Product Overview
Double eccentric butterfly valve, also known as high-performance butterfly valve, is a new generation of gas butterfly valve developed and designed on the basis of absorbing advanced technology at home and abroad. The valve shaft adopts double eccentric structure, which has the sealing function of tightening the more close, the sealing is reliable, the sealing ring is installed on the butterfly plate, the sealing interference can be adjusted, effectively ensuring the sealing interference, and the sealing ring can be replaced without disassembly. It is widely used in metallurgy, building materials, chemical and other industries to regulate and throttle gas, combustible gas and other gas media.
How it works
The double eccentric butterfly valve is further improved on the basis of the single eccentric butterfly valve. Its structure is characterized by a deviation from both the center of the butterfly plate and the center of the body at the stem axis. The effect of double eccentricity makes the butterfly plate quickly detach from the valve seat after the valve is opened, which greatly eliminates the unnecessary excessive extrusion and scratching phenomenon between the butterfly plate and the valve seat, reduces the opening resistance, reduces wear and improves the life of the valve seat. The significant reduction of scratching also makes the double eccentric butterfly valve also available with metal seats, which improves the application of butterfly valves in high-temperature fields.
Features:
1. Reasonable design, compact structure, easy to assemble and disassemble, easy to maintain.
2. Adopt eccentric structure to reduce the friction of the sealing ring and prolong the service life of the valve.
3 Completely sealed with zero leakage. Can be used in ultra-high vacuum applications.
4. Replace the valve plate sealing ring, butterfly plate, rotating shaft and other materials, which can be applied to a variety of media and different temperatures.
Main technical parameters:
|
Nominal diameter |
40mm~1200mm |
|
|
Flange standard |
ISO7005-2 1988 |
|
|
Maximum operating pressure |
1.6MPa |
|
|
Housing test pressure |
1.5 times the working pressure |
|
|
Seal test pressure |
1.1 times the working pressure |
|
|
Operating temperature range |
NBR seat -10°C~80 °C, EPDM seat -20°C~120°C |
|
|
Allowable temperature for long-term use |
NBR seat 0°C~60 °C, EPDM seat 0°C~100°C |
|
|
material |
(See Table of Optional Materials) |
|
|
Structural dimensions |
ISO5752-88 |
|
|
Drive type |
handle |
50mm~300mm |
|
worm wheel |
50mm~1200mm |
|
|
Pneumatic |
50mm~1200mm |
|
|
electric |
50mm~1200mm |
|
|
Surface treatment |
Epoxy polyester coating, nylon 11, baking paint |
|
Standard Specifications
|
The name of the item |
Adopt standards |
Optional criteria |
|
Design, manufacturing and acceptance |
GB/T12238-1989 |
ISO/DIN10631-91 |
|
Valve structure length |
GB/T12221-1989 |
ISO5752-88 |
|
Valve flange connection |
GB9113-1988 |
ISO7005. 2 |
|
Valve inspection |
GB/T13927-1992 |
ISO/DIN5208-87 |
|
Valve marking |
GB12220-1989 |
ISO5209-87 |
|
The drive is connected |
GB12223-1989 |
ISO/DIN5211-89 |
|
Valve supply requirements |
GB/T12252 |
———— |
Note: Butterfly valves not only comply with ISO, GB standards, but also are compatible with other national standards in the world.
