He aha ka CV (ka hoʻoheheʻe kahe) o nā kiwi honua

He aha ke koena kahe o ka pahu honua

ʻO ka coefficient kahe (Cv value) o ka valve puni honua ma waena o kekahi a me nā kakini, a ʻokoʻa ka waiwai kikoʻī ma muli o ke anawaena nominal o ka valve, ke ʻano, ke ʻano o ka valve core, ka mea noho valve a me ka pololei o ka hana. Aia ma lalo iho kekahi mau laulima ma nā kūlana maʻamau:

1. Ma ka helu anawaena

ʻO ka valve puni honua ke anawaena liʻiliʻi: ʻO ke kumukūʻai Cv o ka valve puni honua liʻiliʻi me ke anawaena inoa ma waena o 1/2 ʻīniha (DN15) a me 2 ʻīniha (DN50) ma waena o 2.5 a me 20. No ka laʻana, ʻo ka waiwai Cv o ka 1/2 ʻīniha (DN15) puni honua ma kahi o 2.5 a i 4, ʻo ka waiwai Cv o kahi 1 ʻīniha a me 1 ʻīniha (DN2 a me 1 ʻīniha) Aia paha ma waena o 12 a me 20 ka waiwai CV o ka 2 Inch (DN50).

ʻO ke anawaena poʻomanaʻo pōʻai: No nā kiwi poʻo poʻo honua me ke anawaena inoa o 2-1/2 ʻīniha (DN65) a i 6 ʻīniha (DN150), ʻo ka helu Cv ma waena o 20 a me 60. No ka laʻana, ʻo ka waiwai Cv o kahi 2-1/2 ʻīniha (DN65) puni honua ma waena o 20 a me 30, ʻo ka waiwai Cv ma waena o 3 a me 30, ʻo ka Cv waiwai ma waena o 20 a me 30. 50, a ma waena paha o 45 a me 60 paha ka waiwai Cv o ka 6 Inch (DN150).

ʻO ka valve puni honua anawaena nui: ʻO nā kiwi poʻo poʻo honua nui me ke anawaena inoa i ʻoi aku ma mua o 6 ʻīniha (DN150) he mau kumu waiwai Cv nui, maʻamau ma luna o 60 a i 100. No ka laʻana, ʻo ka waiwai Cv o kahi pahu honua 8 ʻīniha (DN200) aia ma waena o 80 a me 100, a ʻo ka waiwai Cv o ka 12 ʻīniha (DN300 a ʻoi paha) ma waena o 12 ʻīniha (DN300) kiʻekiʻe paha.

2. Ma ke ʻano hana

Pololei ma waena o ka pōʻai honua: He kiʻekiʻe ka waiwai Cv, ma ke ʻano maʻamau ma waena o nā kiwi honua o ke anawaena like. No ka laʻana, ʻo ke kumu kūʻai Cv o DN50 ma kahi o 10 a i 15, a ʻo ka waiwai Cv o kahi DN100 pololei ma waena o ke ao holoʻokoʻa he 30 a 40 paha.

ʻĀpana poʻomanaʻo angle: No ka mea, he wiliwili kona ala kahe a he nui ke ku'e o ka wai, ua emi iki ka waiwai o ka Cv ma mua o ko ka pahu po'ipo'o pololei. Aia ma kahi o 8 a i 12 paha ka waiwai Cv o ka valve angle globe DN50, a ʻo ka waiwai Cv o ka valve angle globe DN100 ma kahi o 25 a 35.

3. Ma ka valve core type

pāpaʻi pāpaʻi pahu poʻo honua: He mea kiʻekiʻe ka waiwai Cv, no ka laʻana, ʻo ka waiwai Cv o kahi DN100 flat valve core globe valve he 40 a 50 paha.

ʻO ka valve conical core globe valve: Ma muli o ka pili pili loa ma waena o ka valve core a me ka noho valve, ua oi aku ka maikai o ka hana sealing, aka, ua nui ke kupaa o ka wai, a ua haahaa ka waiwai Cv. Aia paha ma waena o 30 a me 40 ka waiwai Cv o ka DN100 conical valve core globe valve.

4. E like me ka valve noho mea a me ka hana pololei

Metala valve noho globe valve: He kiʻekiʻe ka paʻakikī o ka noho valve metala a me ke kūpaʻa maikaʻi, akā ʻoi aku ka kiʻekiʻe o ka pono o ka hana. Inā kiʻekiʻe ka pololei o ka hana, hiki i ka waiwai Cv ke piʻi i kahi kiʻekiʻe kiʻekiʻe o ke ʻano o ka valve; inā ʻaʻole lawa ka pololei o ka hoʻoili ʻana, ʻaʻole kūlike ka ʻili o ka sila a hoʻemi ʻia ka waiwai Cv. No ka laʻana, ʻo ka waiwai Cv o ka DN80 metal valve seat globe valve me ka hoʻoponopono pololei kiʻekiʻe ma waena o 30 a 35, a ʻo ka waiwai Cv o ka pololei kaʻina hana maʻamau ma waena o 25 a me 30.

ʻO ka pāpaʻi palolo noho puni honua: Inā hoʻohana ʻia nā mea palupalu e like me polytetrafluoroethylene e like me nā noho valve, maikaʻi ka hana sealing, akā hiki ke hoʻololi i nā mea palupalu ma lalo o ke kiʻekiʻe kiʻekiʻe a i ʻole ke kaomi kiʻekiʻe, e pili ana i ka coefficient kahe. Loaʻa paha i ka 20 a i ka 25 ka waiwai Cv o ka valve honua noho mālie DN65.

Hōʻuluʻulu manaʻo

ʻO ka valve honua he mea hoʻokele waiwai nui. He mea nui kona kahe kahe e wehewehe ana i kona kaha kahe a pono e helu a koho pono ia. ʻO ka hoʻomaopopo ʻana i nā mea e pili ana i ka coefficient kahe e hiki ke kōkua i ke koho ʻana i ka valve globe kūpono e hōʻoia i ka hana maʻamau o ka ʻōnaehana.