Wenzhou Starry Valve Co., Ltd. is one of the most reliable manufacturers and suppliers of lug triple offset butterfly valve in China. We are committed to providing high quality customized valves with low price. If you're going to buy bulk durable lug triple offset butterfly valve, welcome to get quotation from our factory.
| Size Range | NPS 2"~NPS 136" (DN50~DN3400) |
| Rating | Class 150~Class900 (PN10~PN150) |
| Body Material | Carbon Steel, Stainless Steel, Alloy Steel, Duplex stainless steel etc. |
| Disc Sealing | Metal to metal, Graphite Laminated, PTFE |
| Design Standard | API609, EN593 |
| Face to Face Standards | S5155, ISO5752, DIN3352, AWWA C504 and other standards conforming to the requirements |
| Flange Standards | BS4504, ISO2531, ISO7005 and other standards conforming to the requirements |
| End Connection | Lug |
| Operation | Handwheel, Worm Gear, Electric, Pneumatic, Hydraulic |
| Structural Feature | Lug triple offset butterfly valve adopts professional tapped lug connection structure and unique three-eccentric spatial geometric design. It completely eliminates disc-seat friction during full opening and closing strokes, realizing zero-wear operation. The conical metal sealing pair features automatic pressure self-tightening compensation, delivering stable bidirectional zero leakage under fluctuating pressure. Different from wafer and flanged types, the lug structure with integrated tapped bolt holes enables independent single-side installation, blind end isolation and free disassembly without full pipeline separation. Full metal hard-sealing structure resists high temperature, low temperature, high pressure and tiny particle scouring, free from soft seal aging and deformation failure. Compact rigid body ensures excellent structural stability for long-cycle continuous operation. |
| Suitable Media | High-temperature superheated steam, thermal oil, flue gas, compressed air, natural gas, crude oil, industrial slurry with fine particles, cryogenic liquefied gas and weakly corrosive fluid. Widely applied in petrochemical process units, power plant high-pressure steam systems, metallurgical high-temperature pipelines, marine piping, cryogenic energy storage and industrial severe-service pipeline isolation projects. |
Features
Equipped with integral precision tapped lug holes complying with ANSI B16.5 standard. It can be installed and fixed between two pipe flanges without full pipeline disassembly, supporting single-side independent fixation and blind end isolation. Compared with wafer type valves that require full flange clamping, lug type design allows quick valve replacement and pipeline maintenance, greatly improving construction efficiency. It is specially suitable for pipeline sections requiring frequent overhaul, temporary isolation and terminal blind plugging working conditions.
The three-dimensional triple offset design separates the butterfly disc from the sealing seat at the initial opening stage, achieving zero contact and zero friction throughout the entire stroke. No abrasive wear on the metal sealing surface, thoroughly solving the short-service-life defect of traditional soft-seal and double-offset valves. The precision-machined conical sealing pair realizes gradual locking during closing, with uniform stress distribution and strong anti-pressure impact capability.
Adopts all-metal hard sealing configuration with optional Stellite alloy hard surfacing treatment on the seat. With medium pressure increasing, the sealing pair generates automatic self-tightening compensation force, effectively offsetting thermal deformation and mechanical clearance. It achieves API 598 Class VI bidirectional zero leakage, stably maintaining excellent sealing performance under high temperature, high pressure and pressure fluctuation working conditions, far superior to ordinary soft-seal butterfly valves.
Multiple material configurations cover cryogenic (-196℃) to high-temperature (500℃) working conditions. Carbon steel, stainless steel and alloy steel bodies adapt to steam, oil-gas, corrosive and low-temperature liquefied media. The integral rigid lug structure enhances pipeline connection rigidity, resisting thermal expansion and contraction deformation, suitable for harsh and complex industrial continuous operating environments.
Lug structure supports unilateral pressure bearing and terminal isolation, effectively improving pipeline operation safety. The modular internal disc, shaft and sealing components are convenient for inspection and replacement. Zero-wear operation greatly reduces later maintenance frequency and replacement cost, realizing long-term stable maintenance-free operation of industrial pipeline systems.
