Cov coefficients ntawm kev tswj lub valve ntws (Cv, Kv thiab C) ntawm cov tshuab sib txawv yog cov tswj lub valve nyob rau hauv qhov sib txawv ntawm qhov siab, qhov ntim ntawm cov dej ncig hauv ib chav ntawm lub sijhawm thaum lub valve tswj qhib tag nrho, Cv, Kv thiab C muaj kev sib raug zoo ntawm Cv = 1.156Kv, Cv = 1.167C. Tsab xov xwm no qhia txog kev txhais, chav tsev, kev hloov pauv thiab cov txheej txheem ntawm Cv, Kv thiab C.
1, Kev txhais ntawm cov coefficient ntws
Lub peev xwm ntws ntawm lub valve tswj yog cov kua dej tshwj xeeb ntawm qhov kub tshwj xeeb, thaum lub valve xaus rau qhov sib txawv ntawm lub siab, tus lej ntawm cov kua dej ntws los ntawm lub valve tswj hauv ib chav ntawm lub sijhawm, siv lub kaw lus sib txawv ntawm cov chav thaum muaj ntau txoj hauv kev qhia tawm.
Kev txhais ntawm cov coefficient ntws C
Muab qhov mob stroke, qhov kub ntawm 5-40 ℃ dej, qhov sib txawv ntawm lub valve siab ntawm ob qho kawg ntawm 1kgf / cm2, qhov ntim ntawm cov dej ntws los ntawm lub valve ib teev (qhia hauv m3). C yog cov coefficient ntws ntawm cov metric sib xws, peb lub tebchaws yav dhau los tau siv ntev, yav dhau los hu ua lub peev xwm ncig ntawm C. Cov coefficient ntws C yog cov coefficient ntws ntawm cov metric sib xws.
② Kev txhais ntawm cov coefficient ntws Kv
Muab qhov mob stroke, qhov sib txawv ntawm qhov siab ntawm ob sab kawg ntawm lub valve yog 102kPa, qhov kub ntawm 5-40 ℃ dej, qhov ntim ntawm cov dej ntws los ntawm lub valve tswj ib teev (qhia hauv m3). kv yog lub kaw lus thoob ntiaj teb ntawm cov chav nyob.
③ Kev txhais ntawm cov coefficient ntws Cv
Qhov ntim dej ntawm qhov kub ntawm 60°F uas ntws los ntawm lub qhov tswj hwm ib feeb (qhia hauv US gallons US gal) rau ib qho stroke nrog lub siab sib txawv ntawm 1lb/in2 ntawm txhua qhov kawg ntawm lub qhov valve.Cv yog imperial flow coefficient.
2, Kev muab cov qauv rau cov kab ke sib txawv
① Lub peev xwm ncig C mis thiab cov chav nyob
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 tias C yog txhais tias yog 1, ces N=1. Cov mis thiab chav ntawm lub peev xwm ncig C yog raws li nram no:
Hauv cov mis C yog lub peev xwm ncig; Q chav yog m3/h; γ/γ0 yog lub zog tshwj xeeb; △P chav yog kgf/cm2.
② Cov qauv xam ntawm cov coefficient ntawm cov dej ntws Cv thiab chav tsev
Thaum ρ/ρ0=1, Q=1USgal/min, ∆P=1lb/in2, thiab yog tias Cv=1 tau txhais, ces N=1. Cov mis thiab cov chav ntawm cov coefficient ntws Cv yog raws li nram no:
qhov twg Cv yog tus coefficient ntawm kev ntws; Q yog nyob rau hauv USgal/min; ρ/ρ0 yog qhov ceev tshwj xeeb; thiab ∆P yog nyob rau hauv lb/in2.
③ Cov qauv xam ntawm cov coefficient Kv thiab chav tsev
Thaum ρ/ρ0=1, Q=1m3/h, ΔP=100kPa, yog Kv=1, ces N=0.1. Cov mis thiab chav ntawm cov coefficient ntws Kv yog raws li nram no:
qhov twg Kv yog tus coefficient ntawm kev ntws; 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 lub peev xwm ncig C, coefficient ntws Kv, coefficient ntws Cv
① kev sib raug zoo ntawm cov coefficient ntws Cv thiab kev muaj peev xwm ncig C
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 (piv txwv li, ρ/ρ0=1), thiab ∆P=1kgf/cm2, hloov cov mis Cv nrog rau qhov xwm txheej ntawm C=1 yog:
Los ntawm cov kev xam, peb paub tias C=1 thiab Cv=1.167 yog sib npaug (piv txwv li, Cv=1.167C).
② Kev hloov pauv Cv thiab Kv
Thaum Kv = 1, Q = 1m3 / h, ρ / ρ0 = 1, △ P = 100kPa hloov Cv mis rau kev hloov pauv chav tsev:
Uas yog, Kv = 1 yog sib npaug rau Cv = 1.156 (piv txwv li, Cv = 1.156Kv).
Vim muaj qee cov ntaub ntawv thiab cov qauv ntawm kev tswj lub valve flow capacity C, flow coefficient Kv thiab flow system Cv peb tsis muaj cov txheej txheem derivation, kev siv yooj yim los tsim kev tsis meej pem. Changhui Instrumentation C, Kv, Cv los ntawm kev txhais, daim ntawv thov chav tsev thiab kev sib raug zoo ntawm peb kom tau meej, los pab cov neeg tsim qauv engineering hauv cov txheej txheem ntawm kev tswj hwm kev xaiv valve thiab kev xam cov lus qhia sib txawv ntawm cov coefficients flow (C, Kv, Cv) rau kev hloov pauv thiab kev sib piv, los pab txhawb kev xaiv cov tswj hwm li qub dua li kev xaiv.
Cov nqi CV ntawm npauj npaim li qub ntawm Tianjin Zhongfa Valve yog raws li nram no, yog tias tsim nyog, thov saib.