Is the nitrogen added by the vacuum pump’s gas trap counted in the pumping volume?
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Our vacuum pumps require nitrogen dilution due to the properties of the operating medium. So, is the nitrogen added taken into account in the processing capacity of the vacuum pump?
I think it should be included through the vacuum pump
The gas holdback valve prevents backflow of negative pressure at the inlet when the pump is stopped; this nitrogen is not included in the pumping capacity of the vacuum pump. Nitrogen has been used to replace air as the gas used for pressure suppression; the gas supply must be sufficient. If it is not enough to counteract the backflow caused by vacuum at the inlet, it is possible for the vacuum pump oil to be drawn into the inlet pipe
The dry pumps we use, along with the gas-lock valves, are primarily used to prevent the process gas from condensing; at present, the method for calculating the pumping volume is not yet clear
With your way of using it, the pressure relief valve needs to remain open at all times; this is different from using it when the pump is stopped. Is it to prevent the process gas from condensing inside the pump? This is achieved by introducing nitrogen before it enters the pump chamber; the nitrogen acts as a carrier gas that helps to carry the process medium out quickly, thereby reducing its residence time and preventing its partial pressure from reaching saturation levels. I don’t know how to calculate it
Yes, another main purpose is to dilute the gas, which contains a certain amount of ethylene oxide. It is not before compression in the pump chamber; the technical solution provided by the supplier at present is a dry claw pump, with N2 added at the third stage
I feel the same way, but I need a definite answer; I’m very conflicted
Dry claw pumps currently have a rather limited range of applications in the market; it is recommended to use dry screw vacuum pumps instead