Check valves are designed to permit ________________ flow?
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Answer: B. Unidirectional
Explanation
Check valves are specifically engineered to permit fluid movement in one direction only. Internal mechanical discs or balls seat automatically to block any reversal of flow direction. Unidirectional flow protection prevents pump damage and maintains system pressure integrity. Check valves operate passively without requiring external actuators or electrical control signals. Common check valve types include swing check, lift check, and dual plate wafer designs. Cracking pressure represents the minimum upstream pressure required to open the check valve mechanism.
Chemical injection pumps use check valves to ensure pumped chemicals enter pressurized reaction vessels safely. Sump pump discharge lines incorporate check valves to prevent water from flowing back into the basin. Hydraulic power units employ check valves to maintain actuator positions during pump shutdown periods. Option A is incorrect because check valves offer automatic passive protection rather than precise flow control. Option C is wrong because check valves explicitly prevent multidirectional or reverse flow circulation. Option D is incorrect because check valves are designed for unidirectional flow as stated in option B.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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