Bore
(INCHES) |
Classes |
150 |
300 |
600 |
900 |
1500 |
2500 |
2 |
420 |
420 |
400 |
330 |
330 |
250 |
2 1 / 2 |
690 |
690 |
610 |
520 |
510 |
320 |
3 X 2 |
200 |
200 |
200 |
190 |
180 |
200 |
3 |
1200 |
1050 |
1000 |
910 |
820 |
500 |
4 X 3 |
600 |
600 |
600 |
590 |
550 |
560 |
4 |
2200 |
2100 |
1850 |
1800 |
1700 |
1100 |
6 X 4 |
800 |
800 |
790 |
790 |
780 |
745 |
6 |
5150 |
5100 |
4600 |
4380 |
3800 |
2500 |
8 X 6 |
2150 |
2150 |
2150 |
2150 |
2150 |
2150 |
8 |
9500 |
9400 |
9000 |
8500 |
7400 |
5300 |
10 X 8 |
4300 |
4300 |
4450 |
4450 |
4100 |
4100 |
10 |
15000 |
15000 |
14700 |
14500 |
11500 |
8300 |
12 X 10 |
7550 |
7550 |
7550 |
8000 |
9000 |
7550 |
14 X 10 |
6000 |
6000 |
6000 |
6100 |
6100 |
|
12 |
23000 |
23000 |
22500 |
21100 |
18000 |
13000 |
14 X 12 |
14000 |
14000 |
14000 |
12800 |
13000 |
|
16 X 12 |
9100 |
9100 |
9100 |
8900 |
8900 |
|
14 |
28000 |
28000 |
28000 |
25000 |
21000 |
|
16 X 14 |
15000 |
15000 |
15000 |
14200 |
14100 |
|
16 |
37200 |
37200 |
37200 |
34500 |
27500 |
|
18 |
21000 |
21000 |
21000 |
19200 |
19000 |
|
|
|
|
| |
|
|
| |
The coefficient of flow Cv expresses the rate of flow in gallons per minute at 60°F water with a pressure drop of 1 psig across the valve.The Cv coefficients for the various types and sizes shown in the tables, have been determined
from actual flow tests. |
|
| |
|
|
| |
Note: Kv is the metric equivalent of Cv. |
|
| |
|
|
| |
|
|
| |
|
|
| |
 |
|
| |
|
|
| |
 |
|
| |
Where QL = Flow in U.S. gallons per minute.
Δ P = (P1–P2) Pressure drop in psi.
GL = Specific gravity of liquid (water = 1 at 60°F). |
|
| |
|
|
| |
|
|
| |
 |
|
| |
|
|
| |
 |
|
| |
Where Qg = Volumetric flow of gas (SCFH).
Gg = Specific gravity of gas at standard conditions.
(air at atmosphere and 60°F = 1)
T = Absolute temperature of gas
(°F + 460). |
|
| |
|
|
| |
Note: For gas, max. ΔP = 1⁄2 P1, and min.
P2 = 1⁄2 P1, and P1, P2 are absolute pressures (psia) |
|
|
|
