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China Suppliers Factory Lug Butterfly Valve with EPDM Seal - Concentric Resilient Seated, Sizes DN40-DN600
| Valve Type: | Lug butterfly valve | Structure: | Concentric |
| Standard: | EN593 | Workmanship: | Investment casting |
| Sealing direction: | Bidirectional | Sealing grade: | Zero leakage |
| Temperature: | -20°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
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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.
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Efficient Maintenance: 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.
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Stress Resistance: 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.
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Versatile Application: Very suitable for occasions that require frequent opening and closing or adjustment, such as circulating water systems, fire protection, and chemical industries.
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.
Frequently Asked Questions
What is the main difference between a lug and a wafer butterfly valve?
Unlike wafer valves which are sandwiched between flanges, lug butterfly valves have threaded metal inserts (lugs) that allow them to be bolted directly to the pipeline flanges, providing better stability and allowing for end-of-line service.
Can this lug butterfly valve be used for dead-end service?
Yes, because the lug design allows the valve to be bolted to one side of the flange, it can be used in dead-end service or for downstream piping removal while the system remains under pressure.
What are the benefits of the pinless disc design?
The pinless disc design eliminates the potential for leakage through the pin holes, reduces disc wear, and ensures a more durable, long-term sealing performance.
Is the EPDM seal suitable for all media?
EPDM is excellent for water, steam, and some diluted acids/alkalis within the -20°C to 120°C range. However, it is not recommended for oils or hydrocarbon-based fluids.
Does this valve support bidirectional sealing?
Yes, this lug butterfly valve is designed for bidirectional sealing with zero leakage, making it versatile for various flow directions in complex piping systems.