밸브_부분3
Post on 17-Oct-2015
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Ball Butterfly Valve Globe Valve
.
Ball Valve (PB)
Globe Valve (PG) .
Valve
Type
Trim
D = d D = 2d
Cd FL XT Fd Fs Kc CD FLP XTP Fs
Single
Port
Globe
On-Off 11 0.9 0.75 1.0 1.05 - 2.8 0.85 0.75 1.04
V-Skirt 9 0.9 0.75 1.5 1.38 - 2.3 0.86 0.75 1.36
Plug 11 0.9 0.72 1.0 1.05 0.65 2.8 0.85 0.73 1.04
11 0.8 0.55 1.0 1.09 0.58 2.8 0.76 0.57 1.08
V-Plug 9.5 0.9 0.75 1.0 1.05 0.80 2.4 0.86 0.75 1.04
Cage 14 0.9 0.75 1.0 1.06 0.65 3.5 0.82 0.75 1.04
16 0.8 0.70 1.0 1.11 - 4.0 0.72 0.71 1.08
Double
Port
Globe
On-Off - 14 0.9 0.75 0.71 0.84 - 3.5 0.82 0.75 0.83
V-Skirt - 13 0.9 0.75 0.71 0.84 - 3.3 0.83 0.75 0.83
D-Plug - 13 0.85 0.70 0.71 0.85 0.70 3.3 0.79 0.71 0.84
V-Plug - 12.5 0.9 0.75 0.71 0.84 0.80 3.1 0.83 0.75 0.84
Angle
Valve
Full Port 20 0.8 0.65 1.0 1.12 0.53 5.0 0.69 0.68 1.08
17 0.9 0.72 1.0 1.08 0.64 4.3 0.78 0.73 1.04
Ventry 22 0.5 0.20 1.0 1.29 0.17 5.5 0.46 0.26 1.26
Ball
Valve
Reduced Bore - 30 0.55 0.15 1.0 1.28 0.25 7.5 0.47 0.24 1.22
V-Notch - 25 0.57 0.25 1.0 1.25 0.22 6.3 0.50 0.33 1.21
But'fly
Valve
Control 60 - 17 0.68 0.38 0.71 0.92 0.30 4.3 0.63 0.43 0.91
On-Off 90 - >3 0.55 0.20 0.71 1.01 - >7.5 0.45 0.33 0.97
Cd : Cv/d2(d: Valve Bore Inch)FL : X : Fd :
Kc : Fs : D : Pipe Sized : Valve Size
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Cavitation
()
. (Pv)
Cavity .
Trim Body .
,
. Cavitation Erosion .
70/ , 1510kHz
. Cavitation
. Cavitation
.
.
.
P1 , , P2
.
. , Kc
, FL .
Flashing
Cavitation
, P2
(Vapor)
Valve Flashing . Cv
Flashing Cavitation .
Redecer ,
Cv Cv
G
(P1 - Pvc)FL
Q.1.167Cv =
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