Hantle-ntle phapang ke efe lipakeng tsa litekanyetso tsa NPT, BSP le G?

'Pitfall' e hlokomolohuoang habonolo ha ho khethoa li-valve le li-fittings

Lipotsong tse ngata tsa bareki, hangata re kopana le maemo a kang ana:

"Ke hloka valve ea bolo e nang le likhoele tsa basali lintlheng tse peli."

"Ho lokile, u ka rata mokhoa ofe oa khoele?"

"Tsela e tloaelehileng feela - e tšoanang le ea pipe ea metsi."

Puisano ea mofuta ona e etsahala hoo e ka bang beke e 'ngoe le e 'ngoe. Ho khetha mokhoa o fosahetseng oa khoele ke e 'ngoe ea litaba tse atileng haholo ebile li theko e boima ho reka li-valve. Haeba valve e sa khone ho kenngoa ka mor'a ho reka, kapa haeba e kentsoe empa e hlōleha ho tiisa hantle, e lebisang ho lutla, liphello li tsoa ho tieho e nyenyane ho ea ho tlhokahalo ea ho tsosolosa tsamaiso eohle.

Kajeno, sengolong sena se sekhuts'oane, re tla hlakisa hang le bakeng sa litekanyetso tse tharo tse ferekaneng haholo: NPT, BSP le G.、、

I. A re qaleng ka phapang ea bohlokoa ka ho fetisisa: e 'ngoe ke 'khoune', e 'ngoe ke 'cylinder'.

Sena se theha motheo oa ho utloisisa liphapang tse ling kaofela.

Mofuta oa khoele

Mofuta oa khoele	Mabitso a felletseng	Lead angle	Sebopeho	Mokhoa oa ho tiisa
NPT	Khoele ea Pipe ea Naha ea Amerika e Tapered	60°	Khoele e tiisitsoeng (1:16 taper)	E tiisitsoe ka khoele ka boeona
BSPT (karolo ea letoto la BSP)	Khoele ea Borithane e Tapered ea Pipe	55°	Khoele e tiisitsoeng (1:16 taper)	E tiisitsoe ka khoele ka boeona
G (karolo ea letoto la BSP)	Khoele e Tloaelehileng ea Brithani ea Prismatic Pipe (BSPP)	55°	Khoele ea cylindrical (ha e na taper)	E tiisitsoe ka sefahleho sa ho qetela kapa gasket
BSP	British Standard Pipe Thread (ka kopanelo)	—	E kenyelletsa BSPT (tapered) le BSPP (cylindrical)	E itšetlehile ka mofuta o khethehileng

Ka bokhutšoanyane:

NPT = khoele e tapered e tloaelehileng ea Amerika

BSPT = Khoele e tapered e tloaelehileng ea Brithani

G khoele (BSPP) = Khoele e bapileng ea Brithani

Ka bobeli NPT le BSPT ke likhoele tse tapered tse nang le karo-karolelano e tšoanang ea taper (1:16), empa li fapana ka khoele ea khoele (NPT ke 60 °, athe BSPT ke 55 °).

II. Karohano e Felletseng: NPT, BSP le G ke Eng?

1. Likhoele tsa NPT (Maemo a Amerika)

Nomoro e Tloaelehileng: ASME B1.20.1

Litšobotsi: 60 ° khoele angle, 1:16 taper

Molao-motheo oa ho tiisa: Ho tiisa ho finyelloa ka ho kena-kenana le likhoele ka botsona; ha ho na gasket ea ho tiisa e hlokahalang

Libaka tse tloaelehileng: United States, Canada le linaha tse ling tse latelang tsamaiso ea maemo a Amerika

Litlhaloso tse tloaelehileng tsa valve ea bolo: 1/4‘NPT, 3/8’ NPT, 1/2” NPT

Tlhokomeliso: likhoele tsa NPT li hloka ts'ebeliso ea tepi ea PTFE kapa sealant ea khoele; taolo ea torque ke ea bohlokoa nakong ea kopano, kaha ho tiisa ho feta tekano ho ka etsa hore khoele ea basali e arohane.

