Cv-values: M2

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Series	Code	Description
M2	M2	NELES SEAT SUPPORTED VALVE SERIES M2

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IMO

Technical bulletin

The XMBV is an update of the original MBV. XMBV is a seat supported valve, available with variety of metal seat constructions, body extensions, materials and other special features. Small sizes have one-piece body construction while larger sizes have split body construction. Pressure classes ANSI 150 and 300, DIN PN 10...40 are available as flanged versions. Size range is DN 25...200 (1"...8"). Pressure class ANSI 600, DIN PN 63…100 size range is DN25…DN100 (1"…4"). M1/M2 series valves' sizing calculations can be made with this Nelprof™ code as well. M1/M2 size range is DN 25...300 (1"...12").

C_v-values

SIZE			Relative opening h
DN	INCH	RN	10 %	20 %	30 %	40 %	50 %	60 %	70 %	80 %	90 %	100 %
RN = Reduction Number
25	1	0	0.676	1.51	2.81	4.89	7.7	11.5	17	26	46.6	105
40	1.5	0	1.65	3.6	6.75	11.9	18.6	28.4	45.5	75	126	250
50	2	0	2.48	5.4	10.1	17.8	27.9	42.5	70.8	123	224	490
80	3	0	5.94	15.8	29.7	49.5	75.7	109	177	308	560	1160
100	4	0	9.72	25.9	48.6	81	124	179	313	545	989	2200
150	6	0	22.4	59.8	112	187	286	413	757	1318	2394	5100
200	8	0	39.7	106	199	331	506	732	1386	2413	4381	9300
250	10	0	62.8	167	314	523	800	1160	2244	3906	7092	15200
300	12	0	89.9	240	449	749	1150	1660	3306	5757	10452	22400

C_v/d²-values

SIZE			Relative opening h
DN	INCH	RN	10 %	20 %	30 %	40 %	50 %	60 %	70 %	80 %	90 %	100 %
RN = Reduction Number
25	1	0	0.468	0.668	0.782	0.854	0.916	0.954	0.976	0.991	0.998	1
40	1.5	0	0.468	0.668	0.782	0.854	0.916	0.954	0.976	0.991	0.998	1
50	2	0	0.468	0.668	0.782	0.854	0.916	0.954	0.976	0.991	0.998	1
80	3	0	0.475	0.672	0.784	0.855	0.918	0.954	0.977	0.991	0.998	1
100	4	0	0.426	0.656	0.774	0.853	0.907	0.944	0.968	0.982	0.998	1
150	6	0	0.503	0.686	0.794	0.869	0.921	0.956	0.979	0.992	0.998	1
200	8	0	0.54	0.7	0.802	0.874	0.925	0.958	0.98	0.992	0.998	1
250	10	0	0.528	0.694	0.798	0.872	0.923	0.958	0.979	0.992	0.998	1
300	12	0	0.566	0.712	0.809	0.879	0.927	0.96	0.981	0.993	0.998	1

F_L-values

SIZE			Relative opening h
DN	INCH	RN	10 %	20 %	30 %	40 %	50 %	60 %	70 %	80 %	90 %	100 %
RN = Reduction Number
25	1	0	0.91	0.91	0.9	0.88	0.86	0.81	0.77	0.71	0.61	0.43
40	1.5	0	0.91	0.91	0.9	0.88	0.85	0.8	0.74	0.67	0.57	0.41
50	2	0	0.91	0.91	0.9	0.89	0.86	0.82	0.76	0.68	0.57	0.38
80	3	0	0.91	0.91	0.9	0.88	0.85	0.81	0.74	0.67	0.55	0.36
100	4	0	0.91	0.91	0.9	0.88	0.86	0.82	0.75	0.67	0.55	0.33
150	6	0	0.91	0.91	0.9	0.88	0.85	0.81	0.74	0.66	0.54	0.32
200	8	0	0.91	0.91	0.9	0.88	0.85	0.81	0.73	0.65	0.53	0.31
250	10	0	0.91	0.91	0.9	0.88	0.85	0.81	0.73	0.64	0.53	0.29
300	12	0	0.91	0.91	0.9	0.88	0.85	0.81	0.73	0.64	0.52	0.28

X_T-values

SIZE			Relative opening h
DN	INCH	RN	10 %	20 %	30 %	40 %	50 %	60 %	70 %	80 %	90 %	100 %
RN = Reduction Number
25	1	0	0.82	0.82	0.8	0.76	0.69	0.6	0.48	0.37	0.24	0.12
40	1.5	0	0.82	0.82	0.8	0.75	0.67	0.57	0.42	0.3	0.19	0.11
50	2	0	0.82	0.82	0.81	0.77	0.7	0.62	0.47	0.32	0.19	0.1
80	3	0	0.82	0.82	0.79	0.74	0.67	0.58	0.43	0.3	0.18	0.09
100	4	0	0.82	0.82	0.8	0.75	0.68	0.6	0.43	0.3	0.18	0.08
150	6	0	0.82	0.82	0.8	0.75	0.68	0.6	0.41	0.28	0.18	0.07
200	8	0	0.82	0.82	0.8	0.75	0.68	0.6	0.41	0.28	0.17	0.06
250	10	0	0.82	0.82	0.8	0.75	0.68	0.59	0.4	0.27	0.17	0.06
300	12	0	0.82	0.82	0.8	0.75	0.68	0.6	0.39	0.27	0.17	0.05

z-values

SIZE			Relative opening h
DN	INCH	RN	10 %	20 %	30 %	40 %	50 %	60 %	70 %	80 %	90 %	100 %
RN = Reduction Number
25	1	0	0.52	0.51	0.48	0.43	0.37	0.31	0.25	0.19	0.12	0.08
40	1.5	0	0.52	0.51	0.47	0.42	0.36	0.29	0.22	0.16	0.09	0.07
50	2	0	0.52	0.51	0.48	0.44	0.39	0.32	0.24	0.17	0.09	0.07
80	3	0	0.52	0.51	0.46	0.42	0.36	0.3	0.23	0.16	0.09	0.07
100	4	0	0.52	0.51	0.47	0.42	0.37	0.31	0.23	0.16	0.09	0.07
150	6	0	0.52	0.51	0.47	0.42	0.37	0.31	0.22	0.15	0.09	0.06
200	8	0	0.52	0.51	0.47	0.42	0.37	0.31	0.21	0.15	0.09	0.06
250	10	0	0.52	0.51	0.47	0.42	0.37	0.31	0.21	0.14	0.09	0.06
300	12	0	0.52	0.51	0.47	0.42	0.37	0.31	0.21	0.14	0.09	0.06

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File creation day: 22.4.2024 (day.month.year)

Cv-values

Cv/d2-values

FL-values

XT-values

z-values

C_v-values

C_v/d²-values

F_L-values

X_T-values