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Problems encountered when using soft seal butterfly valve

Author:Site Editor     Publish Time: 2018-12-21      Origin:Site

The disc of the soft-seal industrial butterfly valve is installed in the diameter direction of the pipe. In the cylindrical channel of the butterfly valve body, the disc rotates about the axis from 0° to 90°. Because it has such excellent performance, in recent years, the butterfly valve in industrial applications more and more widely.


Here is the content list:

  • What is butterfly valve made of?

  • What are features of butterfly valve?

  • What are Problems during use butterfly valve?

 

What is butterfly valve made of?

Soft seal triple offset butterfly valve as a component used to achieve pipeline system cut off and flow control, has been widely used in many fields such as petroleum, chemical, metallurgy, and hydro power. In the known butterfly valve technology, the sealing material is rubber, PTFE, and the like. Due to structural characteristics, it is not suitable for high temperature, high pressure, corrosion and wear resistance industries. The existing one of the more advanced butterfly valves is metal hard-seal triple offset butterfly valve. The valve body and the valve seat are connected components, and the valve seat sealing surface layer is surfacing with temperature-resistant and corrosion-resistant alloy materials.

 

What are features of butterfly valve?

When the rotation is 90°, the valve is fully opened. The characteristics of the new high-life stainless steel butterfly valve and the use of the butterfly valves in the use process are generally horizontal. Soft seal butterfly valve can be divided into flange type soft seal butterfly valve, wafer type soft seal butterfly valve and welded soft seal butterfly valve according to the connection mode.

The multi-layer soft stack seal is fixed on the valve plate. Compared with the traditional butterfly valve, this type of butterfly valve has high temperature resistance, easy operation, no friction when opening and closing, and the seal is increased when the torque of the transmission mechanism is increased during closing and the butterfly valve is improved. The sealing performance and the advantages of prolonged service life.

 

What are problems during use butterfly valve?

First, because the multi-layer soft and hard stack seals are fixed on the valve plate, when the valve plate is always open, the media forms a frontal flush against its sealing surface, and after the soft seal tape in the metal plate inter layer is washed, it directly affects the sealing performance.

Second, subject to structural constraints the structure is not adapted to the following diameter DN200 valves, because the overall structure of the valve plate is too thick, large flow resistance.

Third, due to the principle of triple eccentric structure, the seal between the sealing surface of the valve plate and the valve seat is to press the valve plate against the valve seat by the torque of the transmission device. In the normal flow state, the higher the medium pressure, the tighter the seal extrusion. When the medium of the flow passage is reversed, the seal begins to leak when the positive pressure between the valve plate and the valve seat is smaller than the pressure of the medium as the pressure of the medium increases.

The characteristics of high-performance soft seal butterfly valve are that the seat seal ring is composed of a multi-layer stainless steel plate on both sides of a soft t-ring.

The sealing surface of valve disc and valve seat is of oblique cone structure. The bevel surface of valve plate is made of alloy material which is resistant to high temperature and corrosion. The structure effectively compensates the elastic deformation of tolerance zone between shell, valve body and valve stem under the action of medium pressure, and solves the sealing problem of valve in the process of two-way medium exchange.

 

Above is the butterfly valve in the use of the process will occur problems and related solutions, if you buy inferior butterfly valve, these skills can help you to a large extent. If you want to buy quality butterfly valves, welcome to buy from us, in addition, if you have any questions can consult us.


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