Pressure & Temperature Ratings of Lug Butterfly Valve
Our heavy-duty lug butterfly valve series are engineered to perform stably under diversified pressure and temperature working conditions, fully complying with global industrial standards including PN10, PN16 and ANSI Class 150 pressure grades. The actual service temperature range of each lug type butterfly valve depends entirely on the selected seat material, which is the core component that determines long-term sealing reliability of industrial lug butterfly valves.
| Seat Material |
Temperature Range |
Best Suitable Media & Application |
| EPDM |
-35℃ ~ +130℃ |
Drinking water, seawater, steam, diluted acid; municipal water & wastewater lug butterfly valve |
| NBR (BUNA-N) |
-25℃ ~ +100℃ |
Oils, hydrocarbons, fuel gas, general water; oilfield & HVAC lug butterfly valve |
| FKM / Viton |
-20℃ ~ +200℃ |
High-temperature oil, strong acid, chemical solvent; chemical plant high temp lug butterfly valve |
| PTFE |
-60℃ ~ +180℃ |
Highly corrosive acid & alkali, pharmaceutical fluid; corrosion resistant lug butterfly valve |
| Silicone / MVQ |
-60℃ ~ +190℃ |
Pure water, beverage, food-grade fluid; food & beverage lug butterfly valve |
| CR Neoprene |
-20℃ ~ +100℃ |
Alkali, alcohol, weak hydrocarbon; general industrial lug butterfly valve |
Selecting the matched seat material for your lug style butterfly valve is critical to achieve bubble-tight zero leakage and extend the whole valve service life. Wrong seat selection will lead to early aging, seat cracking and medium leakage, which will increase pipeline maintenance cost and production downtime.
Industry Applications for Lug Butterfly Valve
Laux industrial lug butterfly valve is widely adopted in global pipeline systems that demand reliable isolation control, low maintenance cost and long-lasting durability. Our lug butterfly valves support bidirectional bubble tight shut-off and dead-end service, perfectly matching fluid control demands across dozens of mainstream industrial sectors.
Water Treatment
Full range lug butterfly valve for raw water filtration, wastewater discharge, desalination plant and pure water circulation system, stable sealing for long-time continuous running.
Municipal Water Supply
Standard PN10 / PN16 lug butterfly valve for urban water distribution network, water pump station and underground municipal pipeline infrastructure.
HVAC Systems
Lightweight lug butterfly valve for chilled water, cooling circulation and heating pipeline in commercial malls, factories and office buildings, low operating torque for easy actuation.
Chemical Processing
Corrosion resistant stainless steel & PTFE lined lug butterfly valve for acid, alkali and various chemical process medium, compatible with complex corrosive working conditions.
Fire Protection
UL & standard fire service lug butterfly valve for fire sprinkler pipeline, fire water tank isolation, fast 90-degree on-off response for emergency fire control.
Marine & Shipbuilding
Aluminum bronze & EPDM lug butterfly valve with superior seawater anti-corrosion, applied to ship ballast system, offshore platform cooling pipeline.
Mining Industry
Heavy-duty ductile iron lug butterfly valve for mineral slurry, abrasive medium transport, wear resistant body & seat for harsh mining environment.
Oil & Gas / Refinery
FKM seat high pressure lug butterfly valve for crude oil, refined petroleum and gas pipeline, high strength body for refinery process control.
Food & Beverage
Food grade silicone seat lug butterfly valve for wine, beer, beverage and food processing pipelines, clean non-toxic sealing structure.
Why Choose Lug Butterfly Valve Over Other Isolation Valves
Compared with gate valve, globe valve and wafer butterfly valve, industrial lug butterfly valve owns unique structural advantages that make it the top choice for end-of-line service and high-maintenance frequency pipeline projects:
- Unique threaded lug body design allows independent flange connection on single side, no need to remove the whole pipeline for valve maintenance or replacement
- Much lighter and more compact structure than gate valve, greatly reducing overall pipeline installation cost and space occupation
- Low operating torque design, compatible with manual, pneumatic and electric actuators via standard ISO5211 top flange
- Supports dead-end shut-off service, suitable for pipeline terminal isolation that wafer butterfly valve cannot support
- 90-degree quick open & close operation, fast flow cut-off and accurate linear flow regulation performance
- Long service life with tens of thousands of open-close cycles, lower long-term maintenance expense for factories
For pipeline projects that require frequent equipment overhaul, terminal cut-off and limited installation space, lug butterfly valve is the most efficient and cost-effective flow control solution among all industrial isolation valves.
Lug Butterfly Valve VS Wafer Butterfly Valve
Although lug butterfly valve and wafer butterfly valve share similar working principle and concentric disc sealing structure, their installation mode, applicable scenarios and structural features have obvious differences. Choose the correct valve type according to your pipeline layout and maintenance demand:
| Comparison Item |
Lug Butterfly Valve |
Wafer Butterfly Valve |
| Body Structure |
Integrated threaded lugs around valve body |
Smooth body without threaded lugs, fixed by full through bolts |
| End-of-Line Dead End Service |
Supported, single flange independent fixing |
Not supported, must clamp between two flanges |
| Maintenance Convenience |
Easy disassembly, one side flange can be removed separately |
Need to separate two flanges to take out the whole valve |
| Typical Application |
Pipeline terminal, pump outlet, fire system, marine pipeline |
General straight pipeline, low-cost general fluid control |
| Installation Cost |
Slightly higher, with threaded lug processing cost |
Lower, simpler body casting structure |
If your pipeline needs terminal isolation or frequent maintenance, select a lug butterfly valve; if you only need intermediate pipeline cut-off with strict budget control, wafer butterfly valve is a cost-saving alternative.
Lug Butterfly Valve Professional Installation Guide
Key Installation Recommendations for Maximum Valve Lifespan
Correct installation directly guarantees the bubble-tight sealing performance and long service cycle of your lug butterfly valve. Please follow the below operation standards during on-site pipeline mounting:
- Check the valve body, disc and seat surface before installation, remove welding slag, dust and impurities to avoid seat scratch and leakage
- Confirm the flange parallelism and alignment first, misaligned flanges will cause uneven stress and permanent valve body deformation
- Tighten all flange cross bolts evenly in diagonal sequence to balance clamping force on the whole lug butterfly valve
- Verify the compatibility between seat material and process medium & temperature to prevent early seat aging failure
- Do not apply excessive external pipeline stress on valve body, add pipe support if long heavy pipe connected to valve ends
- Fully open the valve disc when carrying out pipeline pressure test, protect the sealing seat from impact pressure damage
- Do not add extra gaskets between valve flange surface and pipeline flange, our encapsulated seat design eliminates extra gasket demand
- Regularly inspect shaft O-ring and seat sealing condition after installation, conduct leakage test every 6 months for critical industrial pipelines
Proper installation and periodic inspection can greatly reduce unexpected leakage failure and extend the service life of your industrial lug butterfly valve.
