Glossary

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Click on the alphabetic index to display terms beginning with the corresponding letter or search for a term below.

Quarter-turn

Category of valves (such as ball, plug, butterfly) which require just a 90 degree turn of the stem to move from the fully open to the fully closed position. See also multi-turn. Note: some larger valves may, for simpler manual operation, be fitted with gearboxes, giving them the appearance of a multi-turn valve.

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