Class2 handout-PCFC+relief

Class2 handout-PCFC+relief - 5. How does the spring rate...

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ME4232: Fluid Power Controls Lab Pressure Compensated Flow Control Valve Jim Van de Ven In the figure is a Pressure-Compensated Flow-Control (PCFC) valve in a hydraulic circuit. In a group of 2 or 3, discuss and answer the following questions: 1. Identify all components in the circuit. 2. What is the flow path through the PCFC valve? 3. With the compensator spool stuck open, what is the relationship between the actuator pressure and velocity? 4. What forces/pressures act on the compensator spool? What is the result?
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Unformatted text preview: 5. How does the spring rate affect the flow accuracy? 6. Sketch the flow vs. upstream pressure, P A , diagram for the PCFC valve. 7. Is this an efficient control method? Q P A ME4232: Fluid Power Controls Lab Pilot Operated Relief Valve Jim Van de Ven Study the drawing of the pilot-operated relief valve. What is the sequence of events as the pressure increases and the valve opens? Hint: the orifice in the spool skirt and relative spring rates are important...
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Class2 handout-PCFC+relief - 5. How does the spring rate...

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