Flow Coefficients - Cv - and Flow Factors - Kv - of Weir Diaphragm Valves

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Engineering ToolBox > Flow Coefficients - Cv - and Flow Factors - Kv - of Weir Diaphragm Valves

Typical flow coefficients - C_v - and flow factors - K_v - of weir diaphragm valves of "Saunders" type

The table below indicates typical flow coefficients - C_v - and flow factors - K_v - for weir diaphragm flanged cast iron valves of "Saunders" type.

Valve Size		Unlined		Rubber Lined		Halar/Glass Lined		Plastic Lined
DN	Inches	C_v	K_v	C_v	K_v	C_v	K_v	C_v	K_v
15		6	5			6	5
20		12	10	9	8	12	10	7	6
25	1	18	15	14	12	18	16	11	10
32	1	28	24	22	19	28	24	17	14
40	1	43	37	35	30	45	39	31	27
50	2	80	69	64	55	88	76	59	51
65	2	127	109	102	88	132	114	83	72
80	3	185	159	148	128	186	160	148	128
100	4	315	272	252	217	336	290	270	233
125	5	420	362	363	313	440	379
150	6	605	522	484	417	630	543	505	435
200	8	1 300	1 121	1 309	1 128	1 320	1 138
225	9	1 630	1 405	1 320	1 138	1 680	1 448
250	10	1 980	1 707	2 000	1 724	2 100	1 810
300	12	2 550	2 198	2 600	2 241	2 700	2 328
350	14	3 700	3 190	3 750	3 233	3 880	3 345

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