Piston pump
HENGYUHANG Bomba variable a pistones axiales HYH7VO Series
HENGYUHANG HYH7VO Series 63 is a high-pressure bent-axis axial piston variable pump engineered with a tapered piston rotary group for open-circuit hydrostatic drives, delivering high volumetric efficiency and robust continuous duty across heavy-duty industrial and mobile machinery.
| Applications
Designed for primary open-loop hydraulic circuits in mobile construction machinery, excavators, mobile cranes, concrete pump trucks, drilling rigs, and heavy-duty stationary industrial presses where variable displacement, stepless flow regulation from qV max to qV min = 0, and continuous fatigue-resistant 350 bar performance are required.
| Key Technical Specifications
Product Model: HYH7VO Series 63 (Sizes 28, 55, 80, 107, 160)
Brand Replacement: Bosch Rexroth A7VO Series 63 (Sizes 28, 55, 80, 107, 160; open circuit), OEM or as requested.
Displacement: 28.1 / 54.8 / 80.0 / 107.0 / 160.0 cm³/rev
Rotation Direction: Clockwise (R) or Counter-clockwise (L), viewed from shaft end
Speed Range: Nominal rating nmax1 1,900–3,150 rpm (nmax perm up to 2,850–4,750 rpm)
Peak Pressure: Nominal pressure pN = 350 bar / Maximum peak pressure pmax = 400 bar (315 / 350 bar with radial shaft loading)
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| Overview of HENGYUHANG HYH7VO Series 63 Hydraulic Pumps
The HENGYUHANG HYH7VO Series 63 is an open-circuit, bent-axis axial variable displacement pump featuring a heavy-duty spherical cylinder block and tapered piston rotary assembly. Designed to serve as a seamless 1:1 drop-in replacement for the global Bosch Rexroth A7VO Series 63 line across medium-to-large displacements (sizes 28, 55, 80, 107, and 160), this unit converts mechanical drive torque into infinitely variable hydraulic fluid power.
Output flow is directly proportional to drive speed and swiveling angle, allowing stepless regulation from maximum displacement qV max all the way down to zero flow (qV min = 0). Featuring an ISO 3019-2 4-hole mounting pattern, precision-ground DIN 5480 splined shafts or DIN 6885 keyed parallel shafts, high-pressure SAE J518 code 61/62 service ports, and an extensive family of modular controllers (LR power controls, DR/DRG/DRS pressure/load-sensing cut-offs, HD hydraulic pilot regulators, and EP proportional electric controls), the HYH7VO delivers zero-modification field interchangeability, extended operating service life, and optimized overall hydraulic efficiency.
| Dimension of HENGYUHANG HYH7VO Series 63 Hydraulic Pumps
| Mechanical Installation Interface Specifications
| Size (HYH7VO) | 4-Hole Mounting Flange (ISO 3019-2) | Splined Shaft (DIN 5480) | Parallel Keyed Shaft (DIN 6885) | Working Pressure Port B / A (SAE J518) | Suction Port S (SAE J518) | Air Bleed Port R (DIN 3852) | Drain / Flushing Port U (DIN 3852) |
|---|---|---|---|---|---|---|---|
| HYH7VO28 | Spigot Ø100 mm, Outer Ø125 mm | W25×1.25×30×18×9g | AS8×7×40 (Thread M8×1.25) | 3/4 in (Metric thread M10×1.5, 17 deep) | 1 1/2 in (Metric thread M12×1.75, 20 deep) | M18×1.5 (140 Nm) | M16×1.5 (100 Nm) |
| HYH7VO55 | Spigot Ø125 mm, Outer Ø160 mm | W30×2×30×14×9g | AS8×7×50 (Thread M12×1.75) | 3/4 in (Metric thread M10×1.5, 17 deep) | 2 in (Metric thread M12×1.75, 20 deep) | M18×1.5 (140 Nm) | M18×1.5 (140 Nm) |
| HYH7VO80 | Spigot Ø140 mm, Outer Ø180 mm | W35×2×30×16×9g | AS10×8×56 (Thread M12×1.75) | 1 in (Metric thread M12×1.75, 17 deep) | 2 1/2 in (Metric thread M12×1.75, 20 deep) | M18×1.5 (140 Nm) | M18×1.5 (140 Nm) |
| HYH7VO107 | Spigot Ø160 mm, Outer Ø200 mm | W40×2×30×18×9g | AS12×8×63 (Thread M12×1.75) | 1 in (Metric thread M12×1.75, 17 deep) | 2 1/2 in (Metric thread M12×1.75, 20 deep) | M18×1.5 (140 Nm) | M18×1.5 (140 Nm) |
| HYH7VO160 | Spigot Ø180 mm, Outer Ø224 mm | W45×2×30×21×9g | AS14×9×70 (Thread M16×2.0) | 1 1/4 in (Metric thread M14×1.5, 19 deep) | 3 in (Metric thread M16×1.5, 24 deep) | M26×1.5 (230 Nm) | M22×1.5 (210 Nm) |
| Auxiliary Control Ports (All Sizes)
Pilot fluid drain port T1: M12×1.5 (plugged, open only on pressure-relief/override circuits; 50 Nm tightening torque).
