Cv valueand flow characteristic of diaphragm valve - Diaphragm Valve

Pneumatic diaphragm valve

CV Value of diaphragm valve
DN（mm）	20		25		32		40		50		65		80
Open	Cv	Kv	Cv	Kv	Cv	Kv	Cv	Kv	Cv	Kv	Cv	Kv	Cv	Kv
100%	6.50	5.59	11.19	9.60	16.70	14.31	31.00	26.57	59.00	50.60	83.00	71.10	148.00	126.90
90%	6.24	5.35	10.75	9.21	16.03	13.74	29.76	25.51	56.00	48.00	79.70	68.30	142.00	121.70
80%	5.98	5.13	10.30	8.83	15.35	13.17	28.51	24.43	54.00	46.29	76.40	65.40	136.00	116.60
70%	5.72	4.90	9.85	8.42	14.69	12.59	27.28	23.38	52.00	44.57	73.00	62.60	130.00	111.40
60%	4.45	4.67	9.40	8.06	14.02	12.02	26.03	22.32	50.00	42.86	69.70	59.80	124.00	106.30
50%	4.54	3.89	7.83	6.71	11.69	10.02	21.69	18.59	41.00	35.14	58.10	49.80	103.00	88.30
40%	3.63	3.11	6.27	5.37	9.35	8.01	17.35	14.87	33.00	28.28	16.50	39.80	82.90	71.00
30%	2.82	2.33	4.70	4.02	7.01	6.01	13.01	11.15	25.00	21.43	34.90	29.90	62.20	44.70
20%	1.81	1.55	3.13	2.68	4.67	4.00	8.67	7.43	16.00	13.71	23.20	19.90	41.40	35.50
10%	0.90	0.70	1.56	1.34	2.33	1.98	4.33	3.71	8.00	6.86	11.60	9.90	80.70	17.80
0%	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00

DN（mm）	100		125		150		200		250		300		350
Open	Cv	Kv	Cv	Kv	Cv	Kv	Cv	Kv	Cv	Kv	Cv	Kv	Cv	Kv
100%	270	231	—	—	505	433	—	—	2100	1800	3880	3326	3880	3326
90%	259	222	—	—	484	414	—	—	2015	1727	2724	3191	3724	3191
80%	248	213	—	—	464	398	—	—	1932	1656	3569	3059	2569	3059
70%	237	103	—	—	444	381	—	—	1848	1584	3414	2926	3414	2926
60%	226	194	—	—	424	363	—	—	1763	1511	3259	2793	3259	2793
50%	189	172	—	—	353	303	—	—	1470	1260	2716	2327	2716	2327
40%	151	129	—	—	282	242	—	—	1176	1008	2172	1861	2172	2961
30%	113	97	—	—	212	282	—	—	881	7555	1629	1396	1629	2396
20%	75.60	65	—	—	141	121	—	—	588	504	1086	931	1086	931
10%	37.80	32.40	—	—	71	61	—	—	294	252	543	465	543	465
0%	0	0	—	—	0	0	—	—	0	0	0	0	0	0

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