Why is the valve on the pipeline not the same size as the pipe, and how much of a crude pipe can be given? Thank youI'm sorry, I didn't make it clear that when doing pipe work in the factory, for example, 60 of the pipe, and in this pipeline to install the valve to choose DN50, and so on.
The pipe you choose is outside the 60 bar D60 pipe DN50 valve is right, such as D89 pipe with DN80, you are outside diameter and nominal diameter concept is not clear
Do you mean the form of welding? The size of the valve can be changed according to the size of the pipe!
The valves on the pipe should be of the same size, which saves costs and reduces head loss.
If the valve from the opening and closing role, then the valve bore should be the same diameter with the pipe, big waste, small, increase resistance.If the role of the valve is adjusted, and that caliber will be different from the pipe diameter, this is not to reduce the cost of the problem, is a result of calculation, and this calculation results with flow, pressure drop and valve resistance curve.For example, control valve, usually smaller than the pipe diameter, such as pressure reducing valve, will be smaller than the pipe diameter to two.
