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Gate valve and butterfly valve performance comparison

Posted by Bundor valve
Gate valve and butterfly valve are two very common valves, but there are some friends of gate valve and butterfly valve performance of their respective unfamiliar, this article Bundor valve for you to introduce the performance of gate valve and butterfly valve.
gate valve , butterfly valve
Let's start with gate valves.Gate valve refers to the valve that the gate plate moves along the vertical direction of the channel axis. It is mainly used as cutting medium in the pipeline, that is, fully open or fully closed.General gate valves should not be used as flow control.It can be used for low temperature pressure or high temperature and high pressure, and can be made of different valve materials.But the gate valve is generally not used for conveying mud and other media in the pipeline.
The butterfly valve is a disc type open and close parts reciprocating rotation 90° to open, close and regulate the flow of a valve channel.
Advantages of gate valve: (1) small fluid resistance;(2) Small torque required for opening and closing;(3) can be used in the medium to flow in two directions of the loop network management road, that is to say, the flow direction of the medium is not limited;(4) Fully open, the sealing surface by the working medium erosion than the globe valve small;The shape structure is relatively simple, good manufacturing technology;Structure length is relatively short.
Disadvantages of gate valve: (1) the external size and opening height is larger, the space for installation is also larger;(2) in the process of opening and closing, the sealing person relative friction, friction loss is large, even in the high temperature is easy to cause abrasion phenomenon;(3) general gate valve have two sealing surface, to the processing, grinding and maintenance of some additional difficulties;Open and close for a long time.
Butterfly valve advantages: (1) simple structure, small volume, light weight, consumable, especially for large diameter valves;(2) Fast opening and closing, small flow resistance coefficient;(3) can be used with suspended solid particles of the medium, according to the strength of the sealing surface can also be used in powder and granular media.It is widely used in gas pipeline and water channel of metallurgy, light industry, electric power and petrochemical system.
Disadvantages of butterfly valve: (1) the flow adjustment range is not large, when open up to 30%, the flow will be into more than 95%.(2) Because of the butterfly valve structure and sealing material restrictions, not suitable for high temperature, high pressure pipeline system.General operating temperature below 300℃, PN40 below.(3) sealing performance relative to the ball valve, globe valve is poor, so used for sealing requirements are not very high.