2-Stage Double Acting

2-Stage Double Acting

A reciprocating, positive displacement gas pump with a directly coupled, integral linear reciprocating air motor. 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. These latter 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. 

All Models can easily be incorporated into easy to operate Standard System gas power/transfer units. 



  • Ability to stall at a predetermined pressure and hold this fixed pressure without consuming power or generating heat. 
  • Energy saving mechanism using the inlet Gas pressure to assist the air drive motor. 
  • 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. 

Air Motor: 

  • Mainly Anodized Aluminum, Stainless Steel and nitrile seals. 

 Hydraulic Section: 

  • Aluminum Bronze, Stainless Steel and Nitrile seals are standard. 


ModelMax Output Pressure @ 100 psi (7bar) Air DriveMax Output Pressure @ 100 psi (7bar) Air DriveDisplacement/CycleDisplacement/CycleMax Compression RatioSupply Pressure for Max Output PressureSupply Pressure for Max Output PressureActual Output Pressure (Stall Condition)
GBD7/33 5,700393 35.8586.960:151035 33PA+4.7PS
GBD15/66 9,00062117.6 288.460:154538 66PA+4.4PS
GBD33/118 14,2009797.8127.950:1685 47 118PA+3.5PS
GBD66D/186 21,0001,4484.065.640:1857 59 186PA+2.8PS

ModelInlet PressureInlet PressureOutlet PressureOutlet PressureFlowFlow
GBD7/33 1208 2,400
166 6.94196
GBD15/66 200144,0002766.38 181
GBD33/118 5003410,0006905.76 163
GBD66/186 1,0006915,00010347.52 213

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