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HDP 20

Hammelmann high pressure pumps are built to operate at the continuous maximum duty stated in the performance parameters. Operating pressure and flow rate determine the power and pump selection. We can offer a large number of combinations to meet specific requirements.

Bare shaft pump HDP 20

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Performance parameters

  • Power rating up to 25 hp
  • Operating pressure up to 55,100 psi
  • Flow rate up to 27 gpm

  • Rod force: 3,960 lbf
  • Stroke: 1.18 inch
  • Mean piston speed at n2:
    625 r.p.m. = 2.1 feet/sec
    750 r.p.m. = 2.5
    900 r.p.m. = 3.0

  • Dimensions : 15.7 inch (length) x 8.5 inch (width)  x 23.2 inch (height)
  • Weight: 210 lbs

Hammelmann plunger pumps convert 93 to 98 % of the shaft power to hydraulic energy.



  • Vertical 3 cylinder design
  • Wide variety of complementary ancillaries

Quality and reliability

  • Stainless steel pump head free of alternating stress
  • Bellows form hermetic seal between the suction chamber and crank section
  • Choice of application specific seal assemblies
  • Solid ceramic or tungsten carbide plungers
  • Choice of bronze (standard) or stainless steel suction chamber
  • Crank section calculation by ‘Finite element method’ ensures long working life under continuous load
  • Pressurised oil lubrication system