Sizing - Pietro Fiorentini
Sizing - Pietro Fiorentini Sizing - Pietro Fiorentini
Cg and Kg valve coefficient LIQUIDS Glossary A. Subcritical conditions (when ΔP < F 2 ΔPc) Volume flow rate Cv ΔP Qf = 1.17 Gf Weight flow rate W = 855 Cv GfΔP Note: For values of ΔP ≥ ΔPk the valve works under cavitation conditions. Deltaflux Cv = valve flow rate coefficient: US gpm of water with ∆P = 1 psi ΔP = valve pressure drop P1-P2: bar ΔPc = maximum dimensioning differential pressure: bar ΔPk = cavitation differential pressure: bar Δt = overheating temperature delta t1 - ts: °C F = valve recovery factor: non dimensional G = gas relative density (air=1): non dimensional Gf = liquid relative density at operating temperature (water at 15°C=1) Kc = valve incipient cavitation factor: non dimensional Xg = weight percentage of gas or vapor in the mixture at upstream pressure: % P1 = valve upstream pressure: bar abs P2 = valve downstream pressure: bar abs Pc Pk Pv T t1 ts Q Qf W W1 W2 Vf Vg1 Vg2 B. Critical conditions (when ΔP ≥ F 2 ΔPc) Volume flow rate F Cv ΔPc Qf = 1.17 Gf Weight flow rate W = 855 F Cv Gf Δ Pc ΔPc = P1-Pc Pc = Pv (0,96-0,28 Pv Pk ΔPk = Kc (P1-Pv) = vena contracta critical pressure: bar abs = thermodynamic critical point pressure: bar abs = vapor pressure at operating temperature: bar abs = upstream gas absolute temperature (273+°C): °K = overheated steam upstream temperature: °C = saturated steam temperature at upstream pressure: °C = volume flow rate at 15 °C and 1.013 bar abs: Sm3/h = volume flow rate: m3/h = weight flow rate: Kg/h = upstream mixture density: kg/m3 = downstream mixture density: kg/m3 = specific volume of liquid: m3/kg = specific volume of gas or vapor at upstream pressure: m3/kg = specific volume of gas or vapor at downstream pressure: m3/kg )
Cv coefficient Deltaflux Dn 2" 3" 4" 6" 8" 10" 12" 14" 16" 18" 20" 24" Deltaflux Dn 2" 3" 4" 6" 8" 10" 12" 14" 16" 18" 20" 24" Cv coefficient at 100% opening 82 215 405 1080 1750 2860 3980 5000 6800 8400 10600 16100 Cv coefficient at 100% opening 60 150 290 650 1225 1975 2825 3475 4675 5950 7500 11100 Liquid control application Liquid trim Gas control application Gas trim Deltaflux Note: To verify the dimensioning and, in detail, for the dimensioning of Deltaflux control valves bigger than 24”, always refer to Pietro Fiorentini S.p.A.
- Page 1 and 2: Sizing Pressure Regulators & Contro
- Page 3 and 4: The above formulae are applicable t
- Page 5 and 6: Dixi AP Nominal diameter (mm) Size
- Page 7 and 8: Dival 600 Nominal diameter (mm) Siz
- Page 9: Sizing the Control Valve A. Subcrit
- Page 13 and 14: SBC 782 Nominal diameter (mm) Size
- Page 15 and 16: PVS 782 Nominal diameter (mm) Size
Cv coefficient<br />
Deltaflux<br />
Dn<br />
2"<br />
3"<br />
4"<br />
6"<br />
8"<br />
10"<br />
12"<br />
14"<br />
16"<br />
18"<br />
20"<br />
24"<br />
Deltaflux<br />
Dn<br />
2"<br />
3"<br />
4"<br />
6"<br />
8"<br />
10"<br />
12"<br />
14"<br />
16"<br />
18"<br />
20"<br />
24"<br />
Cv coefficient<br />
at 100% opening<br />
82<br />
215<br />
405<br />
1080<br />
1750<br />
2860<br />
3980<br />
5000<br />
6800<br />
8400<br />
10600<br />
16100<br />
Cv coefficient<br />
at 100% opening<br />
60<br />
150<br />
290<br />
650<br />
1225<br />
1975<br />
2825<br />
3475<br />
4675<br />
5950<br />
7500<br />
11100<br />
Liquid control application<br />
Liquid trim<br />
Gas control application<br />
Gas trim<br />
Deltaflux<br />
Note: To verify the dimensioning and, in detail, for the dimensioning of Deltaflux control<br />
valves bigger than 24”, always refer to <strong>Pietro</strong> <strong>Fiorentini</strong> S.p.A.
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