Essential Guide: Structural Features & Precautions for Lug Valves

I. Structural features of lug valves

1.Flange connection: The lug valve is connected to the pipeline through a flange. This connection method makes the connection between the valve and the pipeline more stable and is suitable for medium and large pipeline systems. The advantage of flange connection is that it can withstand large pressure and temperature fluctuations, ensuring the stability and safety of the pipeline system.

2.Lug design: The lugs of lug valves usually have two forms, one is a through hole (commonly known as type A in China), and the other is a through hole with internal threads (known as type LT in China). These two designs are suitable for different installation scenarios and provide more installation options. The through hole design is easy to position and install, while the internal thread design can achieve a stable connection with a shorter bolt length.

3.Double eccentric structure: Some lug valves adopt a double eccentric structure design, which makes the valve have less friction and torque when opening and closing, thereby improving the response speed and service life of the valve. The double eccentric structure can also effectively reduce the wear between the valve seat and the butterfly plate and improve the sealing performance.

4.Good sealing: Lug valves usually use sealing gaskets to ensure sealing. Some models also have a triple sealing structure (two layers of sealing and one layer of metal sealing), which can maintain good sealing performance under high temperature, high pressure and corrosive media. This sealing structure ensures the stability and reliability of the valve under various harsh working conditions.

5.Strong corrosion resistance: The valve body and valve plate are made of various materials, such as stainless steel (SS304, SS316, SS304L, SS316L, etc.), which makes the lug valve have good corrosion resistance and can be used in a variety of media environments. This corrosion resistance ensures the stability and reliability of the valve during long-term use.

6.Novel and reasonable design: The lug valve has a novel and reasonable design, compact structure, light weight, and is easy to carry and install. At the same time, its flow characteristics tend to be linear, which makes it have better accuracy and stability when adjusting the medium flow.

II. Precautions for the use of lug valves

1.Installation: When installing the lug valve, ensure that the bolt tightening force is uniform and appropriate to avoid valve deformation or sealing failure. At the same time, attention should be paid to the coaxiality of the valve and the pipeline to ensure that the valve can be opened and closed smoothly. For the design of the lug, the appropriate lug form (through hole or internal thread) should be selected according to the actual situation of the valve and the pipeline, and the appropriate bolts should be used for connection.

2.Seal inspection and replacement: Before installation, the valve seal should be checked to see if it is intact. If damaged, it should be replaced in time. After installation, the sealing performance of the valve should be checked to ensure that there is no leakage. During use, the wear of the seal should be checked regularly, and the seals with severe wear should be replaced in time.

3.Operation and maintenance: The lug valve is easy to operate and easy to control. Some models are also equipped with reliable operating handles and electric devices to ensure precise control and convenient remote operation. During use, the operation of the valve should be checked regularly, and any abnormalities should be handled in time. At the same time, the valve should be kept clean and dry to avoid long-term storage in a humid environment.

4.Storage: Lug valves that have been stored for a long time should be checked regularly, dirt should be removed, and special attention should be paid to the cleaning of the sealing surface to prevent damage to the sealing surface. The valve should be stored in a dry and ventilated room, and both ends of the valve channel should be blocked.

5.In summary, the lug valve plays an important role in the industrial pipeline system with its unique structural design and excellent performance characteristics. During installation and use, relevant installation techniques and precautions should be followed to ensure the stability and reliability of the valve. Through reasonable selection and maintenance, the lug valve will provide a strong guarantee for the smooth progress of industrial production.