RK Series 90 Ball Control Valve is recommended for process mediums containing abrasive particles or solids. In such conditions, valve tightness is generally a prime factor to ensure reliable and safe operation of your plant. Primarily designed for on-off application, RK Ball Control Valve can be easily adapted for control action between 10° to 60° opening. Thus, the same Ball Control Valve can serve as a throttling control valve or a tight shut off valve.