Electric butterfly valve with disc type opening and closing a reciprocating swing around 90 ° to open and close or adjusting medium flow of a valvebutterfly control valve are not only simple in structure, small in size, light in weight, low in material consumption, small in size, small in drive moment, simple in operation and quick in operation, but also have good flow control functions and closed sealing characteristics. It is one of the fastest growing valve varieties in recent decades.
With the application of chemical - resistant synthetic rubber on butterfly valves, the performance of butterfly valves can be improved. Due to the features of anti-corrosion, anti-erosion, stable size, good resilience, easy forming and low cost, synthetic rubber with different properties can be selected according to different application requirements to meet the operating conditions of butterfly valves.
The motorized butterfly valve has a low flow resistance when fully open. When open in about 15 ° ~ 70 °, and can perform a sensitive flow control, thus in the field, the regulation of large diameter butterfly valve application is widespread.
Most butterfly valves can be used in medium with suspended solids due to the wiper motion of the disc. Depending on the strength of the seal, it can also be used in powder and granular media.
Butterfly valves are suitable for flow control. As the pressure loss of butterfly valve in the pipe is relatively large, about three times that of gate valve, so when selecting butterfly valve, the influence of pressure loss on pipeline system should be fully considered, and the strength of disc bearing pressure of pipeline medium should also be considered when closing. In addition, consideration must be given to the limits of the working temperature of the elastic seat material at high temperatures.
Butterfly valve structure length and overall height is small, opening and closing speed is fast, and has good fluid control characteristics. Butterfly valve structure principle is most suitable for making large diameter valve.when the butterfly valve is required to control flow, the most important thing is to choose the correct specification and type of the butterfly valve so that it can work properly and effectively.
In general, short structure length, fast opening and closing speed and low pressure cut-off (small pressure difference) are required in throttling, regulating control and mud media. Butterfly valves are recommended. Butterfly valves can be used in two - position regulating and reducing channels, low noise, cavitation and vaporization, slight leakage into the atmosphere, and abrasion medium. Throttling and adjusting under special operating conditions, or under operating conditions such as strict sealing, severe wear and low temperature (cryogenic).