Gauge / high-pressure measuring port A1: M12×1.5 (Size 28), M14×1.5 (Sizes 55, 80), M16×1.5 (Sizes 107, 160).
Remote control port X1 / external control pressure Y3: M14×1.5 (all sizes).
Load sensing port X4 (on DRS controllers): M14×1.5 (Sizes 55, 80, 107, 160).
| Pump Installation Specifications
| Complete Ordering Code Structure
HYH7V−O−[Size]−[Control]/63 [Rotation]−[Seals][Shaft][Flange][Port]−[Option]
| Position | Code Segment | Available Designations & Options | Technical Description & Functional Purpose |
|---|---|---|---|
| 01 | Axial Piston Unit | HYH7V / A7V | Bent-axis variable displacement design, nominal pressure 350 bar, peak 400 bar |
| 02 | Operating Mode | O | Open-circuit hydrostatic pump drive |
| 03 | Frame Size | 28, 55, 80, 107, 160 | Geometric displacement ratings in cm³/rev (28.1, 54.8, 80.0, 107.0, 160.0) |
| 04 | Control Devices | LR / LRD / LRDH1 / LRH1; DR / DRG / DRS; HD1 / HD2; HD1G / HD2G; EP / EPG | LR = Power controller, with optional pressure cut-off and negative stroke limiter; DR = Pressure controller (standard, remote-controlled, or with load-sensing line); HD1 / HD2 = Hydraulic pilot-pressure related control (positive control, Δp = 10 bar or 25 bar); HD1G / HD2G = Hydraulic pilot-pressure control with remote-controlled pressure cut-off; EP / EPG = Electric proportional control with proportional solenoid (12V / 24V DC) |
| 05 | Series | 63 | Series 6, Index 3 |
| 06 | Direction of Rotation | R, L | Clockwise (R) or Counter-clockwise (L), viewed facing drive shaft |
| 07 | Sealing System | N | NBR (nitrile-butadiene rubber) dynamic seals with FKM shaft seal ring |
| 08 | Drive Shaft Option | Z, P | Z: Splined shaft DIN 5480; P: Parallel keyed cylindrical shaft DIN 6885 |
| 09 | Mounting Flange | B | 4-hole mounting flange conforming to ISO 3019-2 |
| 10 | Service Line Ports | 01 | SAE flange ports B (or A) and suction port S at rear, metric fixing threads |
| 11 | Special Designations | Blank / -S | Standard production version / Special customized shaft or control configuration |
| Reading Your Replacement Code
| Rexroth OEM Model Code | HENGYUHANG Drop-In Code | Displacement | Control Mechanism | Flange & Drive Shaft | Port Location |
|---|---|---|---|---|---|
| A7VO28LRD/63R-NZB01 | HYH7VO28LRD/63R-NZB01 | 28.1 cm³/rev | Power controller + pressure cut-off | ISO 4-bolt Ø100 spigot, DIN 5480 W25 spline | SAE 3/4" rear ports |
| A7VO55DRS/63R-NPB01 | HYH7VO55DRS/63R-NPB01 | 54.8 cm³/rev | Pressure control with load-sensing (LS) | ISO 4-bolt Ø125 spigot, DIN 6885 AS8 keyed | SAE 3/4" rear ports |
| A7VO80LR/63R-NZB01 | HYH7VO80LR/63R-NZB01 | 80.0 cm³/rev | Constant power regulator (LR) | ISO 4-bolt Ø140 spigot, DIN 5480 W35 spline | SAE 1" rear ports |
| A7VO107HD1/63R-NZB01 | HYH7VO107HD1/63R-NZB01 | 107.0 cm³/rev | Hydraulic pilot control (Δp = 10 bar) | ISO 4-bolt Ø160 spigot, DIN 5480 W40 spline | SAE 1" rear ports |
| A7VO160EPG/63R-NZB01 | HYH7VO160EPG/63R-NZB01 | 160.0 cm³/rev | Electric proportional + pressure cut-off | ISO 4-bolt Ø180 spigot, DIN 5480 W45 spline | SAE 1 1/4" rear ports |
Technical Specifications of HENGYUHANG HYH7VO Series (Sizes 28–160)
4.1 Frame Size Performance Matrix (Data at pₐᵦₛ=1 bar at suction port S, mineral oil ρ=0.88 kg/L)
| Performance Parameter | Unit | HYH7VO28 | HYH7VO55 | HYH7VO80 | HYH7VO107 | HYH7VO160 |
|---|---|---|---|---|---|---|
| Max Geometric Displacement (Vgₘₐₓ) | cm³/rev | 28.1 | 54.8 | 80.0 | 107.0 | 160.0 |
| Max Speed at Vgₘₐₓ (nₘₐₓ₁) | rpm | 3,150 | 2,500 | 2,240 | 2,150 | 1,900 |
| Max Speed at Reduced Swivel (nₘₐₓ₂, Vgₘᵢₙ≤0.74⋅Vgₘₐₓ) | rpm | 4,250 | 3,400 | 3,000 | 2,900 | 2,560 |
| Maximum Permissible Speed (nₘₐₓₚₑᵣₘ) | rpm | 4,750 | 3,750 | 3,350 | 3,200 | 2,850 |
| Max Continuous Flow Rate (qVₘₐₓ₁ at nₘₐₓ₁) | L/min | 89 | 137 | 179 | 230 | 304 |
