An article takes you through how manual butterfly valves work

An article takes you through how manual butterfly valves work

The manual butterfly valve is one of the commonly used valves for flow control. Its main control mode is to rotate the valve plate and control the flow and pressure of the fluid in the pipeline through the needle shaft in the center of the valve plate. The following is a detailed introduction to the working principle of the manual butterfly valve.

Construction of manual butterfly valve

Manual butterfly valve is mainly composed of valve body, valve shaft, valve plate, sealing ring, actuating device, etc. The valve body is the main part of the manual butterfly valve, connecting both ends of the pipeline; The valve shaft is an important part of supporting the valve plate, connecting the valve body and the valve plate; The valve plate connects the valve shaft and controls the flow and pressure in the pipe by its rotation. The sealing ring is located in the groove around the valve plate and is compressed to prevent fluid leakage through contact with the valve body. The switch of the manual butterfly valve is controlled by the actuating device (handle, gear, motor, pneumatic components, etc.).

Working principle of manual butterfly valve

When the manual butterfly valve is fully open, the valve plate and the valve body channel are exactly the same, then the fluid can freely pass through the pipe. When the manual butterfly valve is turned as a moving device (usually a 90-degree rotation), the valve plate rotates along the valve shaft axis to control the size of the fluid passage in the pipe.

When the valve plate is rotated to 90 degrees, the channel is completely blocked, and the valve is closed and the fluid cannot pass through. If the valve is partially open, the fluid in the pipe cannot pass through the entire channel because the valve plate is tilted inside the pipe, but it can pass through the narrow gaps between the channels.

The closing of the valve plate is usually done by applying pressure to the valve plate. When the manual butterfly valve is closed, the valve plate is pressed against the body. Because of the sealing ring installed between the two components, the sealing ring effectively prevents fluid leakage when the valve is completely closed.

Application scenarios of manual butterfly valves

The application range of manual butterfly valves is very wide, including water treatment, chemical, oil, natural gas and other fields. The working environment in these areas has higher requirements for valves, such as high pressure, high temperature, high corrosion, etc., and manual butterfly valves perform well in these environments and have a longer service life than other valve types.

Advantages of manual butterfly valves

Manual butterfly valves have unique advantages due to the use of new structures and materials. These include: fast switching speed, suitable for the precise regulation of the flow rate of the pipeline system; Good sealing, can avoid the occurrence of fluid leakage, prevent pipeline pollution; Easy maintenance, simple components, easy to replace seals and so on.

In short, the performance of manual butterfly valves in terms of pressure, flow control and fluid cutoff is very excellent, and it is suitable for various applications in various fields and fields. In-depth understanding and understanding of the working principle and composition of the manual butterfly valve can provide certain help for users to choose the most suitable manual butterfly valve, maintenance and use of the manual butterfly valve.