Views:4 Author:Site Editor Publish Time: 2020-07-31 Origin:Site
Butterfly valve is used to control the flow. This is a quarter rotary valve. The metal flap is set vertically in the closed position and parallel to the fluid, and the flap rotates a quarter turn in the fully open position. These intermediate rotations are necessary to control the flow of liquid. Butterfly valves have various applications, such as agriculture and water or wastewater treatment applications. These are the most common applications where people use butterfly valves. This article is about the advantages and the disadvantages when using a butterfly valve.
Basic description of butterfly valve
The advantages of butterfly valve
The disadvantages of butterfly valve
Butterfly valves can be divided into pneumatic butterfly valves, electric butterfly valves, manual butterfly valves, etc. The butterfly valve is a valve that uses a circular flap as an opening and closing component, and closes and regulates the fluid channel by opening the valve stem.
The disc of the butterfly valve is installed in the diameter direction of the pipeline. In the cylindrical passage of the valve body of the butterfly valve, the disc valve flap rotates around the axis, and the rotation angle is between 0 and 90 degrees. When rotated 90 degrees, the valve is fully open.
Butterfly valve, also known as flap valve, is a simple regulating valve that can also be used for switching control of low-pressure pipeline media. Butterfly valve refers to its closing part (valve or valve flap) is a valve flap that rotates around the valve shaft for opening and closing, and is mainly used to cut and throttle the pipeline.
The butterfly valve opening and closing part is a disc butterfly valve plate, which rotates around its own axis in the valve body to achieve the purpose of opening, closing or adjusting. From fully open to fully closed, the temperature is usually less than 90 degrees. Butterfly valves and stems have no self-locking capability. For the positioning of the butterfly plate, a worm gear reducer is added to the valve stem. The use of the worm gear reducer not only makes the valve flap have the locking ability, but also stops the valve flap at any position, which improves the performance of the valve.
The characteristics of industrial special butterfly valve can withstand high temperature, the applicable pressure range is also high, the valve has a large nominal diameter, the valve body is made of carbon steel, and the sealing ring of the valve plate uses a metal ring instead of a rubber ring. Large high-temperature butterfly valves are manufactured by welding steel plates and are mainly used for flue and gas pipelines of high-temperature media.
According to the structure of butterfly valve, it can be divided into inclined plate type, vertical plate type, inclined plate type and lever type. According to the sealing form, it can be divided into relative sealing type and hard sealing type. Soft seals are usually sealed with rubber rings, and hard seals are usually sealed with metal rings. According to the connection method, it can be divided into flange connection and card connection; according to the transmission method, it can be divided into manual, gear transmission, pneumatic, hydraulic and electric.
(1) Easy to use, fast, labor-saving and low liquid resistance. Can be operated frequently.
(2) Simple structure, small size and light weight.
(3) Mud can be transported, with the least amount of liquid accumulated in the pipe.
(4) Under low pressure, it can achieve good sealing effect.
(5) Good adjustment performance.
(1) Even when fully open, a certain part of the valve flap always faces the fluid. Therefore, regardless of the setting, the operation of the butterfly valve will always result in a pressure switch on the valve.
(2) Its sealing performance is not good.
(3) Throttling with butterfly valves is limited to low pressure drop systems.
(4) When the butterfly valve is working, the possible cavitation and choking flow is a worrying problem.
I believe you have already know all about the butterfly valve after reading this article.