Version with Oil Return Valve

When the machine runs, oil cannot flow back to the bottom oil receiver and it accumulates in the upper chamber of the oil separator.

After 2 hours of continuous operation near ultimate pressure, in case of operation in rough vacuum, after a shorter time:

  1. The machine must be shut down for at least 15 min.
  1. The oil can run down from the upper chamber of the oil separator into the bottom chamber