HY107Y-RP HENGYUAN Variable Piston Pump 315 Bar

Product Overview

The HENGYUAN HY Series is a family of swash-plate variable axial piston pumps designed for open-circuit hydraulic systems.

The official HENGYUAN technical documentation specifies a displacement range of 10–320 mL/rev, with 315 bar nominal pressure and 400 bar peak pressure. The series is available with multiple displacement-control concepts, including constant-power, pressure-compensated, proportional and manual configurations.

The models covered here are:

• HY107Y-RP
• HY125Y-RP
• HY160Y-RP
• HY250Y-RP

The original title uses 160Y-RP. For a technically correct product listing, this should be standardized as HY160Y-RP, following the official HENGYUAN ordering-code structure.

The Y code represents Constant Power Control, R indicates clockwise rotation when viewed from the shaft end, and P specifies a metric parallel-key shaft.

For replacement applications, our engineering process focuses on in-place interchangeability, including dimensional matching, shaft configuration, rotation, hydraulic connections and controller characteristics. Each replacement unit can be subjected to 100% simulated working-condition testing before shipment.

Technical Specifications

HY107Y-RP

• Manufacturer: HENGYUAN
• Series: HY
• Type: Variable displacement axial piston pump
• Design: Swash-plate axial piston
• Circuit: Open circuit
• Displacement: 107 mL/rev
• Nominal Pressure: 315 bar
• Peak Pressure: 400 bar
• Intermittent Working Pressure: 350 bar, limited to 10% of the duty cycle
• Control: Y — Constant Power Control
• Rotation: R — clockwise viewed from shaft end
• Shaft: P — metric parallel keyed shaft
• Theoretical Flow at 1,500 rpm / 315 bar: 160.5 L/min
• Theoretical Drive Power at 1,500 rpm / 315 bar: 84.3 kW
• Theoretical Drive Torque: 536 Nm
• Maximum Speed: Not separately specified in the official HY technical document
• Weight: Not specified for the individual model in the official HY technical document.

HY125Y-RP

• Displacement: 125 mL/rev
• Nominal Pressure: 315 bar
• Peak Pressure: 400 bar
• Intermittent Working Pressure: 350 bar
• Control: Y — Constant Power Control
• Rotation: Clockwise
• Shaft: Metric parallel key
• Theoretical Flow at 1,500 rpm / 315 bar: 187.5 L/min
• Theoretical Drive Power: 98.4 kW
• Theoretical Drive Torque: 626 Nm
• Maximum Speed: Not separately published in the official HY documentation
• Weight: Not specified in the official HY documentation.

HY160Y-RP

• Displacement: 160 mL/rev
• Nominal Pressure: 315 bar
• Peak Pressure: 400 bar
• Intermittent Working Pressure: 350 bar
• Control: Y — Constant Power Control
• Rotation: Clockwise
• Shaft: Metric parallel key
• Theoretical Flow at 1,500 rpm / 315 bar: 240 L/min
• Theoretical Drive Power: 126 kW
• Theoretical Drive Torque: 802 Nm
• Maximum Speed: Not separately published in the official HY documentation
• Weight: Not specified in the official HY documentation.

HENGYUAN’s published application material specifically identifies HY107Y-RP and HY160Y-RP for multi-pump hydraulic systems used on marine deck cranes.

HY250Y-RP

• Displacement: 250 mL/rev
• Nominal Pressure: 315 bar
• Peak Pressure: 400 bar
• Intermittent Working Pressure: 350 bar
• Control: Y — Constant Power Control
• Rotation: Clockwise
• Shaft: Metric parallel key
• Theoretical Flow at 1,500 rpm / 315 bar: 375 L/min
• Theoretical Drive Power: 196.9 kW
• Theoretical Drive Torque: 1,253 Nm
• Maximum Speed: Not separately published in the official HY documentation
• Weight: Not specified in the official HY documentation.

A publicly available industrial-equipment specification also lists HY250Y-RP at 250 mL/rev and 31.5 MPa, but this external application document is not used to establish the pump’s maximum speed or manufacturer-rated limits.

Key Technical Advantages

1. Swash-Plate Variable Axial-Piston Design

The HY Series uses a swash-plate axial-piston architecture in an open circuit. Changing the swash-plate angle changes piston stroke and therefore pump displacement, allowing hydraulic output to adapt to system demand.

2. Constant-Power Regulation

The Y regulator is designed as a constant-power control. According to HENGYUAN’s documentation, outlet flow changes approximately along a constant-power curve as outlet pressure changes. This helps prevent the prime mover from being overloaded as hydraulic pressure rises.

