Heavy Duty Equipment Technician Red Seal Exam Prep · Question
A heavy-duty machine's implement circuit requires a consistent lifting speed regardless of the attached load. Which type of directional control valve would be most suitable to achieve this and why?
A closed-centre valve with parallel metering and pressure compensation is ideal because the pressure compensator maintains a constant pressure drop across the m
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Question: A heavy-duty machine's implement circuit requires a consistent lifting speed regardless of the attached load. Which type of directional control valve would be most suitable to achieve this and why?
Answer options:
- Open-centre valve, due to its low-pressure bypass
- Closed-centre valve with series metering, offering precise control without regeneration ✅ Closed-centre valve with parallel metering and pressure compensation, ensuring flow is proportional to spool position and independent of load
- Bypass valve, to reroute excess flow for speed modulation
Correct answer: Closed-centre valve with parallel metering and pressure compensation, ensuring flow is proportional to spool position and independent of load
Explanation: A closed-centre valve with parallel metering and pressure compensation is ideal because the pressure compensator maintains a constant pressure drop across the metering orifice for a given spool position, thereby providing a constant flow rate to the cylinder regardless of changes in the load pressure.
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