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Butterfly valve features and precautions and the advantages and disadvantages of butterfly valve

Writer:condiDate:2017-2-15 17:00
Butterfly valve (butterflyvalve) refers to the closure (disc or butterfly plate) for the disc, around the valve shaft rotation to achieve the opening and closing of a valve, the main cut and throat in the pipeline. Butterfly valve opening and closing parts is a disc-shaped disc, in the valve body around its own axis of rotation, so as to achieve the purpose of opening or closing or adjustment. Butterfly valve fully open to the whole is usually less than 90 °, butterfly valve and butterfly rod itself does not have self-locking ability, in order to butterfly plate positioning, to install the worm on the stem reducer. The use of worm reducer, not only can make the disc with self-locking ability, so that the butterfly plate to stop at any position, but also improve the valve operating performance.
 
The characteristics of the special butterfly valve can be high temperature, the pressure range is also applicable, the valve nominal diameter, the valve body made of carbon steel, valve plate sealing ring with metal ring instead of rubber ring. Large-scale high-temperature butterfly valve made of steel welding, mainly used for high-temperature media, smoke duct and gas pipeline.
 
Butterfly valve installation and maintenance should note the following:
 
In the installation, the valve to stop in the closed position.
The opening position should be determined by the rotation angle of the disc.
A butterfly valve with a bypass valve should be opened before opening the bypass valve.
Should be installed according to the manufacturer's installation instructions, heavy butterfly valve, should be set up a solid foundation.
The advantages of the butterfly valve are as follows:
 
1. Open and close quickly and easily, effort, fluid resistance is small, you can often operate.
2. Simple structure, small size, light weight.
3. Can transport mud, in the pipeline mouth to keep the liquid at least.
4. Under low pressure, a good seal can be achieved.
5. Regulatory performance is good.
The shortcomings of the butterfly valve are as follows:
 
The use of pressure and operating temperature range is small.
1. The seal is poor.
2. Butterfly valve according to the structure can be divided into bias plate, vertical plate, inclined plate and lever type. According to the seal can be divided into more sealed and hard seal type two. Soft seal type is generally sealed with rubber ring, hard seal type is usually sealed with metal ring.
 
According to the connection type can be divided into flange connection and folder-type connection; by transmission can be divided into manual, gear drive, pneumatic, hydraulic and electric several.

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Keywords for the information:蝶阀(butterflyvalve)