Ap2d21 Pump Repair Parts Valve Plate Excavator Pump Replaecment Parts

Ap2d21 Pump Repair Parts Valve Plate Excavator Pump Replaecment Parts

Valve plate porting and commutation: As the cylinder block rotates, each piston chamber is automatically alternately connected to the high-pressure and low-pressure ports to complete oil suction and discharge, replacing a separate directional valve.

Sealing and isolation: Forms an oil film friction pair with the end face of the cylinder block, isolates high-pressure and low-pressure chambers, and prevents internal leakage.

Load bearing: Withstands hydraulic clamping force and piston side force, and is one of the three major friction pairs in pumps/motors.

Vibration and noise reduction: Reduces pressure shock, flow pulsation and noise via transition zones and pressure relief grooves.

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