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English Translations » 【化工工程交流】 » Fundamentals of Manufacturing Processes (Multiple Choice) 20

Fundamentals of Manufacturing Processes (Multiple Choice) 20180730

2018-07-30View Original

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Basic Process Knowledge (Multiple Choice) 20180730 Among the following hydraulic control valves, which one belongs to direction control valves? A. Direct-acting sequence valve B. Unloading valve C. Back pressure valve D. Low-pressure selector valve Hint: The first three are all pressure control valves; the low-pressure selector valve is a three-position (or two-position) three-way valve used in pump-controlled closed hydraulic systems for cranes, and it serves to connect the low-pressure oil circuit on the other side to the return line when the working oil pressure in one of the main oil pipes rises, thereby allowing the oil to be returned and cooled.

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Translated at 2026-07-21 03:57:11

Original: https://bbs.hcbbs.com/thread-2032905-1-1.html

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