suction line meaning

[Engineering]
"A pipe or tubing feeding into the inlet of a fluid impelling device (for example, pump, compressor, or blower), consequently under suction."

Examples

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1. method of testing flow capacity of suction line filters and filter-driers
2. The holding tank where the suction line empties sloshes red.
3. The TXV has sensing bulbs connected to the suction line of the refrigerant piping.
4. The pipe work linking the mud tanks / pits with the mud pumps is called the suction line.
5. An external relief valve in the discharge line, with a return line back to the suction line or supply tank provides increased safety.