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Quaternary Ammonia: A series of compounds of ammonia in solution used as algaecides and germicides which reduce the surface tension of the water.

Quaternary Ammonium Compound: A type of algaecide composed of ammonia compounds. Quaternary Ammonium Compound is an effective algaestat for green and blue/green algae.

Quench: The introduction of a fluid outside the seal to cool the product, or dilute any leakage across the seal faces.

Quick Disconnect: Fittings that are locked on the pump ports with a latch or locking device to convert pump ports to threaded or barbed connections , usually used on high pressure pumps.

Quill shaft: A hollow shaft with another shaft inside it.