Butterfly valve features and points for attention and advantages and disadvantages of the butterfly valve

Butterflyvalve is a kind of valve whose closing part (disc or disc) is a disc that rotates around the valve shaft to open and close. It is mainly used for starting, cutting and throttling in the pipeline. Butterfly valve is a disc - shaped disc, in the body around its own axis rotation, so as to achieve the purpose of opening and closing or adjustment. Butterfly valve full open to full close is usually less than 90°, butterfly valve and butterfly rod itself do not have self-locking ability, in order to butterfly plate positioning, to install worm gear reducer on the valve stem. Using worm gear reducer, not only can make the butterfly plate has the self-locking ability, make the butterfly plate stop at any position, but also can improve the operating performance of the valve. Industry special butterfly valve features high temperature resistance, pressure range is also higher, the valve nominal diameter is large, the body is made of carbon steel, the valve plate seal ring USES metal ring instead of rubber ring. Large high temperature butterfly valve is made by welding steel plate, which is mainly used for smoke duct and gas pipeline of high temperature medium.

Butterfly valve installation and maintenance should pay attention to the following matters: in the installation, the disc to stop in the closed position. The opening position shall be determined according to the rotation Angle of the disc. Butterfly valve with bypass valve, open the bypass valve before opening. Should be installed according to the manufacturer's installation instructions, the weight of the butterfly valve, should be set a solid foundation. Butterfly valve advantages are as follows: easy to open and close quickly, labor saving, small fluid resistance, can often operate. Simple structure, small size, light weight. Can transport mud, little liquid accumulation in the pipe mouth. Good sealing can be achieved under low pressure. Good adjustment performance. The disadvantages of butterfly valves are as follows: small operating pressure and temperature range. Poor seal. Butterfly valve can be divided into biasing plate type, vertical plate type, inclined plate type and lever type. According to the sealing form can be divided into two kinds of sealing type and hard sealing type. Soft seal type generally adopts rubber ring seal, hard seal type usually adopts metal ring seal. According to the type of connection can be divided into flange connection and sandwich connection; According to the transmission mode can be divided into manual, gear transmission, pneumatic, hydraulic and electric several.