He aha ka ʻokoʻa ma waena o nā kūlana NPT, BSP a me G?

ʻO ka 'pitfall' maʻalahi loa i ke koho ʻana i nā kiwi a me nā mea pono

Ma nā nīnau nīnau he nui o nā mea kūʻai aku, ʻike pinepine mākou i nā kūlana e like me kēia:

"Makemake au i ka pahu kinipōpō me nā kaula wahine ma nā ʻaoʻao ʻelua."

"Pono, he aha ka pae maʻamau āu e makemake ai?"

"He milo maʻamau wale nō - e like me ka paipu wai."

Hana ʻia kēia ʻano kamaʻilio kokoke i kēlā me kēia pule. ʻO ke koho ʻana i ka maʻamau milo hewa kekahi o nā pilikia maʻamau a me ke kumu kūʻai i ke kūʻai ʻana i ka valve. Inā ʻaʻole hiki ke hoʻokomo ʻia ka valve ma hope o ke kūʻai ʻana, a inā ʻaʻole i hoʻopaʻa ʻia akā ʻaʻole i hoʻopaʻa pono ʻia, e alakaʻi ana i nā leaks, nā hopena mai ka liʻiliʻi liʻiliʻi i ka pono e hana hou i ka ʻōnaehana holoʻokoʻa.

I kēia lā, ma kēia ʻatikala pōkole, e wehewehe mākou i hoʻokahi a no nā mea āpau ʻekolu i huikau pinepine ʻia: NPT, BSP a me G.、、

I. E hoʻomaka kākou me ka ʻokoʻa nui loa: he 'cone' kekahi, he 'cylinder' kekahi.

ʻO kēia ke kumu no ka hoʻomaopopo ʻana i nā ʻokoʻa ʻē aʻe.

ʻAno milo

ʻAno milo	Inoa piha	Huina alakai	Hoʻolālā	ʻano hoʻopaʻa
NPT	Uila Paipu Tapered Lahui ʻAmelika	60°	Loko liʻiliʻi (1:16 taper)	Hoʻopaʻa ʻia e ke kaula ponoʻī
BSPT (mahele o ka moʻo BSP)	Uila Paipu Tapered Standard Pelekania	55°	Loko liʻiliʻi (1:16 taper)	Hoʻopaʻa ʻia e ke kaula ponoʻī
G (mahele o ka moʻo BSP)	Pilikia Paipala Prismatic maʻamau Pelekane (BSPP)	55°	ʻO ke kaula kilika (ʻaʻohe liʻiliʻi)	Hoʻopaʻa ʻia e ka maka hope a i ʻole ka gasket
BSP	ʻO ke kaula paipu maʻamau Pelekane (hui pū)	—	Loaʻa iā BSPT (tapered) a me BSPP (cylindrical)	Ma muli o ke ʻano kikoʻī

Ma kahi pōkole:

NPT = ʻAmelika maʻamau tapered thread

BSPT = ʻO ke kaula liʻiliʻi maʻamau Pelekane

Loko G (BSPP) = Loko like like maʻamau o Pelekania

ʻO ka NPT a me ka BSPT he mau kaula liʻiliʻi me ka ratio liʻiliʻi like (1:16), akā ʻokoʻa lākou i ke kihi o ka milo (NPT he 60°, ʻoiai ʻo BSPT he 55°).

II. He wehewehe kikoʻī: He aha ka NPT, BSP a me G?

1. NPT Threads (American Standard)

Helu maʻamau: ASME B1.20.1

ʻO nā hiʻohiʻona: 60° ke kihi milo, 1:16 liʻiliʻi

ʻO ke kumu hoʻopaʻa: Loaʻa ʻia ke sila ma o ka hoʻopili pono ʻana o nā kaula ponoʻī; ʻaʻole koi ʻia ka gasket sealing

Nā ʻāina maʻamau: ʻO ʻAmelika Hui Pū ʻIa, Kanada a me nā ʻāina ʻē aʻe e hahai ana i ka ʻōnaehana maʻamau ʻAmelika

ʻO nā kikoʻī kikoʻī o ka pahu pōlele maʻamau: 1/4' NPT, 3/8' NPT, 1/2" NPT

'Ōlelo Aʻo: Pono nā lola NPT i ka hoʻohana ʻana i ka tape PTFE a i ʻole ka mea hoʻopaʻa kaula; He mea koʻikoʻi ka mana torque i ka wā e ʻākoakoa ai, no ka mea, ʻo ka hoʻopaʻa ʻana i hiki ke hoʻokaʻawale i ke kaula wahine.

