Flow Coefficient, Opening and Closure Curves of Full Bore Ball Valves

Flow Coefficient, Opening and Closure Curves of Full Bore Ball Valves

• Flow Coefficient and Flow Factor Values
• Cv & Kv Fraction vs Angle Closure Curve Chart
• Cv vs Angle Closure Curve Tables
• Kv vs Angle Closure Curve Tables
• See Also

Flow Coefficient and Flow Factor Values

The table below list typical maximum flow coefficient, Cv, and flow factor, Kv, values for full bore ball valves:

Nominal Diameter		Max Cv	Max Kv
Inch	mm	gpm.psi	(m³/hr).bar
1″	25	90	78
2″	50	470	407
3″	80	1200	1038
4″	100	2500	2163
6″	150	5600	4844
8″	200	10000	8650
10″	250	16000	13840
12″	300	23000	19895
14″	350	31300	27075
16″	400	41000	35465
18″	450	52000	44980
20″	500	65000	56225
24″	600	94000	81310
26″	650	110000	95150
28″	700	128000	110720
30″	750	147000	127155
32″	800	167000	144455
36″	900	211000	182515
40″	1000	261000	225765
42″	1050	288000	249120
48″	1200	376000	325240

Cv & Kv Fraction vs Angle Closure Curve Chart

This graph shows the Cv or Kv valve fraction vs opening and closing angle of a full bore ball valve:

The full closure curve of a ball valve is then the above graph multiplied by the valve’s flow coefficient or factor.

Cv vs Angle Closure Curve Values Table

The tables below list the full Cv vs angle closure and opening curves for various valve diameters:

 

Full Bore Ball Valve Cv vs Angle for Different Diamters
	1″	2″	3″	4″
0°	0	0	0	0
10°	3	15	39	81
20°	5	27	68	142
30°	9	45	116	242
40°	15	76	193	403
50°	23	118	300	625
60°	35	180	460	958
70°	58	301	768	1600
80°	77	404	1032	2150
90°	90	470	1200	2500
	6″	8″	10″	12″
0°	0	0	0	0
10°	180	322	516	741
20°	317	567	907	1303
30°	541	967	1547	2223
40°	902	1611	2578	3706
50°	1400	2500	4000	5750
60°	2147	3833	6133	8817
70°	3584	6400	10240	14720
80°	4816	8600	13760	19780
90°	5600	10000	16000	23000
	14″	16″	18″	20″
0°	0	0	0	0
10°	1009	1321	1676	2094
20°	1774	2323	2947	3683
30°	3026	3963	5027	6283
40°	5043	6606	8378	10472
50°	7825	10250	13000	16250
60°	11998	15717	19933	24917
70°	20032	26240	33280	41600
80°	26918	35260	44720	55900
90°	31300	41000	52000	65000
	24″	26″	28″	30″
0°	0	0	0	0
10°	3029	3544	4124	4737
20°	5327	6233	7253	8330
30°	9087	10633	12373	14210
40°	15144	17722	20622	23683
50°	23500	27500	32000	36750
60°	36033	42167	49067	56350
70°	60160	70400	81920	94080
80°	80840	94600	110080	126420
90°	94000	110000	128000	147000
	32″	36″	40″	42″
0°	0	0	0	0
10°	5381	6799	8410	9280
20°	9463	11957	14790	16320
30°	16143	20397	25230	27840
40°	26906	33994	42050	46400
50°	41750	52750	65250	72000
60°	64017	80883	100050	110400
70°	106880	135040	167040	184320
80°	143620	181460	224460	247680
90°	167000	211000	261000	288000
	48″
0°	0
10°	12116
20°	21307
30°	36347
40°	60578
50°	94000
60°	144133
70°	240640
80°	323360
90°	376000

 

Kv vs Angle Closure Curve Values Table

The tables below list the full Kv vs angle closure and opening curves for various metric valve diameters:

Ball Valve Kv vs Angle for Different Diameters
(mm)	25	50	75	100
0°	0	0	0	0
10°	3	13	33	70
20°	4	23	59	123
30°	8	39	100	209
40°	13	65	167	348
50°	19	102	260	541
60°	30	156	398	829
70°	50	260	664	1384
80°	67	350	893	1860
90°	78	407	1038	2163
(mm)	150	200	250	300
0°	0	0	0	0
10°	156	279	446	641
20°	274	490	784	1127
30°	468	836	1338	1923
40°	780	1394	2230	3205
50°	1211	2163	3460	4974
60°	1857	3316	5305	7626
70°	3100	5536	8858	12733
80°	4166	7439	11902	17110
90°	4844	8650	13840	19895
(mm)	350	400	450	500
0°	0	0	0	0
10°	872	1143	1449	1812
20°	1534	2010	2549	3186
30°	2617	3428	4348	5435
40°	4362	5714	7247	9058
50°	6769	8866	11245	14056
60°	10379	13595	17242	21553
70°	17328	22698	28787	35984
80°	23284	30500	38683	48354
90°	27075	35465	44980	56225
(mm)	600	650	700	750
0°	0	0	0	0
10°	2620	3066	3568	4097
20°	4608	5392	6274	7205
30°	7860	9198	10703	12292
40°	13100	15330	17838	20486
50°	20328	23788	27680	31789
60°	31169	36474	42443	48743
70°	52038	60896	70861	81379
80°	69927	81829	95219	109353
90°	81310	95150	110720	127155
(mm)	800	900	1000	1050
0°	0	0	0	0
10°	4655	5881	7275	8027
20°	8186	10343	12793	14117
30°	13964	17643	21824	24082
40°	23273	29405	36373	40136
50°	36114	45629	56441	62280
60°	55374	69964	86543	95496
70°	92451	116810	144490	159437
80°	124231	156963	194158	214243
90°	144455	182515	225765	249120
(mm)	1200
0°	0
10°	10480
20°	18430
30°	31440
40°	52400
50°	81310
60°	124675
70°	208154
80°	279706
90°	325240

See Also

• Flow Coefficient, Cv, and Flow Factor, Kv, Converter