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The Back Pressure regulator is a normally-closed valve installed at the END of a piping system to provide an obstruction to flow and thereby regulate upstream (back) pressure. Back Pressure regulator is called upon to provide pressure in order to draw fluid off the system.
Where an obstruction will benefit everything prior to the valve, for example, at the end of a return line and just prior to the tank, a Back Pressure regulator should be used to provide an obstruction so that all the equipment prior will have sufficient pressure. When pressure is too high, the Back Pressure regulator opens and dumps into the tank. Too often, a pressure regulator is installed at this point instead.