For continuous operation, choose a heavy-duty radial piston air motor from Gardner-Denver, a Division of Cooper Power Tools, an ISO-9001 facility.  High torque is an inherent characteristic of piston type air motors, making them especially desirable for applications involving heavy starting loads.  Radial piston pneumatic motors provide even torque and full power in either direction of rotation because of overlap of power impulses from at least two pistons on every power stroke.  Gardner-Denver radial piston motors range:  1.5 - 15 HP, 8.6 - 1952 ft.lb.  Radial piston pneumatic motors are available with direct drive or geared. 

To operate properly, the following must be taken into consideration when specifying an air
motor for an application

• Air pressure, psig or bars, at the motor location
• The air line pipe size must be sufficient to supply the volume, cfm or m3/min, of air
  required to operate the motor
• For most plant air systems the pressure varies during the day. The motor should be
  sized according to the minimum air pressure you normally have available.
• For reversible air motors, a four-way control valve is recommended to obtain forward
  and reverse. For one direction of rotation only, a one-way valve may be used.