Fluid Mechanics
Purpose of relief valve in a reciprocating pump is to

Reduce the discharge pressure
Protect the pump against developing excessive pressure
Facilitate unidirectional flow of liquid
Control the rate of discharge

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Fluid Mechanics
The Prandtl mixing length is

Zero at the pipe wall and is a universal constant
Useful for computing laminar flow problems
Independent of the shear stress
Independent of radial distance from the pipe axis

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