Butterfly valve knowledge

The butterfly valve opening and closing member is a disc-shaped butterfly plate that rotates around its own axis in the valve body, so that the valve that is opened or closed or adjusted is called a butterfly valve. When the butterfly valve is fully open to full clearance, it is usually less than 900. The butterfly valve and the butterfly rod itself are not self-locking. For the positioning of the butterfly plate, a worm gear reducer is added to the valve stem. The use of a worm gear reducer not only enables the disc to have a self-locking capability, but also stops the disc at any position and improves the valve's operating performance.
The characteristics of the industrial special butterfly valve can withstand high temperature, the applicable pressure range is also high, the valve has a large nominal diameter, the valve body is made of carbon steel, and the sealing ring of the valve plate uses a metal ring instead of the rubber ring. Large high temperature butterfly valves are manufactured by steel plate welding and are mainly used for flue ducts and gas pipes of high temperature media.
The advantages of the butterfly valve are as follows: 1. The opening and closing is convenient, rapid, labor-saving, and the fluid resistance is small, and can be operated frequently. 2. Simple structure, small size and light weight. 3, can transport mud, less liquid in the pipe mouth. 4, under low pressure, can achieve a good seal. 5, the adjustment performance is good.
The disadvantages of the butterfly valve are as follows: 1. The operating pressure and operating temperature range are small. 2. Poor sealing.
According to the structure, the butterfly valve can be divided into a bias plate butterfly valve, a vertical plate butterfly valve, a slant plate butterfly valve and a lever butterfly valve. According to the sealing form, it can be divided into
two types : a relatively sealed butterfly valve and a hard sealed butterfly valve . The soft seal type is generally sealed with a rubber ring, and the hard seal type is usually sealed with a metal ring.
According to the connection type, it can be divided into
flange connection butterfly valve and wafer type connection butterfly valve ; according to the transmission mode, it can be divided into manual butterfly valve , gear transmission butterfly valve, pneumatic butterfly valve , hydraulic butterfly valve and electric butterfly valve
.
The following matters should be noted for the installation and maintenance of the butterfly valve: 1. When installing, the valve flap should be stopped at the closed position. 2. The opening position should be determined according to the rotation angle of the disc. 3. Butterfly valve with bypass valve, open the bypass valve before opening. 4. It should be installed according to the installation instructions of the manufacturer. The heavy butterfly valve should be provided with a solid foundation.

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