HY Series Hydraulic Piston Pump | HY10Y-RP HY25Y-RP HY63Y-RP | High Pressure

The HY Series (HY…Y-RP) from LIC Hydraulic is a premier line of Fixed Displacement Axial Piston Pumps designed for high-pressure industrial applications. Known for their ruggedness and high reliability, these pumps are the workhorses of metal-forming and metallurgy hydraulic systems. Covering displacements from HY10Y-RP to HY71Y-RP, we guarantee 100% mechanical interchangeability with original industrial standards. Each unit undergoes 100% simulated load testing to ensure it maintains peak performance under a constant pressure of $31.5\text{ MPa}$.

Technical Specifications (Bulleted List)

• Series: HY Series (RP Fixed Type)

• Displacement Range: $10, 16, 25, 32, 40, 45, 55, 63, 71\text{ cm}^3\text{/rev}$

• Nominal Pressure: $31.5\text{ MPa}$ ($4568\text{ psi}$)

• Peak Pressure: $35.0\text{ MPa}$ ($5075\text{ psi}$)

• Rated Speed: $1500\text{ rpm}$

• Max Speed: Up to $2500\text{ rpm}$ (specific to model)

• Housing Material: High-strength Grey Cast Iron

• Mounting: Flange mounting per industrial standards

Key Technical Advantages

• Precision Valve Plate Interface: The valve plate and cylinder block are precision-lapped to micron tolerances. This, combined with advanced anti-friction coatings, ensures minimal internal bypass and a volumetric efficiency exceeding $92\%$.

• Hydrostatic Slipper Design: The piston slippers feature a hydrostatic balance design that minimizes physical contact with the swashplate, significantly reducing heat generation and mechanical wear during continuous high-pressure cycles.

• Enhanced Vibration Damping: The heavy-walled cast iron housing is designed to absorb fluid-borne noise and mechanical vibrations, making it the ideal choice for stable power delivery in metallurgy and mining environments.

• High Contamination Tolerance: Compared to sensitive variable pumps, the HY fixed series is more resilient to minor fluid particulates, offering a longer service life in harsh operating conditions with standard maintenance.

Application Areas

• Metallurgical Equipment: Tilting systems for furnaces, continuous casting machines, and rolling mill auxiliaries.

• Forging & Pressing: Hydraulic presses, balers, and heavy-duty bending machines.

• Mining & Excavation: Hoist systems and lubrication units for large-scale mining equipment.

• Marine Engineering: Hydraulic power for winches, capstans, and steering gear.

Expert Maintenance Tips

• Mandatory Case Priming: Before the initial start, the pump case must be filled with filtered hydraulic oil through the highest drain port. Running dry for even a few seconds will result in catastrophic failure of the piston assembly.

• Case Drain Management: Ensure the drain line is plumbed directly to the reservoir without filters to keep case pressure below $0.1\text{ MPa}$. High case pressure is the primary cause of shaft seal blowout.

• Fluid Maintenance: Use high-quality anti-wear hydraulic oil (e.g., ISO VG 46/68). Maintaining a filtration level of 20 microns or better is essential to protect the high-precision piston-to-bore interface.