In summary, pipeline design and valve selection are crucial topics in the valve and pipe fitting industry. 

Prior to pipeline design, various factors such as medium properties, flow rate, pressure, temperature, pipe length, 

and changes in direction and radius need to be considered. 

    These factors need to be combined with valve selection  in the pipeline system to ensure stable, safe and efficient operation. 

Valve selection also involves factors such as medium properties, flow rate, temperature, pressure, type of valve etc. 

  Finally, consideration needs to be given to the maintenance and upkeep of the pipeline and its various valves to ensure the 

system remains reliable, safe and functional over time.