Butterfly valves and flanged butterfly valves are two common types of butterfly valves in industrial piping systems, and they have significant differences in structure, installation methods and application scenarios. Here are the specific differences:

1. Structural characteristics

Clamping butterfly valve:

There are no flanges on either side of the valve body and usually only a few guide bolt holes.

Simple structure, small size, light weight, by a few parts, such as valve body, stem, plate and seat.

Sealing method: Usually adopts elastic sealing, sealing ring can be embedded on the valve body or attached to the periphery of the butterfly plate.

Flange type butterfly valve:

The valve body is provided with flanges on both sides and is connected to the pipe flange by bolts.

The structure is relatively complex, but the sealing performance is more reliable.

Sealing method: Composite seat (such as teflon and synthetic rubber) to ensure good sealing.

2. Installation method

Clamping butterfly valve:

Installation method: Clamp the valve between two pipe flanges with stud bolts.

Advantages: Easy to install, suitable for limited space occasions.

Disadvantages: The other end of the pipe may be affected when disassembling, because a sealing surface is faulty, and both sealing surfaces need to be removed.

Flange type butterfly valve:

Installation method: Connected to the pipe through a flange and bolted.

Advantages: reliable sealing, disassembly will not affect the other end of the pipe.

Disadvantages: Installation is relatively complex, requiring more space and bolts.

3. Application scenario

Clamping butterfly valve:

Application scenario: Pipeline system in petrochemical, electric power, metallurgy and other industries, building water supply and drainage system.

Features: Suitable for small and medium-sized pipe, easy to install and maintain, low cost.

Flange type butterfly valve:

Application scenario: Water plants, power plants, steel plants and other systems in the water supply and drainage equipment, the need for high sealing performance.

Features: Suitable for large diameter pipe, sealing performance is more reliable, but the cost is higher.

4. Compare pros and cons

Clamping butterfly valve:

Advantages: simple structure, convenient installation, low cost.

Disadvantages: Sealing performance may not be as good as flanged butterfly valve, disassembly may affect the other end of the pipe.

Flange type butterfly valve:

Advantages: reliable sealing performance, suitable for large diameter pipelines.

Disadvantages: complex structure, relatively troublesome installation, high cost.

5. Sealing performance

Clamping butterfly valve:

Seal performance depends on elastic sealing ring, suitable for general media and pressure.

Flange type butterfly valve:

Composite seat for more reliable sealing performance, suitable for high pressure and corrosive media.

Sum up

The main difference between the clamp butterfly valve and the flange butterfly valve is the structure, installation method and application scenario. The clamping butterfly valve is simple in structure and easy to install, suitable for small and medium diameter pipelines; The sealing performance of flanged butterfly valve is more reliable, suitable for large calibers and high sealing requirements. When choosing, it is necessary to consider factors such as specific working conditions, media and pressure.