Ndeupi chaizvo musiyano uripo pakati peNPT, BSP uye G tambo zviyero?

Iyo inonyanya kufuratirwa 'pitfall' mukusarudza mavharuvhu uye mafittings

Mumibvunzo yakawanda yevatengi, tinowanzosangana nemamiriro ezvinhu akadai:

"Ndinoda vharafu ine tambo dzechikadzi kumativi ose."

"Zvakanaka, ndeipi tambo standard yaungade?"

"Ingori shinda yakajairwa - yakafanana neyepapombi yemvura."

Kukurukurirana kwakadai kunoitika vhiki rega rega. Kusarudza iyo isiriyo tambo mwero ndeimwe yezvinhu zvinowanzoitika uye zvinodhura mukutenga mavharuvhu. Kana iyo valve isingakwanisi kuiswa mushure mekutenga, kana kana yakasungirirwa asi ikakundikana kuvhara zvakanaka, zvichiita kuti ivhuvhute, migumisiro inobva pakunonoka kuduku kusvika pakudiwa kwekugadzirisa zvakare hurongwa hwose.

Nhasi, muchinyorwa chipfupi ichi, tichajekesa kamwe chete uye kune ese matatu anowanzo kuvhiringika tambo zviyero: NPT, BSP uye G.,,

I. Ngatitangei nemusiyano wakanyanya kukosha: imwe i'cone', imwe 'cylinder'.

Izvi zvinoumba hwaro hwekunzwisisa mimwe misiyano yese.

Thread type

Thread type	Zita rizere	Lead angle	Chimiro	Kuvhara nzira
NPT	American National Tapered Pipe Thread	60°	Taped thread (1:16 taper)	Yakanamwa neshinda pachayo
BSPT (chikamu cheBSP yakatevedzana)	British Standard Tapered Pipe Thread	55°	Taped thread (1:16 taper)	Yakanamwa neshinda pachayo
G (chikamu cheBSP series)	British Standard Prismatic Pipe Thread (BSPP)	55°	Cylindrical thread (hapana taper)	Yakavharwa nekuguma kwechiso kana gasket
BSP	British Standard Pipe Thread (pamwe chete)	—	Inosanganisira BSPT (tapered) uye BSPP (cylindrical)	Zvinoenderana nemhando chaiyo

Muchidimbu:

NPT = American standard tapered thread

BSPT = British standard tapered thread

G shinda (BSPP) = British standard parallel thread

Zvose NPT neBSPT ishinda dzakatapirwa dzine taper ratio (1:16), asi dzinosiyana pamakona eshinda (NPT iri 60°, ukuwo BSPT iri 55°).

II. Tsanangudzo Yakadzama: Chii chinonzi NPT, BSP uye G?

1. NPT Threads (American Standard)

Nhamba Yenguva: ASME B1.20.1

Hunhu: 60° thread angle, 1:16 taper

Chisimbiso musimboti: Kuisa chisimbiso kunowanikwa kuburikidza nekukanganiswa kuenderana kweshinda pachadzo; hapana kuvhara gasket kunodiwa

Nzvimbo dzakajairwa: United States, Canada nedzimwe nyika dzinotevera American standard system

Zvakajairwa bhora vharafu zvirevo: 1/4'NPT, 3/8' NPT, 1/2" NPT

Cherechedza: NPT tambo dzinoda kushandiswa kwePTFE tepi kana tambo sealant; torque control yakakosha panguva yekuungana, sezvo kuomesa zvakanyanya kunogona kukonzera kuti tambo yechikadzi iparadzane.

