You install a pressure vessel anywhere on the delivery or pressurised side of a system. All pressure pump systems need a check valve (or 1 way valve) installed in the pipework. This can be installed on the suction side (as a foot valve or on the pump inlet) or just after the pump on the outlet. The check valve stops water flowing backwards and the pressure dropping when the pumps turns off. This allows a pressure pump to build up pressure and let the automatic switch turn it off.
A pressure vessel can be installed anywhere after this check valve. This means that when all the taps in the system are shut, then the pressure in the system builds. When the water pressure in the system builds to beyond the air pressure sored in the tank, then the air starts to compress and the water fills up the wet side of the tank. Once the wet side of the tank has compressed the air as much as it can, then the pressure builds a little bit more and then switches off.
You simply cut in a T piece or a tapping saddle into the outlet pipework and have a pipe or a piece of pressure hose across to the inlet of the tank. Some tanks (up to about 15L) are OK to mount on the pipe or on top of the pump. Once they get beyond this size, they usually have to be mounted on a base and most of the time they actually come with a base .
Pressure tanks are a cheap, simple and effective piece of gear that will help protect your pump and provide you with a good constant pressure and flow of water for whatever application you need.
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