What is the role of butterfly valve? Advantages and disadvantages

The role of butterfly valves

1、Butterfly valve is a valve in which the closing member (valve flap or butterfly plate) is a disc and rotates around the valve shaft to open and close the valve, which mainly plays the role of cutting off and throttling in the pipeline.

2, butterfly valve opening and closing member is a disc-shaped butterfly plate, in the valve body around its own axis rotation, so as to achieve the purpose of opening and closing or adjustment, butterfly valve fully open to fully closed is usually less than 90 °, butterfly valve and butterfly stem itself does not have self-locking ability, in order to the positioning of the butterfly plate, to add a worm gear reducer on the stem.

3、The use of worm gear reducer can not only make the butterfly plate have self-locking ability to stop the butterfly plate in any position, but also improve the operating performance of the valve.

4, the characteristics of industrial butterfly valve can withstand high temperature, the applicable pressure range is also high, the nominal diameter of the valve is large, the valve body is made of carbon steel, the sealing ring of the valve plate is made of metal ring instead of rubber ring, large high temperature butterfly valve is made of welded steel plate, mainly used for high temperature medium of flue duct and gas pipeline.

Advantages of Butterfly Valves

1, easy to open and close quickly, labor-saving, small fluid resistance, can be often operated.

2, simple structure, small size, short structure length, small volume, light weight, suitable for large diameter valves.

3、It can transport slurry and accumulate the least amount of liquid at the mouth of the pipeline.

4、Good sealing can be achieved under low pressure.

5、Good adjustment performance.

6、The effective flow area of the valve seat channel is larger when fully open, and the fluid resistance is smaller.

7, the opening and closing torque is small, because the butterfly plate on both sides of the rotating shaft is basically equal to the action of the medium, and the direction of the generated torque is opposite, so the opening and closing is less laborious.

8、Sealing surface materials generally use rubber, plastic, so the low pressure sealing performance is good.

9、Easy installation.

Disadvantages of butterfly valves

1、Small range of using pressure and working temperature.

2、The sealing is poor.