Positive head installation
In this condition, all shaft seal can be used. so just choose the way suitable your requirement.
Vacuum pump installation( Negative pressure condition)
For this way, Gland packing can be used, no expeller kind. And usually, foot valve is used. But when slurry liquids are pumped, the valve may not function well due to the clogging of solids or wear of the valve itself.
The following self-priming methods are recommendable for such slurry liquids.
Self priming tank method
By using self-priming tank, pumping can be started after the suction tank is filled with water by priming and letting air out. Once the suction tank is filled with water, priming is not needed in the subsequent start of the pump.
Jet priming method
Pumping is started letting out air in the piping by feeding pressurized water. This method s especially effective when high desity slurry liquids are pumped. Also, the pump can be operated automatically by using automatic valves and fitting timer.