The pressure of a process that operates under vacuum will vary if the vacuum system is left unrestrained. All processes do not require pressure control, In certain cases, the higher the vacuum the better the process runs hi most cases, however, pressure control Is necessary to satisfy process requirements or to avoid performance problems. A number of variables should be considered when defining pressure control options for your vacuum system, The type of control may vary based on the type of vacuum equipment. Applying the right technology to a process is important. Understanding the options is key to choosing the right technology.