Soft backrest butterfly valve has a very small and light torque, flexible rotation, easy switching, removable rubber for future maintenance and replacement, and good appearance and workmanship, which is the top grade of butterfly valve. Soft backrest butterfly valve has a simple structure, small volume, light weight, and consists of only a few parts. And only need to rotate 90 degrees to open and close quickly, simple operation, while the valve has good fluid control characteristics. Butterfly valve in the fully open position, the butterfly plate thickness is the resistance of the medium flow through the valve body, so the pressure drop through the valve is very small, so it has good flow control characteristics, butterfly valve small size, small space. Good sealing, the specific selection, or according to the medium, temperature, pressure, etc. The installation of the clamped butterfly valve is to use double-headed bolts to connect the valve between the two pipe flanges.

Butterfly valve soft backrest and hard backrest are said to be soft seal butterfly valve seat. Both types of valve seats can achieve zero leakage, and in terms of price, the hard backrest valve seat will be cheaper. Soft seal butterfly valve rubber valve seat can be divided into hard backrest rubber valve seat and soft backrest rubber valve seat difference: hard backrest valve seat is pressed on the valve body with abrasive, not easy to replace by yourself, and hard backrest valve seat edge is thinner, and the material used is also inferior material, not recyclable. The valve seat of soft backrest is made according to the model, which is easy to replace by oneself and saves the cost for the enterprise. The seat of soft backrest has a wider edge, so the pipeline can be connected with the valve using a non-specialized flange, and the sealing performance is as good as that of the special flange connection. The selected rubber material is also wear-resistant new rubber, which can be recycled again after damage, saving resources for the country. From the service life of the rubber valve seat, the service life of the soft backrest valve seat is longer than the service life of the hard backrest valve seat, the soft backrest valve seat belongs to the large wide-edge structure. Valve long-term operation process of the valve seat shaft end wear. Valve seat shaft end leakage after the hard back of the valve seat water directly into the valve body outside the leakage phenomenon. But the soft backrest will not appear this situation.

Soft backrest butterfly valve structure characteristics:

1, butterfly valve has a simple structure, small size, light weight, material consumption province, small installation size, rapid switching, 90 degrees reciprocating rotary, driving torque is small, etc., used to cut off, connect, regulate the medium in the pipeline, has a good fluid control characteristics and closing sealing performance.

2、Butterfly valve can transport slurry and accumulate less liquid at the mouth of pipeline. It can realize good sealing under low pressure and good regulating performance.

3、The streamline design of the butterfly plate makes the fluid resistance loss small, which can be regarded as an energy-saving product.

4、The valve stem is a through-stem structure, which is tempered and has good comprehensive mechanical properties and corrosion and abrasion resistance. Butterfly valve opening and closing the valve stem only for rotary movement without lifting operation, the packing of the valve stem is not easy to destroy, reliable sealing. Fixed with the cone pin of butterfly plate, the outstretched end is of anti-washout type design, so as not to collapse out of the valve stem when it is accidentally broken at the connection between the valve stem and the butterfly plate.

Connection size of soft backrest butterfly valve:

Valve metal material, non-metallic material, corrosion and temperature resistance selection table: