MCA SV Auxiliary Equipment Part 1 Practice Questions - MCA Small Vessel Engineering - Auxiliary Equipment Part 1 (Qualifications Scotland SQA Written Examination) Exam

What is the primary function of a screw-down non-return (SDNR) valve on a small vessel?

To throttle flow in both directions equally To allow flow in one direction only while providing a positive shut-off when screwed down To relieve excess system pressure to the bilge To isolate hydraulic rams without a seat

Correct Answer:

To allow flow in one direction only while providing a positive shut-off when screwed down

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