The laminated elastic butterfly valve seal can withstand high temperatures up to 538℃. It features a sandwich assembly consisting of one to six flexible graphite plates sandwiched between thin stainless steel rings. The flexible graphite sealing rings are not bonded to the stainless steel rings with adhesives, enabling them to endure even higher temperatures.
Fully Sealed Butterfly Valve Worm Gear Actuator
Keywords:
Valve Encyclopedia
Category:
- Product Description
-
Main parts 1
Worm gear
2
Sealing ring
3
Box lid
4
Main position indicator
5
Handle shaft
6
Secondary position indicator
7
Sealing ring
8
Box body
9
Worm gear
Double-acting triple-eccentric hard-sealed butterfly valve
Scope of application
Nominal diameter: DN50~400mm
Nominal pressure: PN 2.5–4.0 MPa
Temperature range: <425℃
Connection methods: Flange-type, lug-type, clamp-type, and butt-welded type.
Applicable media: Fresh water, seawater, sewage, air, steam, food, pharmaceuticals, oils, various types of oil, acids, alkalis, salts, and other mildly corrosive media.
Three-eccentricity principle
· Eccentricity 1: The valve stem is located behind the valve seat axis, enabling the seal to make fully tight contact around the entire valve seat.
· Eccentricity 2: The centerline of the valve stem is offset from the centerlines of both the pipeline and the valve, thereby avoiding interference during valve opening and closing.
· Eccentricity 3: The axis of the valve seat cone is offset from the centerline of the valve stem. This design eliminates friction during both closing and opening operations and ensures a uniform, consistent compression seal around the entire valve seat.
Material of main components
Valve body
Cast steel/stainless steel
Butterfly plate
Cast steel/stainless steel
Valve stem
Cast steel 1 stainless steel
Valve seat
Carbon steel/rubber/stainless steel/PTFE
Drive method
Manual, worm gear, pneumatic, electric
Structural featuresLaminated butterfly valve seal
During the closing phase, the torque generates a seating force that acts uniformly and consistently around the entire circumference. The resilient seal flexes and remains highly responsive, maintaining the valve seat’s shape. The compressive force is evenly distributed along the perimeter, enabling the valve to achieve tight bidirectional closure. The seal’s elasticity allows the valve body and the disc to either make contact or expand freely, thereby eliminating the risk of blockage caused by temperature fluctuations. This design is capable of self-adjusting alignment.
Butterfly valve seal ring
The low-emission valve stem seal has a stem surface finish of 8 RMS, with a packing chamber outer diameter finish of 32 RMS. Dynamic loading capability is available to extend maintenance-free service life. Packing adjustments are easy to perform.
Valve stem blowout protection: Dual valve stem blowout protection, compliant with API609 standard.
Implementation standard
Design and Manufacturing Standards
Flange Connection Standard
Structural length standard
Test and Inspection Standards
JB/T8527
GB/T9124
GB/T12221
GB/T13927
Double-acting triple-eccentric hard-sealed butterfly valve
Connection dimension D343H-10/16C DN50~DN2000mm Unit: mm
DN
L
1.0MPa
1.6MPa
Flange dimensions
External dimensions
Flange dimensions
External dimensions
D
D1
D2
f
b
Z-φd
HO
H
A
B
G
D
D1
D2
f
b
Z-φd
HO
H
A
B
G
50
108
165
125
102
3
18
4-φ18
50
144
180
165
125
165
125
99
3
18
4-φ18
82.5
195
50
144
180
65
112
185
145
122
3
18
8-Φ18
50
144
180
185
145
185
145
118
3
18
8-φ18
92.5
215
50
144
180
80
114
200
160
138
3
20
8-φ18
50
144
180
200
160
138
160
132
3
20
8-φ18
100
215
50
144
180
100
127
220
180
158
3
20
8-φ18
50
144
180
220
180
158
180
156
3
20
8-φ18
110
235
50
144
180
125
140
250
210
188
3
22
8-φ18
63
200
300
250
210
188
210
184
3
22
8-φ18
125
290
63
200
300
150
140
285
240
212
3
22
8-φ22
63
200
300
285
240
212
240
211
3
22
8-φ22
180
310
63
200
300
200
152
340
295
268
3
24
8-φ22
63
200
300
340
295
268
295
266
3
24
12-φ22
202
360
63
200
300
250
165
395
350
320
3
26
12-φ22
80
230
350
405
355
320
355
319
3
26
12-φ26
235
395
80
230
350
300
178
445
400
370
4
26
12-φ22
80
230
350
460
410
378
410
370
4
28
12-φ26
265
425
80
230
350
350
190
505
460
430
4
26
16-φ22
125
260
400
520
470
438
470
429
4
30
16-Φ26
305
475
125
260
400
400
216
565
515
482
4
26
16-φ26
125
260
400
580
525
490
525
480
4
32
16-φ30
335
520
125
260
400
450
222
615
565
532
4
28
20-φ26
125
260
400
640
585
550
585
548
4
40
20-φ30
365
550
125
260
400
500
229
670
620
585
4
28
20-φ26
125
370
400
715
650
610
650
609
4
44
20-φ33
405
610
125
370
400
600
267
780
725
685
5
34
20-φ30
160
398
500
840
770
725
770
720
5
44
20-φ36
445
685
160
398
500
700
292
895
840
800
5
34
24-φ30
160
398
500
910
840
795
840
794
5
46
24-φ36
520
725
200
418
600
800
318
1015
950
905
5
36
24-φ33
200
418
600
1025
950
900
950
901
5
46
24-φ39
605
795
200
418
600
900
330
1115
1050
1005
5
38
28-φ33
200
418
700
1125
1050
1000
1050
1001
5
48
28-φ39
655
885
263
510
700
1000
410
1230
1160
1110
5
38
28-φ36
200
418
700
1255
1170
1115
1170
1112
5
50
28-φ42
715
950
263
510
700
1200
470
1455
1380
1330
5
44
32-φ39
263
510
700
1485
1390
1330
1390
1328
5
52
32-φ48
840
1125
333
550
800
1400
530
1675
1590
1535
5
48
36-φ42
333
550
800
1685
1590
1530
1590
1530
5
58
36-φ48
980
1275
333
550
800
1600
600
1915
1820
1760
5
52
40–φ48
333
550
800
1930
1820
1750
1820
1750
5
64
40-φ56
1125
1470
374
590
900
1800
670
2115
2020
1960
5
56
44-φ48
374
590
900
2130
2020
1950
2020
1950
5
68
44-φ56
1240
1585
374
590
900
2000
760
2325
2230
2170
5
60
48-φ48
374
590
900
2345
2230
2150
2230
2150
5
70
48-φ62
1380
1720
453
635
1000
Note:
