Double Eccentric Sealed Butterfly Valve

• Media: Water,Oil,Gas and Other Non-Causticity Medium
• Driving Mode: Manual
• Seal Form: Supercharging Pressured Sealed
• Work Pressure: Mid-Pressure (2.5mpa< Pn <6.4mpa)
• Working Temperature: Normal Temperature (-40°C<T<120°C)
• Material of Seal Surface: Soft Sealed
• Application: Industrial Usage, Water Industrial Usage
• Service: OEM/ODM
• Transport Package: Poly Bag, Inner Box, Outer Carton /and Pallet
• Trademark: DAISEN

Product Description

Double eccentric sealed butterfly valve

The rotation center of disc (namely the center of valve shaft) and thecenterline ofbody form up a 'b' eccentric on the base of single eccentric butterfly valve. Makingthe sealing face of disc disengaged from seat sealing face more quickly than singleeccentric seal butterfly valves during the process of open and close. Once disc turnsto8° -12°. the disc sealing face will be completely disengaged from the seat sealingface. Once fully opened, a gap 'Y' will be formed up between the two sealing faces.This type of butterfly Valves are designed to have greatly lowered the mechanicalwear and extrusion deformation between the two sealing faces, making the sealingperformance of butterfly valve much better.
The characteristic of this structure is to make stem axis not only deviated from thecenter of disc. But also the center of the body. The effect of double eccentric is that,when valve has been opened, disc can be quickly disengaged from seat, thus togreatly eliminate the unnecessary excessive extrusion and scratch between the discand seat, reduce opening resistance, lower the abrasion and improve the service lifeof seat. As scratch has been greatly lowered, metal seat can be used for double eccentricbutterfly valve, so that butterfly valves are able to be used in high temperature fields.However, as its seal is positioned sealing construction ,i.e. The sealing faces discand seat is lineal contact, disc extruding seat to produce elastic deformation, thusto effect the sealing performance especially seat to produce elastic position, especiallyfor those with metal seat, and is given poor pressure endurance. This is why butterfly valves are, conventionally, not resistant to high temperature and leakage.

 

 

DN	L		H1	H2	H3	A1	A2		0.25MPa		0.6MPa		1.0MPa		1.6MPa
									D1	n-d	D1	n-d	D1	n-d	D1	n-d
50	108	150	82.5	150	66	135	42	150	110	4-φ14	110	4-14	125	4-19	125	4-19
65	112	170	92.5	165	66	135	42	150	130	4- φ 14	130	4-14	145	4-19	145	4-19
80	114	180	100	170	66	135	42	150	150	4- φ 19	150	4-19	160	8-19	160	8-19
10	127	190	125	195	77	135	42	180	170	4- φ 19	170	4-19	180	8-19	180	8-19
125	140	200210	142	220	77	135	42	180	200	8- φ 19	200	8-19	210	8-19	210	8-19
150	140	230	160	250	77	135	42	320	225	8- φ 19	225	8-19	240	8-23	240	8-23
200	152	250	190	275	107	202	60	320	280	8- φ 19	280	8-19	295	8-23	295	12-23
250	165	270	220	305	107	202	60	320	335	12- φ 19	335	12-19	350	12-23	355	12-28
300	178	290	245	350	126	220	93	320	395	12- φ 23	395	12-23	400	12-23	410	12-28
350	190	310	278	385	126	220	93	320	445	12- φ 23	445	12-23	460	16-23	470	16-28
400	216	330	306	435	157	287	123	400	495	16- φ 23	495	16-23	515	16-28	525	16-31
450	222	350	246	490	157	287	123	400	550	16- φ 23	550	16-23	565	20-28	585	20-31
500	229	390	275	505	165	360	184	390	600	20- φ 23	600	20-23	620	20-28	650	20-34
600	267	430	425	605	165	360	184	390	705	20- φ 26	705	20-23	725	20-31	770	20-37
700	292	470	496	675	195	410	204	500	810	24- φ 26	810	24-26	840	24-31	840	24-37
800	318	510	560	740	195	410	204	500	920	24- φ 31	920	24-31	950	24-34	950	24-40
900	330	550	625	805	235	521	217	500	1020	28- φ 31	1020	24-31	1050	28-34	1050	28-40
1000	410	630	680	865	235	521	217	500	1120	32- φ 31	1120	28-31	1160	28-37	1170	28-43
1200	470	710	800	1065	251	501	290	630	1320	36- φ 31	1340	28-31	1380	32-40	1390	32-49
1400	530	790	920	1207	343	656	312	800	1520	40- φ 31	1560	32-34	1590	36-43	1590	36-49
1600	600	870	1030	1317	370	750	414	800	1730	44- φ 31	1760	36-37	1820	40-49	1820	40-56
1800	670	950	1257	1510	470	800	440	900	1930	48- φ 30	1970	40-37	2020	44-48	2020	44-56
2000	760	1000	1408	1600	470	800	440	900	2130	52- φ 33	2180	44-40	2230	48-48	2230	48-62
2200	800	1100	1450	1740	470	800	440	900	2340	52-33	2390	48-43	2440	52-56	2440	52-62
2400	850	1200	1675	1875	480	990	595	1000	2540	56-33	2600	52-43	2650	56-56	2650	56-62
2600	900	1300	1745	2010	480	990	595	1000	2740	60-33	2810	56-43	2850	60-56	2850	60-62
2800	950	1400	1819	2100	480	990	595	1000	2960	64-36	3020	64-48	3070	64-56	3070	64-70
3000	1000		1910	2200	480	990	595	1000	3160	68-36	3220	68-48	3290	68-62	3300	68-70
3200	1100		2050	2450	480	990	595	1000	3360	72-36	3430	72-48	3520	72-62	3530	70-70
3400	1200		2200	2600	490	1045	639	1300	3560	76-36	3640	76-48	3730	76-62	3760	76-70
3600	1200		2350	2800	490	1045	639	1300	3770	80-36	3860	80-56	3950	80-62	4000	80-70
3800	1200		2500	3000	490	1045	639	1300	3970	80-39	4080	80-56	4170	80-62	4240	80-78
4000	1300		2600	3150	490	1045	639	1300	4170	84-39	4300	84-56	4400	84-70	4480	84-78