How to choose the micro water pump

Now there are many micro-pumping machines, micro-pumps, micro-vacuum pumps, how to choose, the main parameters are "flow", "pressure" or "lift", whether you need self-priming and so on.
When selecting the type, it should be selected according to specific requirements.
First, only need to pump water or solution, it is required to have self-priming ability, and has requirements for flow rate and output pressure.
Note: The pumping working medium is water, non-oily liquid and other solutions (can not contain solid particles, etc.), self-priming function, you can choose the following pumps:
1, the flow requirements are large (about 4 ~ 20 liters / minute), the pressure requirements are not high (about 1-3 kg), mainly used for water circulation, water sampling, lifting, etc., requiring low noise, long life, high self-priming Cheng and so on, you can choose BSP, CSP and other series;
2, the flow requirements are not high (about 1 ~ 5 liters / minute), but the pressure is relatively large (about 2 ~ 11 kg), mainly used for spraying, pressurization, car wash, etc. do not need to work long hours under high pressure or heavy load , you can choose ASP, HSP and other series;
3, for tea table pumping, kung fu tea pumping, spraying, etc., the volume is required to be as small as possible, the flow requirements are small, the noise is small (about 0.1 to 3 liters / minute), optional PHW, ASP and other series.
Second, need to pump water or gas, value, noise, continuous use, etc. Performance description: requires water and gas dual-use, can dry for a long time, does not damage the pump; continuous operation for 24 hours; small volume, low noise, but for flow, pressure The requirements are not high.
1. Pump or vacuum with a micro pump, but sometimes liquid water enters the pump chamber.
2. The micropump is required to both pump and pump water.
3, pumping with a micro pump, but sometimes the pump may have no water to pump, in a "dry" state.
Some conventional pumps are afraid of “dry running” and “dry running” can even damage the pump. The PHW series is essentially a compound-function pump that integrates the functions of a vacuum pump and a water pump. Some people call it a “vacuum pump”. Therefore, in the absence of water, it will draw a vacuum, and when there is water, it will pump water. Whether it is pumping or pumping, it belongs to the normal working range, so there is no such thing as "dry" damage.
4, mainly pumping water with a micro pump, but do not want to manually add "water diversion" before pumping (some pumps need to manually add some "water diversion" before work, so that the pump can pump the low water, otherwise the pump can not pump or even pump Damage), that is, the pump is expected to have a "self-priming" function. At this time, the advantage of the PHW series is that when no water is touched, it is evacuated, and after the vacuum is formed, the water is pressurized by the air pressure, and then the water is pumped.
For the above applications, you can choose the PHW series.
Third, there is a large demand for flow, the medium contains a small amount of oil, solid particles, residues and so on.
Description: In the medium to be pumped,
1. Contains soft solid particles (such as hair, fish manure, sewage sludge, residue, etc.) with a diameter of less than 31 mm, and can be cut into smaller particles, but the viscosity can not be too large!
2. Allow the working medium to contain a small amount of oil (for example, a small amount of oil floating on the surface of the sewage), but not all of it!
3, the flow requirements are large, do not need self-priming function occasions.