The isolation valve on the steam branch pipe should be installed on a horizontal section of pipe close to the main pipe; why does this prevent liquid from accumulating?；

Steam pipelines often contain condensate; connecting the pipe from the top ensures that steam is discharged, whereas connecting it from the bottom will result in condensate being released. The shut-off valve should be located near the main pipe; placing it close to the main pipe ensures a clear separation between the main pipe and the branch pipes when shutting off flow. If the valve is placed far away from the main pipe, the pipeline between the valve and the main pipe becomes longer, and this section of the steam system remains connected to the main pipe throughout. The valve is installed on a horizontal pipe; when the valve is closed, steam in the pipe cools down and condensate is formed. In a horizontal pipe, this condensate flows from the higher points to the lower points, and a drain should be installed at those lower points. In a vertical pipe, some of the condensate remains on the vertical section of the pipe near the valve