What are the mechanical seal flushing methods?

What are the mechanical seal flushing methods?




The flushing of the mechanical seal is an effective measure to control the temperature of the mechanical seal and extend the life of the mechanical seal. The purpose of flushing is to take away heat, connect and improve lubrication, prevent liquid film vaporization, prevent accumulation of impurities, prevent air pocket formation, etc.

According to the flushing mode, it can be divided into internal flushing and external flushing. The conveying medium is used for internal flushing, while the external flushing is flushed by introducing external substances.

Internal flushing, positive flushing

Working principle: The outlet port of the pump guides the mechanically sealed medium into the sealing cavity through the pipeline.

Scope of application: used for cleaning medium, p1 is slightly larger than p1, if the temperature of the medium is high or there are impurities, it is necessary to install coolers, filters and other equipment on the pipeline to process the medium.


backwash

Working principle: Use the sealed medium of the working host to introduce the sealed cavity from the outlet end of the pump, and flow back to the pump inlet through the pipeline after flushing.

Scope of application: used for cleaning media, and<P1<P out, when the temperature is high or there are impurities, coolers, filters and other equipment can be installed on the pipeline to process the medium.
full flush

Working principle: Utilize the sealed medium of the main engine, the outlet port of the pump is introduced into the sealing chamber through the pipeline, and after flushing, it flows back to the pump inlet through the pipeline.
Scope of application: used for cleaning media, and p1 is close to p-in and p-out, and the cooling effect is better than the first two