The High-pressure centrifugal pump is a variation on the "standard" multi-stage centrifugal pump.
High-pressure centrifugal pumps are all the same in construction, depending on the pressure/capacity:
The first impeller (the rightmost impeller in terms of cross-section) has the function of initial suction of the liquid. The outlet of the first impeller would be led directly to the press in a “standard” single impeller pump. In the case of a high pressure pump, the output is sent to the suction of the second consecutive impeller. As a result, the pressure is increased, the discharge pressure of the first impeller is the suction pressure of the second impeller, this second impeller will generate a pressure increase above this, this process is repeated with each successive impeller.
Very simply put: if a pressure of 3 bar can be achieved per impeller at a certain capacity, the pressure for five impellers, 5 x 3 bar, could be 15 bar if there were no pressure losses. Because this is the case, the pump will see an exponential pressure loss with each additional impeller. With sufficient numbers of impellers, at a certain point no real measurable pressure increase will be generated.
Compared to multi-stage pumps, high-pressure pumps generally have a smaller passage in the impellers, which means that more pressure is generated at a lower capacity.
High-pressure pumps are available in both horizontal and vertical versions.
Also in this type of pump, the pump can be divided into three parts; the bearing bracket, the fluid part and the shaft seal(s).
