The size diaphragm of pneumatic flange butterfly valves(PN10).

The size diagram of pneumatic butterfly valves is as follows, for reference only:

DN	In	Pipe diameter	Outside diameter of sealing surface	PN10 flange
DN	In	Pipe diameter	Outside diameter of sealing surface	OD	PCD	Bolts&Length		Thinkness
40	1.5	45	85	150	110	4×M16	130	18
50	2	57	100	165	125	4×M16	130	18
65	2.5	73	120	185	145	4×M16	140	20
80	3	89	135	200	160	8×M16	140	20
100	4	108	155	220	180	8×M16	150	22
125	5	113	185	250	210	8×M16	150	24
150	6	159	210	285	240	8×M20	165	24
200	8	219	265	340	295	8×M20	175	24
250	10	273	320	395	350	12×M20	185	26
300	12	325	375	445	400	12×M20	195	28
350	14	377	435	505	460	16×M20	195	28
400	16	426	485	565	515	16×M24	220	30
450	18	480	545	615	565	20×M24	250	30
500	20	530	608	670	620	20×M24	290	32
600	24	630	718	780	725	20×M27	324	36
700	28	720	788	895	840	24×M27	334	36
800	32	820	898	1015	950	24×M30	364	38
900	36	920	998	1115	1050	28×M30	388	38
1000	40	1020	1110	1230	1160	28×M33	411	38