| Max Drive Power (Pₘₐₓ₁ at Δp=350 bar) | kW | 52 | 80 | 105 | 134 | 177 |
| Max Drive Torque (Tₘₐₓ at Δp=350 bar) | Nm | 156 | 305 | 446 | 596 | 891 |
| Drive Shaft Torsional Stiffness (cₘᵢₙ / cₘₐₓ) | Nm/rad | 5,546 / 16,541 | 10,594 / 32,103 | 15,911 / 48,971 | 21,469 / 67,666 | 36,073 / 104,622 |
| Rotary Moment of Inertia (J_TW) | kg·m² | 0.0042 | 0.0042 | 0.0080 | 0.0127 | 0.0253 |
| Angular Acceleration Limit (α) | rad/s² | 35,900 | 31,600 | 24,200 | 19,200 | 15,300 |
| Case Filling Capacity | L | 0.50 | 0.75 | 1.20 | 1.50 | 2.40 |
| Dry Weight (approx.) | kg | 17 | 25 | 40 | 49 | 71 |
4.2 Operating Pressure Boundaries
| Pressure Characteristic | Non-Radial Shaft Drive (Flexible Coupling) | With Radial Shaft Loading (Belt / Pinion) | Note / Operating Limits |
|---|---|---|---|
| Nominal Operating Pressure (pN) | 350 bar (35 MPa) | 315 bar (31.5 MPa) | Continuous fatigue-strength rating according to ISO standards |
| Maximum Peak Pressure (pₘₐₓ) | 400 bar (40 MPa) | 350 bar (35 MPa) | Maximum transient peak duration Δt<0.1 s; cumulative life limits apply |
| Minimum Suction Pressure (pₐᵦₛ ₘᵢₙ at port S) | ≥0.8 bar absolute | ≥0.8 bar absolute | Prevents cavitation damage across open-circuit suction lines |
| Maximum Suction Pressure (pₐᵦₛ ₘₐₓ at port S) | Dependent on drive speed | Dependent on drive speed | In accordance with suction pressure vs. speed curves (RE 92202) |
| Case Drain Permissible Pressure | ≤2.0 bar absolute | ≤2.0 bar absolute | Max continuous case pressure to preserve dynamic FKM shaft seal integrity |
4.3 Hydraulic Fluid & Temperature Operational Limits
| Fluid Characteristic | Permissible Value | Operational Note |
|---|---|---|
| Recommended Fluid Media | Mineral oil (HL, HLP to DIN 51524) | High-grade anti-wear hydraulic oil |
| Optimum Operating Viscosity (νₒₚₜ) | 16 to 36 mm²/s | Optimal balance of mechanical and volumetric efficiency |
| Minimum Viscosity (νₘᵢₙ) | 5 mm²/s | Short-term limit (t≤3 min) at localized maximum port temperature +115 ∘C |
| Maximum Viscosity at Cold Start (νₘₐₓ) | 1,600 mm²/s | Allowed at cold start (p≤30 bar, n≤1,000 rpm, tₘᵢₙ=−40 ∘C); warm up under zero load |
| Permissible Fluid Temperature Range | −25 ∘C to +90 ∘C | Extended localized drainage limit up to +115 ∘C |
| Cleanliness Class | ISO 4406 Class 20/18/15 | NAS 1638 Class 9 achieved via 10 μm nominal filtration |
| Environmentally Friendly / Synthetic Fluids | HETG, HEES, HEPG | Long Life bearing execution recommended; observe limits in RE 90221 / 90223 |
| Prohibited Fluids | Water-containing HFA fluids | Strictly prohibited; unit not rated for high-water media |
Product Advantages
Heavy-Duty Bent-Axis Rotary Group
Employs spherical valve plates and tapered pistons designed for robust self-priming capability, low friction, and exceptional mechanical-hydraulic efficiency across varying operating angles.
Stepless Infinite Displacement Adjustment
Delivers smooth, stepless flow regulation from maximum delivery qVₘₐₓ down to full zero-swivel idle (qVₘᵢₙ=0), minimizing standby power consumption in demanding open circuits.
Broad Modular Control System
Seamlessly integrates with power regulators (LR/LRD/LRH1), remote-controlled pressure limiters (DR/DRG), load-sensing governors (DRS), and electro-hydraulic proportional actuators (EP/HD).
Extended Bearing Durability & Long Life Options
Robust double-tapered roller bearing configurations withstand high radial and axial thrust loads; optional Long Life bearings are available for low-lubricity fluids and severe duty cycles.
Precision 1:1 OEM Drop-In Compatibility
Exact adherence to ISO 3019-2 4-bolt flange spigots, DIN 5480 involute splines, DIN 6885 keys, and metric SAE port drillings ensures zero re-engineering during Rexroth A7VO field replacements.
