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Butterfly valve characteristics and precautions and butterfly valve advantages and disadvantages

2021-06-21 10:15

Butterflyvalve refers to a valve whose closing member (disc or disc) is a disk that rotates around the valve axis to open and close. It is used mainly for cutting off and throttling in pipelines. The butterfly valve opening and closing piece is a disc shaped butterfly plate that rotates around its own axis within the valve body for the purpose of opening and closing or adjustment. Butterfly valve fully open to the barrier is usually less than 90 °, butterfly valve and the adjustment lever itself has no self-locking ability, in order to butterfly plate positioning, to add worm gear reducer on the valve stem. Using worm gear reducer, not only can the butterfly plate have the self-locking ability, the butterfly plate can stop at any position, but also can improve the operation performance of the valve. Industrial butterfly valves are characterized by high temperature resistance, high applicable pressure range, large nominal valve size, carbon steel valve body, and metal ring instead of rubber ring for the disc seal ring. The large temperature butterfly valve is made of steel plate and is mainly used in the smoke duct and gas pipe of high temperature medium. Butterfly valve installation and maintenance should pay attention to the following matters: during installation, the disc should stop at the closed position. The opening position should be determined by the rotation Angle of the panel. The butterfly valve with bypass valve shall open the bypass valve before opening. Should be installed according to the manufacturer's installation instructions, the weight of the butterfly valve, should set a firm foundation. Butterfly valve advantages are as follows: easy to open and close quickly, save energy, small fluid resistance, can often operate. Simple structure, small volume and light weight. The mud can be transported, and the minimum amount of liquid is stored in the pipe. Under low pressure, good sealing can be achieved. Good regulation performance. Butterfly valves have the following disadvantages: low operating pressure and operating temperature range. Poor sealing. The butterfly valve can be divided into partial plate type, vertical plate type, inclined plate type and lever type. According to the seal form can be divided into two types: sealing type and hard seal type. The soft seal type usually adopts rubber ring seal, and the hard seal type usually USES metal ring seal. According to the connection type, it can be divided into flanged connection and interfacing connection. According to the transmission mode, it can be divided into manual, gear transmission, pneumatic, hydraulic and electric.

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