DHDA Air Operated Pumps

Double Head Double Acting (DHDA) Hydraulic Power Unit

Air operated, hydraulic pumps for pressure testing, chemical injection and hydraulic power.

Available Models:
  • DHDA-33
  • DHDA-66
  • DHDA-118
  • DHDA-158

Key Features

Hydratron Double Acting Air Driven Liquid HPU’s offer many desirable features:

  • Ability to stall at a predetermined pressure and hold this fixed pressure without consuming power or generating heat
  • No risk of flame or spark
  • Infinitely variable speed/output flowrate control
  • Infinitely variable output pressure control
  • Standard models are suitable for oil or water applications
  • Isolation chamber for Chemical applications
  • No limit or adverse effects in continuous stop/start applications
  • Proven reliability, easy to maintain and robust


  • Air filter, lubricator, pressure regulator, pressure gauge & speed control valve
  • 6” (150mm) diameter panel mounted outlet pressure gauge
  • Pressure release valve with return back to tank
  • Inlet fluid strainer
  • All interconnecting pipework & fittings
  • Robust Stainless Steel Frame as standard


  • Offshore specification available
  • Stroke Counter
  • Outlet Pressure Isolation
  • On board chart recorder
  • Calibration supply reservoir
  • Wheels / castors

All pumps are fitted with pneumatic stroker counter system to provide an economical way of counting the number of pump cycles.

All pumps are fitted with 1/4″ BSP male outlet and crows foot air inlet, but can be changed to suit most commonly used fittings.

Performance Data

Model Max Output Pressure@ 100 psi (7bar) Air Drive Max Oulet Flow Displacement/stroke
Psi Bar Cu Ins/min L/min Cu Ins cc’s
DHDA-33 6728 464 1934 31.72 15.6 255.37
DHDA-66 13300 917 992 16.27 8.0 131.1
DHDA-118 23695 1634 558 9.15 4.5 73.8
DHDA-158 30000 2069 320 5.25 2.6 42.0