HY Series Axial Piston Pump | HY55Y HY63Y HY71Y-RP/LP | High Pressure Hydraulic Pump

The HY Series Axial Piston Pump (including HY55Y, HY63Y, HY71Y) from Chengyuan Hydraulic is a robust power source engineered for high-pressure industrial applications. Utilizing a swashplate design, these pumps are optimized for long service life and high efficiency at medium-to-high speeds. Available in both RP (Right-hand/Clockwise) and LP (Left-hand/Counter-clockwise) rotations, they offer versatile integration for various power units. At Chengyuan, every unit undergoes 100% simulation load testing to ensure exceptional volumetric and mechanical efficiency. Its compact footprint and high power density make it a premier choice for machine tools, forging machinery, and metallurgical equipment.

Technical Specifications

• Product Series: HY Series Axial Piston Pump

• Core Models: HY55Y, HY63Y, HY71Y

• Displacement Options: 55ml/r, 63ml/r, 71ml/r

• Rated Pressure: 20 MPa / 25 MPa

• Peak Pressure: 31.5 MPa

• Rated Speed: 1500 r/min

• Max. Speed: 2000 – 2500 r/min (depending on inlet pressure)

• Direction of Rotation: RP (Right-hand/Clockwise) / LP (Left-hand/Counter-clockwise)

• Housing Material: High-strength cast iron / Forged steel

• Piston Sub-assembly: Premium alloy steel with specialized hardening treatment

Key Technical Advantages:

• Bimetal Valve Plate: Features a high-performance bimetal valve plate with excellent self-lubricating properties. It maintains a stable oil film even under frequent high-pressure start-stop cycles, effectively preventing plate seizure.

• Precision-Ground Piston Assembly: The pistons and cylinder bores are precision-ground for micron-level fit. The hardened alloy steel pistons provide a low coefficient of friction and exceptional fatigue resistance at peak pressures up to 31.5 MPa.

• Low-Noise Silent Operation: By optimizing the swashplate tilt curve and internal unloading groove design, flow pulsations and pressure oscillations are minimized, leading to a significantly quieter hydraulic system.

• Superior Volumetric Efficiency: The compact rotating group and enhanced self-priming capability allow the HY series to maintain volumetric efficiency above 95% across a wide pressure range, reducing energy loss.

Application Areas:

• Heavy-Duty Machine Tools: Provides high-pressure power for hydraulic presses, shearing machines, and bending machines.

• Metallurgical Industry: Used in rolling mill control systems and auxiliary power units for continuous casting machines.

• Plastic Injection Molding: Serves as an efficient power source for small and medium-sized injection molding machinery.

• Hydraulic Test Benches: Acts as the primary pressure source for high-pressure simulation and testing facilities.

Expert Maintenance Tips:

• Initial Priming: Before the first start or after long periods of inactivity, the pump housing must be filled with clean hydraulic oil through the drain port to prevent internal damage from dry friction during startup.

• Inlet Line Integrity: Ensure the suction line is perfectly sealed. Any air ingress (cavitation) will cause severe vibration, high-frequency noise, and rapid destruction of the valve plate.

• Fluid Cleanliness Standards: We recommend maintaining hydraulic fluid at NAS Grade 9 or better. Regularly replace suction filters to prevent hard particles from scoring the piston and cylinder surfaces.