uhlelo.

Namuhla, kulesi sihloko esifushane, sizocacisa kanye kuphela izindinganiso ezintathu ezivame ukudideka kakhulu: i-NPT, BSP kanye ne-G.、、

I. Ake siqale ngomehluko obaluleke kakhulu: enye 'i-cone', enye 'i-cylinder'.

Lokhu kwakha isisekelo sokuqonda wonke omunye umehluko.

Uhlobo lochungechunge

Uhlobo lochungechunge	Igama eligcwele	I-engeli yokuhola	Isakhiwo	Indlela yokufaka uphawu
I-NPT	Intambo Yepayipi Lepayipi Lezwe LaseMelika laseMelika	60°	Intambo ecijile (1:16 taper)	Ivalwe yintambo ngokwayo
I-BSPT (ingxenye yochungechunge lwe-BSP)	Intambo Yepayipi ElineTapered YaseBrithani	55°	Intambo ecijile (1:16 taper)	Ivalwe yintambo ngokwayo
G (ingxenye yochungechunge lwe-BSP)	Intambo Yepayipi Yase-British Standard Prismatic (BSPP)	55°	Intambo eyi-cylindrical (ayikho i-taper)	Ivalwe ngobuso bokuphela noma i-gasket
I-BSP	I-British Standard Pipe Thread (ngokuhlangene)	—	Kufaka i-BSPT (i-tapered) ne-BSPP (cylindrical)	Kuncike ohlotsheni oluthile

Kafushane:

I-NPT = Intambo ye-tapered ejwayelekile yaseMelika

I-BSPT = Intambo ye-tapered evamile yaseBrithani

Intambo ye-G (BSPP) = Intambo ehambisanayo yaseBritish

Kokubili i-NPT ne-BSPT kuyizintambo ezicijile ezinesilinganiso esifanayo se-taper (1:16), kodwa ziyehluka nge-engeli yentambo (i-NPT ingu-60°, kuyilapho i-BSPT ingu-55°).

II. Ukuhlukaniswa Okuningiliziwe: Iyini i-NPT, i-BSP ne-G?

1. Imicu ye-NPT (American Standard)

Inombolo Ejwayelekile: ASME B1.20.1

Izici: 60° i-engeli yochungechunge, 1:16 taper

Umgomo wokuvala: Ukuvalwa kufinyelelwa ngokuhlangana kokuphazamiseka kwezintambo ngokwazo; akukho gasket yokuvala edingekayo

Izifunda ezijwayelekile: I-United States, iCanada namanye amazwe alandela uhlelo olujwayelekile lwaseMelika

Ukucaciswa kwe-valve yebhola evamile: 1/4‘NPT, 3/8’ NPT, 1/2” NPT

Qaphela: Imicu ye-NPT idinga ukusetshenziswa kwe-PTFE tape noma i-thread sealant; Ukulawula i-torque kubalulekile ngesikhathi sokuhlanganisa, njengoba ukuqinisa ngokweqile kungabangela ukuhlukana kwentambo yesifazane.

2. Imicu ye-BSP (British Standard)

I-BSP yigama elijwayelekile elihlanganisa izinhlobo ezimbili, abantu abaningi abavame ukuzidida:

I-BSPT (British Standard Pipe Thread)	Uchungechunge lwe-G / BSPP (Uchungechunge lwepayipi elivamile laseBrithani)
Inombolo Ejwayelekile	BS 21	I-BS 2779 / ISO 228-1
I-Engeli yochungechunge	55°	55°
Ukwakha	Intambo ecijile (1:16 taper)	Intambo eyi-cylindrical (engagxilile)
Indlela Yokufaka uphawu	Ukuzivala (kudinga itheyiphu yeTeflon)	Ivalwe ngophawu lobuso (isb. I-O-ring, iwasha eliyisicaba, iwasha yethusi)
Izicelo Ezivamile	Amazwe e-Commonwealth, i-Europe kanye nezingxenye ze-Asia	Isetshenziswa emhlabeni wonke, ikakhulukazi eYurophu nase-Asia
I-Common Ball Valve Sizes	1/4"BSPT,3/8"BSPT,1/2"BSPT	G1/4, G3/8, G1/2

Yilapho kulele khona umbono oyiphutha omkhulu: abantu abaningi bacabanga ukuthi 'imicu ye-BSP iyafana ne-G', kodwa lokhu akulungile ngokuphelele. Imicu ye-G iwuhlobo lwe-BSP, kodwa i-BSP iphinda ihlanganise ne-BSPT. Imicu ye-G iyisilinda, kuyilapho imicu ye-BSPT icishiwe; izimiso zokubeka uphawu ngemuva kokubili zihluke ngokuphelele, futhi akufanele zisetshenziswe ngokushintshana.

