News <span>Center</span>

News Center

A Comprehensive Guide to Lug Butterfly Valve

2024-04-07 13:41:14

Introduction to Lug Butterfly Valve:

In the realm of industrial valves, the lug butterfly valve stands out as a versatile and efficient component, playing a crucial role in fluid control systems. Designed for reliable performance and easy operation, the lug butterfly valve has become a cornerstone in various applications, ranging from water treatment plants to chemical processing industries.

The lug-type butterfly valve can be driven by manual, worm gear, pneumatic or electric. The connection method can be flange or clamp. The structural form can be single eccentric, center line, double eccentric or triple eccentric. The sealing structure can be soft seal or hard seal. Sealed, the pressure range is PN0.1-10Mpa, the nominal diameter is DN40~2000mm, and the material can be cast steel or stainless steel.

Since the use range of valves is very wide, the same valve has different combinations in different occasions and working conditions.

Understanding the Lug Butterfly Valve Connection Method:

The lug butterfly valve derives its name from the lugs or ears protruding from the valve’s body. These lugs serve as connection points, allowing the valve to be installed between flanges in pipelines. Unlike wafer-style butterfly valves, which fit snugly between flanges, lug butterfly valves feature threaded bolt holes on each lug, enabling a secure connection without requiring additional flange gaskets.

The unique connection method of the lug butterfly valve offers several advantages over other valve types. Firstly, it provides ease of installation and maintenance, as the valve can be quickly mounted or removed from the pipeline without disrupting the entire system. Additionally, the lugs enhance the valve’s stability and prevent it from slipping out of position, ensuring reliable performance even under high-pressure conditions.

Lug butterfly valve

Advantages of Lug Butterfly Valves:


Lug butterfly valves offer significant cost savings due to their simple design and ease of installation, making them a preferred choice for budget-conscious projects.


These valves can handle a wide range of media, including water, air, gases, and corrosive fluids, making them suitable for diverse industrial applications.

Compact Design: 

The compact size of lug butterfly valves makes them ideal for installations where space is limited, maximizing efficiency without compromising performance.  

Low Pressure Drop:

With minimal obstruction to flow, lug butterfly valves minimize pressure drop across the pipeline, ensuring efficient fluid transfer and reduced energy consumption.


Constructed from robust materials such as stainless steel, ductile iron, and PVC, lug butterfly valves exhibit excellent resistance to corrosion, prolonging their service life in harsh environments.   

Quick Operation:

The quarter-turn operation of lug butterfly valves allows for rapid opening and closing, facilitating swift response to process changes and emergency situations.  

Bubble-tight Seal:

Advanced sealing technology ensures a reliable bubble-tight seal, preventing leakage and maintaining system integrity over extended periods.   


Lug butterfly valves are often interchangeable with other valve types, offering flexibility in system design and retrofitting applications.

Material Types and Applicable Working Conditions:

Lug butterfly valves are available in a variety of materials, each tailored to specific working conditions and media:

Stainless Steel:

Ideal for corrosive environments and high-temperature applications, stainless steel lug butterfly valves offer superior durability and resistance to chemical erosion.  

Ductile Iron:

Commonly used in water distribution systems, ductile iron lug butterfly valves provide excellent strength and reliability, suitable for both potable and wastewater applications.  


Designed for handling non-corrosive fluids, PVC lug butterfly valves are lightweight and cost-effective, making them a popular choice for irrigation and HVAC systems.

In conclusion, the lug butterfly valve emerges as a pivotal component in fluid control systems, offering unparalleled versatility, efficiency, and reliability. With its innovative connection method, robust construction, and diverse material options, this valve continues to revolutionize industrial processes across various sectors.

Precautions for lug butterfly valve installation:

① The valve should be stored in a dry, ventilated room, and both ends of the valve channel should be blocked.

② Valves stored for a long time should be inspected regularly to remove dirt. Special attention should be paid to the cleaning of the sealing surface to prevent damage to the sealing surface.

③ Before installation, carefully check whether the valve mark is consistent with the usage requirements.

④ Check the valve channel and sealing surface before installation. If there is dirt, wipe it clean with a cleaning cloth.

Lug butterfly valve

⑤ Check whether the packing is tight before installation. The sealing performance of the packing should be ensured and the rotation of the valve stem should not be hindered.

⑥ The tightening force of the connecting bolts should be even and appropriate during installation.

⑦ This butterfly valve can be installed on horizontal and vertical pipelines. The installation position should ensure that it is easy to use, repair and replace.

⑧ When opening or closing a manual valve, the handle should be used to open and close the valve, and no auxiliary lever or other tools should be used.

⑨ The valve should be inspected regularly during use to check whether the sealing surface is worn and whether the gasket packing is present. If it is damaged and fails, it should be repaired or replaced in time.

 Home  Tel  Mail  Inquiry