2. Nā loina BSP (British Standard)

ʻO ka BSP kahi huaʻōlelo maʻamau e hoʻopili ana i ʻelua ʻano, kahi e huikau ai ka poʻe he nui:

BSPT (Uila Paipu Kūlana Pelekane)	G pae / BSPP (British Standard Pipe Thread)
Helu maʻamau	BS 21	BS 2779 / ISO 228-1
Huina Angle	55°	55°
Kūkulu	Loko liʻiliʻi (1:16 taper)	ʻO ke kaula kuʻimaka (ʻaʻole liʻiliʻi)
Kaʻina Sila	Hoʻopaʻa paʻa iā ia iho (koi i ka lipine Teflon)	Hoʻopaʻa ʻia e kahi sila maka (e laʻa. O-ring, holoi palahalaha, holoi keleawe)
Nā noi maʻamau	Nā ʻāina Commonwealth, ʻEulopa a me nā ʻāpana o Asia	Hoʻohana ʻia ma ka honua holoʻokoʻa, ʻoi loa ma ʻEulopa a me Asia
Nui Poepoe Ma'amau	1/4"BSPT,3/8"BSPT,1/2"BSPT	G1/4, G3/8, G1/2

ʻO kēia kahi e waiho ai ka manaʻo kuhihewa nui loa: manaʻo ka poʻe he 'like nā kaula BSP me nā kaula G', akā ʻaʻole pololei kēia. He ʻano BSP nā pae G, akā ʻo BSP pū kekahi me BSPT. He cylindrical nā lola G, ʻoiai ua hoʻopaʻa ʻia nā milo BSPT; ʻokoʻa loa nā loina hoʻopaʻa ʻana ma hope o nā mea ʻelua, ʻaʻole pono e hoʻohana like ʻia.

III. Hoʻokahi papa e hoʻomaopopo i nā ʻokoʻa a pau

Nā Koina Hoʻohālikelike	NPT	BSPT	G (BSPP)
Pūnaehana maʻamau	kūlana ʻAmelika	Kūlana Pelekane	British Standard (ʻike ʻia ma ka honua)
Koho niho	60°	55°	55°
Hoʻolālā	Loko liʻiliʻi	Loko liʻiliʻi	milo pōʻalo
Taper	1:16	1:16	ʻAʻohe
Kaʻina Sila	Sila ʻula (i ʻōwili ʻia me ka lipine Teflon)	Sila kaula (me ka lipine Teflon)	Sila maka (gasket/O-ring)
ʻO ka'/ ma ke code	e.g. 1/2" NPT	e.g. 1/2" BSPT	e.g. G1/2
Hiki ke hoʻololi?	ʻAʻole hiki ke hoʻololi me BSP	ʻAʻole hiki ke hoʻololi me NPT	ʻAʻole hiki ke hoʻololi me BSPT

IV. Pehea ʻoe e ʻike koke ai i ka ʻokoʻa ma ka hana?

Inā loaʻa iā ʻoe kahi laʻana ma kou lima me ka ʻole o ka lepili, hiki iā ʻoe ke ʻike iā ia penei:

Kaʻina 1: E nānā i ka ʻaoʻao o ka pae (koi i ke ana o ke kaula a i ʻole ka mea hōʻike milo)

60° pili pili → NPT

55° ʻaoʻao pae → BSP moʻo (G a i ʻole BSPT)

Ka Papa Hana 2: E nānā i ke ʻano o ka sila

ʻO ʻO ThrPono nā eads i ka lipine Teflon a i ʻole sealant → NPT a i ʻole BSPT (nā kaula i hoʻopaʻa ʻia)

Pono i ka mea holoi palahalaha, O-ring a i ʻole ka mea holoi keleawe → G thread (cylindrical threads)

Kaʻina 3: E helu i ka helu o nā milo (ke ʻano koho wikiwiki)

No ka nui inoa like, ʻokoʻa ka helu o nā milo i kēlā me kēia ʻīniha ma waena o NPT a me BSP. No ka laʻana, 1/2":

NPT: 14 mau kaula no ka ʻīniha

BSP (G/BSPT): 14 mau kaula i kēlā me kēia ʻīniha (like kēia nui no nā mea ʻelua, e maʻalahi ai ka huikau)

Eia nō naʻe, no ka 3/4": He 14 mau kaula ka NPT a he 14 mau kaula ka BSP (ua like nō)

Aia ka ʻokoʻa ʻoiaʻiʻo ma ke kihi o ka milo a me ka liʻiliʻi, he paʻakikī ke ʻike ʻia me ka maka ʻōlohelohe; ʻO ke ala hilinaʻi loa ʻo ia ka hoʻohana ʻana i kahi anana thread.

Hanana 4: E nānā i ka ʻāina kumu a i ʻole nā ​​koi o ka mea kūʻai aku

Inā hoʻokumu ʻia ka mea kūʻai ma US a ʻo nā kiʻi e kuhikuhi i ka ASME → NPT

Inā hoʻokumu ʻia ka mea kūʻai ma ʻEulopa a i ʻole Commonwealth a ʻo nā kaha kiʻi e kuhikuhi iā BS a i ʻole ISO → BSP

Inā hōʻike nā kaha kiʻi iā 'G' i ukali ʻia e kahi helu (e laʻa. he mea holoi holoi

V. He aha ka hopena inā hewa ke koho? (Nā hihia ola maoli)

Ka hihia 1: Ua kūʻai kekahi mea hana mea hana i kahi pūʻulu o nā puʻupuʻu pōpō me nā kaula i loko G1/2, akā ʻo nā kaula waho ma ka paipu o ka mea kūʻai aku ʻo NPT 1/2. Ua hoʻāʻo kekahi mea hana e wili i ka pahu me ka ikaika no ʻehā huli ʻana akā ʻaʻole hiki iā ia ke hoʻohuli hou; i ka hoʻohana hou ʻana i ka ikaika me kahi kīwī, ua ʻoki ʻia nā kaula o ke kino valve, i hiki ʻole ke hoʻohana ʻia ka pūʻulu holoʻokoʻa.

