Rexroth A4VG 28 40 56 71 90 125 140 180 250 Charge Pressure Valve, Charge Valve

1. Product Overview

This product isRexroth A4VG series swashplate axial piston variable pumpofCore components of the fuel replenishment systemThe A4VG pump is a closed-loop hydraulic pump; its "closed-loop system" relies on a replenishment system to maintain basic pressure and compensate for internal leakage. This replenishment system typically consists of...Oil replenishment pump (usually a gear pump)、Oil replenishment overflow valveandOil replenishment check valveThese components work together to ensure the normal operation of the main pump and the entire closed loop.

2. Core Features

• Maintain system pressureThe replenishment pump draws oil from the tank and sets a low pressure (typically 16-25 bar) through the replenishment overflow valve, forming a closed-loop system.Low-pressure sideContinuous oil supply is provided to replenish internal leakage and prevent air suction.

  
  

• Control the power source of the oil circuitThe replenishment pressure is that of the A4VG pump.Power source for built-in servo control mechanisms (such as proportional valves and solenoid valves)Without stable oil replenishment pressure, the pump's displacement control will fail, rendering the equipment inoperable.

  
  

• Cooling and rinsingDuring the oil replenishment process, a portion of the low-temperature oil will replace the high-temperature working oil in the closed-loop circuit.Flushing valveIt flows back into the fuel tank, serving to cool it and remove contaminants.

  
  

• Protect the main pumpWhen the closed circuit experiences abnormal pressure due to overload or blockage, the oil relief valve will open to release pressure, preventing damage to the main pump and motor due to overpressure.