What kind of working conditions are hard seal butterfly valves used in?

What is a hard seal butterfly valve?

Hard seal butterfly valve, also called flap valve, is a kind of regulating valve with simple structure, and it can also be used for switching control of low pressure pipeline medium. The hard seal butterfly valve mainly plays the role of cutting off and throttling in the pipeline. The opening and closing part of the butterfly valve is a disc-shaped butterfly plate, which rotates around its own axis in the valve body to achieve the purpose of opening and closing or regulating. Hard seal butterfly valve is suitable for regulating and cutting off the flow of media in the pipeline of various corrosive and non-corrosive fluid media in the furnace, gas, steam, natural gas, city gas, hot and cold air, chemical smelting engineering and power generation environmental protection system. Hard seal butterfly valve can be divided into manual hard seal butterfly valve, pneumatic hard seal butterfly valve, electric hard seal butterfly valve.

 

Hard seal butterfly valve is eccentric metal seal structure, sealing form is metal to metal seal, adjustable metal seal ring to metal seal, stainless steel plate and graphite composite plate seal ring to metal seal. Hard seal butterfly valve drive form in addition to electric: manual, worm gear drive, pneumatic, etc.. These valves should generally be installed horizontally in the pipeline.

The butterfly plate of the hard seal butterfly valve is installed in the direction of the diameter of the pipeline. In the cylindrical channel of the butterfly valve body, the disc-shaped butterfly plate rotates around the axis, and the rotation angle is between 0° and 90°. When the rotation reaches 90°, the valve is fully open.

 

Working principle of hard seal butterfly valve.

The hard seal butterfly valve is a valve that opens or closes the pipeline by rotating the circular butterfly plate (sealing member) with the valve shaft, mainly used as a cut-off valve, but also designed to have the function of cutting off and throttling adjustment. Hard seal butterfly valve is used more and more in low pressure and medium diameter pipeline. The butterfly plate of the hard seal butterfly valve is installed in the diameter direction of the pipeline. In the cylindrical channel of the butterfly valve body, the disc-shaped butterfly plate rotates around the axis, and the rotation angle is between 0° and 90°, and the valve is fully open when it rotates to 90°.

The hard seal butterfly valve is simple in structure, small in size, light in weight, and consists of only a few parts. And it can be opened and closed quickly by rotating only 90°, which is easy to operate, while this electric valve has good fluid control characteristics. When the butterfly valve is in fully open position, the thickness of the butterfly plate is the only resistance when the medium flows through the valve body, so the pressure drop generated through the valve is small, so it has good flow control characteristics. The butterfly valve has two sealing types: elastic seal and metal seal. For resilient seal valves, the seal can be set on the valve body or attached to the butterfly plate perimeter.

 

 

Features of hard seal butterfly valve.

1、Butterfly valve Adopt three eccentric sealing structure, the valve seat and butterfly plate almost no wear, sealing function more and more tightly.

2、The sealing ring is made of stainless steel. It has the double advantages of metal hard seal and elastic seal. It has excellent sealing performance in low and high temperature conditions, and has the characteristics of corrosion resistance and long service life.

3. The sealing surface of the plate is made of overlay welded cobalt-based hard alloy, which has wear-resistant sealing surface and long service life.

4. The large size butterfly plate adopts truss structure, high strength, large circulation area and small flow resistance.

5、The valve has two-way sealing function, and the installation is not restricted by the flow of medium, nor by the space position, and can be installed in any direction.

6、The driving device can be installed in multiple positions (rotate 90° or 180°), which is convenient for users. Flange centerline butterfly valve is a good choice.

 

Application of hard seal butterfly valve.

The structure principle of hard seal butterfly valve is especially suitable for making large diameter valves. Hard seal butterfly valves are not only widely used in general industries such as petroleum, gas, chemical, water treatment, but also in cooling water systems of thermal power stations.

 

Advantages of the new butterfly valve - triple eccentric hard seal butterfly valve.

Hard seal butterfly valve, as a component used to realize pipeline system on-off and flow control, has been extremely widely used in many fields such as petroleum, chemical industry, metallurgy, hydropower, etc. In the known butterfly valve technology, its sealing form mostly uses sealing structure, sealing material is rubber, PTFE, etc.. Due to the limitations of structural features, it is not suitable for high temperature resistance, high pressure and corrosion resistance, anti-wear and other industries. A more advanced butterfly valve is a triple eccentric metal hard seal butterfly valve, the valve body and the valve seat for the conjoined components, the seat sealing surface layer welded temperature and corrosion resistant alloy materials. This butterfly valve has the advantages of high temperature resistance, light operation, non-friction opening and closing, and compensation sealing with the increase of torque of the transmission mechanism when closing, which improves the sealing performance and extends the service life of the butterfly valve compared with the traditional butterfly valve.

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