I-valve yokulawula ukuhamba kwe-coefficients (i-Cv, i-Kv kunye ne-C) yeenkqubo ezahlukeneyo zeyunithi ziyi-valve zokulawula phantsi koxinzelelo oluchanekileyo oluhlukileyo, umthamo wamanzi ojikelezayo kwiyunithi yexesha xa i-valve yokulawula ivulekile ngokupheleleyo, i-Cv, i-Kv kunye ne-C kukho. ubudlelwane phakathi kweCv = 1.156Kv, Cv = 1.167C.Eli nqaku labelana ngenkcazo, iyunithi, ukuguqulwa kunye nenkqubo ephumayo yokuphuma kwe-Cv, Kv kunye ne-C.
1, Inkcazo ye-flow coefficient
Umthamo wokuhamba kwevalve yokulawula ngulwelo oluthile kwiqondo lobushushu elithile, xa ivalve iphela kwiyunithi yoxinzelelo lokwahlukana, inani lomthamo wolwelo oqukuqelayo kwivalve yolawulo kwiyunithi yexesha, usebenzisa inkqubo eyahlukileyo yeeyunithi xa kukho iindlela ezahlukeneyo. yentetho.
Inkcazo ye-flow coefficient C
Ukunikezelwa kwe-stroke, ubushushu be-5-40 ℃ yamanzi, umehluko woxinzelelo lwevalve phakathi kweziphelo ezimbini ze-1kgf / cm2, umthamo wokuhamba ngevalve ngeyure (echazwe kwi-m3) .C yi-coefficient yokuhamba ye-metric eqhelekileyo, ilizwe lethu kwixesha elidlulileyo lisetyenziswe ixesha elide, elalibizwa ngokuba ngumthamo wokujikeleza we-C. I-coefficient yokuhamba kwe-C yi-coefficient yokuhamba kwe-metric eqhelekileyo.
② Inkcazo ye-flow coefficient Kv
Ukunikezelwa kwe-stroke, ukuhlukana koxinzelelo phakathi kweziphelo ezimbini zevalve yi-102kPa, ubushushu be-5-40 ℃ yamanzi, umthamo wamanzi ohamba nge-valve yokulawula ngeyure (echazwe kwi-m3).I-kv yinkqubo yamazwe ngamazwe yeeyunithi zokuhamba komlinganiso.
③ Inkcazo ye-flow coefficient Cv
Umthamo wamanzi kwiqondo lokushisa le-60 ° F elihamba ngevalve elawulayo ngomzuzu (echazwe kwiigaloni zase-US gal) kwi-stroke enikeziweyo kunye noxinzelelo oluhlukileyo lwe-1lb / in2 ekupheleni kwevalve.Cv yi-imperial ukuhamba komlinganiso.
2, Ukufunyanwa kweefomula zeenkqubo ezahlukeneyo zeyunithi
① Umthamo wokujikeleza C ifomula 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 γ/γ0=1, Q=1m3/h, △P=1kgf/cm2, ukuba uC uchazwa njengo-1, emva koko N=1.Ifomula kunye neyunithi yomthamo wokujikeleza C zezi zilandelayo:
Kwifomula C ngumthamo wokujikeleza;Iyunithi ye-Q yi-m3/h;γ/γ0 ngumxhuzulane okhethekileyo;△Iyunithi ye-P yi-kgf/cm2.
② Ifomula yokubala i-Cv coefficient kunye neyunithi
Xa ρ/ρ0=1, Q=1USgal/min, ∆P=1lb/in2, kwaye ukuba i-Cv=1 ichaziwe, emva koko N=1.Ifomula kunye neeyunithi ze-Cv ye-flow coefficient zilandelayo:
apho i-Cv yi-flow coefficient;U-Q use-USgal/min;ρ/ρ0 luxinaniso oluthile;kwaye ∆P iku-lb/in2.
③ Ifomula yokubala yomlinganiso we-Kv kunye neyunithi
Xa ρ/ρ0=1, Q=1m3/h, ΔP=100kPa, ukuba Kv=1, ngoko N=0.1.Ifomyula kunye neyunithi yomlinganiso wokuhamba kwe-Kv zezi zilandelayo:
apho i-Kv yi-flow coefficient;I-Q ikwi-m3/h;ρ/ρ0 luxinaniso oluthile;ΔP ikwi kPa.
3, Ukuguqulwa komthamo wokujikeleza C, i-flow coefficient Kv, i-flow coefficient Cv
① ukuhamba kwe-coefficient ye-Cv kunye nobudlelwane bokujikeleza kwe-C
apho kwaziwa ukuba i-Q ise-USgal/min;ρ/ρ0 luxinaniso oluthile;kwaye ∆P iku-lb/in2.
Xa C=1, Q=1m3/h, γ/γ0=1 (okt, ρ/ρ0=1), kunye ∆P=1kgf/cm2, endaweni yefomula ye-Cv kwimeko ye-C=1 kukuba:
Ukusuka kwizibalo, siyazi ukuba i-C=1 kunye ne-Cv=1.167 ziyalingana (okt, Cv=1.167C).
② Ukuguqulwa kwe-Cv kunye ne-Kv
Xa Kv = 1, Q = 1m3 / h, ρ / ρ0 = 1, △ P = 100kPa endaweni ye-Cv formula yokuguqulwa kweyunithi:
Oko kukuthi, i-Kv = i-1 ilingana ne-Cv = 1.156 (oko kukuthi, i-Cv = 1.156Kv).
Ngenxa yolunye ulwazi kunye neesampuli ze-valve yokulawula ukuhamba kwamandla C, i-coefficient ye-Kv kunye nenkqubo yokuhamba kwe-Cv ezintathu zokungabikho kwenkqubo yokuphuma, ukusetyenziswa kokulula ukuvelisa ukudideka.I-Changhui Instrumentation C, i-Kv, i-Cv evela kwinkcazo, isicelo seyunithi kunye nobudlelwane phakathi kwezithathu eziya kucaciswa, ukunceda abaqulunqi bobunjineli kwinkqubo yokulawula ukukhethwa kwevalve kunye nokubalwa kwamazwi ahlukeneyo okuhamba kwee-coefficients (C, Kv, Cv) ukuguqulwa kunye nokuthelekisa, ukuququzelela ukukhethwa kweevalve ezilawulayo kunokukhethwa.
Amaxabiso eCV yeevalvu zebhabhathane zeTianjin Zhongfa Valve zezi zilandelayo, ukuba kuyimfuneko, nceda ubhekisele kuyo.