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Function of an Orifice on PD Pump

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GaTechTheron

Mechanical
Joined
Jan 26, 2006
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110
Location
US
I came across a graph propotionally relating the increase in viscosity with the increase in pressure on a 3-scerw pump with viscosities under 200ssu. Above this curve, an orifice is require. Can anyone explain why?
 
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