Hammelmann pumps in detail
The seal designs which are absolutely unique to Hammelmann enable safe, reliable, continuous duty operation at pressures up to 55000 psi - 3800 bar. The choice of high pressure seal system depends upon the pump’s application.
Packed sealing (up to 3000 bar)
The high pressure seal is made by
packing rings. Plunger guidance is by
means of a separate bush. This packed
seal is particularly good when the
pumped medium is abrasive or corrosive.
Dynamic plunger sealing (up to 2000 bar)
The dynamic plunger sealing system is
used mainly for ultra high operating
pressures. This design also produces very
high volumetric efficiency.
The high pressure seal is formed within the minute cylindrical gap between the plunger and the labyrinth insert. The medium pressure is continuously reduced along the sealing surface.
A minimum amount of high pressure leakage serves as lubricant and is returned to the pump suction chamber.
Dynamic plunger sealing as a tungsten carbide model (up to 3800 bar)