2-Stage Double Acting Gas Booster Power Unit

A reciprocating, positive displacement gas pump with a directly coupled, integral linear reciprocating air motor. As a Standard Gas Power Unit (GPU), it responds to customers’ needs for pre-engineered and user-friendly Gas Booster systems.

Hydratron 2-Stage Double Acting Air Driven Gas Booster

is a reciprocating, positive displacement gas pump with a directly coupled, integral linear reciprocating air motor, designed to generate High-Pressure Gas output.

With double-acting models, the pressure increase is made possible by means of the area ratio between the larger diameter air drive piston directly connected to two smaller diameter gas pistons having differing diameters to each other. The reciprocating action of the gas booster draws gas at low pressure into the booster then displaces the gas at a higher pressure output from the booster into a closed system.

On 2-Stage Double Acting models, the inlet gas pressure is used to provide additional energy allowing lower inlet pressures, higher output pressures and higher flowrates to be achieved. When using a 2-Stage Double Acting Gas Booster, care must be taken to ensure that the outlet pressure remains lower than the maximum supply pressure multiplied by the combined area ratio of the 2 Gas pistons since this can cause “interstage stall”. To avoid this the inlet gas pressure can simply be reduced.

The Two-Stage Double Acting Gas Booster Power Unit can be provided as a pump only system.


Hydratron Double Acting Air Driven Gas Boosters 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.
  • Easy to apply automatic controls.
  • Standard models are suitable for Air, Nitrogen & Helium. Design options are available for more hazardous gases.
  • No limit or adverse effects in continuous stop/start applications.
  • Proven reliability, easy to maintain and robust.
Feature Icon - High Pressure

5,700 to 21,000 PSI

Icon - Controls

Simple to set automatic controls

Icon - Gas

Air, Nitrogen, Helium & Other Gases Applications

Feature Icon - Easy Maintenance

Easily Maintained

Feature Icon - Frames

Made of Quality Materials

Multiple Pressures Available

Models For All Pressures


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


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


Model Max Output Pressure @ 100 psi (7bar) Air Drive Displacement/Cycle Max Compression Ratio Supply Pressure to Achieve
Max Output Pressure
Actual Output Pressure (Stall Condition) Data Sheet
Psi Bar Cu Ins cc’s Psi Bar
GBD7/33 5,700 393 35.8 586.9 60:1 510 35 33PA+4.7PS Download
GBD15/66 9,000 621 17.6 288.4 60:1 545 38 66PA+4.4PS Download
GBD33/118 14,200 979 7.8 127.9 50:1 685 47 118PA+3.5PS Download
GBD66D/186 21,000 1,448 4.0 65.6 40:1 857 59 186PA+2.8PS Download
Model Number Inlet Pressure Outlet Pressure Flow Data Sheet
Psi Bar Psi Bar SCFM N Ltr/min
GBD7/33 120 8 2,400 166 6.94 196 Download
GBD15/66 200 14 4,000 276 6.38 181 Download
GBD33/118 500 34 10,000 690 5.76 163 Download
GBD66/186 1,000 69 15,000 1034 7.52 213 Download