Question 1 of 20
Q
Excessive lost motion in the valve mechanism of a duplex reciprocating pump will cause the __________.
A
pump to operate sluggishly
B
pistons to stop in mid-stroke
C
cushioning valves to wear
D
pump to short stroke continuously at both ends of the stroke for both cylinders
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Question 1 / 205eccef9bbacbc34ba4d45516
Question 1 of 205eccef9bbacbc34ba4d45516

Excessive lost motion in the valve mechanism of a duplex reciprocating pump will cause the __________.

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Question 1 of 20
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Excessive lost motion in the valve mechanism of a duplex reciprocating pump will cause the __________.

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🔍 Key Concepts

• Duplex reciprocating pump operation (two pistons, double-acting) • What lost motion in valve mechanism actually means (excess clearance, looseness, or delay in valve action) • Effect of delayed or improper suction/discharge valve timing on piston travel and stroke length

💭 Think About

• Think about how the pump normally completes a full stroke when suction and discharge valves open and close at the right time. What happens if that timing is late or ‘sloppy’? • Which choice describes a condition that would be continuous and repeating as long as the looseness exists, not just occasional? • If the valves are slow or loose to respond, what happens to the effective length of the pumping stroke and the smoothness of operation?

✅ Before You Answer

• Relate lost motion to: Does it make the pistons physically seize, or does it change how effectively they use their stroke? • Ask: Would lost motion by itself directly damage cushioning valves, or mainly change the pump’s stroke behavior? • Mentally trace one full cycle: with loose valve linkage, does the pump complete a full stroke, or does it tend to cut off part of the stroke at the ends?

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