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Glossary of pump terms: Q

Q: Commonly used as a symbol for flow rate (quantity). Units may be expressed as any volume per unit time.

Quadrant: Referring to 1/4th of the circumference of a circle, spanning 90°.

Quadratic: A polynomial equation where the unknown is raised to the power of 2. For example: 9x2+3x+1 =4.

Quality control: A business process to verify and maintain a desired standard of quality in a product or production system.

Quench: Adding fluid outside the seal to either cool the seal, or to dilute any product leaking out of the seal face.

Quill shaft: A shaft that is hollow, containing another shaft inside of it.

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