III. Ithebula elilodwa lokuqonda wonke umehluko

Imibandela yokuqhathanisa	I-NPT	I-BSPT	I-G (BSPP)
Isistimu Ejwayelekile	Izinga laseMelika	I-British Standard	I-British Standard (eyaziwa emhlabeni jikelele)
Iphrofayili yezinyo	60°	55°	55°
Isakhiwo	Intambo eqoshiwe	Intambo eqoshiwe	Intambo ye-cylindrical
I-Taper	1:16	1:16	Lutho
Indlela Yokufaka uphawu	I-thread seal (egoqwe nge-Teflon tape)	I-Thread seal (nge-Teflon tape)	Uphawu lobuso (gasket/O-ring)
I'/ kukhodi	isib. 1/2" NPT	isib. 1/2" BSPT	isib. G1/2
Ingabe ziyashintsheka?	Ayishintsheki ne-BSP	Ayishintsheki ne-NPT	Ayishintsheki ne-BSPT

IV. Ungawubona kanjani ngokushesha umehluko ekusebenzeni?

Uma unesampula esandleni sakho elingenayo ilebula, ungalihlonza ngale ndlela elandelayo:

Indlela 1: Hlola iphrofayili yochungechunge (idinga igeji yentambo noma isihloli sentambo)

60° iphrofayela yochungechunge → NPT

55° iphrofayela yochungechunge → uchungechunge lwe-BSP (G noma BSPT)

Indlela yesi-2: Hlola isakhiwo sokuvala

Thrama-eads adinga itheyiphu ye-Teflon noma isivalo → i-NPT noma i-BSPT (imicu ecijile)

Idinga iwasha eyisicaba, i-O-ring noma iwasha yethusi → intambo ye-G (imicu eyisilinda)

Indlela yesi-3: Bala inani lemicu (indlela yokulinganisa ngokushesha)

Ngosayizi ofanayo wegama, inani lemicu ngeyintshi ngalinye liyahluka phakathi kwe-NPT ne-BSP. Isibonelo, 1/2":

I-NPT: Imicu eyi-14 iyintshi ngayinye

I-BSP (G/BSPT): Imicu engu-14 iyintshi ngayinye (lo sayizi uyafana kukho kokubili, okwenza kube lula ukukudida)

Nokho, ku-3/4": I-NPT inezintambo ezingu-14 futhi i-BSP inezintambo ezingu-14 (zisafana)

Umehluko wangempela utholakala ku-angle yentambo kanye ne-taper, okunzima ukuyibona ngeso lenyama; indlela ethembeke kakhulu ukusebenzisa i-thread gauge.

Indlela yesi-4: Hlola izwe lendabuko noma izidingo zekhasimende

Uma ikhasimende lizinze e-US futhi imidwebo icacisa i-ASME → NPT

Uma ikhasimende lizinze e-Europe noma ku-Commonwealth futhi imidwebo icacisa i-BS noma i-ISO → BSP

Uma imidwebo icacisa ‘G’ elandelwa inombolo (isb. G1/2) → intambo yesilinda; iwasha iyadingeka

V. Kwenzekani uma kwenziwa ukukhetha okungalungile? (Izimo zangempela)

Ikesi 1: Umkhiqizi wesisetshenziswa esithile uthenge inqwaba yamavalvu ebhola anemicu yangaphakathi ye-G1/2, kodwa imicu yangaphandle kumapayipi ekhasimende bekuyi-NPT 1/2. Isisebenzi sizame ukujiya i-valve ngenkani izikhathi ezine kodwa asikwazanga ukuqhubeka siyivula; lapho usebenzisa amandla engeziwe ngesipanela, izintambo zomzimba ze-valve ziyahlukana, okwenza lonke iqoqo lama-valve lingasebenzi.

