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The Q-Ball control valve offers a unique concept of noise abatement, cavitation control, and excellent control properties combined with very large flow capacity. The Q-Ball provides noise reduction of up to 18 dB (A) when compared to normal valves.The design is simple and effective. Parallel perforated plates in the flow opening, stage the pressure drop as the flow passes through. This flow treatment reduces velocities, noise generation and cavitation.The Neles Q-Ball has the advantages to make this control valve so successfull: rugged metal-to-metal seating with advanced friction reduction, wide temperature range and self-cleaning trim, very high Cv and very wide rangeability.