Superior Power-to-Weight Ratio
Compact cast envelope delivers up to 177 kW continuous drive power and 891 Nm torque in a rigid, low-noise chassis engineered to withstand peak pressure spikes of 400 bar.
Interchangeability & Cross Reference
6.1 Direct Replacement Matrix: Bosch Rexroth A7VO to HENGYUHANG HYH7VO (Sizes 28–160)
| Replacement Target | Rexroth Series Designation | Displacement | Mounting Standard | Shaft End Spec | HENGYUHANG Direct Match |
|---|---|---|---|---|---|
| A7VO28 | Series 63 (Open Circuit) | 28.1 cm³/rev | ISO 3019-2 4-Hole Ø100 mm | DIN 5480 W25 or Keyed AS8 | HYH7VO28 |
| A7VO55 | Series 63 (Open Circuit) | 54.8 cm³/rev | ISO 3019-2 4-Hole Ø125 mm | DIN 5480 W30 or Keyed AS8 | HYH7VO55 |
| A7VO80 | Series 63 (Open Circuit) | 80.0 cm³/rev | ISO 3019-2 4-Hole Ø140 mm | DIN 5480 W35 or Keyed AS10 | HYH7VO80 |
| A7VO107 | Series 63 (Open Circuit) | 107.0 cm³/rev | ISO 3019-2 4-Hole Ø160 mm | DIN 5480 W40 or Keyed AS12 | HYH7VO107 |
| A7VO160 | Series 63 (Open Circuit) | 160.0 cm³/rev | ISO 3019-2 4-Hole Ø180 mm | DIN 5480 W45 or Keyed AS14 | HYH7VO160 |
6.2 Common Control Assembly Cross Reference
| Target Rexroth Function | OEM Controller Suffix | HENGYUHANG Equivalent Code | Functional Characteristic |
|---|---|---|---|
| Constant Power Regulation | LR | HYH-LR | Maintains constant input drive power curve against rising working pressure |
| Power Control + Cut-Off | LRD | HYH-LRD | Power regulation combined with maximum working pressure limiter |
| Pressure Governor | DR | HYH-DR | Regulates pump displacement to hold constant preset system pressure |
| Remote Pressure Cut-off | DRG | HYH-DRG | Remote differential pressure regulation via external pilot valve |
| Load-Sensing System | DRS | HYH-DRS | Matches pump delivery and pressure to fluctuating load demand (Δp=14 bar) |
| Hydraulic Pilot Control | HD1 / HD2 | HYH-HD1 / HYH-HD2 | Stepless pilot pressure displacement regulation (Δp=10 bar or 25 bar) |
| Electric Proportional | EP / EPG | HYH-EP / HYH-EPG | Current-controlled proportional displacement via 12V/24V DC solenoids |
Brand Replacement
Bosch Rexroth: Primary 1:1 direct interchangeability for A7VO Series 63 open-circuit pumps.
OEM Custom Replacements: Manufactured upon request to match customer port layouts, control characteristics, and shaft splines.
Applications
Excavators and Mobile Earthmoving: Main hydraulic open-circuit pump supplying boom, arm, bucket, and auxiliary attachment circuits under heavy cyclic loading.
Mobile Cranes and Lifting Machinery: Precision hoisting, telescoping, and slewing circuits requiring smooth pilot-controlled displacement from zero flow to maximum output.
Concrete Pump Trucks and Placing Booms: Powers high-pressure pumping cylinders and placing booms with rapid dynamic swiveling response and thermal endurance.
Drilling Rigs and Foundation Equipment: Feeds rotary drive motors and feed cylinders requiring continuous 350 bar rated pressure and constant power control.
Heavy Industrial Hydraulic Presses: Primary pressure supply for metal forming, stamping, punching, and baling presses requiring long-life continuous operation.
Forestry and Agricultural Harvesters: Severe-duty open-loop circuits powering heavy cutting heads, log loaders, and tractive implements.
Packaging & Shipping
| Packaging Layer | Specification & Protection Material | Safety Standard |
|---|---|---|
| Inner Protection | Corrosion-inhibiting VCI plastic wrap, desiccants, and heavy-duty port thread plugs | Prevents moisture, atmospheric corrosion, and debris contamination |
| Shock Cushioning | Custom-molded high-density expanded polyethylene (EPE) foam enclosure | Absorbs severe multi-axis transit impacts and protects shaft extensions |
| Outer Enclosure | ISPM-15 export-certified solid fumigation-free engineered wooden crate | Structural reinforcement for global ocean, air, and multimodal handling |
| Logistics Options | Express Courier (DHL, FedEx, UPS), Air Freight, LCL/FCL Ocean Cargo, DDP door-to-door | Dispatch in 48–72 hours for standard configurations; tailored tracking provided |
Why Choose Hengyuhang?
Direct Factory Precision Manufacturing & CNC Excellence: State-of-the-art multi-axis CNC machining centers, precision spherical grinding equipment, and sub-micron gear and bearing fitment (Ra<0.2 μm) guarantee superior rotary group alignment and low internal leakage.