Ikesi 2: Ilabhorethri ifake i-valve yebhola ngentambo yangaphandle ye-BSPT ukuze ilingane nentambo yangaphakathi ye-G. Izwakale ‘ingathi ilungile’ lapho ivuliwe, kodwa ukuhlolwa kokucindezela kwembula ukuvuza okuncane. Kwathatha izinsuku ezintathu zophenyo ukuze kutholwe ukuthi le micu yayingahambelani—ucu olucijile lwaluboshwe lwaba intambo yangaphakathi eyicylindrical, ngemicu yokuqala embalwa kuphela eyayithintana, okwaphumela ekubeni indawo evalekile inganele.

Isifundo: Uma kukhulunywa ngokungahambisani kahle kwentambo, ayikho into ethi 'vala ngokwanele'. Umehluko ka-1° nje ku-engeli yochungechunge umehluko phakathi kokungakwazi ukulingana nengxenye kanye nokungakwazi ukuthola uphawu.

VI. Izincomo Zokugcina Zokuthenga Abasebenzi Nonjiniyela

Ngaphambi kokufaka i-oda, sicela uqinisekise ukuthi uyiqinisekisile imininingwane emithathu elandelayo:

Uchungechunge olujwayelekile (NPT noma i-BSP/G?)

Uhlobo lwentambo (i-tapered noma i-cylindrical?)

Usayizi womucu (isb. 1/4‘, 3/8’, 1/2")

Qinisekisa ukuthi ubukhulu bemidwebo bucaciswe ngendlela efanele:

Izinga lase-US: bhala 1/2-14 NPT

Izinga le-tapered laseBrithani: bhala i-1/2 BSPT

Izinga elihambisanayo laseBrithani: bhala i-G1/2 noma 1/2 BSPP

Awuqinisekile mayelana nokucaciswa kochungechunge lwakho lwepayipi? Sikhona ukukusiza ukuthi uziqinisekise.

Ukumatanisa uchungechunge kuyisici esibaluleke kakhulu—futhi esivame kakhulu emaphutheni—sohlelo lwamapayipi. Iphutha elilodwa esilinganisweni sentambo lingase libangele ukuthi iqoqo lonke lamavalvu lingasebenziseki, noma liholele ekuvuzeni kanye nesidingo sokusebenza kabusha kulo lonke uhlelo lwamapayipi.

Uma kwenzeka unamasampula afana namavalvu ebhola, okokufakwa kwamapayipi noma izixhumi, noma uma unesithombe sochungechunge futhi ungaqiniseki ngezinga elijwayelekile—sicela ukhululeke ukusithumela noma nini, futhi sizokuqinisekisa mahhala.

Asenzi ‘izilinganiso ezinzima’; siqhathanisa nezindinganiso futhi sithatha izilinganiso zangempela sisebenzisa ama-thread gauge ukuze sikunikeze impendulo enembile.

Ungaqinisekisa kanjani:

Thatha isithombe esicacile sobuso obufakwe imicu bese usithumela kithi.

Kulula nakakhulu uma unesampula ebonakalayo, njengoba singakwazi ukuyikala ngokuqondile sisebenzisa igeji yochungechunge.

Ungasithinta nge-WeChat, ngocingo noma nge-imeyili (imininingwane yokuxhumana): clvy@shenchihb.com

Izinhlobo zochungechunge esingazihlinzeka:

Amavalvu ethu ebhola nokufakwa kwamapayipi kungenziwa ngendlela oyifisayo ukuze kuhlangatshezwane namazinga ahlukahlukene entambo, okuhlanganisa i-NPT, BSPT kanye ne-G (BSPP), ukuqinisekisa ukufana kwamaphesenti angu-100 nohlelo lwakho lwamapayipi. Kungakhathaliseki ukuthi okwemakethe yasekhaya noma ukuthekelisa, singakwazi ukwenza imidwebo yakho.

Khetha intambo efanele futhi ugweme izinkinga ezingadingekile. Uma ungaqiniseki, kushiye kithi ukuze sikuqinisekise.