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A device for controlling dust carried by loaded conveyors. A liquid medium is sprayed on the conveyor load only when moving and not when stationary, or when the belt is running unloaded. The spray control is placed centrally beneath the conveyor belt and a load causes the belt to deflect and rotate the driving pulley, which causes the controller valve to open. A belt stoppage or no load causes the valve to close. Nelson
Source: Dictionary of Mining, Mineral, and Related Terms

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