Ama-coefficient okugeleza kwe-valve yokulawula (i-Cv, i-Kv kanye ne-C) ezinhlelo ezahlukene zamayunithi angama-valve okulawula ngaphansi kwengcindezi ehlukile engaguquki, umthamo wamanzi ojikeleza kuyunithi yesikhathi lapho i-valve yokulawula ivuliwe ngokugcwele, i-Cv, i-Kv kanye ne-C kukhona ubudlelwano phakathi kwe-Cv = 1.156Kv, i-Cv = 1.167C. Lesi sihloko sabelana ngencazelo, iyunithi, ukuguqulwa kanye nenqubo ephelele yokuthola i-Cv, i-Kv kanye ne-C.
1. Incazelo yesilinganiso sokugeleza
Umthamo wokugeleza kwevalvu yokulawula uwuketshezi oluthile ekushiseni okuthile, lapho ivalvu iphela ngenxa yokucindezela okuhlukile kweyunithi, inani lomthamo woketshezi olugeleza ngevalvu yokulawula ngeyunithi yesikhathi, kusetshenziswa uhlelo oluhlukile lwamayunithi lapho kunezindlela ezahlukene zokuveza.
Incazelo ye-coefficient yokugeleza C
Uma sibheka ukushaywa, izinga lokushisa lamanzi angu-5-40 ℃, umehluko wokucindezela kwevalvu phakathi kwezinhlangothi ezimbili ze-1kgf/cm2, umthamo wokugeleza ngevalvu ngehora (ovezwe ku-m3). I-C iyi-coefficient yokugeleza ye-metric evamile, izwe lethu esikhathini esidlule belilokhu lisetshenziswa isikhathi eside, ngaphambili elalaziwa ngokuthi amandla okujikeleza kwe-C. I-coefficient yokugeleza C iyi-coefficient yokugeleza ye-metric evamile.
② Incazelo ye-flow coefficient Kv
Uma kubhekwa ukushaywa, umehluko wokucindezela phakathi kwezinhlangothi ezimbili zevalvu ngu-102kPa, izinga lokushisa lamanzi angu-5-40 ℃, umthamo wamanzi ogeleza ngevalvu yokulawula ngehora (ovezwe ku-m3). I-kv uhlelo lwamazwe ngamazwe lwe-flow coefficient yamayunithi.
③ Incazelo ye-coefficient yokugeleza kwe-Cv
Umthamo wamanzi ekushiseni okungu-60°F ogeleza nge-valve elawulayo ngomzuzu (ovezwa ngama-US gallons US gal) we-stroke ethile enomfutho ohlukile ongu-1lb/in2 ekugcineni ngakunye kwe-valve. I-Cv iyi-imperial flow coefficient.
2, Ukutholwa kwamafomula ezinhlelo ezahlukene zamayunithi
①Umthamo wokujikeleza kwe-C ifomula namayunithi
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:
Uma i-γ/γ0=1, Q=1m3/h, △P=1kgf/cm2, uma i-C ichazwa njengo-1, khona-ke i-N=1. Ifomula kanye neyunithi yomthamo wokujikeleza kwegazi u-C yilena elandelayo:
Kufomula u-C unamandla okujikeleza kwegazi; iyunithi ye-Q ingu-m3/h; u-γ/γ0 unamandla adonsela phansi athile; △ iyunithi ye-P ingu-kgf/cm2.
② Ifomula yokubala i-Cv coefficient yokugeleza kanye neyunithi
Uma u-ρ/ρ0=1, u-Q=1USgal/min, u-∆P=1lb/in2, futhi uma u-Cv=1 echazwa, khona-ke u-N=1. Ifomula namayunithi e-flow coefficient Cv alandelayo:
lapho i-Cv iyi-flow coefficient; i-Q iku-USgal/min; i-ρ/ρ0 iyi-specific density; kanti i-∆P iku-lb/in2.
③ Ifomula yokubala ye-Kv coefficient kanye neyunithi
Uma ρ/ρ0=1, Q=1m3/h, ΔP=100kPa, uma Kv=1, khona-ke N=0.1. Ifomula kanye neyunithi ye-flow coefficient Kv yile elandelayo:
lapho i-Kv iyi-coefficient yokugeleza; i-Q iku-m3/h; i-ρ/ρ0 iyi-density ethile; i-ΔP iku-kPa.
3. Ukuguqulwa komthamo wokujikeleza kwegazi C, i-flow coefficient Kv, i-flow coefficient Cv
① i-coefficient yokugeleza Cv kanye nomthamo wokujikeleza kwegazi C ubudlelwano
lapho kwaziwa khona ukuthi i-Q iku-USgal/min; i-ρ/ρ0 yi-density ethile; kanti i-∆P iku-lb/in2.
Uma u-C=1, u-Q=1m3/h, u-γ/γ0=1 (okungukuthi, u-ρ/ρ0=1), kanye no-∆P=1kgf/cm2, ukufaka ifomula ye-Cv esikhundleni sesimo sika-C=1 kungukuthi:
Kusukela ekubalweni, siyazi ukuthi u-C=1 kanye no-Cv=1.167 zilingana (okungukuthi, u-Cv=1.167C).
② Ukuguqulwa kwe-Cv ne-Kv
Uma i-Kv = 1, Q = 1m3 / h, ρ / ρ0 = 1, △ P = 100kPa esikhundleni sefomula ye-Cv yokuguqulwa kweyunithi:
Okusho ukuthi, i-Kv = 1 ilingana ne-Cv = 1.156 (okungukuthi, i-Cv = 1.156Kv).
Ngenxa yolwazi oluthile kanye namasampula omthamo wokugeleza kwe-valve yokulawula C, i-flow coefficient Kv kanye nesistimu yokugeleza Cv ezintathu ukuntuleka kwenqubo yokuthola, ukusetshenziswa kwe-Changhui Instrumentation C, Kv, Cv kusukela encazelweni, isicelo seyunithi kanye nobudlelwano phakathi kwalokhu okuthathu okuzocaciswa, ukusiza abaklami bobunjiniyela enkambisweni yokulawula ukukhethwa kwe-valve kanye nokubalwa kwezinkulumo ezahlukene ze-flow coefficients (C, Kv, Cv) zokuguqulwa nokuqhathanisa, ukwenza lula ukukhethwa kwama-valve okulawula kunokukhethwa.
Amanani e-CV ama-butterfly valve e-Tianjin Zhongfa Valve alandelayo, uma kudingeka, sicela ubheke.