Ball Valves and typical Flow Coefficients - C_v

Typical flow coefficients - C_v - for ball valves - reduced and full bore

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Conventional ball valves are normally not used as throttling valves since partial flow will create high velocity flow tear at the ball and seals.

Full Bore Valves

Typical flow coefficients - C_v - for full bore valves:

Valve Size
inches	1/2	3/4	1	1 1/2	2	2 1/2	3	4	6	8	10	12	14	16	18
mm	12	19	25	37.5	50	62.5	75	100	150	200	250	300	350	400	450
Flow Coefficient C_v	26	50	94	260	480	750	1300	2300	5400	10000	16000	24000	31400	43000	57000

Reduced Bore Valves

Typical flow coefficients - C_v - for reduced bore valves:

Valve Size
inches	3	4	6	8	10	12	14	16	18	20
mm	75	100	150	200	250	300	350	400	450	500
Flow Coefficient C_v	420	770	1800	2500	4500	8000	12000	14000	18000	22000

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Related Topics

Piping Systems Dimensions of pipes and tubes - dimensions, materials, capacities - pressure drop calculations and charts - insulation and heat loss diagrams

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