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China Suppliers Factory Concentric Resilient Lug Butterfly Valve with EPDM Seal - DN40-DN600, PN6/PN10/PN16
| Valve Type: | Lug butterfly valve | Structure: | Concentric |
| Standard: | EN593 | Workmanship: | Investment casting |
| Sealing direction: | Bidirectional | Sealing grade: | Zero leakage |
| Temperature: | -20°C < T < 120°C | Operation: | Handle / Lever |
Handle
Various materials
Quick and precise opening and closing switches
Seal
EPDM seal, corrosion resistance, good sealing performance, good resilience, and aging resistance
Shell
Thickened valve body, enhanced impact resistance, and extended service life
Disc
Pinless disc, eliminate leakage and ensure durability
Characteristics
The lug butterfly valve balances the compactness of the clamp valve with the stability of the single-sided flange connection. One end of it has an integral flange (lug), and the other end is a clamp type. During installation, only one side needs to be connected to the pipeline flange, and the other side needs to be fixed with a nut. This design eliminates the need for relying on flange alignment at both ends like clamp valves, making installation more convenient and reliable. It is particularly suitable for pipeline ends or situations that require frequent disassembly and maintenance, while avoiding stress issues that may arise from long bolt penetration. It is a preferred solution that balances space and stability requirements.
Advantages
- 1 Single side flange connection: One end of the valve body comes with an integral flange (lug), and the other end is a clamp type. During installation, simply fix the protruding ear end to the pipeline flange with bolts and tighten the clamping end with nuts.
- 2 When maintenance or replacement of valve internal components is required, only one side of the connection needs to be disassembled to remove or rotate the valve as a whole from the pipeline. Maintenance operations are more convenient and efficient than double flange valves.
- 3 It can better withstand the stress caused by vibration and thermal expansion from the pipeline, as well as the self weight of the valve, reducing the adverse effects of pipeline deformation on the valve sealing surface and helping to maintain the stability of sealing performance in the long term.
- 4 Very suitable for occasions that require frequent opening and closing or adjustment, and have requirements for installation reliability, such as circulating water systems, fire protection systems, ventilation systems, as well as atmospheric or medium low pressure pipelines in industries such as chemical and power.
Packing
Standard export wooden case packaging
Application Scenarios
The lug butterfly valves are widely utilized across industrial, municipal, and specialized systems, leveraging their robust lug connection, balanced compactness and reliability, bidirectional sealing capability, and compatibility with medium-low to medium-high pressure conditions. Their unique design makes them ideal for scenarios requiring frequent maintenance, stable sealing, or adaptability to diverse media.
Frequently Asked Questions
Q
What is the difference between a lug butterfly valve and a wafer butterfly valve?
A lug butterfly valve features integral threaded lugs (ears) around its body that allow it to be bolted directly to a single pipeline flange, making it suitable for dead-end service. A wafer butterfly valve, by contrast, is sandwiched between two flanges using long bolts and cannot isolate flow from one side without support from both flanges.
Q
What temperature range is this lug butterfly valve suitable for?
This valve is designed for operating temperatures between -20°C and 120°C, making it suitable for a wide range of industrial and municipal pipeline applications involving water, air, and mild chemical media.
Q
What does "bidirectional sealing" mean for a lug butterfly valve?
Bidirectional sealing means the valve can achieve a zero-leakage seal regardless of the direction of media flow. This makes it versatile for pipeline systems where flow direction may reverse or vary, ensuring reliable shut-off in both directions.
Q
Why is an EPDM seal used in this butterfly valve?
EPDM (Ethylene Propylene Diene Monomer) rubber is chosen for its excellent corrosion resistance, outstanding resilience, superior sealing performance, and strong aging resistance. It is especially well-suited for water, steam, and mildly aggressive chemical applications within the specified temperature range.
Q
What industries and systems are lug butterfly valves commonly used in?
Lug butterfly valves are widely used in circulating water systems, fire protection systems, HVAC and ventilation systems, as well as medium-low pressure pipelines in chemical, power generation, municipal water treatment, and industrial processing industries.
Q
How is the lug butterfly valve packaged for export?
The lug butterfly valve is packaged in standard export wooden cases, which provide robust protection against impact, moisture, and environmental damage during international shipping and long-distance transportation.