Both fixed and variable displacement models make up this range of axial piston pumps. Their high performance ratings and efficiencies are achieved with a variety of hydraulic fluids. Fixed displacement models are noted for their volumetric and mechanical efficiencies. Variable displacement models can closely match pressure and/or flow demand with a control selected from: Pressure compensator with or without a remote control facility. Pressure compensator with adjustable displacement control. Load sensing compensator. Mechanical (lever) control. Handwheel control