Parker PVP48 - Variable Volume Piston Pumps

All control is achieved by the proper positioning of the swash plate. This is achieved by a servo piston acting on one end of the swash plate working against the combined effect of the off-setting forces of the pistons and centering spring on the other end. The control spool acts as a metering valve which varies the pressure behind the servo piston. The amount of flow produced by the Parker Piston Pump is dependent upon the length of stroke of the pumping pistons. This length of stroke, in turn, is determined by the position of the swash plate.

Maximum flow is achieved at an angle of 15-17 degrees. The rotating barrel, driven by the prime mover, moves the pistons in a circular path and the piston slippers are supported hydro statically against the face of the swash plate. When the swash plate is in a vertical position, perpendicular to the center line of the piston barrel, there is no piston stroke and consequently no fluid displacement. When the swash plate is positioned at an angle, the pistons are forced in and out of the barrel and fluid displacement takes place. The greater the angle of the swash plate, the greater the piston stroke.

Features

• High Strength Cast-Iron Housing
• Built-In Supercharger
• High Speed Capability - 3000 RPM
• Two Piece Housing for Ease of Service
• Cartridge Type Controls - Field Changeable
• Replaceable Bronze Clad Port Plate
• Airbleed Standard for Quick Priming
• Hydrodynamic Cylinder Barrel Bearing
• Full Pressure Rating on Water Glycol Fluids
• Filtered and/or Cooled Drain Line Capable - 7 bar (100 PSI) Maximum

Controls

• Pressure Compensation
• Remote Pressure Compensation
• Load Sensing
• Power (Torque) Limiting
• Power Limiting and Load Sensing
• Adjustable Maximum Volume Stop
• Electrohydraulic Pressure
• Electrohydraulic Flow and Pressure (Servo Control)
• Low Pressure Standby