What Is The Difference Between A Butterfly Valve With Lugs And A Butterfly Valve Without Lugs?

Butterfly valve with lugs and butterfly valves without lugs are very different in structure, installation method, sealing performance and application. The specific analysis is as follows:
Structure
Butterfly valve with lugs: the valve body on both sides of a prominent ``lugs' '. The lugs usually have bolt holes and can be connected directly to the pipeline flange, eliminating the disadvantage of traditional flange valve independent flange components. lug design usually comes in two forms, a through-hole (commonly known as Type A in China) and a thread-through hole (known as Type LT in China) with internal threads for different installation scenarios. Some butterfly valves with lugs are designed with double eccentricity so that the butterfly valve opens and closes with less friction and torque, which improves reaction speed and service life.
No lug-eared Butterfly: there is Generally only one shell, no lug-eared butterfly valves insulation structure. butterfly plate plates are usually made of a material,such as stainless steel or cast iron, that may not be as stable and durable in extreme temperature environments as butterfly valves with lugs.
Installation method
Butterfly valve with lugs: piping through flanges to make the connection between valve and piping more stable, suitable for large and medium pipeline systems. Its installation is similar to flange connection, but has its own characteristics. No additional clamping gasket required. The installation process is simple and quick, saving installation time and cost.
Butterfly valve without lugs: clamping flanges installation is required. Note flange selection and installation.
Sealing performance
Butterfly valve with lugs: a sealing gasket are usually used to ensure seal. Some models also have a three-layer seal structure (two-layer seal and one-layer metal sealing) that maintains good sealing performance in high temperature, high pressure and corrosive media, with low pressure to meet the sealing standard.
Butterfly valve without lugs: Although valve seat seal is also very good, but in high temperature, high pressure conditions can be challenging.
Applicable scenarios
Butterfly valve belt lug: widely used in petroleum, chemical industry, smelting, papermaking, environmental protection and other fields. It can be used for flow regulation and isolation control of municipal water supply network, and also for circulation control of various corrosive media in chemical production.
No lug Butterfly: simple structure, easy operation. It is also widely used in various pipeline systems, but may not be suitable for extreme temperature environments or situations requiring high precision flow control.