Why cannot there be backpressure at the vacuum pump outlet?
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Why cannot there be backpressure at the vacuum pump outlet? What will be the consequences? What is the cause? (Are the conditions the same for liquid ring, vane, claw, and screw types?)
I’ve heard of it for the first time. However, the purpose of a vacuum pump is to create a vacuum. If the pressure difference between the outlet and the inlet is too large, it will inevitably increase the load on the equipment and also reduce the level of vacuum at the inlet; therefore, the back pressure at the outlet should not be too high. I’m not sure if this explanation is reasonable.
Back pressure at the vacuum pump outlet can affect the pump’s vacuum pumping capacity.
It’s not that back pressure cannot be present; rather, the back pressure must be within the outlet pressure specified in the vacuum pump design.
Back pressure is allowed, but the problem is that the power rating of your vacuum pump was fixed at the time of selection; if the back pressure increases, the power requirement also increases, and as a result the vacuum pump you’ve chosen will activate its overload protection mechanism
There can be back pressure; atmospheric pressure is equivalent to back pressure, isn’t it?
Back pressure can be present, but high back pressure certainly leads to poorer economic efficiency. Moreover, it increases the requirements regarding the selection and specifications of the vacuum pump.