What is a Pressure regulator valve?

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A valve that regulates water pressure coming into a building
A pressure regulator is a control valve that reduces the input pressure of a fluid to a desired value at its output.
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Difference between pressure regulating valve and differential pressure valve?

Pressure Differential Valve- maintains a constant Differential pressure across it. Say if P1 was inlet pressure and P2 was outlet pressure PDV will try to keep constant DP. Sa

Is the pressure regulator valve bad if nothing happens when you turn the bolt counter clockwise?

It is often very difficult to tell if nothing happens at first. Ialways fit a gauge at the nearest possible location after the PRV,and look at this every 2 turns. If I cannot