Little knowledge of electric regulating butterfly valve

The following introduces some structural principles, installation and maintenance and some precautions about the electric regulating butterfly valve. The electric regulating butterfly valve is usually composed of an angular stroke electric actuator (0~90° partial rotation) and the butterfly valve as a whole through mechanical connection, after installation and debugging. According to the action mode, there are: switch type and adjustment type. The switch type is to directly connect the power supply (AC220V or other power level power supply) to complete the switching action by switching the forward and reverse directions. The adjustment type is powered by AC220V power supply, and receives the preset parameter value 4~20mA (0~5 and other weak current control) signals of the industrial automation control system to complete the adjustment action. Installation and maintenance of electric regulating butterfly valve: 1. During installation, the valve disc should be stopped in the closed position. 2. The opening position should be determined according to the rotation angle of the butterfly plate. 3. For butterfly valves with bypass valves, the bypass valve should be opened before opening. 4. It should be installed according to the manufacturer's installation instructions. For butterfly valves with heavy weight, a firm foundation should be set up. The butterfly plate of the 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 in a fully open state. The characteristics of butterfly valve: butterfly valve is simple in structure, small in size and light in weight, and only consists of a few parts. And it only needs to rotate 90° to open and close quickly, the operation is simple, and the valve has good fluid control characteristics. When the butterfly valve is in the fully open position, the thickness of the butterfly plate is the only resistance when the medium flows through the valve body, so the pressure drop generated by the valve is very small, so it has better flow control characteristics. Butterfly valves have two types of seals: elastic seal and metal seal. Elastic sealing valve, the sealing ring can be inlaid on the valve body or attached to the periphery of the disc. Valves with metal seals generally have a longer life than those with elastic seals, but it is difficult to achieve complete sealing. Metal seals can adapt to higher operating temperatures, while elastomeric seals have the disadvantage of being limited by temperature. If the butterfly valve is required to be used as flow control, the main thing is to correctly select the size and type of the valve. The structure principle of the butterfly valve is especially suitable for making large-diameter valves. Butterfly valves are not only widely used in general industries such as petroleum, gas, chemical, and water treatment, but also in cooling water systems in thermal power plants. Commonly used butterfly valves are wafer type butterfly valve and flange type butterfly valve. The wafer type butterfly valve uses studs to connect the valve between the two pipeline flanges. The flange type butterfly valve has a flange on the valve, and the flanges at both ends of the valve are connected to the pipeline flange with bolts. The structure of the butterfly valve and the problems in the use process: At present, the butterfly valve, as a component used to realize the on-off and flow control of the pipeline system, has been widely used in many fields such as petroleum, chemical industry, metallurgy, hydropower and so on. In the known butterfly valve technology, the sealing form mostly adopts the sealing structure, and the sealing material is rubber, polytetrafluoroethylene, etc. Due to the limitation of structural characteristics, it is not suitable for industries such as high temperature resistance, high pressure, corrosion resistance and wear resistance. A relatively advanced butterfly valve is a triple eccentric metal hard-sealed butterfly valve. The valve body and the valve seat are connected components, and the sealing surface layer of the valve seat is surfacing with temperature-resistant and corrosion-resistant alloy materials. The multi-layer soft stacked sealing ring is fixed on the valve plate. Compared with the traditional butterfly valve, this butterfly valve has high temperature resistance, easy operation, and no friction when opening and closing. When closing, the torque of the transmission mechanism increases to compensate the sealing, which improves the butterfly valve. The advantages of excellent sealing performance and extended service life. Since the multi-layer soft and hard laminated sealing ring is fixed on the valve plate, when the valve plate is normally open, the medium forms a frontal scouring on its sealing surface, and the soft sealing belt in the metal sheet interlayer is washed, which directly affects the sealing performance. Construction and installation points: 1) The installation position, height, and direction of inlet and outlet must meet the design requirements. Note that the direction of medium flow should be consistent with the direction of the arrow marked on the valve body, and the connection should be firm and tight. 2) Visual inspection is required before the valve is installed, and the nameplate of the valve should comply with the current national standard 'General Valve Mark' GB 12220. For the valve whose working pressure is greater than 1.0 MPa and plays the role of cutting off the main pipe, the strength and tight performance test should be carried out before installation, and it is allowed to be used after passing the test. During the strength test, the test pressure is 1.5 times the nominal pressure, and the duration is not less than 5 minutes. The valve housing and packing should be qualified without leakage.
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