Kuthamanga kwa coefficient ndi cavitation coefficient of valve akufotokozedwa mu tebulo lofananitsa la kupanikizika ndi kutentha kwa zinthu za valve.

Kuthamanga kwa mpweya ndi cavitation coefficient of valve kumafotokozedwa mu tebulo lofananitsa la kupanikizika ndi kutentha kwa valve zinthu Zofunikira kwambiri za valve ndi kutuluka kwa coefficient ndi cavitation coefficient of valve, yomwe imapezeka mu data ya valves yopangidwa. m'mayiko apamwamba mafakitale, ndipo ngakhale kusindikizidwa mu zitsanzo. Dziko lathu limapanga valavu kwenikweni liribe chidziwitso ichi, chifukwa kupeza mbali iyi ya deta kuyenera kuchita kuyesera kuti athe kuika patsogolo, ili ndi dziko lathu ndi dziko lapansi lapamwamba kwambiri la kusiyana kwa valve imodzi mwa ntchito zofunika kwambiri. . A, valve flow coefficient The valve flow flow coefficient ndi muyeso wa chiwerengero cha valve flow flow flow, kuchuluka kwa kuchuluka kwa kuchuluka kwa otaya, kuthamanga kwamadzi kumadutsa mu valavu pamene kutayika kwa mphamvu kumakhala kochepa. Malinga ndi KV mtengo kuwerengera formula Komwe: KV -- flow coefficient Q -- volume flow m3/h δ P -- valve pressure loss barP -- fluid density kg/m3 Two, valve cavitation coefficient The cavitation coefficient δ value is used to kudziwa ndi mtundu wanji wa zomangamanga zomwe mungasankhe kuti muzitha kuyendetsa bwino. Kumene: H1 -- pressure mH2 -- kusiyana pakati pa kupanikizika kwa mumlengalenga ndi mpweya wochuluka wa nthunzi wofanana ndi kutentha M δ P - kusiyana pakati pa kupanikizika kusanachitike komanso pambuyo pa valve M The coefficient cavitation coefficient δ imasiyana pakati pa ma valve chifukwa cha machitidwe awo osiyanasiyana. Monga momwe chithunzichi chikusonyezera. Ngati chiwerengero cha cavitation coefficient chiri chachikulu kuposa chovomerezeka cha cavitation coefficient, mawuwo ndi ovomerezeka ndipo cavitation sidzachitika. Ngati cavitation coefficient yovomerezeka ndi 2.5, ndiye: Ngati δ2.5, cavitation sichitika. Pa 2.5δ1.5, cavitation pang'ono kumachitika. Pa delta 1.5, kugwedezeka kumachitika. Kugwiritsa ntchito δ0.5 kosalekeza kumawononga valavu ndi mapaipi otsika. Zoyambira ndi zogwirira ntchito zokhotakhota za mavavu siziwonetsa pamene cavitation imachitika, osasiyapo pomwe malire ogwirira ntchito afikira. Kudzera pamwamba mawerengedwe omveka. Choncho, cavitation kumachitika chifukwa pamene ozungulira mpope akudutsa chigawo cha kuchepa chigawo m`kati madzi inapita patsogolo otaya, mbali ya madzi ndi vaporized, ndi thovu kwaiye ndiye anaphulika mu gawo lotseguka pambuyo valavu, amene ali mawonetseredwe atatu: (1) Phokoso (2) kugwedezeka (kuwonongeka kwakukulu kwa maziko ndi zomangira zofananira, zomwe zimayambitsa kutopa) (3) Kuwonongeka kwa zipangizo (kuwonongeka kwa thupi la valve ndi chitoliro) Kuchokera kuwerengera pamwambapa, sikovuta kuona kuti cavitation zimagwirizana kwambiri ndi kuthamanga kwa H1 pambuyo pa valve. Kuchulukitsa H1 mwachiwonekere kudzasintha mkhalidwewo ndikuwongolera njira: A. Ikani ma valve otsika pamzere. B. Ikani mbale ya orifice mu