3. 315 Bar Nominal / 400 Bar Peak Pressure

The official HY documentation specifies 315 bar nominal pressure, 400 bar peak pressure, and 350 bar intermittent pressure limited to 10% of the duty cycle. These ratings should be kept clearly separated in engineering specifications and marketing copy.

4. Broad Displacement Range

The HY family covers 10–320 mL/rev, allowing the same basic platform concept to address different flow requirements. The 107, 125, 160 and 250 mL/rev configurations cover medium-to-large open-circuit hydraulic systems.

5. Compact Pump Architecture

HENGYUAN lists compact dimensions and high power-to-weight characteristics among the HY Series features and uses an integrated pump-body/housing design.

6. SAE-Style Hydraulic Connections

The official documentation specifies compatibility with SAE-style oil-port flange design and mounting arrangements shared with the CY pump family. This can be advantageous for replacement projects, although actual interchangeability must still be checked against the complete installation dimensions.

7. Strong Suction-Side Design Requirements

The HY technical documentation specifies a minimum absolute inlet pressure of 0.8 bar and provides installation guidance covering suction height, immersion depth and inlet piping. Proper suction design is therefore a critical part of pump reliability rather than an afterthought.

Application Areas

HY107Y-RP / HY160Y-RP

HENGYUAN’s published engineering material specifically identifies these models for multi-pump systems on marine deck cranes, supplying hoisting, luffing and slewing circuits.

Typical applications include:

• Marine deck cranes
• Hydraulic cargo-handling equipment
• Heavy-duty hydraulic power units
• Anchor windlasses and mooring winches
• Industrial hydraulic systems

HY125Y-RP

The 125 mL/rev configuration can be considered for:

• Hydraulic power units
• Forging and forming machinery
• Metallurgical equipment
• Heavy industrial machinery
• Multi-actuator open-circuit systems

Final selection must be based on required flow, pressure, drive power and control characteristics.

HY250Y-RP

The 250 mL/rev configuration provides a theoretical 375 L/min at 1,500 rpm and 315 bar, making it suitable for high-flow industrial hydraulic applications such as:

• Large hydraulic shears
• Heavy forging machinery
• Metallurgical equipment
• High-flow hydraulic power units
• Large industrial hydraulic circuits

Expert Maintenance Tips

1. Fill the Pump Housing Before Commissioning

The HENGYUAN installation documentation requires the pump housing to be filled with hydraulic fluid before commissioning and kept filled during operation.

2. Protect the Suction Circuit

The minimum absolute inlet pressure specified by HENGYUAN is 0.8 bar. When the pump is mounted above the reservoir, suction height, pipe restriction and minimum fluid level must all be checked.

3. Control Case-Drain Pressure

The maximum permissible case-drain pressure is specified as no more than 0.5 bar above inlet pressure and not more than 2 bar absolute. Excessive drain-line restriction can therefore create avoidable seal and internal-pressure problems.

4. Maintain Accurate Shaft Alignment

HENGYUAN specifies installation accuracy within 0.05 mm for concentricity/verticality and recommends flexible couplings to avoid transmitting excessive radial forces to the pump shaft and bearings.

5. Do Not Treat 1,500 rpm as the Maximum Speed

The official HY performance table is calculated at 1,500 rpm and 315 bar. It does not publish a separate maximum rated speed for HY107Y-RP, HY125Y-RP, HY160Y-RP or HY250Y-RP. Therefore, 1,500 rpm should be described as the reference performance condition, not as a maximum speed rating.

6. Use the Correct Hydraulic Fluid and Cleanliness Level

HENGYUAN recommends L-HM32, L-HM46 and L-HM68 anti-wear hydraulic fluids, with a normal operating temperature of 15–65°C, an ideal oil temperature around 50 ± 4°C, and a recommended operating viscosity range of 27–43 mm²/s. The documentation recommends controlling oil cleanliness to NAS 10 or 19/16 or better.

For large-displacement pumps such as HY160Y-RP and HY250Y-RP, contamination control is particularly important because wear of the cylinder block, valve plate, piston/shoe assemblies and other precision interfaces directly affects volumetric performance, heat generation and pressure stability.

Engineering Verification Summary

Verified manufacturer: HENGYUAN / Jiangsu Hengyuan Hydraulic Co., Ltd.
Series: HY Variable Displacement Axial Piston Pump
Circuit: Open Circuit
Displacement range: 10–320 mL/rev
Nominal pressure: 315 bar
Peak pressure: 400 bar
Intermittent pressure: 350 bar, up to 10% duty cycle
Y control: Constant Power Control
R: Clockwise rotation
P: Metric parallel-key shaft
Reference performance condition: 1,500 rpm / 315 bar
Individual maximum speed: Not published in the reviewed official HY technical document
Individual pump weight: Not published in the reviewed official HY technical document.