Lub ndlwg coefficient thiab cavitation coefficient ntawm lub valve yog cov ncauj lus kom ntxaws nyob rau hauv cov lus sib piv ntawm lub siab thiab kub ntawm cov khoom valve.

Cov dej coefficient thiab cavitation coefficient ntawm lub valve yog cov ncauj lus kom ntxaws nyob rau hauv cov lus sib piv ntawm lub siab thiab kub ntawm cov khoom siv valve Qhov tseem ceeb ntawm lub valve yog qhov txaus coefficient thiab cavitation coefficient ntawm lub valve, uas feem ntau muaj nyob rau hauv cov ntaub ntawv ntawm li qub tsim. nyob rau hauv advanced industrial teb chaws, thiab txawm luam tawm nyob rau hauv cov qauv. Peb lub teb chaws tsim lub valve yeej tsis muaj cov ntaub ntawv no nam, vim hais tias tau qhov no nam ntawm cov ntaub ntawv yuav tsum tau ua qhov kev sim kom muaj peev xwm muab tso rau pem hauv ntej, qhov no yog peb lub teb chaws thiab lub ntiaj teb no advanced theem ntawm lub valve kis ib tug ntawm cov tseem ceeb kev ua tau zoo. . A, valve flow coefficient Lub valve flow coefficient yog ib qho kev ntsuas ntawm lub valve flow peev Performance index, qhov ntau dua tus nqi coefficient, cov kua ntws los ntawm lub valve thaum lub siab poob me me. Raws li KV tus nqi suav mis nyob qhov twg: KV - flow coefficient Q - ntim ntws m3 / h δ P - valve siab poob barP - kua ntom ntom kg / m3 Ob, valve cavitation coefficient Lub cavitation coefficient δ yog siv los txiav txim hom kev tsim valve xaiv rau kev tswj dej ntws li cas. Qhov twg: H1 - siab mH2 - qhov sib txawv ntawm atmospheric siab thiab saturated vapor siab sib xws rau qhov kub thiab txias M δ P - qhov sib txawv ntawm lub siab ua ntej thiab tom qab valve M Qhov tso cai rau cavitation coefficient δ txawv ntawm li qub vim lawv cov kev sib txawv. Raws li pom hauv daim duab. Yog tias qhov ntsuas cavitation coefficient ntau dua li qhov tso cai cavitation coefficient, cov lus qhia siv tau thiab cavitation yuav tsis tshwm sim. Yog hais tias qhov tso cai cavitation coefficient yog 2.5, ces: Yog hais tias δ2.5, cavitation yuav tsis tshwm sim. Ntawm 2.5δ1.5, me ntsis cavitation tshwm sim. Ntawm delta 1.5, vibrations tshwm sim. Kev siv txuas ntxiv ntawm δ0.5 yuav ua rau lub valve puas thiab cov kav dej hauv qab. Qhov yooj yim thiab kev khiav hauj lwm tus yam ntxwv nkhaus ntawm li qub tsis qhia thaum cavitation tshwm sim, cia nyob ib leeg lub ntsiab lus ntawm kev khiav hauj lwm txwv mus txog. Los ntawm kev suav saum toj no yog qhov tseeb. Yog li ntawd, cavitation tshwm sim vim hais tias thaum lub rotor twj tso kua mis dhau los ntawm ib seem ntawm shrinking seem nyob rau hauv cov txheej txheem ntawm cov kua ceev ceev, ib feem ntawm cov kua yog vaporized, thiab cov npuas generated ces tawg nyob rau hauv lub qhib seem tom qab lub valve, uas muaj peb manifestations: (1) Lub suab nrov (2) kev vibration (kev puas tsuaj loj rau lub hauv paus thiab cov qauv tsim, ua rau qaug zog tawg) (3) Kev puas tsuaj rau cov khoom siv (kev yaig ntawm lub cev lub cev thiab cov yeeb nkab) Los ntawm kev suav saum toj no, nws tsis yooj yim pom tias cavitation. Nws muaj feem xyuam rau lub siab H1 tom qab lub