Typical Application Equipment
- Petrochemical high-temperature process pipeline isolation and flow control systems
- Power plant high-pressure steam, thermal oil and circulating medium pipelines
- Marine engineering, ship piping and offshore platform fluid control systems
- Cryogenic liquefied gas storage and low-temperature transmission pipeline projects
- Metallurgical high-temperature flue gas, industrial gas and particle-containing medium pipelines
- Industrial pipeline terminal blind isolation and frequent maintenance required pipe sections
Working Principle & Application Notes
Lug triple offset butterfly valve relies on worm gear or electric/pneumatic actuator to drive 90° rotation of the butterfly disc. The unique triple offset geometric structure ensures zero-friction operation during opening and closing. When fully closed, the conical metal sealing pair is tightly locked with self-tightening compensation to block medium flow and realize bidirectional zero leakage; when fully opened, the streamlined disc forms a low-resistance straight-through flow channel.Lug type structure is dedicated for flange-clamped installation, supporting unilateral fixation and blind end isolation; not applicable for butt welding connection. Stellite hard surfacing is recommended for particle-containing and high-scouring media; low-temperature working conditions require LCB cryogenic steel configuration. Please confirm ANSI pressure class, material grade and actuation mode before ordering.
Drawings and Main Dimensions
Lug Triple Offset Butterfly Valve Dimensions
|
Main Dimensions per ASME 16.5 |
||||||||||
|
Diameter |
150Lb |
300Lb |
600Lb |
|||||||
|
Inch |
mm |
L1 |
D1 |
Z-Md |
L1 |
D1 |
Z-Md |
L1 |
D1 |
Z-Md |
|
2 |
50 |
43 |
120.7 |
4-Φ19 |
43 |
127 |
4-(M5/8"-UNC11) |
43 |
127 |
4-(M5/8"-UNC11) |
|
2.5 |
65 |
46 |
139.7 |
4-Φ19 |
46 |
149.2 |
4-(M3/4"-UNC10) |
46 |
149.2 |
4-(M3/4"-UNC10) |
|
3 |
80 |
48 |
152.4 |
4-Φ19 |
48 |
168.3 |
4-(M3/4"-UNC10) |
54 |
168.3 |
4-(M3/4"-UNC10) |
|
4 |
100 |
54 |
190.5 |
4-Φ19 |
54 |
200 |
4-(M3/4"-UNC10) |
64 |
215.9 |
4-(M7/8"-UNC9) |
|
5 |
125 |
57 |
215.9 |
4-Φ22 |
59 |
235 |
4-(M3/4"-UNC10) |
78 |
266.7 |
4-(M1"-UN8) |
|
6 |
150 |
57 |
241.3 |
4-Φ22 |
59 |
269.9 |
4-(M3/4"-UNC10) |
78 |
292.1 |
4-(M1"-UN8) |
|
8 |
200 |
64 |
298.5 |
4-Φ22 |
73 |
330.2 |
4-(M7/8"-UNC9) |
102 |
349.2 |
4-(M1⅛"-UN8) |
|
10 |
250 |
71 |
362 |
4-Φ25 |
83 |
387.4 |
4-(M1"-UN8) |
117 |
431.8 |
4-(M1¼"-UN8) |
|
12 |
300 |
81 |
431.8 |
4-Φ25 |
92 |
450.8 |
4-(M1⅛"-UN8) |
140 |
489 |
4-(M1¼"-UN8) |
|
14 |
350 |
92 |
476.3 |
4-Φ29 |
117 |
514.4 |
4-(M1⅛"-UN8) |
155 |
527 |
4-(M1⅜"-UN8) |
|
16 |
400 |
102 |
539.8 |
4-(M1"-UN8) |
133 |
571.5 |
4-(M1¼"-UN8) |
178 |
603.2 |
4-(M1½"-UN8) |
|
18 |
450 |
114 |
577.9 |
4-(M1⅛"-UN8) |
149 |
628.6 |
