When users use it, they should consider the impact of various factors on use. The maximum suction height H should be lower than the calculated value below (negative values should indicate backflow), otherwise the water pump will not work properly.

H=Pbx10.2-NPSHr-Hf-Hv-Hs

Pb = local atmospheric pressure bar (sea level 1bar)

NPSHr=necessary NPSH m

Hf=loss in water inlet pipe m

Hv=liquid saturated vapor pressure m (converted into water column height)

Hs=safety margin m (generally taken as 0.5m)

Example: Atmospheric pressure Pb=1bar, pump NPSHr=2m, pipeline loss Hf=2m, safety margin Hs=0.5m

Saturated vapor pressure when liquid temperature is 40°C

Hv=Pv/pg=0.7m (converted into water column height)

H=1×10.2-2-2-0.7-0.5=5m

1. Impellers, guide vanes and other flow-passing components are optimized and designed using CFD flow field analysis technology with high efficiency.
2. The static seal between the suction section, middle section and discharge section of the pump adopts metal surface seal and “O” ring double seal. The pump shaft seal adopts high-performance ramie packing or mechanical seal, which is safe and reliable.
3. The first-stage impeller of some models of pumps adopts a double-suction structure, which makes the pump have good anti-cavitation performance.
4. The rotor adopts two static and dynamic balancing processes to strictly control the beating of the rotor. The pump operates stably and has small vibration;
5. The bearing adopts bushing installation structure, enlarged design, easy disassembly and assembly, strong bearing capacity and long service life.
6. The shaft is made of high-quality carbon steel, alloy steel or stainless steel and has undergone multiple heat treatment processes to achieve high stiffness and good stability;
7. Adopting a unique shoulder positioning structure, the impeller positioning is more reliable and the operation is safe;
8. The suction section and discharge section of the pump are made of high-quality castings or forgings, which not only ensures hydraulic efficiency but also ensures the reliability of product operation;
9. Symmetrically arranged impeller and rotor components, the axial forces generated by the impeller cancel each other out, and the axial force can be automatically balanced without using a balancing mechanism. It has fewer wearing parts and is easy to install and maintain.