Can a screw pump have its inlet closed to reduce flow rate and thereby lower outlet pressure?
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As the title suggests, has anyone here done this before?
This post was last edited by zdl1966 on 2015-10-17 11:41. It’s not possible. It can only be controlled by adjusting the speed.
Someone in my company said that someone has done this before, but I haven’t; I’m not sure, so I wanted to ask if it’s okay to do it this way
The inlet flow rate can be reduced to lower the outlet pressure, but variable frequency operation is preferred
Normally, volumetric pumps shouldn’t have their inlet valves closed, right? Have you done this before?
The outlet pressure of a positive displacement volumetric pump is determined by the back pressure, while the outlet flow rate and pressure can also be adjusted through bypass return flow; this is the case with the oil pumps in a machine’s lubrication system.
A screw pump is a positive-displacement pump; it’s best to adjust the frequency of the motor. It is also possible to install a bypass at the outlet to change the flow rate in the main circuit.