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

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

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Fluid Mechanics
The Prandtl mixing length is

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

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