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The butterfly valve can be divided into offset plate type, vertical plate type, inclined plate type and lever type according to the structural form. According to the sealed form, it can be divided into soft seal type and hard seal type. Soft seals are generally rubber ring seals, and hard seals are usually metal ring seals. According to the connection type can be divided into flange connection and wafer type connection; according to the transmission mode can be divided into manual, gear transmission, pneumatic, hydraulic and electric several.
Butterfly valve advantages
1. It is convenient and quick to open and close, saves labor, and has low fluid resistance. It can be operated frequently.
2, simple structure, small size, light weight.
3, can be transported mud, the liquid at the mouth of the pipeline at least.
4. Under low pressure, good sealing can be achieved.
5, adjust the performance is good.
The disadvantage of the butterfly valve
1, the use of pressure and operating temperature range is small.
2, poor sealing.
Butterfly valve installation and maintenance
1. During installation, the valve flap should be stopped in the closed position.
2. The opening position should be determined according to the rotation angle of the butterfly plate.
3, with a bypass valve butterfly valve, open the bypass valve before opening.
4, should be installed in accordance with the manufacturer's installation instructions, the weight of the butterfly valve, should set a solid foundation.
5. The butterfly plate of the butterfly valve is installed in the diameter direction of the pipe. In the butterfly valve body cylindrical passage, the disc-shaped butterfly plate rotates around the axis, the rotation angle is between 0° and 90°, and when the valve rotates to 90°, the valve is fully opened.
6. If the butterfly valve is required to be used as a flow control, the main thing is to correctly select the size and type of the valve. The structural principle of the butterfly valve is particularly suitable for making large-diameter valves. Butterfly valves are widely used not only in general industries such as petroleum, gas, chemical and water treatment, but also in cooling water systems of thermal power plants.
7. Commonly used butterfly valves have two kinds of clip-on butterfly valves and flange-type butterfly valves. The type A wafer clip type butterfly valve uses a double stud bolt to connect the valve between the two pipe flanges. The flange type butterfly valve has a flange on the valve, and bolts are used to connect the upper flanges of the valve to the pipe flange.
8. The butterfly plate of the butterfly valve is installed in the diameter direction of the pipe. In the butterfly valve body cylindrical passage, the disc-shaped butterfly plate rotates around the axis, the rotation angle is between 0° and 90°, and when the valve rotates to 90°, the valve is fully opened.
Butterfly valve advantages and disadvantages and installation and maintenance
The butterfly valves can be divided into pneumatic butterfly valves, electric butterfly valves, and manual butterfly valves. The PTFE sealing butterfly valve is a type of valve that uses a round butterfly plate as an opening and closing piece and opens, closes, and adjusts a fluid channel with the rotation of the valve stem. The butterfly plate of the butterfly valve is installed in the diameter direction of the pipe. In the butterfly valve body cylindrical passage, the disc-shaped butterfly plate rotates around the axis, the rotation angle is between 0° and 90°, and when the valve rotates to 90°, the valve is fully opened. Multi-level hard-sealed butterfly valve, also known as flap valve, is a simple structure of the regulating valve, but also can be used for low-pressure pipe medium switching control. The butterfly valve (English: butterfly valve) means that the closing member (valve or butterfly plate) is a disk that rotates around the valve shaft to open and close a valve, which is mainly used for cutting and throttling in the pipeline. Butterfly valve opening and closing device is a disc-shaped butterfly plate, rotating around its own axis in the valve body, so as to achieve the purpose of opening and closing or adjusting. The full opening and closing of the butterfly valve is usually less than 90°. The signal butterfly valve and the butterfly rod have no self-locking ability. To position the butterfly plate, a worm gear reducer is installed on the valve stem. The use of a worm gear reducer not only allows the butterfly plate to have self-locking capability, allows the butterfly plate to stop at any position, but also improves the valve's operating performance. , Industry-specific Fluorine-resistant butterfly valve features high temperature resistance, applicable pressure range is also higher, the valve nominal diameter, the valve body is made of carbon steel, the valve plate seal ring with a metal ring instead of a rubber ring. The large-scale high-temperature butterfly valve is made of steel plate welding and is mainly used for high temperature medium smoke ducts and gas pipelines.