Characteristics and applicable media of soft seal butterfly valve

As a component used to cut off the pipeline system and control the flow, the soft seal butterfly valve has been widely used in many fields, such as petroleum, chemical, metallurgy, hydropower and so on. The butterfly plate of the soft 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 °. When it rotates to 90 °, the valve is fully open. The characteristics of a new type of long-life stainless steel butterfly valve and the problems existing in its use. The soft seal butterfly valve can be divided into flange type soft seal butterfly valve, wafer type soft seal butterfly valve and welded type soft seal butterfly valve according to the connection mode.

Features of soft seal butterfly valve

The high-performance soft sealing butterfly valve is characterized in that the valve seat sealing ring is composed of multi-layer stainless steel sheets on both sides of the soft T-shaped sealing ring.

The sealing surface of valve plate and valve seat is of inclined conical structure, and the temperature and corrosion resistant alloy materials are deposited on the inclined conical surface of valve plate; The spring fixed between the adjusting ring pressing plate and the adjusting bolt on the pressing plate are assembled together. This structure effectively compensates the tolerance zone between the shaft sleeve and the valve body and the elastic deformation of the valve rod under the medium pressure, and solves the sealing problem of the valve in the two-way exchange medium transmission process.

The sealing ring is composed of multiple layers of stainless steel sheets on both sides of the soft T-shape, which has the dual advantages of metal hard sealing and soft sealing, and has the sealing performance of zero leakage no matter at low temperature or high temperature. The test shows that the pressure of the sealing surface is caused by the torque of the transmission device and the effect of the medium pressure on the valve plate when the pool is in the positive flow state (the medium flow direction is the same as the rotation direction of the butterfly plate). When the positive medium pressure increases, the closer the inclined conical surface of the valve plate and the sealing surface of the valve seat are squeezed, the better the sealing effect is.

In the countercurrent state, the sealing between the valve plate and the valve seat presses the valve plate against the valve seat by the torque of the driving device. With the increase of the reverse medium pressure, when the unit positive pressure between the valve plate and the valve seat is less than the medium pressure, the deformation stored by the spring of the regulating ring after being loaded can compensate the tight pressure of the valve plate and the valve seat sealing surface and play an automatic compensation role.

Therefore, unlike the existing technology, the utility model is directly installed on the valve body instead of installing soft and hard multilayer sealing rings on the valve plate. Adding an adjusting ring between the pressure plate and the valve seat is a very ideal two-way hard sealing method. It will replace gate valve and ball valve.

Applicable medium of soft seal butterfly valve

As a component used to cut off the pipeline system and control the flow, the soft seal butterfly valve has been widely used in many fields, such as petroleum, chemical, metallurgy, hydropower and so on. The butterfly plate of the soft 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 °. When it rotates to 90 °, the valve plate is fully open. The characteristics of a new type of long-life stainless steel butterfly valve and the problems existing in its use. The soft seal butterfly valve can be divided into flange type soft seal butterfly valve, wafer type soft seal butterfly valve and welded type soft seal butterfly valve according to the connection mode.