2. BSP threads (British Standard)

BSP ishoko rinowanzobatanidza marudzi maviri, ayo vanhu vazhinji vanowanzovhiringidza:

BSPT (British Standard Pipe Thread)	G thread / BSPP (British Standard Pipe Thread)
Standard Number	BS 21	BS 2779 / ISO 228-1
Thread angle	55°	55°
Kuvaka	Taped thread (1:16 taper)	Cylindrical thread (isina-tapered)
Kuisa Chisimbiso	Kuzvisimbisa (inoda Teflon tepi)	Yakanamwa nechisimbiso chechiso (e.g. O-ring, flat washer, brass washer)
Common Applications	Nyika dzeCommonwealth, Europe uye zvikamu zveAsia	Inoshandiswa munyika yose, kunyanya muEurope neAsia
Common Ball Valve Sizes	1/4"BSPT, 3/8"BSPT, 1/2"BSPT	G1/4, G3/8, G1/2

Apa ndipo panowanikwa fungidziro huru: vanhu vazhinji vanofungidzira kuti 'tambo dzeBSP dzakafanana netambo dzeG', asi izvi hazvina kunyatso. G shinda imhando yeBSP, asi BSP inosanganisirawo BSPT. Shinda dzeG dzine cylindrical, ukuwo tambo dzeBSPT dzichidhindwa; misimboti yekuisa chisimbiso kumashure kwezviviri zvakasiyana zvachose, uye haifanirwe kushandiswa zvakasiyana.

III. Tafura imwe chete yekunzwisisa misiyano yese

Kuenzanisa Criteria	NPT	BSPT	G (BSPP)
Standard System	American standard	British Standard	British Standard (inozivikanwa pasi rose)
Zino Profile	60°	55°	55°
Chimiro	Tapered thread	Tapered thread	Cylindrical thread
Taper	1:16	1:16	Hapana
Kuisa Chisimbiso	Thread chisimbiso (yakaputirwa neTeflon tepi)	Thread chisimbiso (ine Teflon tepi)	Chisimbiso chechiso (gasket / O-ring)
Iyo'/ mune kodhi	e.g. 1/2" NPT	e.g. 1/2" BSPT	e.g. G1/2
Anogona kuchinjana here?	Haisi kuchinjaniswa neBSP	Hazvichinjike neNPT	Haisi kuchinjaniswa neBSPT

IV. Iwe unogona sei kukurumidza kuona mutsauko mukuita?

Kana uine sampuli muruoko rwako isina label, unogona kuiona sezvizvi:

Method 1: Tarisa chimiro chetambo (inoda tambo yegeji kana tambo tester)

60° thread profile → NPT

55° thread profile → BSP series (G kana BSPT)

Nzira 2: Tarisa chimiro chekuisa chisimbiso

Threads inoda Teflon tepi kana sealant → NPT kana BSPT (tambo dzakatepwa)

Inoda washer yakati sandara, O-ring kana washer yebhurasi → G shinda (cylindrical threads)

Method 3: Verenga nhamba yeshinda (yekukurumidza kufungidzira nzira)

Pakukura kwezita rimwe chete, nhamba yeshinda pa inch inosiyana pakati peNPT neBSP. Somuenzaniso, 1/2":

NPT: 14 shinda pa inch

BSP (G/BSPT): 14 shinda pa inch (saizi iyi yakafanana kune ese ari maviri, zvichiita kuti zvive nyore kuvhiringa)

Zvakadaro, ye3/4": NPT ine shinda gumi neina uye BSP ine gumi nena shinda (zvichiri zvakafanana)

Musiyano wechokwadi uri mukona yeshinda uye taper, izvo zvakaoma kuona nemaziso; nzira inovimbika ndeye kushandisa tambo yegeji.

Nzira 4: Tarisa nyika yekwakabva kana zvinodiwa nevatengi

Kana mutengi ari muUS uye madhirowa anotsanangura ASME → NPT

Kana mutengi ari muEurope kana Commonwealth uye madhirowa anotsanangura BS kana ISO → BSP

Kana mifananidzo ichitsanangura 'G' ichiteverwa nenhamba (e.g. G1/2) → cylindrical thread; washer inodiwa

V. Chii chinoitika kana sarudzo isiriyo ikaitwa? (Makesi chaiwo)

Case 1: Mumwe mugadziri wemidziyo akatenga batch yebhora mavharuvhu ane G1/2 shinda dzemukati, asi tambo dzekunze papombi yemutengi dzaive NPT 1/2. Mushandi akaedza kumonya vharuvhu nesimba kwemakona mana asi haana kukwanisa kuenderera mberi; pakuisa rimwe simba nechipanha, tambo dzemuviri wevharuvhu dzinotsemuka, zvichiita kuti batch rese remavharuvhu rirege kushandiswa.

