11. A very important part is called the Accumulator Control Valve ( ACV ). 12. These types of valves are also known as Automatic Control Valves . 13. In man-made objects, it can occur in control valves , pumps, propellers and impellers. 14. Rotary control valves , butterfly valve and ball valves are good examples. 15. Whittaker also makes commercial aerospace products such as control valves and safety systems. 16. Pressure independent control valves can be used with any control system. 17. Says Gerstner, " KSB India makes process valves while MIL makes automated control valves . 18. Moving bed reactors require special control valves to maintain close control of the solids. 19. The fluid is controlled directly or automatically by control valves and distributed through tubes. 20. Engine bleed air is admitted through a flow control valve to a heat exchanger.