1. The data above are standard data; if you have different requirements, we can customize them accordingly.
2. Due to space limitations, not all specifications are listed. For detailed information, please call our company.
3. The actuator can be a worm gear mechanism, a pneumatic device, an electric device, a hydraulically controlled device, and so forth.
Double-acting triple-eccentric hard-sealed butterfly valve
Connection size D343H-25/40C, DN50~DN1600mm Unit: mm
DN
L
2.5MPa
4.0MPa
Flange dimensions
External dimensions
Flange dimensions
External dimensions
D
D1
D2
f
b
Z-φd
Z-W
HO
H
A
B
G
D
D1
D2
f
b
Z-φd
Z-W
HO
H
A
B
G
50
108
165
125
102
3
20
4-φ18
One
82.5
195
50
144
180
165
125
102
3
20
4-φ18
-
82.5
195
50
144
180
65
112
185
145
122
3
22
8-φ18
-
92.5
215
50
144
180
185
145
122
3
22
8-φ18
-
92.5
210
50
144
180
80
114
200
160
138
3
24
8-Φ18
One
100
215
50
144
180
200
160
138
3
24
8-Φ18
One
100
230
50
144
180
100
127
235
190
162
3
24
8-φ22
-
117.5
235
50
144
180
235
190
162
3
24
8-φ22
-
117.5
250
50
144
180
125
140
270
220
188
3
26
8-φ26
-
135
290
63
200
300
270
220
188
3
26
8-φ26
-
135
295
63
200
300
150
140
300
250
218
3
28
8-φ26
-
180
310
63
200
300
300
250
218
3
28
8-φ26
-
215
340
80
230
350
200
152
360
310
278
3
30
8-φ26
4-M24
185
370
80
230
350
375
320
285
3
34
12-φ30
One
220
390
80
230
350
250
165
425
370
335
3
32
8-φ30
4-M27
215
397
80
230
350
450
385
345
3
38
8-Φ33
4-M30
265
485
125
260
400
300
178
485
430
395
4
34
12-φ30
4-M27
250
455
125
260
400
515
450
310
4
42
12-φ33
4-M30
290
490
125
260
400
350
190
555
490
450
4
38
12-φ33
4-M30
285
495
125
260
400
580
510
465
4
46
12-φ36
4-M33
310
540
125
370
400
400
216
620
550
505
4
40
12-φ36
4-M33
330
535
125
370
400
660
585
535
4
50
12-φ39
4-M36
340
620
160
395
500
450
222
670
600
555
4
46
16-φ36
4-M33
345
560
125
370
400
665
610
560
4
57
16-φ39
4-M36
390
645
200
418
600
500
229
730
660
615
4
48
16-φ36
4-M33
390
620
160
398
500
755
670
615
4
57
16-Φ42
4-M39
415
670
200
418
600
600
267
845
770
720
5
58
16-φ39
4-M36
445
685
200
418
600
890
795
735
5
72
16-φ48
4-M45
500
740
200
418
600
700
292
960
875
820
5
50
20-φ42
4-M39
545
750
200
418
600
995
900
840
5
64
20-φ48
4-M45
580
900
263
510
700
800
318
1085
990
930
5
54
20-φ48
4-M45
625
870
263
510
700
1140
1030
960
5
72
20-φ56
4-M52
665
975
333
550
800
900
330
1185
1090
1030
5
58
24-φ48
4-M45
685
965
263
510
700
1250
1140
1070
5
76
24-φ56
4-M52
690
1010
333
550
800
1000
410
1320
1210
1140
5
62
24-φ56
4-M52
755
1040
263
510
700
1360
1250
1180
5
80
24-φ56
4-M52
755
1090
333
550
800
1200
470
1530
1420
1350
5
70
28-φ56
4-M52
860
1180
333
550
800
1575
1460
1380
5
88
28-φ62
4-M56
950
1365
374
590
900
1400
530
1755
1640
1560
5
76
32-φ62
4-M56
1020
1365
374
590
900
1795
1680
1600
5
98
32-φ62
4-M56
1090
1475
453
635
1000
1600
600
1975
1860
1780
5
84
36-φ62
4-M56
1190
1580
374
590
900
Note:
1. The data above are standard data; if you have different requirements, we can customize them accordingly.
2. Due to space limitations, not all specifications are listed. For detailed information, please call our company.
3. The actuator can be a worm gear mechanism, a pneumatic device, an electric device, a hydraulically controlled device, and so forth.
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Next page: Double-acting hard (soft) sealed eccentric flange butterfly valve
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