A brief overview and characteristic analysis of butterfly valves

2021-10-23 01:57:10

Overview of butterfly valve standards: The product structure design of the new high-performance butterfly valve is a floating seat. Automatically adjust the valve seat position according to the direction of the pressure source to maintain pressure on both sides of the valve. This also extends the service life of the valve seat. Butterfly valves have a long service life. The dustproof design prevents fluid from entering the valve shaft and causing it to become stuck. According to different working conditions, different materials and performance can be selected for high-performance butterfly valves. The valve seat is made of PTFE, RTFE, PEEK, METAL, and other materials, suitable for petrochemical, oil refining, air separation, CDA, and other working conditions.

Butterfly valve

The main characteristics of butterfly valves are: they are particularly suitable for making large-diameter butterfly valves, and the butterfly plate 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, with a rotation angle

Degrees are between 0 ° and 90 °. When the rotation reaches 90 °, the valve fully opens. Simple structure, low cost, and wide adjustable range. The sealing of butterfly valves is based on rubber, which is far from the metal hard sealing performance of hemisphere valves, ball valves, and gate valves. After long-term use of a hemispherical valve, the valve seat will also experience a small amount of wear. You can continue to use it through adjustments. During the opening and closing process, the valve stem and packing only need to be rotated by 90 °. When there are signs of leakage, press the packing gland. A few bolts can ensure that the packing is not leaking, but other valves are still rarely used to handle small leaks, and large leaks are replaced. The existing relatively advanced butterfly valve is a triple eccentric metal hard seal butterfly valve. The valve body and valve seat are connecting components, and the sealing surface layer of the valve seat is welded with high-temperature and corrosion-resistant alloy materials. The multi-layer soft laminated sealing ring is fixed on the valve plate. Compared with traditional butterfly valves, this butterfly valve has higher temperature resistance, is easy to operate, and has no friction when opening and closing. When closed, the torque of the transmission mechanism increases to compensate for sealing, thereby improving the butterfly valve. Good sealing performance and long service life.

Butterfly valve structure application: The opening and closing speed of butterfly valves is fast,

Butterfly valve

Simple structure, low cost, but poor sealing and pressure bearing capacity. At present, butterfly valves, as components used for switching and flow control in pipeline systems, have been widely used in many fields such as petroleum, chemical, metallurgy, and hydropower. Most of its sealing forms adopt sealing structures, with sealing materials such as rubber and polytetrafluoroethylene.Due to structural limitations, it is not suitable for industries such as high temperature resistance, high pressure resistance, corrosion resistance, and wear resistance.