100% Full-Cycle Multi-Parameter Factory Inspection: Every HYH7VO pump undergoes automated test-bench trials verifying volumetric efficiency (>94%), continuous and peak pressure hold at 400 bar, internal case leakage limits, response hysteresis, and vibration/noise spectra prior to dispatch.
Seamless 1:1 OEM Drop-In Interchangeability: Engineered to match European DIN, ISO 3019-2, and SAE standards down to the millimeter, allowing immediate replacement of Bosch Rexroth A7VO units with zero pipe rework or bracket modification.
Flexible Engineering Customization & Rapid Prototyping: In-house hydraulic engineering team provides tailored control-valve calibrations, special shaft profiles, auxiliary flushing ports, and rapid prototype turnarounds with minimal MOQ requirements.
Robust Supply Chain, Extensive Inventory & Fast Global Dispatch: Continuous inventory of finished cast bodies, bearing kits, rotary groups, and modular controllers enables standardized orders to ship globally within 48 to 72 hours.
12-Month Comprehensive Warranty & Lifetime Technical Support: All units are backed by an unconditional 12-month factory warranty, 24-hour drawing verification service, and lifetime engineering consultation from certified fluid power specialists.
HENGYUHANG Axial Piston Variable Pump HYH7VO Series 63 (Heavy-Duty Bent-Axis Open-Circuit Hydraulic Pump, 28.00~160.00 cm³/rev / Up to 500.00 cm³/rev) is a high-pressure, high-efficiency axial piston variable displacement pump featuring a heavy-duty tapered piston rotary group in bent-axis design, engineered specifically for hydrostatic drives in open-circuit industrial and mobile hydraulic systems. Manufactured by Quanzhou Hengyuhang Power Technology Co., Ltd. as an engineered direct-fit replacement for the Rexroth A7VO Series 63 product family, the HYH7VO Series incorporates robust spherical valve plates, precision-ground tapered pistons with heavy-duty piston rings, high-rigidity bent-axis housings, and an advanced bearing arrangement engineered for extreme fatigue resistance under severe cyclic pressure loading. The pump operates at a nominal continuous working pressure of 350 bar (35 MPa / 5,075 psi) and a maximum peak pressure of 400 bar (40 MPa / 5,800 psi), delivering infinitely variable output flow proportional to drive speed and swivel angle from maximum displacement down to zero flow (qv min = 0). Spanning standardized frame sizes across 28, 55, 80, 107, and 160 cm³/rev (with extended high-capacity frames 250, 355, and 500 cm³/rev), the HYH7VO Series achieves high self-priming speeds up to 3150 rpm, exceptional power density, and superior overall efficiency (ηt > 92%). Available with an extensive suite of control devices—including hyperbolic power controllers (LR, LRD, LRDH1), constant pressure controllers with remote and load-sensing functions (DR, DRG, DRS), pilot-pressure related hydraulic controls (HD1, HD2), and proportional electric controls (EP, EPG)—as well as ISO 3019-2 4-bolt mounting flanges, DIN 5480 involute splined shafts, and SAE J518 Code 62 high-pressure ports, the HYH7VO Series provides heavy equipment builders and maintenance engineers with an uncompromising drop-in replacement that delivers OEM-grade reliability, extended operational life, and seamless hydraulic interchangeability.
| Applications
The HYH7VO Series bent-axis variable displacement pump is purpose-engineered for high-pressure, shock-loaded, and high-duty-cycle open-circuit hydraulic machinery across mobile and stationary industrial sectors:
Heavy Forging, Stamping & Extrusion Presses: Serves as the primary variable-flow hydraulic generator for metal forming, hydraulic stamping, scrap balers, and aluminum extrusion press main cylinders.
Metallurgical Steel Mills & Foundry Machinery: Powers continuous casting lines, ladle tilting mechanisms, walking beam furnaces, and high-pressure roll nip positioning systems.
Marine Deck Machinery, Cranes & Dredgers: Provides continuous high-pressure fluid power for anchor winches, offshore pedestal cranes, dynamic positioning systems, and trailing suction hopper dredgers.
Tunnel Boring Machines (TBM) & Mining Shovels: Drives cutterhead auxiliary systems, rock drill thrust cylinders, segment erector circuits, and heavy surface mining hydraulic excavators.
Mobile Construction Cranes & Concrete Boom Pumps: Supplies infinitely variable hydraulic fluid for crawler crane hoists, telescopic boom extension cylinders, and mobile concrete placer pumping units.
