Machinery Mate Test 1 Practice

How does a relief valve differ from a sequence valve?

Relief valve releases excess pressure; sequence valve maintains a set pressure to control order of operations. Relief valve directs flow to the reservoir. Sequence valve increases system speed. Relief valve prevents backflow through the pump.

Correct Answer:

Relief valve releases excess pressure; sequence valve maintains a set pressure to control order of operations.

Explanation:

Relief valves and sequence valves handle pressure in hydraulic systems, but they serve different jobs. A relief valve acts as a safety valve: it stays shut until system pressure climbs above its preset limit, then opens to vent fluid back to the reservoir, protecting components from overpressure. A sequence valve is used to control the order of operations by holding a circuit at a defined pressure until the first part of the system reaches that pressure, after which the next part can energize. This creates a deliberate sequence of actions rather than simply limiting pressure. The description that a relief valve releases excess pressure and a sequence valve maintains a set pressure to control the order of operations captures the essential difference.

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