During the repair and overhaul of the pump relief valve, used in a hydraulic system, the set point was reduced by 100 psi. Which of the following statements describes the result of the set point being lowered?
• Pressure relief valve function in a hydraulic system • Relationship between relief valve set pressure, system pressure, and actuator speed • What changes — and what does NOT change — when only the set point (cracking pressure) is lowered by 100 psi
• Think about what the relief valve actually controls: does it directly control flow to actuators, or does it limit maximum system pressure? • If the pump starts to relieve at a lower pressure, how does that affect the available pressure to move actuators under load? • For each choice, ask: Is this something that naturally results from a lower maximum system pressure, or is it unrelated to the relief valve setting?
• Be clear on the difference between pressure (force per unit area) and flow (volume per unit time) in determining actuator speed. • Check whether viscosity is a fluid property that depends on mechanical settings like relief valve pressure, or on other factors (e.g., temperature). • Ask yourself if changing the relief valve set point alone would directly make an electrical/solenoid valve operate faster, or if its response is mainly an electrical/mechanical timing issue.
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