 |
Apollo® Top Entry Full Port Vavle Flow Coefficients |
| Valve Size |
150
Class Flanged |
300
Class Flanged |
600
Class Flanged |
| 1" |
95 |
90 |
85 |
| 1-1/2" |
230 |
225 |
200 |
| 2" |
435 |
420 |
400 |
| 3" |
1050 |
1000 |
950 |
| 4" |
1950 |
1900 |
1800 |
| 6" |
1800 |
4300 |
4300 |
| 8" |
9100 |
8700 |
8000 |
Apollo® Top Entry Valve Flow Coefficients |
| Valve Size |
150
Class Flanged End |
300
Class Flanged End |
300
Class Buttweld End |
300
Class Socket Weld |
300
Class NPT |
600
Class Flanged End |
600
Class Buttweld End |
| 1/2" |
|
|
|
20 |
20 |
|
|
| 3/4" |
50 |
50 |
50 |
30 |
30 |
50 |
50 |
| 1" |
60 |
60 |
60 |
40 |
40 |
60 |
60 |
| 1-1/2" |
100 |
100 |
100 |
70 |
70 |
100 |
100 |
| 2" |
180 |
180 |
180 |
120 |
120 |
190 |
190 |
| 3" |
330 |
400 |
400 |
260 |
260 |
410 |
410 |
| 4" |
600 |
720 |
720 |
|
|
780 |
780 |
| 6" |
1,500 |
1,500 |
1,500 |
|
|
1,700 |
1,700 |
| 8" |
2,500 |
2,500 |
|
|
|
3,100 |
|
| 10" |
3,800 |
3,800 |
|
|
|
4,900 |
|
| Valve Size |
600
Class Socket Weld |
600
Class RPT |
| 1/2" |
20 |
20 |
| 3/4" |
30 |
30 |
| 1" |
40 |
40 |
| 1-1/2" |
70 |
70 |
| 2" |
120 |
120 |
| 3" |
260 |
260 |
| 4" |
|
|
| 6" |
|
|
| 8" |
|
|
| 10" |
|
|
The table above presents the Flow Coefficients (Cv) for Apollo® Top Entry Ball Valves. This number represents the flow (in gallons per minute of water) required to produce a 1 psig pressure drop across the valve. The data shown is for a valve in the full open position. Data for various degrees of open are available upon request. The values shown represent the average for several tests which highlighted the variability of Flow Coefficients. It is not unreasonable to expect a 10% to 20% deviation for a specific valve from the nominal figures shown.
Knowing specific system characteristics; such as line size, flow rate, temperature and pressure and knowing specific fluid characteristics; such as specific gravity, density, or compressibility factor allows the verification of the pressure drop across a known valve. Or conversely, in the absence of a valve size and knowing an acceptable pressure drop under the described flow conditions it is possible to select an appropriately sized valve
| Flow of Liquids |
or
 |
Where: |
| Q= |
Flow in US GPM |
| PD= |
Pressure Drop (PSI) |
| SG= |
Specific Gravity at Flow Conditions |
| CV= |
Valve Flow Coefficient |
|
| Flow of Gases |
or
 |
Where: |
| Q= |
Flow in US GPM |
| PD= |
Pressure Drop (PSI) |
| P2= |
Outlet Pressure PSIA |
| T= |
Temp. (R°) (F°+460) |
| SG= |
Specific Gravity at Flow Conditions |
| CV= |
Valve Flow Coefficient |
|
|
