Fluid Mechanics
The inherent characteristic of an equal percentage valve relating flow rate 'q' with valve stem movement 'x' are described by the equation

dq/dx = Kq²
dq/dx = K
dq/dx = K.q
dq/dx = K/q

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Fluid Mechanics
Turbine impeller

Produces only tangential current
Does not produce tangential current
Is effective over wide range of viscosities
Produces only radial current

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