Vacuum pressure control
Thread Content
May I ask, the vacuum distillation tower system requires a vacuum pressure of 80 torr. Our setup consists of a nitrogen ejector (stage 1) + a water ring vacuum pump (stage 2), with both the vacuum pump and the ejector operating continuously. When the vacuum pressure is high, is it more stable to supply nitrogen at the vacuum pump inlet or to use a bypass circuit for regulation?
Our factory adjusts the pressure in the vacuum system by supplying nitrogen at the inlet.
In addition to the method mentioned on the 3rd floor, an economical approach is to use a vacuum pump system by installing a check valve at the exhaust port, and then creating a return flow path between the exhaust port and the check valve as well as at the suction port.
It is appropriate to install a bypass control valve, setting the minimum reflux level that meets the process requirements； Furthermore, from the perspective of energy conservation, it is recommended that the motor of the water ring vacuum pump be designed as a variable-frequency type.
Considering variable-frequency control, you can buy an inverter
Try turning down the valve at the vacuum pump inlet