Straight Through Diaphragm Valves - Flow Coefficients

Flow coefficients - Cv - and flow factors - Kv - for straight through diaphragm valves. Calculate flow coefficients based on valve size and lining type.

Straight Through Diaphragm Valves - Flow Coefficients

Flow coefficients - Cv - and flow factors - Kv - for straight through diaphragm valves of 'Saunders' type.

Flow Characteristics:

Closing a valve to 80% reduces the flow coefficient to approximately 85%
Closing a valve to 50% reduces the flow coefficient to approximately 60%

Calculator

Inputs

Valve Size (DN)

Lining Type

Valve Opening (%) (%)

Results

Flow Coefficient (Cv)--

Flow Factor (Kv)--

Valve Size (DN)	Size (Inches)	Unlined Cv	Unlined Kv	Rubber Lined Cv	Rubber Lined Kv	Glass/Plastic Lined Cv	Glass/Plastic Lined Kv
15	1/2	9	7	-	-	9	8
25	1	38	33	31	26	39	34
32	1 1/4	56	48	46	39	58	50
40	1 1/2	75	65	66	57	79	68
50	2	128	110	107	92	138	119
65	2 1/2	238	205	195	168	254	219
80	3	330	284	264	228	342	295
100	4	588	507	480	414	618	533
125	5	924	797	720	621	960	828
150	6	1680	1448	1260	1086	1800	1552
200	8	2580	2224	2196	1893	2724	2348
250	10	4020	3466	3420	2948	4296	3703
300	12	6060	5224	4884	4210	-	-
350	14	10300	8879	9950	8578	-	-

Straight Through Diaphragm Valves - Flow Coefficients | MEPKit Engineering Tools | MEPKit