Hydraulic Proportional – Flow Rating of Proportional Valves

Required Flow is normally given, Qreq
Nominal valve drop ?p = 10 bar (145 psi)
You must estimate pressure drops,

To find a spool, solve for “Nominal flow”
– Estimate required valve pressure drop
– Q is proportional to square root of corresponding ?p

Then, go to valve data sheet and select the closest spool to this value


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