C O N T R O L L E D
M O T I O N   I N C .
              
   ~ INTELLIGENT FLUID POWER ~

HARTMANN CONTROLS ~ HYDROPERFECT INT'L ~ NACHI ~ NORTH AMERICAN HYDRAULICS ~ BLACK BRUIN ~ PRINCE ~ VONRUDEN

PUMPS:  Open & Closed Loop ~ Fixed & Variable Displacement ~ Pressure Compensated Axial Position ~ Radial Piston ~ Gear ~ Vane 

MOTORS:  Fixed & Variable Displacement ~ Axial Piston ~ Radial Piston ~ Gear ~ Gerotor Vane Motors ~ Rotary Actuators

NAHI

Hydraulic pumps are used in hydraulic drive systems and can be hydrostatic or hydrodynamic.

Hydrostatic pumps are positive displacement pumps while hydrodynamic pumps can be fixed displacement pumps, in which the displacement (flow through the pump per rotation of the pump) cannot be adjusted, or variable displacement pumps which have a more complicated construction that allows the displacement to be adjusted.

A Hydraulic motor is a mechanical actuator that converts hydraulic pressure and flow into torque and angular displacement (rotation). The hydraulic motor is the rotary counterpart of the hydraulic cylinder.  Conceptually, a hydraulic motor should be interchangeable with a hydraulic pump because it performs the opposite function - much as the conceptual DC electric motor is interchangeable with a DC electrictal generator. However, most hydraulic pumps cannot be used as hydraulic motors because they cannot be backdriven. Also, a hydraulic motor is usually designed for the working pressure at both sides of the motor.

Hydraulic pumps, motors, and cylinders can be combined into hydrualic drive systems. One or more hydraulic pumps, coupled to one or more hydraulic motors, constitutes a hydraulic transmission.