It is believed that a vacuum system designed for precise vacuum control will be much better from ample technical point of views with the convenience of better performance. Vacuum control valves are used for this purpose. These valves are mechanical devices employed to start, stop, fine control, adjust and maintain the required vacuum levels as well as for desired accurate flow rates of the process fluid in the vacuum system. As systems of various vacuum ranges are the requirement of different processes and research works, therefore the selection of such valves for diverse vacuum ranges is the matter of prime importance. Moreover, selection of the proper vacuum valve also involves a thorough knowledge of the process and processing fluid for which it will be used, the material of which it is made, in what geometry the valve is to fit and the size it must has to perform its designated task accordingly. Further more, the possible adverse occurrences that can take place in the system should also be observed for appropriate valve operation. In this paper