Which of the following valve arrangements...

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Question 1 of 205eccef9bbacbc34ba4d45504

Which of the following valve arrangements permits the reciprocating pump liquid piston to take suction from the suction chamber, and simultaneously discharge through the discharge chamber during the up and down strokes?

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🔍 Key Concepts

• Single-acting vs double-acting reciprocating pumps – when does the pump move liquid on one stroke vs both strokes? • How suction and discharge valves must be arranged so that one side of the piston can take suction while the other discharges, on every stroke. • The difference between valves located in a water chest versus directly in the liquid cylinder.

💭 Think About

• Visualize the piston at the left end of the stroke: which side is filling (suction) and which side is emptying (discharge)? What valves must open/close to make that happen? • Now visualize the piston at the right end of the stroke (moving the opposite way). For the pump to discharge on both strokes, what must change about which valves open, and where they are located? • Compare each answer choice and ask: does this arrangement obviously allow both sides of the piston to alternately take suction and discharge, or does it limit action to one side only?

✅ Before You Answer

• Identify which options clearly describe separate suction and discharge valves (check for both functions, not just relief). • Check which arrangements place valves so they can serve both ends of the liquid piston, not just one end of the cylinder. • Eliminate any choice that obviously applies to single-acting operation (liquid moving on only one stroke) rather than double-acting operation (liquid moving on both strokes).

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