Butterfly Valve Series

• Cast Iron Butterfly Valves
• Ductile Iron Butterfly Valves
• Stainless Steel Butterfly Valves
• Triple Offset Butterfly Valves
• AWWA C504 Butterfly Valves
• Large Diameter Butterfly Valves
• Sanitary Butterfly Valves
• Flanged Butterfly Valves
• Lug Butterfly Valves
• Wafer Butterfly Valves
• High Vacuum Butterfly Valves

Product drawing»

Structural drawing»

Pneumatic Hard-sealed Flange Butterfly Valve

product drawing

Technical performance

D643H pneumatic hard-sealed flange butterfly valve uses three-eccentric sealing structure, seat and disc almost are no wear and tear, with the more closed more tight sealing function. The sealing ring made of stainless steel with dual advantages of metal hard-sealed and flexible sealing. In terms of low temperature and high temperature conditions, the D643H gear hard-sealed flange butterfly valve manufactured by Shanghai Fengqi Industry Development Co.,ltd has excellent sealing performance and long service life. The disc sealing face of D643H pneumatic hard-sealed flange butterfly valve manufactured by Shanghai Fengqi Industry Development Co.,ltd, uses cobalt-based alloy welding. The sealing face is wear resistance and has a long service life.Oversized disc adopts lattice structure, has high strength, over-current area, small flow resistance. The valve also has bi-directional sealing capabilities, it can be installed in any direction without restricted by media flow and affected by position and space.

Dimensions & constructral diagram

The main technical parameters

nominal diameterDN（mm)	50～2000
nominal pressurePN（MPa)	0.6	1.0	1.6	2.5
sealing test(MPa)	0.66	1.1	1.76	2.75
intensity test (MPa)	0.9	1.5	2.4	3.75
suitable temperature	carbon steel：-29℃～425℃stainless steel：-40℃～650℃
applicable medium	water,air,natural gas,oil, and weak corrosive fluid
leakage rate	According with GB/T13927-92 standard
drive mode	worm gear drive,electric,pneumatic,hydraulic

The materials of main parts

part name	materials
body	WCB, alloy steel, stainless steel, QT4500
disc	WCB, alloy steel, stainless steel, QT4500
shaft	2Cr13 stainless steel, alloy steel
seal ring	stainless steel ring
packing	flexible graphite

Standard

manufacture standard	JB/T 8527-97
flange standard	GB9113-2000
face to face dimension standard	GB12221-89
inspection standard	GB/T 13927-92

The main external and connection dimensions of D643H-10/16/25

nominal diameter （DN）(mm)	main dimensions			flange dimensions and bolt specifications
				1.0 MPa			1.6 MPa			2.5 MPa
	L	H1	H	D	D1	n-Фd	D	D1	n-Фd	D	D1	n-Фd
50	108	350	112	165	125	4-18	165	125	4-18	165	125	4-18
65	112	370	115	185	145	4-18	185	145	4-18	185	145	8-18
80	114	380	120	200	160	4-18	200	160	8-18	200	160	8-18
100	127	420	138	220	180	8-18	220	180	8-18	235	190	8-22
125	140	460	164	250	210	8-18	250	210	8-18	270	220	8-26
150	140	555	175	285	240	8-22	285	240	8-22	300	250	8-26
200	152	760	200	340	295	8-22	340	295	12-22	360	310	12-26
250	165	830	243	395	350	12-22	405	355	12-26	425	370	12-30
300	178	895	250	445	400	12-22	460	410	12-26	485	430	16-30
350	190	950	280	505	460	16-22	520	470	16-26	555	490	16-33
400	216	1190	305	565	515	16-26	580	525	16-30	620	550	16-36
450	222	1255	350	615	565	20-26	640	585	20-30	670	600	20-36
500	229	1305	380	670	620	20-26	715	650	20-33	730	660	20-36
600	267	1340	445	780	725	20-30	840	770	20-36	845	770	20-39
700	292	1520	480	895	840	24-30	910	840	24-36	960	875	24-42
800	318	1710	530	1015	950	24-33	1025	950	24-39	1085	990	24-48
900	330	1810	580	1115	1050	28-33	1125	1050	28-39	1185	1090	28-48
1000	410	1960	650	1230	1160	28-36	1255	1170	24-42	1320	1210	28-58
1200	470	2250	760	1455	1380	32-39	1485	1390	32-48	1530	1420	32-56

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