Class2-FP_Fundamentals

Class2-FP_Fundamentals - ME 4232: FLUID POWER CONTROLS LAB...

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Class #2 Fluid Power Fundamentals ME 4232: FLUID POWER CONTROLS LAB
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2 Notes • Syllabus Questions? • Upcoming Labs: – Lab 4: Pressure Compensated Flow Control Valve – Lab 5: Relief Valves (Direct & Pilot Operated)
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3 Agenda • Review: Momentum, Continuity, Constitutive • Bernoulli’s Eqn Valve Model • Flow Control Valves – Needle Valve – Pressure-Compensated Flow-Control Valve • Pressure Control Valves – Direct-Acting Relief Valve – Pilot-Operated Relief Valve
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4 Review • Momentum Conservation F hyd = PA • Mass Conservation – Assuming Incompressible Flow Flow Conserved v = Q/A • Constitutive Relationships – Relating Pressure Q P v F A
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5 Bernoulli’s Equation
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Needle Valve as Flow Control • Generally modeled with orifice equation: • Needle controls effective orifice area (A o ) • Valve controls flow resistance, not flow directly • Can be characterized by P-Q relationship either graphically or as an equation. ) ( 2
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This note was uploaded on 02/07/2012 for the course ME 4232 taught by Professor Staff during the Fall '08 term at Minnesota.

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Class2-FP_Fundamentals - ME 4232: FLUID POWER CONTROLS LAB...

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