Excuse me, what are the water collectors and water separators of central air conditioning? Where is it installed in the system?

Many places use central air conditioning cold water system, 1. To ensure that the cooling water at each end is relatively uniform. 2. Ensure that the pipeline route is economical. 3. Control the flow of each water pipe. So there are several main pipes in the design to send chilled water to different places. The water separator is connected to all water supply pipes of the whole central air conditioning cold water system through a large pipe, and each pipe is equipped with a valve, a flow orifice plate and a flowmeter if necessary. The water collector, like the water separator, has no valve and flow orifice, and all return pipe of the whole central air conditioning cold water system is directly connected to the main pipe. The water separator is installed at the water outlet end of the air conditioning cold water pump. The water collector is installed at the water inlet end of the air conditioning chiller.