How do modulating valves, found in some container refrigeration systems, differ in operation from conventional solenoid valves found in the same system?
• Solenoid valve basic function in refrigeration systems • Meaning of a modulating (or proportional) valve in fluid control • How valve design affects continuous vs on/off control of flow
• Think about whether a standard solenoid valve usually works like a simple electrical switch: does it commonly provide just on/off, or multiple partial openings? • Consider what the word "modulating" suggests about how smoothly or gradually a valve can change the amount of flow. • Compare the idea of having only two possible states versus having a continuous range of positions— which type of valve is intended for each role in a container refrigeration system?
• Confirm how a conventional solenoid valve operates: is it normally just fully open or fully closed? • Confirm what modulating implies: does it allow only a few fixed positions, or a continuous range of openings between fully closed and fully open? • Eliminate any options that suggest the opposite of how an on/off solenoid behaves in most control circuits.
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