Hōʻike ʻia ka coefficient kahe a me ka coefficient cavitation o ka valve i ka papa hoʻohālikelike o ke kaomi a me ka mahana o ka mea valve.

ʻO ka coefficient kahe a me ka coefficient cavitation o ka valve ua kikoʻī ʻia i ka papa hoʻohālikelike o ke kaomi a me ka mahana o ka mea valve ʻO ka mea nui o ka valve ʻo ka kahe kahe a me ka coefficient cavitation o ka valve, i loaʻa maʻamau i ka ʻikepili o nā valves i hana ʻia. ma nā ʻāina ʻoihana kiʻekiʻe, a paʻi pū ʻia ma ka hāpana. Hoʻokumu ko mākou ʻāina i ka valve ʻaʻole i loaʻa kēia ʻike ʻike, no ka mea, e kiʻi i kēia ʻāpana o ka ʻikepili pono e hana i ka hoʻokolohua e hiki ai ke kau i mua, ʻo ko mākou ʻāina kēia a me ka pae kiʻekiʻe o ka honua o ka valve gap kekahi o ka hana nui. . A, ka hoʻoheheʻe ʻana o ka valve ʻO ke kahe kahe o ka valve he ana ia o ka helu helu hiki ke kahe o ka valve, ʻoi aku ka nui o ka waiwai o ke kahe kahe, ke kahe o ka wai i loko o ka pahu i ka wā e liʻiliʻi ai ka poho kaomi. Ma muli o ke kumu helu helu KV Kahi: KV -- kahe kahe Q -- kahe ka leo m3/h δ P -- pahu poho puʻe pahu P -- wai mānoanoa kg/m3 ʻElua, pahu hoʻoheheʻe pahu Hoʻohana ʻia ka helu cavitation δ no ka hoʻoholo ʻana. he aha ke ʻano o ka hana valve e koho ai no ka hoʻokele kahe. Kahi: H1 -- kaomi mH2 -- ʻokoʻa ma waena o ke kaomi lewa a me ke kaomi mahu kukū e pili ana i ka mahana M δ P - ka ʻokoʻa ma waena o ke kaomi ma mua a ma hope o ka pahu M Ua ʻokoʻa ka coefficient cavitation δ i ʻae ʻia ma waena o nā kiwi ma muli o kā lākou hoʻonohonoho like ʻole. E like me ka mea i hoikeia ma ke kii. Inā ʻoi aku ka nui o ka coefficient cavitation i helu ʻia ma mua o ka coefficient cavitation i ʻae ʻia, kūpono ka ʻōlelo a ʻaʻole e hiki mai ka cavitation. Inā he 2.5 ka helu hoʻoheheʻe ʻae ʻia, a laila: Inā δ2.5, ʻaʻole e hiki mai ka cavitation. Ma 2.5δ1.5, hiki mai ka cavitation liʻiliʻi. Ma ka delta 1.5, hiki mai nā haʻalulu. ʻO ka hoʻohana mau ʻana i ka δ0.5 e hōʻino i ka valve a me ka paipu o lalo. ʻAʻole i hōʻike ʻia nā ʻōkuhi maʻamau a me ka hana o nā valve i ka wā e hiki mai ai ka cavitation, e waiho wale i kahi i hiki ai ka palena hana. Ma o ka helu maluna ae ua maopopo. No laila, hiki mai ka cavitation no ka mea i ka wā e hele ai ka pauma rotor i kahi ʻāpana o ka pauku emi ʻana i ke kaʻina o ka kahe ʻana o ka wai, ua hoʻoheheʻe ʻia kahi hapa o ka wai, a ʻo nā ʻōhū i hana ʻia a laila pohā i ka ʻāpana ākea ma hope o ka valve, aia ʻekolu mau hōʻike: (1) Noise (2) vibration (ʻino nui i ke kumu a me nā hale pili, ka hopena i ka haʻihaʻi luhi) (3) Poino i nā mea (erosion o ke kino valve a me ka paipu) Mai ka helu ʻana i luna, ʻaʻole paʻakikī ke ʻike i kēlā cavitation pili nui i ke kaomi H1 ma hope o ka valve. ʻO ka hoʻonui ʻana i ka H1 e hoʻololi i ke kūlana a hoʻomaikaʻi i ke ʻano: A. E hoʻokomo i ka valve haʻahaʻa i ka laina. B. E hoʻouka i