Ma coefficients oyendetsa ma valve oyendetsa (Cv, Kv ndi C) a machitidwe osiyanasiyana a unit ndi ma valve olamulira pansi pa kuthamanga kwapadera kosiyana, kuchuluka kwa madzi ozungulira mu nthawi yomwe valve yolamulira imatsegulidwa, Cv, Kv ndi C pali. ubale pakati pa Cv = 1.156Kv, Cv = 1.167C.Nkhaniyi ikugawana tanthawuzo, gawo, kutembenuka ndi kutulutsa kwathunthu kwa Cv, Kv ndi C.
1, Tanthauzo la coefficient yotuluka
Kuwongolera ma valve otaya mphamvu ndi madzi enaake pa kutentha kwapadera, pamene valavu imatha chifukwa cha kuthamanga kwa unit, kuchuluka kwa madzimadzi othamanga kudzera mu valavu yolamulira mu nthawi imodzi, pogwiritsa ntchito njira yosiyana ya mayunitsi pamene pali njira zosiyanasiyana. za mawu.
Tanthauzo la flow coefficient C
Chifukwa cha sitiroko, kutentha kwa 5-40 ℃ madzi, kusiyana kwa valve pakati pa malekezero awiri a 1kgf / cm2, kuchuluka kwa kutuluka kwa valve pa ola limodzi (kufotokozedwa m3) . dziko lathu m'mbuyomu lakhala likugwiritsidwa ntchito kwa nthawi yayitali, lomwe kale limadziwika kuti mphamvu yozungulira ya C. The flow coefficient C ndi coefficient of flow of the common metric.
② Tanthauzo la koyefit yotaya Kv
Chifukwa cha stroke, kusiyana kwapakati pakati pa malekezero awiri a valve ndi 102kPa, kutentha kwa 5-40 ℃ madzi, kuchuluka kwa madzi akuyenda kudzera mu valve yolamulira pa ola limodzi (kufotokozedwa m3).kv ndiye njira yapadziko lonse lapansi ya ma units flow coefficient.
③ Tanthauzo la ma flow coefficient Cv
Kuchuluka kwa madzi pa kutentha kwa 60 ° F komwe kumayenda kudzera mu valve yoyendetsera mphindi imodzi (yofotokozedwa mu US galoni US gal) kwa sitiroko yopatsidwa ndi mphamvu yosiyana ya 1lb / in2 kumapeto kwa valve.Cv ndi mfumu kutuluka kwa coefficient.
2, Kutengera mawonekedwe amitundu yosiyanasiyana yamayunitsi
①Kuchuluka kwa ma circulation C formula 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 akufotokozedwa 1, ndiye N=1.The formula ndi unit of circulation capacity C ndi motere:
Mu chilinganizo C ndi kufalitsidwa mphamvu;Q unit ndi m3/h;γ/γ0 ndi mphamvu yokoka yeniyeni;△P unit ndi kgf/cm2.
② Fomula yowerengera ya Cv ndi gawo
Pamene ρ/ρ0=1, Q=1USgal/mphindi, ∆P=1lb/in2, ndipo ngati Cv=1 afotokozedwa, ndiye N=1.Njira ndi magawo a Cv coefficient yotuluka ndi motere:
pomwe Cv ndiye gawo loyenda;Q ili ku USgal/mphindi;ρ/ρ0 ndiye kachulukidwe kake;ndipo ∆P ili mu lb/in2.
③ Flow coefficient Kv kuwerengera formula ndi unit
Pamene ρ/ρ0=1, Q=1m3/h, ΔP=100kPa, ngati Kv=1, ndiye N=0.1.Njira ndi unit of flow coefficient Kv ndi motere:
kumene Kv ndi gawo loyenda;Q ili mu m3/h;ρ/ρ0 ndiye kachulukidwe kake;ΔP ili mu kPa.
3, Kutembenuka kwa kuchuluka kwa ma circulation C, kutulutsa kokwanira Kv, Cv koyenelera
① Cv yochulukirachulukira komanso kuchuluka kwa ma circulation C ubale
komwe kumadziwika kuti Q ili ku USgal/min;ρ/ρ0 ndiye kachulukidwe kake;ndipo ∆P ili mu lb/in2.
Pamene C=1, Q=1m3/h, γ/γ0=1 (ie, ρ/ρ0=1), ndi ∆P=1kgf/cm2, kulowetsa Cv formula ndi chikhalidwe cha C=1 ndi:
Kuchokera pamawerengedwe, tikudziwa kuti C=1 ndi Cv=1.167 ndizofanana (ie, Cv=1.167C).
② Kusintha kwa Cv ndi Kv
Pamene Kv = 1, Q = 1m3 / h, ρ / ρ0 = 1, △ P = 100kPa m'malo mwa Cv formula yosinthira unit:
Ndiko kuti, Kv = 1 ikufanana ndi Cv = 1.156 (ie, Cv = 1.156Kv).
Chifukwa cha zidziwitso zina ndi zitsanzo za kayendedwe ka valve C, kuthamanga kwa Kv ndi kayendedwe ka kayendedwe ka Cv katatu kusowa kwa njira yotulutsira, kugwiritsa ntchito zosavuta kupanga chisokonezo.Changhui Instrumentation C, Kv, Cv kuchokera ku tanthauzo, kugwiritsa ntchito ma unit ndi ubale pakati pa atatuwa kuti afotokozedwe, kuthandiza opanga mainjiniya pakuwongolera kusankha kwa ma valve ndi kuwerengera mawu osiyanasiyana a ma coefficients otaya (C, Kv, Cv) kwa kutembenuka ndi kuyerekezera, kuti atsogolere kusankha ma valve olamulira kuposa kusankha.
Miyezo ya CV yamavavu agulugufe a Tianjin Zhongfa Valve ndi motere, ngati kuli kofunikira, chonde onani.