Oilfield Drilling & Well Servicing Rigs: Drives top drive hydraulic auxiliaries, hydraulic power tongs, mud pump supercharging units, and coiled tubing injectors.
| Key Specifications Overview
| Parameter | Hengyuhang HYH7VO Series 63 Engineering Specification |
|---|---|
| Pump Architecture | Variable Axial Piston Pump with Tapered Piston Rotary Group in Bent-Axis Design for Open Circuits |
| Series & Generation | HYH7VO Series 63 (Direct interchange with Rexroth A7VO Series 63) |
| Primary Frame Displacement Range | Sizes 28, 55, 80, 107, 160 cm³/rev (Extended industrial range covers 250, 355, 500 cm³/rev) |
| Nominal Working Pressure (pN) | 350 bar (35 MPa / 5,075 psi) continuous fatigue-rated design pressure (315 bar with external radial shaft load) |
| Maximum Peak Operating Pressure (pmax) | 400 bar (40 MPa / 5,800 psi) short-term intermittent peak threshold (t < 0.1 s; 350 bar with radial load) |
| Flow Delivery Characteristics | Proportional to drive speed and displacement; steplessly and infinitely variable from qv max to qv min = 0 |
| Rotational Speed Range (at Vg max) | Self-priming nominal speed n_max1: 1900 rpm (Size 160) to 3150 rpm (Size 28); Limiting speed up to 4750 rpm |
| Permissible Suction Inlet Pressure (Port S) | pabs min = 0.8 bar absolute continuous self-priming pressure at nominal speed without cavitation |
| Case Drain Pressure Rating (Port T1 / R) | Continuous average: ≤ 3.0 bar absolute; Peak case pressure: ≤ 6.0 bar abs (at reduced speed); Spikes < 10 bar (t < 0.1 s) |
| Case Drain Fluid Design | Case chamber internally connected to suction chamber (R-ports plugged); T1 drain required for DR/LRD controls |
| Rotary Group & Tapered Piston Design | Bent-axis drive shaft with integral driving flange; one-piece tapered pistons fitted with dual sealing compression rings |
| Bearing System & Service Life | Heavy-duty preloaded angular contact tapered roller bearing package; Optional Long-Life (L) bearings for high-duty fluids |
| Mounting Flange Standard | Code B: ISO 3019-2 4-hole metric flange (Size 28: Ø100 h8; Size 55: Ø125 h8; Size 80: Ø140 h8; Size 107: Ø160 h8; Size 160: Ø180 h8) |
| Drive Shaft Configurations | Code Z: Involute splined shaft DIN 5480; Code P: Cylindrical parallel keyed shaft DIN 6885 |
| Service Line Port Standard (Port B / A) | SAE J518 Code 62 high-pressure 400 bar 4-bolt split flange ports (metric fixing threads DIN 13) at rear face |
| Suction Port Standard (Port S) | SAE J518 Code 61 standard-pressure 4-bolt split flange suction port (metric fixing threads DIN 13) at rear face |
| Sealing Material System | Code N: Premium FKM fluorocarbon shaft seal ring (-25°C to +115°C) with NBR housing O-rings (Cold start NBR down to -40°C) |
| Direction of Rotation | Clockwise (Code R: flow S to B) or Counter-Clockwise (Code L: flow S to A), viewed facing input drive shaft |
| Hydraulic Fluid Compatibility | Mineral oils (DIN 51524 HLP); Environmentally acceptable fluids (HEES, HEPG); Water-glycol / HF fluids (observe limits) |
| Operating Viscosity Range | Optimum: νopt = 16 to 36 mm²/s; Minimum: νmin = 5 mm²/s (t < 3 min, max +115°C); Maximum: νmax = 1600 mm²/s (cold start) |
| Fluid Cleanliness Standard | ISO 4406 Class 20/18/15 minimum (Class 19/17/14 required for high operating temperatures 90°C~115°C) |
| Technical Performance Matrix Across Available Sizes
| Model Number (Hengyuhang Series) | Displacement Vg max (cm³) | Drive Speed Limits (rpm) | Max. Flow qv max1 @ n_max1 (L/min) | Power P max1 @ 350 bar (kW) | Torque T max @ 350 bar (Nm) | Rotary Stiffness (Nm/rad) | Inertia J_TW (kg·m²) | Angular Accel. α max (rad/s²) | Case Fill (L) | Mass (kg) | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Nominal n_max1 | @ 0.74 Vg n_max2 | Permissible n_perm | c_min (Vg max) | c_max (0.5 Vg) | |||||||||
| Primary Production Frame Range: HYH7VO Series 63 (Sizes 28 to 160) | |||||||||||||
| HYH7VO-28 | 28.1 | 3150 | 4250 | 4750 | 89 | 52 | 156 | 5546 | 16541 | 0.0042 | 35900 | 0.50 | 17 |