Sealing pair suitable medium
Temperature Recommendation Table: A Very Applicable B Applicable C Limited Applicable D Not Applicable
|
Sealing pair material |
Applicable temperature |
The type of media and the degree of suitability |
Outstanding features |
|||||||||||||
|
fresh water |
Sea water |
Salts |
Strong alkali |
Weak alkali |
Strong acid |
Weak acid |
Nature |
Alcohols |
Air |
Steam |
Oils |
Food |
||||
|
Seat |
Nitrile |
-12℃~82℃ |
A |
A |
A |
B |
A |
D |
B |
A |
C |
A |
D |
A |
B |
Oil-resistant |
|
Triethylene propylene (EPD). |
-35℃~135℃ |
A |
A |
A |
A |
A |
C |
A |
B |
B |
A |
A |
C |
A |
Resistant to aging |
|
|
Corrosion-resistant EPDM |
-35℃~160℃ |
A |
A |
A |
A |
A |
A |
A |
B |
B |
A |
A |
C |
A |
Corrosion resistance, aging resistance |
|
|
Viton |
-23℃~135℃ |
A |
A |
A |
A |
A |
C |
A |
A |
C |
A |
A |
A |
A |
High temperature resistance, corrosion resistance |
|
|
polytetrafluoroethylene |
-10℃~150℃ |
A |
A |
A |
C |
A |
A |
A |
A |
A |
A |
A |
A |
A |
Corrosion-resistant, high-temperature resistant |
|
|
Butterfly plates |
Ductile iron plating |
-30℃~350℃ |
B |
D |
C |
D |
C |
D |
C |
B |
A |
B |
A |
A |
C |
heat resisting |
|
Ductile iron nylon cladding |
-30℃~100℃ |
A |
A |
A |
A |
A |
D |
A |
A |
C |
A |
D |
A |
A |
Corrosion resistance, wear resistance |
|
|
Aluminium bronze |
-273℃~232℃ |
A |
B |
C |
D |
C |
D |
B |
A |
A |
A |
A |
A |
C |
Heat-resistant and corrosion-resistant |
|
|
stainless steel |
-268℃~316℃ |
A |
B |
C |
C |
B |
C |
A |
A |
A |
A |
A |
A |
A |
High temperature resistance, corrosion resistance |
|
Connection Size (mm)
|
Called the diameter |
The length of the structure |
Dimensions |
Connection size (Typical) |
|||||||||
|
0.6MPa |
1.0MPa |
1.6MPa |
||||||||||
|
millimetre |
inch |
L |
H |
H0 |
A |
B |
D0 |
n-d |
D0 |
n-d |
D0 |
n-d |
|
50 |
2 |
43 |
63 |
315 |
180 |
65 |
110 |
4-14 |
125 |
4-18 |
125 |
4-18 |
|
65 |
21/2 |
46 |
70 |
330 |
180 |
65 |
130 |
4-14 |
145 |
4-18 |
145 |
4-18 |
|
80 |
3 |
46 |
83 |
390 |
245 |
72 |
150 |
4-18 |
160 |
8-18 |
160 |
8-18 |
|
100 |
4 |
52 |
105 |
431 |
240 |
72 |
170 |
4-18 |
180 |
8-18 |
180 |
8-18 |
|
125 |
5 |
56 |
115 |
455 |
240 |
72 |
200 |
8-18 |
210 |
8-18 |
210 |
8-18 |
|
150 |
6 |
56 |
137 |
626 |
350 |
93 |
225 |
8-18 |
240 |
8-22 |
240 |
8-22 |
|
200 |
8 |
60 |
164 |
720 |
350 |
93 |
280 |
8-18 |
295 |
8-22 |
295 |
12-22 |
|
250 |
10 |
68 |
206 |
800 |
550 |
350 |
335 |
12-18 |
350 |
12-22 |
355 |
12-26 |
|
300 |
12 |
78 |
230 |
860 |
600 |
350 |
395 |
12-22 |
400 |
12-22 |
410 |
12-26 |
|
350 |
14 |
78 |
248 |
883 |
600 |
350 |
445 |
12-22 |
460 |
16-22 |
470 |
16-26 |
|
400 |
16 |
102 |
289 |
972 |
600 |
350 |
495 |
16-22 |
515 |
16-26 |
525 |
16-30 |
|
450 |
18 |
114 |
320 |
1043 |
750 |
380 |
550 |
16-22 |
565 |
20-26 |
585 |
20-30 |
|
500 |
20 |
127 |
343 |
1098 |
750 |
380 |
600 |
20-22 |
620 |
20-26 |
650 |
20-33 |
|
600 |
24 |
154 |
413 |
1236 |
750 |
380 |
705 |
20-26 |
725 |
20-30 |
770 |
20-36 |
|
700 |
28 |
165 |
478 |
1431 |
750 |
380 |
810 |
24-26 |
840 |
24-30 |
840 |
24-36 |
|
800 |
32 |
190 |
525 |
1488 |
750 |
380 |
920 |
24-30 |
950 |
24-33 |
950 |
24-39 |
|
900 |
36 |
203 |
620 |
1615 |
1250 |
380 |
1020 |
24-30 |
1050 |
28-33 |
1050 |
28-39 |
|
1000 |
40 |
216 |
725 |
1765 |
1500 |
580 |
1120 |
28-30 |
1160 |
28-36 |
1170 |
28-42 |
|
1200 |
48 |
254 |
780 |
1976 |
1500 |
580 |
1340 |
32-33 |
1380 |
32-39 |
1390 |
32-48 |
