Cov tswj valve ntws coefficients (Cv, Kv thiab C) ntawm cov tshuab sib txawv yog tswj li qub raws li qhov sib txawv ntawm qhov sib txawv, qhov ntim ntawm cov dej ncig hauv ib chav tsev ntawm lub sijhawm thaum lub valve qhib tag nrho, Cv, Kv thiab C muaj. kev sib raug zoo ntawm Cv = 1.156Kv, Cv = 1.167C.Kab lus no qhia txog cov ntsiab lus, chav tsev, hloov dua siab tshiab thiab tag nrho cov txheej txheem derivation ntawm Cv, Kv thiab C.
1 、 Lub ntsiab lus ntawm flow coefficient
Kev tswj lub valve muaj peev xwm txaus yog cov kua dej tshwj xeeb ntawm qhov kub thiab txias, thaum lub valve xaus rau chav sib txawv siab, tus naj npawb ntawm cov dej ntim ntws los ntawm cov tswj valve hauv ib chav tsev ntawm lub sijhawm, siv cov txheej txheem sib txawv ntawm cov chav nyob thaum muaj ntau txoj hauv kev. ntawm kev qhia.
Lub ntsiab lus ntawm flow coefficient C
Muab qhov mob stroke, qhov kub ntawm 5-40 ℃ dej, valve siab sib txawv ntawm ob qhov kawg ntawm 1kgf / cm2, qhov ntim ntawm ntws los ntawm lub valve ib teev (qhia hauv m3).C yog qhov txaus coefficient ntawm cov metric, peb lub teb chaws yav dhau los tau siv rau lub sijhawm ntev, yav tas los hu ua lub peev xwm ntawm C. Cov flow coefficient C yog cov flow coefficient ntawm cov metric.
② Lub ntsiab lus ntawm flow coefficient Kv
Muab cov hlab ntsha tawg, lub siab sib txawv ntawm ob qhov kawg ntawm lub valve yog 102kPa, qhov kub ntawm 5-40 ℃ dej, qhov ntim ntawm cov dej ntws los ntawm kev tswj valve ib teev (qhia hauv m3).kv yog thoob ntiaj teb system ntawm units flow coefficient.
③ Lub ntsiab lus ntawm ntws coefficient Cv
Qhov ntim ntawm cov dej ntawm qhov kub ntawm 60 ° F uas ntws los ntawm kev tswj lub valve ib feeb (qhia hauv US gallons US gal) rau kev mob stroke nrog lub siab sib txawv ntawm 1lb / in2 ntawm txhua qhov kawg ntawm lub valve.Cv yog lub imperial flow coefficient.
2、Derivation ntawm cov qauv rau ntau chav tsev systems
①Circulation peev xwm C formula thiab units
当γ/γ0=1,Q=1m3/h,△P=1kgf/cm2时，如C定义为1，则N=1.则流通能力C的公式及单位如下：
Thaum γ / γ0 = 1, Q = 1m3 / h, △P = 1kgf / cm2, yog C txhais tau tias 1, ces N = 1.Cov mis thiab chav tsev ntawm kev muaj peev xwm C yog raws li nram no:
Hauv cov mis C yog lub peev xwm ncig;Q unit yog m3 / h;γ/γ0 yog qhov tshwj xeeb lub ntiajteb txawj nqus;△ P unit yog kgf/cm2.
② Flow coefficient Cv xam cov mis thiab chav tsev
Thaum ρ/ρ0=1, Q=1USgal/min, ∆P=1lb/in2, thiab yog Cv=1 txhais, ces N=1.Cov mis thiab units ntawm flow coefficient Cv yog raws li nram no:
qhov twg Cv yog qhov ntws coefficient;Q yog nyob rau hauv USgal / min;ρ/ρ0 yog qhov ceev tshwj xeeb;thiab ∆P yog nyob rau hauv lb/in2.
③ Flow coefficient Kv xam cov mis thiab chav tsev
Thaum ρ/ρ0=1, Q=1m3/h, ΔP=100kPa, if Kv=1, ces N=0.1.Cov mis thiab chav tsev ntawm flow coefficient Kv yog raws li nram no:
qhov twg Kv yog tus khiav coefficient;Q yog nyob rau hauv m3 / h;ρ/ρ0 yog qhov ceev tshwj xeeb;ΔP yog nyob rau hauv kPa.
3, Kev hloov pauv ntawm cov peev txheej C, ntws coefficient Kv, ntws coefficient Cv
① flow coefficient Cv thiab kev muaj peev xwm C kev sib raug zoo
qhov twg nws paub tias Q yog nyob rau hauv USgal/min;ρ/ρ0 yog qhov ceev tshwj xeeb;thiab ∆P yog nyob rau hauv lb/in2.
Thaum C = 1, Q = 1m3 / h, γ / γ0 = 1 (ie, ρ / ρ0 = 1), thiab ∆P = 1kgf / cm2, hloov cov qauv Cv nrog cov xwm txheej ntawm C = 1 yog:
Los ntawm kev suav, peb paub tias C = 1 thiab Cv = 1.167 yog sib npaug (ie, Cv = 1.167C).
② Kev hloov pauv CV thiab Kv
Thaum Kv = 1, Q = 1m3 / h, ρ / ρ0 = 1, △ P = 100kPa substituting Cv formula for unit conversion:
Kv = 1 e¨vLv cv = 1.156 (ie, Cv = 1.156Kv).
Vim muaj qee cov ntaub ntawv thiab cov qauv ntawm kev tswj valve ntws peev C, ntws coefficient Kv thiab ntws system Cv peb tsis muaj derivation txheej txheem, kev siv yooj yim los tsim tsis meej pem.Changhui Instrumentation C, Kv, Cv los ntawm lub ntsiab lus, chav tsev daim ntawv thov thiab kev sib raug zoo ntawm peb yuav tsum tau qhia kom meej, los pab engineering designers nyob rau hauv tus txheej txheem ntawm regulating valve xaiv thiab xam ntawm sib txawv qhia ntawm flow coefficients (C, Kv, Cv) rau kev hloov dua siab tshiab thiab kev sib piv, los pab txhawb kev xaiv ntawm kev tswj cov li qub tshaj qhov kev xaiv.
CV qhov tseem ceeb ntawm npauj npaim li qub ntawm Tianjin Zhongfa Valve yog raws li hauv qab no, yog tias tsim nyog, thov xa mus rau.