2. likhoele tsa BSP (British Standard)

BSP ke lentsoe le akaretsang le akaretsang mefuta e 'meli, eo batho ba bangata ba atisang ho e ferekanya:

BSPT (Khoele e Tloaelehileng ea Pipe ea Brithani)	G thread / BSPP (British Standard Pipe Thread)
Nomoro e Tloaelehileng	BS 21	BS 2779 / ISO 228-1
Khoele Angle	55°	55°
Kaho	Khoele e tiisitsoeng (1:16 taper)	Khoele ea cylindrical (e sa tieang)
Mokhoa oa ho tiisa	Ho itiisa (ho hloka tepi ea Teflon)	E tiisitsoe ka tiiso ea sefahleho (mohlala, O-ring, washer e bataletseng, washer ea koporo)
Likopo tse Tloaelehileng	Linaha tsa Commonwealth, Europe le likarolo tsa Asia	E sebelisoa lefatšeng ka bophara, haholo-holo Europe le Asia
Mefuta e Tloaelehileng ea Valve ea Ball	1/4"BSPT,3/8"BSPT,1/2"BSPT	G1/4, G3/8, G1/2

Mona ke moo maikutlo a fosahetseng a leng teng: batho ba bangata ba nahana hore 'likhoele tsa BSP li tšoana le likhoele tsa G', empa sena ha sea nepahala ka botlalo. Likhoele tsa G ke mofuta oa BSP, empa BSP e boetse e kenyelletsa BSPT. Likhoele tsa G li cylindrical, ha likhoele tsa BSPT li tapelitsoe; melao-motheo ea ho tiisa ka morao ho tse peli e fapane ka ho feletseng, 'me ha ea lokela ho sebelisoa ka mokhoa o fapaneng.

III. Tafole e le 'ngoe ho utloisisa liphapang tsohle

Litekanyetso tsa Papiso	NPT	BSPT	G (BSPP)
Mokhoa o tloaelehileng	Tekanyetso ea Amerika	British Standard	British Standard (e tsebahalang lefatšeng ka bophara)
Profaele ea Leino	60°	55°	55°
Sebopeho	Khoele e taped	Khoele e taped	Khoele ea Cylindrical
Taper	1:16	1:16	Ha ho letho
Mokhoa oa ho tiisa	Tiiso ea khoele (e phuthetsoeng ka tepi ea Teflon)	Tiiso ea khoele (e nang le tepi ea Teflon)	Setiiso sa sefahleho (gasket/O-ring)
The'/ ka khoutu	mohlala 1/2" NPT	mohlala 1/2" BSPT	mohlala G1/2
Na lia fapanyetsanoa?	Ha e fetoloe le BSP	Ha e fetoloe le NPT	Ha e fetohe le BSPT

IV. U ka potlakela ho tseba phapang joang ts'ebetsong?

Haeba u na le sampole letsohong la hao ntle le lengolo, u ka e tseba ka tsela e latelang:

Mokhoa oa 1: Sheba boemo ba khoele (e hloka tekanyo ea khoele kapa tekolo ea khoele)

Boemo ba khoele ea 60° → NPT

Boemo ba khoele ea 55° → letoto la BSP (G kapa BSPT)

Mokhoa oa 2: Sheba sebopeho sa ho tiisa

Thrli-eads li hloka tepi ea Teflon kapa sealant → NPT kapa BSPT (likhoele tse tapered)

E hloka washer e bataletseng, O-ring kapa brass washer → G thread (cylindrical threads)

Mokhoa oa 3: Bala palo ea likhoele (mokhoa oa khakanyo ea kapele)

Bakeng sa saese e tšoanang ea lebitso, palo ea likhoele ka inch e fapana lipakeng tsa NPT le BSP. Ka mohlala, 1/2":

NPT: likhoele tse 14 ka inch

BSP (G/BSPT): likhoele tse 14 ka inch (boholo bona bo tšoana ka bobeli, bo etsa hore ho be bonolo ho bo ferekanya)

Leha ho le joalo, bakeng sa 3/4": NPT e na le likhoele tse 14 'me BSP e na le likhoele tse 14 (e ntse e tšoana)

Phapang ea 'nete e ka lehlakoreng la khoele le taper, tseo ho leng thata ho li lemoha ka mahlo; mokhoa o tšepahalang ka ho fetisisa ke oa ho sebelisa sekala sa khoele.

Mokhoa oa 4: Sheba naha ea tsoalo kapa litlhoko tsa bareki

Haeba moreki a le US mme litšoantšo li hlakisa ASME → NPT

Haeba moreki a le Europe kapa Commonwealth mme litšoantšo li hlakisa BS kapa ISO → BSP

Haeba litšoantšo li hlakisa 'G' e lateloa ke palo (mohlala, G1/2) → khoele ea cylindrical; ho hlokahala washer

V. Ho etsahala'ng haeba khetho e fosahetseng e etsoa? (Linyeoe tsa 'nete)

Taba ea 1: Moetsi ea itseng oa lisebelisoa o rekile sehlopha sa li-valve tsa bolo tse nang le likhoele tse ka hare tsa G1/2, empa likhoele tse kantle ho lipeipi tsa moreki e ne e le NPT 1/2. Mosebeletsi e mong o ile a leka ho phurufa valve ka likhoka ka makhetlo a mane empa a sitoa ho e phethola; ha ho sebelisoa matla a eketsehileng ka sepane, likhoele tsa sehlopha sa valve lia arohana, e leng ho etsang hore sehlopha sohle sa li-valve se se ke sa sebelisoa.