kahi pā puka i loko o ka paipu ma hope o ka valve e hoʻonui i ke kū'ē. C. Wehe ka puka valve a hoʻonui pono i ka waihona, kahi e hoʻonui ai i ka manawa no ka hāhā ʻana o ka ʻōpū a hoʻemi i ka ʻino o ka cavitation. ʻO ka loiloi piha ʻana o nā ʻano ʻehā ma luna, ua hōʻuluʻulu ʻia ka valve puka, nā hiʻohiʻona nui o ka butterfly valve a me ka papa inoa o nā ʻāpana no ka maʻalahi koho. ʻElua mau ʻāpana koʻikoʻi e hana nui i ka hana valve. ʻO ke kaomi ʻana o ka valve material a me ka mahana hoʻohālikelike papa ʻaina ʻoihana insiders ʻike i ke koho ʻana i nā mea valve pono e koho e like me ke kaomi ʻenekini valve a me ka mahana kūpono, ʻaʻole like nā mea like ʻole i ka puʻe a me ka mahana, ke nānā nei mākou i ka pilina mana. ʻIke ka poʻe i loko o ka ʻoihana valve e pono ke koho ʻia ke koho ʻana i nā mea valve e like me ke kaomi ʻenekinia a me ka mahana kūpono o ka valve. ʻAʻole like ke kaomi a me ka mahana o nā mea like ʻole. E nānā kākou i ka pilina like ʻole ma waena o lākou. ʻO ke kaomi waiwai a me ka papa hoʻohālikelike ʻana i ka wela ʻO ka pākaukau hoʻohālikelike a me ka pākaukau hoʻohālikelike ʻana i ka wela Hao hina hina: He kūpono ka hao i ka wai, ka mahu, ka ea, ke kinoea a me ka aila me ke kaomi nominal PN≤ 1.0mpa a me ka mahana -10 ℃ ~ 200 ℃. ʻO nā māka maʻamau o ka hao hina hina: HT200, HT250, HT300, HT350. ʻO ka hao malleable: He kūpono no ke kaomi nominal PN≤ 2.5mpa, ka mahana o -30 ~ 300 ℃ o ka wai, ka mahu, ka ea a me ka ʻaila, nā mea hoʻohana maʻamau: KTH300-06, KTH330-08, KTH350-10. ʻO ka hao Ductile: He kūpono no ka wai, ka mahu, ka ea a me ka ʻaila me PN≤4.0MPa a me ka mahana o -30 ~ 350 ℃. ʻO nā hōʻailona maʻamau: QT400-15, QT450-10, QT500-7. I ka nānā ʻana i ka pae ʻenehana kūloko o kēia manawa, ʻaʻohe kūlike kēlā me kēia hale hana, a ʻaʻole maʻalahi nā mea hoʻohana e hoʻāʻo. Wahi a ka ʻike, ʻōlelo ʻia ʻo PN≤ 2.5mpa, pale kila. Acid resistant high silicon ductile iron: He kūpono no ka corrosive media me ka nominal pressure PN≤ 0.25mpa a me ka mahana ma lalo o 120℃. ʻO ke kila kalapona: He kūpono no ka wai, ka mahu, ka ea, ka hydrogen, ka amonia, ka nitrogen a me nā huahana petroleum me ke kaomi nominal PN≤32.0MPa a me ka mahana -30 ~ 425 ℃. ʻO nā māka maʻamau ʻo WC1, WCB, ZG25 a me ke kila maikaʻi 20, 25, 30 a me ke kila kila haʻahaʻa 16Mn. He kūpono no ka wai, ka wai kai, ka oxygen, ka ea, ka aila a me nā media ʻē aʻe me PN≤ 2.5mpa, a me ka media mahu me ka mahana -40 ~ 250 ℃, ʻo ka inoa maʻamau ZGnSn10Zn2(tin bronze), H62, HPB59-1 (keleawe), QAZ19-2, QA19-4(ke keleawe alumina). Ke keleawe wela kiʻekiʻe: He kūpono no ka mahu a me nā huahana ʻaila me ke kaomi inoa PN≤ 17.0mpa a me ka mahana ≤570 ℃. Hoʻohana maʻamau ʻo ZGCr5Mo, 1 cr5m0. ZG20CrMoV, ZG15Gr1Mo1V, 12 crmov WC6, WC9, a me nā mea ʻē aʻe. Pono ke koho kikoʻī e like me ke kaomi valve a me nā kikoʻī wela.