Ma coefficients a kayendedwe ka ma valve olamulira (Cv, Kv ndi C) a machitidwe osiyanasiyana a mayunitsi ndi ma valve olamulira pansi pa kupanikizika kosiyana kokhazikika, kuchuluka kwa madzi komwe kumazungulira mu unit ya nthawi pamene valavu yolamulira yatsegulidwa kwathunthu, Cv, Kv ndi C pali ubale pakati pa Cv = 1.156Kv, Cv = 1.167C. Nkhaniyi ikugawana tanthauzo, unit, conversion ndi exhaustive derivation process ya Cv, Kv ndi C.
1, Tanthauzo la kuchuluka kwa madzi oyenda
Mphamvu ya kayendedwe ka valavu yowongolera ndi madzi enieni pa kutentha kwinakwake, pamene valavuyo imatha chifukwa cha kuthamanga kosiyana kwa unit, kuchuluka kwa kuchuluka kwa madzi omwe akuyenda kudzera mu valavu yowongolera mu unit ya nthawi, pogwiritsa ntchito njira yosiyana ya mayunitsi pamene pali njira zosiyanasiyana zofotokozera.
Tanthauzo la chiŵerengero cha kuyenda kwa madzi C
Popeza sitiroko, kutentha kwa madzi a 5-40 ℃, kusiyana kwa kuthamanga kwa valavu pakati pa malekezero awiri a 1kgf/cm2, kuchuluka kwa kuyenda kudzera mu valavu pa ola limodzi (kofotokozedwa mu m3). C ndiye chiŵerengero cha kuyenda kwa chizolowezi, dziko lathu lakhala likugwiritsidwa ntchito kwa nthawi yayitali, lomwe kale linkadziwika kuti mphamvu yoyendera ya C. Chiŵerengero cha kuyenda kwa C ndiye chiŵerengero cha kuyenda kwa chizolowezi.
② Tanthauzo la chiŵerengero cha kuyenda kwa Kv
Popeza kugunda kwa mpweya, kusiyana kwa kuthamanga kwa mpweya pakati pa malekezero awiri a valavu ndi 102kPa, kutentha kwa madzi ndi 5-40 ℃, kuchuluka kwa madzi omwe akuyenda kudzera mu valavu yowongolera pa ola limodzi (kofotokozedwa mu m3). kv ndi dongosolo lapadziko lonse la mayunitsi oyendera madzi.
③ Tanthauzo la kuchuluka kwa Cv komwe kumayendera
Kuchuluka kwa madzi pa kutentha kwa 60°F komwe kumadutsa mu valavu yowongolera pamphindi (yomwe imafotokozedwa mu magaloni aku US US gal) pa stroke yopatsidwa yokhala ndi kupanikizika kosiyana kwa 1lb/in2 kumapeto onse a valavu. Cv ndiye Imperial flow coefficient.
2, Kutengera ma formula a machitidwe osiyanasiyana a mayunitsi
①Kuchuluka kwa kayendedwe ka madzi C fomula ndi mayunitsi
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:
Pamene γ/γ0=1, Q=1m3/h, △P=1kgf/cm2, ngati C imatanthauzidwa ngati 1, ndiye kuti N=1. Fomula ndi unit ya mphamvu yozungulira C ndi izi:
Mu fomula C ndiye mphamvu yoyendera magazi; Q ndiye m3/h; γ/γ0 ndiye mphamvu yokoka yeniyeni; △P ndiye kgf/cm2.
② Fomula yowerengera Cv yoyezera kuchuluka kwa madzi ndi gawo
Pamene ρ/ρ0=1, Q=1USgal/min, ∆P=1lb/in2, ndipo ngati Cv=1 yafotokozedwa, ndiye kuti N=1. Fomula ndi mayunitsi a flow coefficient Cv ndi awa:
kumene Cv ndiye coefficient yoyendera; Q ili mu USgal/min; ρ/ρ0 ndiye kachulukidwe kake; ndipo ∆P ili mu lb/in2.
③ Fomula yowerengera ya Kv ndi gawo la flow coefficient
Pamene ρ/ρ0=1, Q=1m3/h, ΔP=100kPa, ngati Kv=1, ndiye N=0.1. Fomula ndi unit ya flow coefficient Kv ndi izi:
kumene Kv ndiye chiŵerengero cha kuyenda kwa madzi; Q ili mu m3/h; ρ/ρ0 ndiye kuchuluka kwa madzi komwe kumawerengedwa; ΔP ili mu kPa.
3. Kusintha kwa mphamvu yozungulira C, koyenera yoyenda Kv, koyenera yoyenda Cv
① flow coefficient Cv ndi circulation capacity C ubale
kumene kumadziwika kuti Q ili mu USgal/min; ρ/ρ0 ndiye kuchuluka kwapadera; ndipo ∆P ili mu lb/in2.
Pamene C=1, Q=1m3/h, γ/γ0=1 (monga, ρ/ρ0=1), ndi ∆P=1kgf/cm2, kusintha fomula ya Cv ndi mkhalidwe wa C=1 ndi:
Kuchokera ku mawerengedwe, tikudziwa kuti C=1 ndi Cv=1.167 ndi ofanana (monga, Cv=1.167C).
② Kusintha kwa Cv ndi Kv
Pamene Kv = 1, Q = 1m3 / h, ρ / ρ0 = 1, △ P = 100kPa posintha mawonekedwe a Cv:
Ndiko kuti, Kv = 1 ndi yofanana ndi Cv = 1.156 (mwachitsanzo, Cv = 1.156Kv).
Chifukwa cha chidziwitso ndi zitsanzo zina za mphamvu ya valavu yowongolera C, koyenera yoyenda Kv ndi dongosolo la mayendedwe Cv kusowa kwa njira yochokera, kugwiritsa ntchito kosavuta kupanga chisokonezo. Changhui Instrumentation C, Kv, Cv kuchokera ku tanthauzo, kugwiritsa ntchito unit ndi ubale pakati pa zitatuzi kuti zimveke bwino, kuthandiza opanga mainjiniya mu ndondomeko yowongolera kusankha mavavu ndikuwerengera mawu osiyanasiyana a koyenera yoyenda (C, Kv, Cv) kuti asinthe ndikuyerekeza, kuti athandize kusankha mavavu owongolera kuposa kusankha.
Ma CV a ma valve a gulugufe a Tianjin Zhongfa Valve ndi awa, ngati pakufunika, chonde onani.