An open loop circuit piston pump is constantly circulating oil from the tank. The most basic open circuit pump is fixed displacement. To minimise power and heat losses, load-sense piston pumps vary their displacement to meet the demand required i.e. when no power is required the pump will de-stroke to a small standby flow until a demand is placed on it again.
The Danfoss series 45 open circuit axial piston pumps are designed with efficiency, reliability, and low noise in mind. They are also designed to be modular and highly customizable in order to optimise your hydraulic systems. Available in a wide range of displacements from 25cc to 147cc and with continuous pressures up to 310 bar, the series 45 will fit a broad variety of applications and needs.
Maximise available torque while maintaining work function operation with the new Electronic Torque Limiting (ETL) control solution. The ETL is compatible with Danfoss PLUS+1® microcontrollers and is currently available on J, F and E Frame pumps.View More
Closed loop piston pumps are generally used for hydrostatic drive systems. Instead of the return oil from the motor returning to the tank, the oil is redirected back to the pump and re-circulated. A small gear pump called a charge pump replaces a small percentage of oil in the loop with fresh oil on a continuous basis. Controls typically range from pressure compensation, kW limitation (or torque limitation) or electric remote adjustment. Usually on large systems a cooler will be required and a reservoir with a minimum of twice the maximum flow from the pump.
Designed for smaller package sizes, Danfoss pumps provide design engineers with more freedom and flexibility in system design. Performance, power density and functionality are standard features of the Danfoss axial piston pumps for the diverse off-highway mobile market. Danfoss have the displacement, configuration and control option to suit your specific application.
Some typical Danfoss closed loop piston pump ranges include:
The BD series has displacements of 6cc to 21cc up to 245 bar.
The S40P series has displacements of 25cc to 46cc to 400 bar.
The S90P series has displacements of 42cc to 250cc up to 480 bar.
The Danfoss H1 pumps feature common design technologies and assembly techniques. Overall, it offers simpler and high performance designs with fewer parts than previous hydrostatic products. The H1P series offers a range of displacements from 45cc to 250 cc and pressures up to 480 bar.
MP1 pumps offer the performance needed for today's small to medium sized equipment.View More