Axial Piston Variable Pump HP4VC Series：0* Closed circuits Size：28/45/53 mL/r Rated pressure：30 MPa Max. pressure：35 MPa Axial piston variable pump in swashplate design for hydrostatic drives in closed circuits The flow is proportional to the drive speed and displacement and is infinitely varied The output flow increases from zero to the maximum value as the swashplate swivels The flow direction changes when the swashplate is moved through the neutral position Various mutually compatible control options to provide diverse control and regulation functions Two pressure relief valves on each high-pressure side to prevent overload of hydrostatic drives (pump and motor) Pressure relief valve with boost function Integrated boost pump works as the boost and control pump Maximum boost pressure limited by integrated boostpressure relief valve With integrated power cut-off valve as standard HP4VC Axial Piston Variable Pump

HP4VC丨Piston Pump Type Code Axial piston unit - Swashplate design, variable, for closed circuits Variable control Pilot pressure control Without inlet filtration With inlet filtration Mechanical servo With neutral position switch Hydraulic control With brake valve, NO &neutral position switch With brake valve, NC &neutral position switch With brake valve, NC With proportional solenoid Electric control With brake valve, NO Without inlet filtration With inlet filtration With switching solenoid Without inlet filtration With inlet filtration Pressure cut-off valve 28 D Without pressure cut-off valve...

HP4VC丨Piston Pump Type Code Stroking chamber pressure port(X3/X4) 28 F Without port X3/X4 (without code) Without DA control valve With DA control valve Direction of rotation (viewed on drive shaft) 28 K Nitrile rubber (NBR) seal, shaft seal in fluoroelastomer (FKM) Nitrile rubber (NBR) seal, shaft seal in nitrile rubber (NBR) Drive shaft Splined shaft ANSI B92.1-1976 N With connecting flange For the 1st pump of a combination pump Working ports (viewed on drive shaft) Ports at same side R Suction port downwards, working port leftwards Suction port upwards, working port rightwards HP4VC Axial Piston...

HP4VC丨Piston Pump Type Code Boost pump and through drive 28 Without through drive Integrated boost pump Hub for splined shaft 5/8″ 9T 16/32DP Hub for splined shaft 7/8″ 13T 16/32DP Without through drive Without integrated boost pump High-pressure relief valve 28 With high-pressure relief valve, direct operated, fixed setting Without bypass valve Without bypass valve Without bypass valve With bypass valve With bypass valve With bypass valve External suction filter (not included in delivery, to be selected by customer) External pressure filter (not included in delivery, to be selected by customer)...

HP4VC丨Piston Pump Product Structure Control Valve Housing Control Piston Flange Cap Cylindrical Roller Bearing Adapter Plate Shaft Seal Cover Oil Seal Drive Shaft Boost Pressure Relief Valve External Gear Inner Rack High-pressure Relief Valve Crescent Bearing Retaining Cylinder Cradle Plate Block Valve Plate Piston-slipper Assembly Hydraulic Schematic Diagram HW Control Valve High-pressure Relief Valve Boost pump Pressure Cut-off Valve Boost Pressure Relief Valve Mechanical Stroke Limiter Not included in the delivery HP4VC Axial Piston Variable Pump

Hydraulic Fluids Mineral oil Working Viscosity In order for the optimum efficiency and service life, it is recommended to select the working viscosity at working temperature within the range below: opt = optimal working viscosity 16...36 mm2/s It is subject to the temperature of a closed circuit. Limit Viscosity Limit viscosity： Vmin=5mm2/s Short-term operation(t＜3min) Permissible maximum temperature tmax=+115℃ Working Pressure Range Vmax=1600mm2/s Short-term operation(t＜3min) Cold start(p≤3Mpa，n≤1000rpm，tmin=-40℃) Only for no-load start, it must reach the optimum working temperature in 15 min....

HP4VC丨Piston Pump Technical Data Size Large displacement Boost pump(△p=2MPa) Variable pump Limit maximum Intermittent maximum Minimum Flow Power Moment of inertia of drive shaft 4) Case volume Weight (without through drive) 1) Factory default 2) Power at half corner power (e.g. at Vg max and Pn/2) 3) At high-speed no-load operation; at overspeed, Δp =7-15MPa and Vg max; at reverse peak load, Δp<30MPa, t<0.1s 4) Without boost pump 5) Only valid for a single pump Specification Calculation Flow Δp = Differential pressure,MPa Torque HP4VC Axial Piston Variable Pump

HP4VC丨Piston Pump HD - Pilot Pressure Control Correlation of Direction of rotation, Control and Flow direction Dependent on the difference between the pilot pressure Pst (at ports Y1 and Y2) of two control lines, the variable cylinder of the pump obtains control pressure via the HD controller so that the swashplate moves to infinitely adjust the displacement. Each control line corresponds to one flow direction. HD1：without inlet filter HD3：with inlet filter (standard) Direction of rotation (viewed on drive shaft) Pilot Pressure Control Pressure Flow Direction Working Pressure Pilot pressure at...

HP4VC丨Piston Pump HW - Mechanical Servo Control Correlation of Direction of rotation, Control and Flow direction Dependent on the moving direction a or b of the control lever, the variable cylinder of the pump obtains control pressure via the HW controller so that the swashplate moves to infinitely adjust the displacement. Each moving direction of the control lever corresponds to one flow direction. 。 β in Direction of rotation (viewed on drive shaft) Pilot Pressure Control Pressure Flow Direction Working Pressure Swivel angle β of control lever： Start of control β=3° End of control β=29°(maximum...

HP4VC丨Piston Pump HW - Mechanical Servo Control Variant I:With Neutral Position Switch, HWL Hydraulic schematic diagram,HWC With NC Brake Valve The neutral position switch is closed when the control lever on the HW control valve is in its neutral position. The switch opens when the control lever is moved out of the neutral position in either direction. The neutral position switch protects the systems that required zero flow under certain working conditions, such as starting the engine. Technical data, neutral position switch Switching capacity Hydraulic schematic diagram,HWL Zero resistance in...