Vacuum pumps are part of among the final processes in the repair procedure. After you’ve diagnosed and repaired any leaks or other issues in the machine it’s time to recharge. Before recharging you wish to make sure the machine is free of any undesirable gasses, air, or water. If they were to Ac Vacuum Pump china remain in the machine, it would turn the 
oil it operates on into sludge and keep behind damaging impurities.
The draw on vacuum pressure pump is usually broken down into its “CFM,” or Cubic Feet per Minute. To estimate what your CFM needs, look at the tonnage of the systems you focus on. Take the square root of that amount and you’ll obtain the approximate CFM you need to have to work with that system. Typical home systems need 4-5 CFM, while commercial and rooftop systems generally need just as much as 6-8 CFM.