Taba ea 2: Laboratori e kentse valve ea bolo e nang le khoele ea ka ntle ea BSPT ho lumellana le khoele ea ka hare ea G. E ne e ikutloa e le ‘e nepahetseng’ ha e thijoa, empa teko ea khatello e ile ea senola ho lutla hanyenyane. Ho ile ha nka matsatsi a mararo ho etsa lipatlisiso ho fumana hore likhoele li ne li sa lumellane— khoele e tapered e ne e kentsoe khoeleng e ka hare ea cylindrical, e nang le likhoele tse ’maloa feela tsa pele tse kopanang, e leng se ileng sa fella ka hore ho se ke ha tiisoa sebaka se lekaneng.

Thuto: Ha ho tluoa tabeng ea likhoele tse sa lumellaneng, ha ho na ntho e kang 'haufi ka ho lekaneng'. Phapang ea 1 ° feela ka lehlakoreng la khoele ke phapang pakeng tsa ho se khone ho lumellana le karolo le ho sitoa ho fumana tiiso.

VI. Litlhahiso tsa ho Qetela tsa ho Reka Basebetsi le Baenjiniere

Pele o etsa odara, ka kopo etsa bonnete ba hore o netefalitse lintlha tse tharo tse latelang:

Tekanyetso ea likhoele (NPT kapa BSP/G?)

Mofuta oa khoele (e tapered kapa cylindrical?)

Boholo ba khoele (mohl. 1/4‘, 3/8’, 1/2")

Netefatsa hore boholo ba litšoantšo bo hlalositsoe ka nepo:

Tekanyetso ea US: ngola 1/2-14 NPT

Tekanyetso ea Brithani ea tapered: ngola 1/2 BSPT

Maemo a tšoanang a Borithane: ngola G1/2 kapa 1/2 BSPP

Ha u na bonnete ka lintlha tsa mohala oa hau oa mohala? Re mona ho u thusa ho li netefatsa.

Ho bapisa likhoele ke eona ntho ea bohlokoa ka ho fetisisa—ebile e tloaetseng liphoso—ea tsamaiso ea lipeipi. Phoso e le 'ngoe ea maemo a khoele e ka etsa hore sehlopha sohle sa li-valve se se ke sa sebelisoa, kapa sa baka ho lutla le tlhoko ea ho sebetsa bocha ho pholletsa le sistimi eohle ea liphaephe.

Haeba ho ka etsahala hore u be u na le lisampole tse kang li-valve tsa bolo, liphaephe tsa ho kenya kapa lihokelo, kapa haeba u na le foto ea khoele 'me u sa kholisehe ka maemo a teng, ka kopo ikutloe u lokolohile ho re romella tsona neng kapa neng, 'me re tla u tiisetsa tsona mahala.

Ha re etse ‘likhakanyo tse thata’; re fetisa litšupiso khahlano le maemo, 'me re nka litekanyo tsa 'nete re sebelisa litekanyo tsa likhoele ho u fa karabo e nepahetseng.

Mokhoa oa ho netefatsa:

Nka senepe se hlakileng sa sefahleho se kholetsoeng 'me u re romelle sona.

Ho bonolo le ho feta haeba u na le sampole ea 'mele, kaha re ka e lekanya ka kotloloho re sebelisa sekala sa khoele.

U ka ikopanya le rona ka WeChat, mohala kapa lengolo-tsoibila (lintlha tsa puisano): clvy@shenchihb.com

Re ka fana ka mefuta ea likhoele:

Li-valve tsa rona tsa bolo le lisebelisoa tsa liphaephe li ka etsoa ka mokhoa o ikhethileng ho fihlela maemo a fapaneng a likhoele, ho kenyeletsoa NPT, BSPT le G (BSPP), ho netefatsa hore ho bapana ka liperesente tse 100 le sistimi ea hau ea liphaephe. Ebang ke bakeng sa 'maraka oa lehae kapa bakeng sa kantle ho naha, re ka etsa litšoantšo tsa hau.

Khetha khoele e nepahetseng 'me u qobe mathata a sa hlokahaleng. Haeba o sa tiisehe, re tlohelle hore re u tiise.