What Is The Difference Between Lug Valves And Wafer Valves?

There are significant differences between lug valves and wafer valves in terms of structure, installation method, performance characteristics and applicable scenarios.

1. Structural differences
Lug valve
Lug valve (taking lug butterfly valve as an example) connects the pipeline through a flange. Its characteristic is that there is a lug on the valve body. The lug usually has a through hole (type A) or an internal thread in the through hole (type LT). These two designs are suitable for different installation scenarios.
Some lug valves adopt a double eccentric structure design, which helps to reduce the friction and torque of the valve when opening and closing.
Wafer valve
The valve body of the wafer valve (taking wafer butterfly valve as an example) is provided with four holes. When installing, long bolts are passed through the connection holes and flange holes of the wafer valve for fixing. Its structure is relatively simple and compact.
2. Installation method
Lug valve
The installation method of the lug valve usually involves flange connection. The bolts pass through the flange and directly tighten the pressure hole on the lug. The bolts at the flange end are fixed with nuts. This installation method makes the connection between the valve and the pipeline more stable.
Wafer valve
The installation of the wafer valve is relatively convenient. You only need to clamp the valve body between two flanges and fix it with long bolts through the connection holes and flange holes. However, the stability of this installation method may be poor.
III. Performance characteristics
Lug valve
Good sealing: Lug valves usually use sealing gaskets to ensure sealing. Some models also have a triple sealing structure, which can maintain good sealing performance under high temperature, high pressure and corrosive media.
Rapid opening and closing: The opening and closing of the lug valve is fast, and the on-off control of the medium can be quickly realized.
Strong corrosion resistance: The valve body and valve plate are made of various materials, such as stainless steel, which makes the lug valve have good corrosion resistance.
Convenient operation: The lug valve is easy to operate and easy to control. Some models are also equipped with reliable operating handles and electric devices.
Wafer valve
Compact structure and light weight: The structural design of the wafer valve makes it small and light, easy to carry and install.
Sensitive action: The action response of the wafer valve is fast, suitable for occasions that require frequent opening and closing.
4. Applicable scenarios
Lug valve
Due to its excellent performance characteristics, lug valves are widely used in petroleum, chemical, smelting, papermaking, environmental protection and other fields. In these fields, lug valves play an important role in connecting, cutting off, and regulating medium pressure and flow.
Wafer valve
Wafer valves are widely used in engineering systems due to their advantages such as short structural length, small size and light weight, especially for low-pressure water systems.
There are significant differences between lug valves and wafer valves in terms of structure, installation method, performance characteristics and applicable scenarios. When choosing, comprehensive consideration should be given to the specific use environment and needs to ensure the selection of the appropriate valve type.