Ii-coefficients zokuhamba kwevalvu yokulawula (i-Cv, i-Kv kunye ne-C) zeenkqubo ezahlukeneyo zeeyunithi ziivalvu zokulawula phantsi koxinzelelo oluzinzileyo lomahluko, umthamo wamanzi ojikeleza kwiyunithi yexesha xa ivalvu yokulawula ivuliwe ngokupheleleyo, i-Cv, i-Kv kunye ne-C kukho ubudlelwane phakathi kwe-Cv = 1.156Kv, i-Cv = 1.167C. Eli nqaku labelana ngenkcazo, iyunithi, ukuguqulwa kunye nenkqubo epheleleyo yokufumana i-Cv, i-Kv kunye ne-C.
1. Inkcazo ye-flow coefficient
Umthamo wokuhamba kwevalvu yokulawula lulwelo oluthile kubushushu obuthile, xa ivalvu iphela ngenxa yoxinzelelo lomahluko weyunithi, inani lomthamo wolwelo oluhamba ngevalvu yokulawula kwiyunithi yexesha, kusetyenziswa inkqubo eyahlukileyo yeeyunithi xa kukho iindlela ezahlukeneyo zokubonakalisa.
Inkcazo ye-flow coefficient C
Ngenxa yestroke, ubushushu bamanzi angama-5-40 ℃, umahluko phakathi koxinzelelo lwevalvu phakathi kweziphelo ezimbini ze-1kgf/cm2, umthamo wokuhamba ngevalvu ngeyure (ochazwe kwi-m3). I-C yi-flow coefficient ye-common metric, ilizwe lethu kwixesha elidlulileyo belisetyenziswa ixesha elide, elalisaziwa ngokuba ngumthamo wokujikeleza kwe-C. I-flow coefficient C yi-flow coefficient ye-common metric.
② Inkcazelo ye-flow coefficient Kv
Ngenxa yestroke, umahluko woxinzelelo phakathi kweziphelo ezimbini zevalvu yi-102kPa, ubushushu be-5-40 ℃ yamanzi, umthamo wamanzi ahamba ngevalvu yokulawula ngeyure (echazwe kwi-m3). I-kv yinkqubo yamazwe ngamazwe ye-units flow coefficient.
③ Inkcazelo ye-flow coefficient Cv
Umthamo wamanzi kubushushu obuyi-60°F ohamba ngevalvu elawulayo ngomzuzu (echazwa kwiigaloni zase-US iigaloni zase-US) kwistroke ethile enoxinzelelo olwahlukileyo lwe-1lb/in2 kwicala ngalinye levalvu. I-Cv yi-imperial flow coefficient.
2, Ukufunyanwa kweefomyula kwiinkqubo ezahlukeneyo zeeyunithi
①Umthamo wokujikeleza umbane Ifomula ka-C kunye neeyunithi
当γ/γ0=1，Q=1m3/h，△P=1kgf/cm2时，如C定为1，则N=1。则流通能力C的公式及单位如下:
Xa i-γ/γ0=1, Q=1m3/h, △P=1kgf/cm2, ukuba u-C uchazwa njengo-1, ngoko u-N=1. Ifomula kunye neyunithi yomthamo wokujikeleza u-C zezi zilandelayo:
Kwifomula u-C ngumthamo wokujikeleza kwegazi; iyunithi ye-Q yi-m3/h; i-γ/γ0 ngumthamo othile womxhuzulane; iyunithi ye-△P yi-kgf/cm2.
② I-flow coefficient Cv ifomyula kunye neyunithi yokubala
Xa ρ/ρ0=1, Q=1USgal/min, ∆P=1lb/in2, kwaye ukuba i-Cv=1 ichaziwe, ngoko ke N=1. Ifomula kunye neeyunithi ze-flow coefficient Cv zezi zilandelayo:
apho i-Cv yi-flow coefficient; i-Q ikwi-USgal/min; i-ρ/ρ0 yi-specific density; kwaye i-∆P ikwi-lb/in2.
③ Ifomula yokubala i-Flow coefficient Kv kunye neyunithi
Xa ρ/ρ0=1, Q=1m3/h, ΔP=100kPa, ukuba Kv=1, ngoko N=0.1. Ifomula kunye neyunithi ye-flow coefficient Kv zezi zilandelayo:
apho i-Kv yi-flow coefficient; i-Q ikwi-m3/h; i-ρ/ρ0 yi-specific density; i-ΔP ikwi-kPa.
3. Ukuguqulwa komthamo wokujikeleza kwegazi C, i-flow coefficient Kv, i-flow coefficient Cv
① i-flow coefficient Cv kunye nomthamo wokujikeleza kwegazi C ubudlelwane
apho kwaziwa khona ukuba u-Q ukwi-USgal/min; u-ρ/ρ0 luxinano oluthile; kwaye u-∆P ukwi-lb/in2.
Xa u-C=1, u-Q=1m3/h, u-γ/γ0=1 (oko kukuthi, u-ρ/ρ0=1), kunye no-∆P=1kgf/cm2, ukufaka ifomula ye-Cv endaweni yemeko ka-C=1 ngu:
Ukusuka kwiibalo, siyazi ukuba u-C=1 kunye no-Cv=1.167 zilingana (oko kukuthi, u-Cv=1.167C).
② Uguqulelo lwe-Cv kunye ne-Kv
Xa i-Kv = 1, Q = 1m3 / h, ρ / ρ0 = 1, △ P = 100kPa endaweni yefomula ye-Cv yokuguqulwa kweyunithi:
Oko kukuthi, i-Kv = 1 ilingana ne-Cv = 1.156 (oko kukuthi, i-Cv = 1.156Kv).
Ngenxa yolwazi oluthile kunye neesampuli zomthamo wokuhamba kwevalvu yokulawula i-C, i-flow coefficient Kv kunye nenkqubo yokuhamba kwe-Cv ezintathu ukungabikho kwenkqubo yokufunyanwa, ukusetyenziswa kwe-Changhui Instrumentation C, Kv, Cv ukusuka kwinkcazo, isicelo seyunithi kunye nolwalamano phakathi kwezi zintathu eziza kucaciswa, ukunceda abayili bobunjineli kwinkqubo yokulawula ukhetho lwevalvu kunye nokubala iintetho ezahlukeneyo ze-flow coefficients (C, Kv, Cv) zokuguqula kunye nokuthelekisa, ukwenza lula ukukhetha iivalvu ezilawulayo kunokukhetha.
Amaxabiso e-CV eevalvu zebhabhathane zeTianjin Zhongfa Valve ngala alandelayo, ukuba kuyimfuneko, nceda ujonge kuwo.