4-(M1¼"-UN8) |
200 |
654 |
4-(M1⅝"-UN8) |
|
20 |
500 |
127 |
635 |
4-(M1⅛"-UN8) |
159 |
685.8 |
4-(M1¼"-UN8) |
216 |
723.9 |
4-(M1⅝"-UN8) |
|
24 |
600 |
154 |
749.3 |
4-(M1¼"-UN8) |
181 |
812.8 |
4-(M1½"-UN8) |
232 |
838.2 |
4-(M1⅞"-UN8) |
|
Main Dimensions per ASME B16.47 Series A |
||||||||||
|
Diameter |
150Lb |
300Lb |
600Lb |
|||||||
|
Inch |
mm |
L1 |
D1 |
Z-Md |
L1 |
D1 |
Z-Md |
L1 |
D1 |
Z-Md |
|
26 |
650 |
165 |
806.4 |
4-(M1¼"-UN8) |
229 |
876.3 |
4-(M1⅝"-UN8) |
229 |
914.4 |
8-(M1¼"-UN8) |
|
28 |
700 |
165 |
863.6 |
4-(M1¼"-UN8) |
229 |
939.8 |
4-(M1⅝"-UN8) |
229 |
965.2 |
8-(M2"-UN8) |
|
30 |
750 |
190 |
914.4 |
4-(M1¼"-UN8) |
241 |
997 |
4-(M1¾"-UN8) |
241 |
1022.4 |
8-(M2"-UN8) |
|
32 |
800 |
190 |
977.9 |
4-(M1½"-UN8) |
241 |
1054.1 |
4-(M1⅞"-UN8) |
241 |
1079.5 |
8-(M2¼"-UN8) |
|
36 |
900 |
203 |
1085.8 |
4-(M1½"-UN8) |
241 |
1168.4 |
8-(M2"-UN8) |
241 |
1193.8 |
8-(M2½"-UN8) |
|
40 |
1000 |
216 |
1200.2 |
4-(M1½"-UN8) |
330 |
1155.7 |
8-(M1⅞"-UN8) |
330 |
1212.8 |
8-(M2¼"-UN8) |
|
44 |
1100 |
254 |
1314.4 |
4-(M1½"-UN8) |
360 |
1263.6 |
8-(M1¾"-UN8) |
360 |
1333.5 |
8-(M2½"-UN8) |
|
48 |
1200 |
254 |
1422.4 |
4-(M1½"-UN8) |
360 |
1371.6 |
8-(M1⅞"-UN8) |
360 |
1460.5 |
8-(M2¾"-UN8) |
|
52 |
1300 |
279 |
1536.7 |
4-(M1¾"-UN8) |
390 |
1479.6 |
8-(M2"-UN8) |
390 |
1574.8 |
8-(M3"-UN8) |
|
56 |
1400 |
279 |
1651 |
4-(M1¾"-UN8) |
390 |
1600.2 |
8-(M1¼"-UN8) |
390 |
1695.4 |
8-(M3¼"-UN8) |
|
60 |
1500 |
318 |
1759 |
4-(M1¾"-UN8) |
440 |
1701.8 |
8-(M1⅞"-UN8) |
440 |
1822.4 |
8-(M3½"-UN8) |
|
Main Dimensions per ASME B16.47 Series B |
||||||||||
|
Diameter |
150Lb |
300Lb |
600Lb |
|||||||
|
Inch |
mm |
L1 |
D1 |
Z-Md |
L1 |
D1 |
Z-Md |
L1 |
D1 |
Z-Md |
|
26 |
650 |
165 |
744.5 |
4-(M3/4"-UNC10) |
229 |
803.3 |
8-(M1¼"-UN8) |
229 |
806.4 |
8-(M1⅜"-UN8) |
|
28 |
700 |
165 |
795.3 |
4-(M3/4"-UNC10) |
229 |
857.2 |
8-(M1¼"-UN8) |
229 |
863.6 |
8-(M1⅜"-UN8) |
|
30 |
750 |
190 |
846.1 |
4-(M3/4"-UNC10) |
241 |
920.8 |
8-(M1⅜"-UN8) |
241 |
927.1 |
8-(M1⅞"-UN8) |
|
32 |
800 |
190 |
900.1 |
8-(M3/4"-UNC10) |
241 |
977.9 |
8-(M1½"-UN8) |
241 |
984.2 |
8-(M2"-UN8) |
|
36 |
900 |
203 |
1009.6 |
8-(M7/8"-UNC9) |
241 |
1089 |
8-(M1⅝"-UN8) |
241 |
1104.9 |
8-(M2¼"-UN8) |
|
40 |
1000 |
216 |
1120.8 |
8-(M1"-UN8) |
330 |
1190.6 |
8-(M1⅝"-UN8) |
|
|
|
|
44 |
1100 |
254 |
1222.4 |
8-(M1"-UN8) |
360 |
1295.4 |
8-(M1¾"-UN8) |
|
|
|
|
48 |
1200 |
254 |
1335.1 |
8-(M1⅛"-UN8) |
360 |
1416 |
8-(M1⅞"-UN8) |
|
|
|
|
52 |
1300 |
279 |
1436.7 |
8-(M1⅛"-UN8) |
390 |
1517.6 |
8-(M1⅞"-UN8) |
|
|
|
|
56 |
1400 |
279 |
1543 |
8-(M1⅜"-UN8) |
390 |
1651 |
8-(M2¼"-UN8) |
|
|
|
|
60 |
1500 |
318 |
1662.1 |
8-(M1⅜"-UN8) |
440 |
1763.7 |
8-(M2¼"-UN8) |
|
|
|
Hot Tags: lug triple offset butterfly valve, China lug triple offset butterfly valve manufacturers, suppliers, factory
