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Page Title: What is a Pressure regulator valve? - Answers
Page Description: A regulator is simply a valve with a preset pressure point that
causes the valve to open and close. A pressure sensor (a diaphragm
with an adjustable spring) is on the side of the valve that the
pressure you want is on. When the desired pressure (we will use
50psi) is reached, it causes the diaphragm to expand against the
spring.The diaphran is connected to the valve and when it expands,
it closes the valve, letting no more pressure to build. when you
flush a toilet or turn on the sink, the diaphragm contracts opening
the valve wider and wider until enough water is flowing in to raise
the pressure expanding the diaphragm to close the valve.
the diaphragm is just like a ballon, the more pressure, the more
it expands.
the set screw on most regulators puts more or less pressure on
the diaprham raising or lowering the amount of pressure needed to
move the diaphragm enough to close the valve.
do not confuse the regulator with the pressure switch on a pump
system. they are not the same. the job of the regulator is to keep
constant pressure in your system. the pressure switch on pumps
works about the same but has two preset pressures. the first to
turn a pump off when the desired pressure is reached and the second
to turn it back on. the off pressure is always higher then the on
pressure by about 10psi or your pump would be constantly turning on
and off.
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