chitoliro kumbuyo kwa valve kuti muwonjezere kukana. C. Chitsulo cha valve ndi chotseguka ndipo chimadziunjikira mwachindunji posungira, zomwe zimawonjezera malo ophulika ndi kuchepetsa kukokoloka kwa cavitation. Kusanthula kwatsatanetsatane kwazinthu zinayi zomwe tafotokozazi, mwachidule valavu yachipata, mawonekedwe akulu agulugufe ndi mndandanda wazosankha zosavuta. Zigawo ziwiri zofunika zimagwira ntchito yofunika kwambiri pakugwira ntchito kwa valve. Vavu zakuthupi kuthamanga ndi kutentha kuyerekeza tebulo valavu makampani Insider amadziwa kuti kusankha zipangizo valavu ayenera kusankha malinga ndi valavu injiniya kuthamanga ndi kutentha yoyenera, zipangizo zosiyanasiyana mu kuthamanga ndi kutentha chilengedwe si chimodzimodzi, timayang'ana pa ubale ulamuliro. Olowa m'makampani opanga ma valve amadziwa kuti kusankha kwa zida za valve kumayenera kusankhidwa molingana ndi kukakamizidwa kwa uinjiniya komanso kutentha kwa valve. Kupanikizika ndi kutentha kwa chilengedwe cha zipangizo zosiyana sizofanana. Tiyeni tiwone kusiyana pakati pawo. Vavu zinthu kuthamanga ndi kutentha kuyerekezera tebulo Vavu zinthu kuthamanga ndi kutentha kuyerekeza tebulo Gray kuponyedwa chitsulo: Gray kuponyedwa chitsulo ndi oyenera madzi, nthunzi, mpweya, mpweya ndi mafuta ndi mphamvu mwadzina PN≤ 1.0mpa ndi kutentha -10 ℃ ~ 200 ℃. Mitundu yodziwika bwino ya chitsulo chotuwira ndi: HT200, HT250, HT300, HT350. Malleable kuponyedwa chitsulo: Oyenera mwadzina kuthamanga PN≤ 2.5mpa, kutentha kwa -30 ~ 300 ℃ madzi, nthunzi, mpweya ndi sing'anga mafuta, zopangidwa ambiri ntchito ndi: KTH300-06, KTH330-08, KTH350-10. Ductile iron: Yoyenera madzi, nthunzi, mpweya ndi mafuta ndi PN≤4.0MPa ndi kutentha kwa -30 ~ 350 ℃. Zomwe zimagwiritsidwa ntchito kwambiri ndi: QT400-15, QT450-10, QT500-7. Poganizira zaukadaulo wamakono wapakhomo, fakitale iliyonse imakhala yosagwirizana, ndipo ogwiritsa ntchito nthawi zambiri sakhala osavuta kuyesa. Malinga ndi chidziwitso, tikulimbikitsidwa kuti PN≤ 2.5mpa, valve yachitsulo ndi yotetezeka. Acid kugonjetsedwa mkulu pakachitsulo ductile chitsulo: Oyenera TV zikuwononga ndi mphamvu mwadzina PN≤ 0.25mpa ndi kutentha m'munsimu 120 ℃. Chitsulo cha carbon: Choyenera madzi, nthunzi, mpweya, haidrojeni, ammonia, nayitrogeni ndi mafuta a petroleum okhala ndi kuthamanga kwadzina PN≤32.0MPa ndi kutentha -30 ~ 425 ℃. Ambiri ntchito kalasi ndi WC1, WCB, ZG25 ndi khalidwe zitsulo 20, 25, 30 ndi otsika aloyi structural zitsulo 16Mn. Oyenera madzi, madzi a m'nyanja, mpweya, mpweya, mafuta ndi TV zina ndi PN≤ 2.5mpa, komanso nthunzi TV ndi kutentha -40 ~ 250 ℃, mtundu ambiri ntchito ndi ZGnSn10Zn2 (malata mkuwa), H62, HPB59-1 (mkuwa), QAZ19-2, QA19-4 (aluminium bronze). Kutentha kwakukulu kwa mkuwa: Woyenera kutentha kwa nthunzi ndi mafuta a petroleum ndi kuthamanga mwadzina PN≤ 17.0mpa ndi kutentha ≤570 ℃. ZGCr5Mo yomwe imagwiritsidwa ntchito kwambiri, 1 cr5m0. ZG20CrMoV, ZG15Gr1Mo1V, 12 crmov WC6, WC9, etc. Kusankhidwa kwapadera kuyenera kukhala molingana ndi kuthamanga kwa valve ndi kutentha kwake.