Electric gate valve is closed ( Ram) Along the channel axis vertical direction Industrial Valves, mainly for cut off the medium in the pipe on the road, that is fully open or close. In general, electric gate valves cannot be used as a flow adjustment. It can apply pressure at low temperature can also be applied to high temperature and high pressure, and according to the different material of the Industrial Valves. But electric gate valve is generally not used for conveying slurry medium in pipeline. Advantages: (1) fluid resistance small; (2) the opening and closing torque smaller; (3) can be used in the medium flow in two directions of ring network management way, that is to say, the flow of medium is not restricted; (4) is wide open, the sealing surface erosion by working medium is smaller than globe valves; (5) the form structure is relatively simple, manufacture good manufacturability; 6 structure length is shorter. Disadvantages: (1) overall dimensions and open height is bigger, the required installation space is larger; (2) in the process of opening and closing, the sealing surface relative to the friction, friction losses, even at high temperature easy to cause scratches phenomenon; (3) general electric gate valve has two seal face, adds some difficulties to machining, grinding and maintenance; (4) opening and closing time is long. Electric butterfly valve with disc type opening and closing a reciprocating swing around 90 ° to open and close and regulating fluid channel of a valve. Advantages: (1) simple structure, small volume, light weight, material, especially used in large diameter valves; (2) the opening and closing fast, small flow resistance coefficient; (3) can be used in the medium with suspended solids, based on the strength of the sealing surface can also be used for powder and granular media. Can be used in ventilation and dust removal pipe two-way opening and closing and adjustment, it is widely used in metallurgy, light industry, electric power, petroleum chemical industry system of gas pipeline and channel, etc. Disadvantages: (1) flow control range is not big, when open 30%, traffic will be more than 95%. (2) due to the structure of electric butterfly valve and the limitation of sealing material, should not be used in high temperature and high pressure in the pipeline system. General working temperature below 300 ℃, PN40 ( 6 ~ 40) The following. (3) poor sealing performance relative to the ball valve, globe valve, therefore, used for sealing requirements is not very high.
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