| HYH7VO-55 | 54.8 | 2500 | 3400 | 3750 | 137 | 80 | 305 | 10594 | 32103 | 0.0042 | 31600 | 0.75 | 25 |
| HYH7VO-80 | 80.0 | 2240 | 3000 | 3350 | 179 | 105 | 446 | 15911 | 48971 | 0.0080 | 24200 | 1.20 | 40 |
| HYH7VO-107 | 107.0 | 2150 | 2900 | 3200 | 230 | 134 | 596 | 21469 | 67666 | 0.0127 | 19200 | 1.50 | 49 |
| HYH7VO-160 | 160.0 | 1900 | 2560 | 2850 | 304 | 177 | 891 | 36073 | 104622 | 0.0253 | 15300 | 2.40 | 71 |
| Extended Heavy Industrial Frames: HYH7VO Series 63 (Sizes 250 to 500) | |||||||||||||
| HYH7VO-250 | 250.0 | 1500 | — | 1800 | 375 | 219 | 1391 | 59500 | 181000 | 0.0610 | 10000 | 3.00 | 102 |
| HYH7VO-355 | 355.0 | 1320 | — | 1600 | 469 | 273 | 1978 | 74800 | 262000 | 0.1020 | 8300 | 5.00 | 173 |
| HYH7VO-500 | 500.0 | 1200 | — | 1500 | 600 | 350 | 2785 | 115000 | 391000 | 0.1780 | 5500 | 7.00 | 234 |
| Control Device Options & Operating Characteristics
| Control Code | Functional Designation | Operational Description & Characteristic Features |
|---|---|---|
| LR / LRD | Hyperbolic Power Controller (LR) with Pressure Cut-Off (LRD) | Maintains constant drive power at constant speed along a hyperbolic power curve (p × Vg = constant). As operating pressure rises, displacement swivels back smoothly to prevent prime mover overload. Version LRD integrates a pilot-operated pressure cut-off valve that overrides power regulation when reaching maximum system pressure limit. |
| LRDH1 / LRH1 | Power Controller with Pressure Cut-Off & Stroke Limiter | Combines hyperbolic power regulation and pressure cut-off with a negative hydraulic stroke limiter (differential control pressure Δp = 25 bar). Allows external pilot pressure signal to dynamically de-stroke displacement below the power curve limit. |
| DR / DRG / DRS | Pressure Controller (DR), Remote Controlled (DRG) & Load Sensing (DRS) | Code DR maintains constant working pressure by swiveling pump back to zero flow when preset pressure is reached. Code DRG allows remote pressure adjustment via external relief valve connected to port X. Code DRS adds load-sensing differential control (constant flow regardless of changing load pressures). Requires case drain line from port T1 to tank. |
| HD1 / HD2 / HDG | Hydraulic Control, Pilot-Pressure Related (Positive Control) | Stepless displacement adjustment proportional to external hydraulic pilot pressure applied at port X1. Positive control: zero pilot pressure corresponds to zero displacement (Vg min = 0). Code HD1 features pilot differential Δp = 10 bar; Code HD2 features Δp = 25 bar. Code HD1G / HD2G incorporates remote pressure cut-off protection. |
| EP / EPG | Electric Proportional Solenoid Control (Positive Control) | Stepless displacement adjustment proportional to an electrical command current supplied to a proportional solenoid (12 V DC or 24 V DC). Zero current corresponds to zero displacement (Vg min = 0). Code EPG integrates an additional remote pressure cut-off override for fail-safe hydraulic protection. |
| Mounting Flange, Shaft and Port Specifications (Sizes 28 to 160)
| Frame Size | ISO 3019-2 4-Hole Flange (Code B) | Drive Shaft Options (Code Z / Code P) | Fluid Port Connections (SAE J518 & DIN 3852) |
|---|---|---|---|
| HYH7VO-28 | Centering Pilot: Ø100 mm (-0.022 mm, h8); Pitch Circle: Ø125 mm; 4 × Ø11.0 mm holes; Flange Width: 118 × 118 mm | Spline Z: DIN 5480 W25×1.25×30×18×9g (ext. 42 mm); Keyed P: DIN 6885 AS8×7×40 (shaft Ø25 mm k6, ext. 42 mm) | Port B/A (Pressure): SAE J518 Code 62 3/4 in (400 bar, M10×1.5, 17 mm deep); Port S (Suction): SAE J518 Code 61 1 1/2 in (M12×1.75, 20 mm deep); U (Flushing): M16×1.5; R (Bleed): M18×1.5; A1 (Gauge) & T1 (Drain): M12×1.5; X3: M12×1.5; Y3: M14×1.5 |
| HYH7VO-55 | Centering Pilot: Ø125 mm (-0.025 mm, h8); Pitch Circle: Ø160 mm; 4 × Ø13.5 mm holes; Flange Width: 150 × 150 mm | Spline Z: DIN 5480 W30×2×30×14×9g (ext. 50 mm); Keyed P: DIN 6885 AS8×7×50 (shaft Ø30 mm k6, ext. 50 mm) | Port B/A (Pressure): SAE J518 Code 62 3/4 in (400 bar, M10×1.5, 17 mm deep); Port S (Suction): SAE J518 Code 61 2 in (M12×1.75, 20 mm deep); U (Flushing): M18×1.5; R (Bleed): M18×1.5; A1 (Gauge): M14×1.5; T1 (Drain): M12×1.5; X3: M14×1.5; Y3: M14×1.5 |
