Characteristics and precautions of butterfly valve and advantages and disadvantages of butterfly valve

Butterfly valve (butterflyvalve) refers to a kind of valve whose closing member (valve disc or butterfly plate) is a disc and rotates around the valve shaft to achieve opening and closing. It is mainly used for cutting off and throttling on the pipeline. The butterfly valve opening and closing part is a disc-shaped butterfly plate, which rotates around its own axis in the valve body to achieve the purpose of opening and closing or adjustment. The butterfly valve is usually less than 90° from fully open to fully closed. The butterfly valve and the butterfly stem have no self-locking ability. In order to locate the butterfly plate, a worm gear reducer should be installed on the valve stem. The use of worm gear reducer can not only make the butterfly plate have self-locking ability, so that the butterfly plate can stop at any position, but also improve the operation performance of the valve. The characteristics of the industrial butterfly valve are high temperature resistance, high applicable pressure range, large nominal diameter of the valve, carbon steel for the valve body, and metal ring instead of rubber ring for the sealing ring of the valve plate. Large high temperature butterfly valve is made of steel plate welding, mainly used for flue air duct and gas pipeline of high temperature medium. The installation and maintenance of butterfly valve should pay attention to the following matters: During installation, the disc should stop in the closed position. The opening position should be determined according to the rotation angle of the butterfly plate. For butterfly valves with bypass valves, the bypass valve should be opened before opening. 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 advantages of the butterfly valve are as follows: It is convenient and quick to open and close, labor-saving, small fluid resistance, and can be operated frequently. Simple structure, small size and light weight. Slurry can be transported with minimal liquid accumulation at the pipe mouth. At low pressure, a good seal can be achieved. Good adjustment performance. The disadvantages of butterfly valves are as follows: The operating pressure and operating temperature range are small. Poor sealing. Butterfly valve can be divided into offset plate type, vertical plate type, inclined plate type and lever type according to the structure. According to the sealing form, it can be divided into two types: relatively sealing type and hard sealing type. 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 and wafer connection; according to the transmission mode, it can be divided into manual, gear transmission, pneumatic, hydraulic and electric.
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