Flowjetvalve

CV FLOW COEFFICIENTS

Bore (INCHES) Classes
150 300 600 900 1500 2500
2420420400330330250
2 1 / 2690690610520510320
3 X 2200200200190180200
3120010501000910820500
4 X 3600600600590550560
4220021001850180017001100
6 X 4800800790790780745
6515051004600438038002500
8 X 6215021502150215021502150
8950094009000850074005300
10 X 8430043004450445041004100
1015000150001470014500115008300
12 X 10755075507550800090007550
14 X 1060006000600061006100
12230002300022500211001800013000
14 X 121400014000140001280013000
16 X 1291009100910089008900
142800028000280002500021000
16 X 141500015000150001420014100
163720037200372003450027500
182100021000210001920019000

Data for Calculation of Flow

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.
KV = CV x 0.85

For Liquids:

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).

For Gases:

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)

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