Case 2: Rabhoritari yakaisa vharafu yebhora ine BSPT shinda yekunze kune inokwana ine G yemukati shinda. Yainzwa 'zvekurudyi' payakadzvanywa, asi bvunzo yekumanikidza yakaratidza kudonha kudiki. Zvakatora mazuva matatu ekuferefeta kuona kuti shinda idzi dzaisapindirana — shinda ine tapered yakanga yamoneredzwa mucylindrical shinda yemukati, netambo shoma dzekutanga chete dzaibatana, zvichikonzera kusakwana kwekuvharika.

Chidzidzo: Kana zvasvika pakusawirirana kweshinda, hapana chinhu chakadai sekuti 'pedyo zvakakwana'. Musiyano we1 ° chete mukona yeshinda mutsauko uripo pakati pekutadza kukwana chikamu uye kusakwanisa kuwana chisimbiso.

VI. Mazano ekupedzisira eKutenga Vashandi uye Mainjiniya

Usati waisa odha, ndapota ita shuwa kuti wasimbisa zvinotevera zvinhu zvitatu:

Thread standard (NPT kana BSP/G?)

Thread type (tapered kana cylindrical?)

Saizi yeshinda (e.g. 1/4', 3/8', 1/2")

Ita shuwa kuti zviyero pazvidhori zvinotsanangurwa nenzira kwayo:

US mwero: nyora 1/2-14 NPT

British tapered standard: nyora 1/2 BSPT

British parallel standard: nyora G1/2 kana 1/2 BSPP

Hauna chokwadi nezve mataurirwo ako epombi thread? Isu tiripo kukubatsira kuti uzvionese.

Kufananidza tambo ndiyo inonyanya kukosha-uye inonyanya kukanganisa kukanganisa-chikamu chepipework system. Kukanganisa kumwe chete muyero yeshinda kunogona kuita kuti batch rese remavharuvhu risagoneke, kana kutotungamira mukudonha uye kudiwa kwekugadzirisa papipework system yese.

Kana iwe uine samples dzakaita semavharuvhu ebhora, pombi dzekuisa kana zvinobatanidza, kana uine mufananidzo weshinda uye usina chokwadi nechiyero - ndapota inzwa wakasununguka kutitumira kwatiri chero nguva, uye tichakuonesa iwe mahara.

Hatiiti ‘zvakaoma kufungidzira’; isu tinoyambuka-reference tichipesana nezviyero uye tinotora zviyero chaizvo tichishandisa shinda geji kuti tikupe iwe mhinduro chaiyo.

Nzira yekusimbisa sei:

Tora mufananidzo wakajeka wechiso chine shinda uye utumire kwatiri.

Izvo zvakatonyanya nyore kana uine sampuli yemuviri, sezvo isu tichigona kuiyera zvakananga tichishandisa shinda yegeji.

Iwe unogona kutibata nesu kuburikidza neWeChat, runhare kana email (yekutaura ruzivo): clvy@shenchihb.com

Thread types tinogona kupa:

Mavharuvhu edu nemapombi emagetsi anogona kugadzirwa kuti asangane nemhando dzakasiyana dzeshinda, zvinosanganisira NPT, BSPT uye G (BSPP), kuve nechokwadi chegumi muzana match nepipework system yako. Ingave yemusika wemumba kana wekutengesa kunze, isu tinokwanisa kugadzira kune yako mifananidzo.

Sarudza shinda chaiyo uye dzivirira zvisingakodzeri matambudziko. Kana usina chokwadi, siya kwatiri kuti tisimbise.