valve. Kev nce H1 yuav pom tseeb hloov qhov xwm txheej thiab txhim kho txoj hauv kev: A. Nruab valve qis hauv kab. B. Nruab ib lub phaj orifice nyob rau hauv cov yeeb nkab tom qab lub valve kom muaj zog. C. Lub qhov hluav taws xob valve yog qhib thiab ncaj qha mus rau hauv lub reservoir, uas ua rau kom qhov chaw npuas bursting thiab txo cov cavitation yaig. Kev tsom xam ntawm plaub yam saum toj no, suav nrog lub rooj vag valve, npauj npaim valve cov yam ntxwv tseem ceeb thiab cov npe tsis muaj npe rau kev xaiv yooj yim. Ob qhov tsis tseem ceeb ua lub luag haujlwm tseem ceeb hauv kev ua haujlwm valve. Valve cov khoom siv siab thiab kub sib piv lub rooj valve kev lag luam sab hauv paub tias kev xaiv cov khoom siv valve yuav tsum xaiv raws li lub valve engineering siab thiab siv qhov kub thiab txias, cov ntaub ntawv sib txawv hauv qhov siab thiab qhov kub thiab txias tsis zoo ib yam, peb saib kev tswj kev sib raug zoo. Cov neeg sab hauv hauv kev lag luam valve paub tias kev xaiv cov khoom siv valve yuav tsum raug xaiv raws li kev tsim hluav taws xob siab thiab qhov ntsuas kub ntawm lub valve. Lub siab thiab kub ib puag ncig ntawm cov khoom sib txawv tsis zoo ib yam. Cia wb mus saib qhov sib txawv ntawm kev sib raug zoo ntawm lawv. Valve cov ntaub ntawv siab thiab kub sib piv rooj Valve khoom siab thiab kub sib piv rooj Grey cam khwb cia hlau: Grey cam khwb cia hlau yog haum rau dej, chav, cua, roj thiab roj nrog nominal siab PN≤ 1.0mpa thiab kub -10 ℃ ~ 200 ℃. Cov qib zoo ntawm cov hlau cam yog: HT200, HT250, HT300, HT350. Malleable cam khwb cia hlau: Haum rau nominal siab PN≤ 2.5mpa, kub ntawm -30 ~ 300 ℃ dej, chav, cua thiab roj nruab nrab, feem ntau siv hom yog: KTH300-06, KTH330-08, KTH350-10. Ductile hlau: Haum rau dej, chav, cua thiab roj nrog PN≤4.0MPa thiab kub ntawm -30 ~ 350 ℃. Cov khoom siv feem ntau yog: QT400-15, QT450-10, QT500-7. Nyob rau hauv qhov kev pom ntawm cov thev naus laus zis hauv tsev tam sim no, txhua lub Hoobkas tsis sib xws, thiab cov neeg siv feem ntau tsis yooj yim rau kev sim. Raws li kev paub dhau los, nws raug pom zoo tias PN≤ 2.5mpa, steel valve muaj kev nyab xeeb. Acid resistant siab silicon ductile hlau: Haum rau corrosive media nrog nominal siab PN≤ 0.25mpa thiab kub hauv qab 120 ℃. Cov pa roj carbon steel: Haum rau dej, chav dej, cua, hydrogen, ammonia, nitrogen thiab roj av cov khoom nrog nominal siab PN≤32.0MPa thiab kub -30 ~ 425 ℃. Cov qib siv feem ntau yog WC1, WCB, ZG25 thiab cov hlau zoo 20, 25, 30 thiab qis alloy structural steel 16Mn. Haum rau dej, dej hiav txwv, oxygen, huab cua, roj thiab lwm yam xov xwm nrog PN≤ 2.5mpa, nrog rau cov khoom siv hluav taws xob nrog qhov kub thiab txias -40 ~ 250 ℃, cov khoom siv feem ntau yog ZGnSn10Zn2 (tin bronze), H62, HPB59-1 (Brass), QAZ19-2, QA19-4 (Aluminium Bronze). Kub kub tooj liab: Haum rau chav thiab roj av khoom nrog nominal siab PN≤ 17.0mpa thiab kub ≤570 ℃. Feem ntau siv hom ZGCr5Mo, 1 cr5m0. ZG20CrMoV, ZG15Gr1Mo1V, 12 crmov WC6, WC9, thiab lwm yam. Kev xaiv tshwj xeeb yuav tsum ua raws li lub valve siab thiab kub specifications.