Kūlana 2: Ua hoʻokomo ke keʻena keʻena i ka pahu kinipōpō me kahi milo waho BSPT i kahi kuʻi me ka milo kūloko G. Ua manaʻo ʻo ia 'e pili ana i ka pololei' i ka wā i hoʻopaʻa ʻia ai, akā ua hōʻike ʻia kahi hoʻāʻo kaomi i kahi leak liʻiliʻi. He ʻekolu lā o ka hoʻokolokolo ʻana a ʻike ʻia ʻaʻole kūpono nā lola—ua wili ʻia kahi milo liʻiliʻi i loko o kahi milo i loko o ka cylindrical, me nā kaula mua wale nō e hoʻopili ai, a ua lawa ʻole ka ʻili o ka sila.

Haʻawina: I ka wā e pili ana i nā pae mismatches, ʻaʻohe mea e like me ka 'kokoke'. ʻO ka ʻokoʻa o 1° wale nō ma ke kihi o ka milo ka ʻokoʻa ma waena o ka hiki ʻole ke hoʻopili i ka ʻāpana a me ka hiki ʻole ke hoʻokō i kahi sila.

VI. Nā Manaʻo Manaʻo hope no ke kūʻai ʻana i nā limahana a me nā ʻenekinia

Ma mua o kou kau ʻana i kahi kauoha, e ʻoluʻolu e hōʻoia ʻoe i kēia mau kikoʻī ʻekolu:

Paena pae (NPT a i ʻole BSP/G?)

ʻO ke ʻano o ka milo (tapered a cylindrical?)

Ka nui o ka milo (e.g. 1/4', 3/8', 1/2")

E hōʻoia i ka wehewehe pono ʻana o nā ana ma nā kiʻi:

Maʻamau US: kākau i ka 1/2-14 NPT

ʻO ke kūlana liʻiliʻi Pelekania: kākau i 1/2 BSPT

Kūlana like ʻole Pelekania: kākau G1/2 a i ʻole 1/2 BSPP

ʻAʻole maopopo e pili ana i kāu kikoʻī pili i ke kaula paipu? Aia mākou e kōkua iā ʻoe e hōʻoia iā lākou.

ʻO ka hoʻohālikelike ʻana i ke kaula ka mea nui loa - a ʻoi aku ka maikaʻi o nā hewa - ʻano o kahi ʻōnaehana pipework. Hiki ke hoʻohana ʻole ʻia kahi kuhi hewa hoʻokahi i ka maʻamau o ka pae holoʻokoʻa, a i ʻole ke alakaʻi ʻana i nā leaka a me ka pono o ka hana hou ʻana ma ka ʻōnaehana pipework holoʻokoʻa.

Inā loaʻa iā ʻoe nā laʻana e like me nā kiwi pōpō, nā paipu paipu a i ʻole nā ​​​​mea hoʻohui, a i ʻole he kiʻi o kahi kaula a maopopo ʻole ʻoe i ka maʻamau - e ʻoluʻolu e hoʻouna mai iā mākou i kēlā me kēia manawa, a e hōʻoia mākou iā lākou no ʻoe me ka uku ʻole.

ʻAʻole mākou e hana i nā 'manaʻo koʻikoʻi'; Hoʻopili mākou i nā mea maʻamau a lawe i nā ana maoli me ka hoʻohana ʻana i nā ana pae e hāʻawi iā ʻoe i kahi pane pololei.

Pehea e hōʻoia ai:

E kiʻi i ke kiʻi akaka o ka maka hope loa a hoʻouna mai iā mākou.

ʻOi aku ka maʻalahi inā loaʻa iā ʻoe kahi laʻana kino, no ka mea hiki iā mākou ke ana pono iā ia me ka hoʻohana ʻana i kahi anana thread.

Hiki iā ʻoe ke hoʻokaʻaʻike mai iā mākou ma o WeChat, kelepona a leka uila paha (nā kikoʻī pili): clvy@shenchihb.com

Nā ʻano thread hiki iā mākou ke hāʻawi:

Hiki ke hoʻopilikino ʻia kā mākou mau kinipōpō pōleʻa a me nā paipu paipu no ka hoʻokō ʻana i nā ʻano maʻamau o ke kaula, me ka NPT, BSPT a me G (BSPP), e hōʻoiaʻiʻo ana i kahi pāʻani 100 pākēneka me kāu ʻōnaehana pipework. Inā no ka mākeke kūloko a i ʻole no ka lawe ʻana aku, hiki iā mākou ke hana i kāu mau kaha kiʻi.

E koho i ke kaula kūpono a pale i nā pilikia pono ʻole. Inā maopopo ʻole ʻoe, e waiho iā mākou e hōʻoia.