Q:How to prevent the micro vacuum liquid pump from losing its self-priming ability?

A: Occasionally, a customer has used the micro vacuum liquid pump for a period of time and found that the self-priming height of the micro vacuum liquid pump has dropped, or it has no self-priming ability. It has a greater impact on applications that require self-priming capabilities. The micro diaphragm liquid pump practices self-priming by creating a vacuum in the pipeline. The higher the vacuum that can be established when the liquid pump is running dry, the stronger the self-priming ability. So why does the self-priming ability decrease or disappear?

For the faulty pump with reduced self-priming, after the maintenance engineer disassembled the repaired micro vacuum liquid pump, he found that the diaphragm, one-way valve and pump cavity inside the pump were full of impurities. These impurities would affect the closing sealing of the one-way valve inside the pump, resulting in Sufficient vacuum cannot be established, which is why the self-priming pump loses its self-priming ability.

For such faulty pumps, only a simple cleaning is required to restore the self-priming ability. There are also cases where larger, sharp and hard particle impurities are inhaled, causing damage to rubber parts such as one-way valves, and the parts need to be updated and repaired. Only then can the self-priming ability be restored. So how do we avoid the decline in self-priming ability during use? Currently we recommend two methods:

First of all, every micro liquid pump or air pump of Hilin Technology comes with a filter. Installing this filter at the inlet of the pump can initially filter most particulate matter.

Secondly, if conditions permit, pump clean water as much as possible after use to clean the remaining liquid and impurities in the pump cavity to avoid remaining impurities in the pump, thereby extending the service life of the liquid pump.

Q:How deep can a micro vacuum liquid pump up water?

A: The “suction height” we often refer to can be understood as “the height at which the water pump sucks water up.” What is the relationship between self-priming and suction height? Self-priming refers to the functional description of a water pump, which means that the water pump has a self-priming function that does not require water diversion and automatic exhaust. The suction height indicates the maximum liquid level the pump can suck water up from, and is not entirely related to the self-priming function. It is not that only self-priming pumps have suction height.

Centrifugal pumps all have suction height. However, some centrifugal water pumps do not have self-priming ability. You must add water before using them for the first time. The suction range of the micro vacuum liquid pump is the water absorption height that can be reached without adding water. So what is the maximum suction height of the micro vacuum liquid pump? The suction height of the micro vacuum liquid pump is related to the maximum vacuum degree of the pump. If the pressure unit is converted into a water column, it is probably the water suction height of the micro vacuum liquid pump.

The reason is as follows: the standard atmospheric pressure is about 101.325 kPa. If the pump can pump the water suction pipe to absolute vacuum, the water surface is the standard atmospheric pressure. According to the liquid pressure formula p=ρgh, it is estimated that the height that the atmospheric pressure can press the water up is about h=p /ρg=10m. Therefore, the maximum suction distance of the self-priming water pump is theoretically calculated to be 10 meters. However, in actual conditions, the micro vacuum liquid pump cannot pump the water pipeline to absolute vacuum.

At present, the nominal suction height of most diaphragm liquid pump manufacturers is about 3 meters, and some imported diaphragm pumps can achieve a maximum suction lift of 6 meters. Different models of Hilin micro vacuum liquid pumps have different suction ranges. You can contact pre-sales engineers for free selection support.

Here are some of our popular micro vacuum liquid pumps:

1.S20,Broad Chemical Compatibility and Corrosion Resistance

With a variety of corrosion-resistant engineering plastics, elastic components, and sealing component options, it can achieve a wide range of chemical compatibility and can withstand various corrosive medium such as organic solvents, strong acids, and strong alkalis.the materials are as follows:

ES-EPDM diaphragm,EPDM valves,PPS pump head
KV-PTFE diaphragm,FFKM valves,PVDF pump head
KS-PTFE diaphragm,FFKM valves,PPS pump head
FS-FKM diaphragm,FKM diaphragm,PPS pump head

2.S23,small size and excellent Air Tightness