P.S. The tower acts as a pressure regulator, as well as storing water.. It's a form of standpipe.
There has to be either a tower or pressure tank in the system, because as I said, water is not compressable. Otherwise, the water in your pipes would act like hydraulic fluid in actuator: depress a piston in one end of the pipe, and the pressure soars until something moves (either another piston or blow-out through the side of the pipe). Most of us would prefer our water systems not to act like a hydraulic jack. :-)
Think of water as like marbles packed into a tube. Add one marble, and something's got to give. Take out one marble, and they all become loose. Now think of a vertical tube full of marbles (a standpipe): you can keep pushing marbles into the bottom, and the pressure goes up smoothly. Take marbles out, and the pressure goes down. Nice and smooth. No worries.
If you put a container of marbles (reservoir) at the top, you can achive a fairly uniform pressure, varying within a fairly narrow range.
Or you could put your marbles in a pressure tank with rubber diaphram holding compressed air, instead of an open tank on a tower. BUT the tank would have t be much larger--holding lots of air-- to get the same degree of pressure regulation.
The pressure tank in my water system operates over a 20 PSI range. At 40 PSI, a pressure switch turns on the well pump. Evey time you turn on the tap, the pressure drops, until it reaches 20 PSI, when the pressure switch turns the well pump on. The the pressure is always flutuctuating. That would be fine, except that we have a tankless waterheater, which shuts off when the flow gets too low. That propably explains the screams I often hear when guests try to take a shower... Funny how fast running water can go from 90F to 50F...
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