A water pressure system includes a pressure tank installed underground within
the
well casing of a well. The water pressure system includes a submersible pump connected
to the inlet of the pressure tank by a drop pipe. The outlet of the pressure tank
is connected to a second drop pipe and in turn to a discharge pipe for distribution
of pressurized water to a house or other building. A pressure switch is connected
to the pressure tank for controlling the submersible pump. The pressure tank includes
an outer sidewall with an inlet end and an outlet end. A flexible diaphragm bladder
located within the outer sidewall is connected between the inlet and outlet of
the tank. In a first embodiment, a tube extends through the center of the bladder
between an inlet opening and an outlet opening. The tube has a plurality of holes
therein to allow water to flow into and out of the flexible bladder. Pressurized
air fills the space between the bladder and the outer sidewall to pressurize the
water in the bladder. The pressure tank may be used in combination with a flow
control valve, a relief valve, a flow control valve incorporating a relief valve,
a standard submersible pump, and/or a variable speed submersible pump to provide
and maintain a constant flow of water at a constant pressure through the system.