| HYH7VO-80 | Centering Pilot: Ø140 mm (-0.025 mm, h8); Pitch Circle: Ø180 mm; 4 × Ø13.5 mm holes; Flange Width: 165 × 165 mm | Spline Z: DIN 5480 W35×2×30×16×9g (ext. 56 mm); Keyed P: DIN 6885 AS10×8×56 (shaft Ø35 mm k6, ext. 56 mm) | Port B/A (Pressure): SAE J518 Code 62 1 in (400 bar, M12×1.75, 17 mm deep); Port S (Suction): SAE J518 Code 61 2 1/2 in (M12×1.75, 17 mm deep); U (Flushing): M18×1.5; R (Bleed): M18×1.5; A1 (Gauge): M16×1.5; T1 (Drain): M12×1.5; X3: M16×1.5; Y3: M14×1.5 |
| HYH7VO-107 | Centering Pilot: Ø160 mm (-0.025 mm, h8); Pitch Circle: Ø200 mm; 4 × Ø17.5 mm holes; Flange Width: 190 × 190 mm | Spline Z: DIN 5480 W40×2×30×18×9g (ext. 63 mm); Keyed P: DIN 6885 AS12×8×63 (shaft Ø40 mm k6, ext. 63 mm) | Port B/A (Pressure): SAE J518 Code 62 1 in (400 bar, M12×1.75, 17 mm deep); Port S (Suction): SAE J518 Code 61 2 1/2 in (M12×1.75, 17 mm deep); U (Flushing): M18×1.5; R (Bleed): M18×1.5; A1 (Gauge): M16×1.5; T1 (Drain): M12×1.5; X3: M16×1.5; Y3: M14×1.5 |
| HYH7VO-160 | Centering Pilot: Ø180 mm (-0.025 mm, h8); Pitch Circle: Ø224 mm; 4 × Ø17.5 mm holes; Flange Width: 210 × 210 mm | Spline Z: DIN 5480 W45×2×30×21×9g (ext. 70 mm); Keyed P: DIN 6885 AS14×9×70 (shaft Ø45 mm k6, ext. 70 mm) | Port B/A (Pressure): SAE J518 Code 62 1 1/4 in (400 bar, M14×1.5, 19 mm deep); Port S (Suction): SAE J518 Code 61 3 in (M16×1.5, 24 mm deep); U (Flushing): M22×1.5; R (Bleed): M26×1.5; A1 (Gauge): M16×1.5; T1 (Drain): M12×1.5; X3: M16×1.5; Y3: M14×1.5 |
| Direct Interchangeability and OEM Replacement Matrix (Rexroth A7VO Series 63)
| Hengyuhang Series Model | OEM Original Rexroth Reference Model | Control & Shaft Configuration | Interchangeability Verification Status |
|---|---|---|---|
| HYH7VO-28 | A7VO 28 LRD / 63R-NZB01 (or A7VO 28 DR / 63R-NZB01) | LRD / DR Control, Spline W25, ISO 4-Bolt Ø100 | 100% Direct Physical & Functional Drop-in Replacement |
| HYH7VO-55 | A7VO 55 LRD / 63R-NZB01 (or A7VO 55 DR / 63R-NZB01) | LRD / DR Control, Spline W30, ISO 4-Bolt Ø125 | 100% Direct Physical & Functional Drop-in Replacement |
| HYH7VO-80 | A7VO 80 LRD / 63R-NZB01 (or A7VO 80 DR / 63R-NZB01) | LRD / DR Control, Spline W35, ISO 4-Bolt Ø140 | 100% Direct Physical & Functional Drop-in Replacement |
| HYH7VO-107 | A7VO 107 LRD / 63R-NZB01 (or A7VO 107 DR / 63R-NZB01) | LRD / DR Control, Spline W40, ISO 4-Bolt Ø160 | 100% Direct Physical & Functional Drop-in Replacement |
| HYH7VO-160 | A7VO 160 LRD / 63R-NZB01 (or A7VO 160 DR / 63R-NZB01) | LRD / DR Control, Spline W45, ISO 4-Bolt Ø180 | 100% Direct Physical & Functional Drop-in Replacement |
| HYH7VO Extended Series | A7VO 250 / 355 / 500 LRD / 63R-VZB01 | Heavy Bent-Axis Industrial Open Circuit | Full Series Interchangeability Across 28~500 cm³/rev |
| Model Coding & Ordering Structure
| Code Field | Field Designation | Available Standard Codes | Technical Definition & Configuration Meaning |
|---|---|---|---|
| [01] Unit Type | Axial Piston Pump Series | HYH7V | Bent-axis variable displacement axial piston unit, nominal 350 bar / peak 400 bar |
| [02] Circuit Mode | Operating Circuit | O | Open-circuit hydrostatic drive pump |
| [03] Frame Size | Nominal Displacement (cm³) | 28, 55, 80, 107, 160 | Approximate maximum geometric displacement per revolution Vg max in cm³ |
| [04] Control Device | Regulation Device | LR / LRD / LRDH1 / DR / DRG / DRS / HD1 / HD2 / EP | Hyperbolic power control, constant pressure control, pilot hydraulic control, or proportional electric control |
| [05] Series Index | Series Designation | 63 | Series 6, Index 3 modern bent-axis generation |
| [06] Rotation | Direction of Rotation | R / L | Code R: Clockwise rotation (flow S to B); Code L: Counter-Clockwise rotation (flow S to A) |
| [07] Seals | Seal Material Combination | N / V | Code N: NBR housing O-rings with FKM shaft seal ring (-25°C~+115°C); Code V: Full FKM seals |
| [08] Shaft End | Input Shaft Configuration | Z / P | Code Z: Involute splined shaft DIN 5480; Code P: Cylindrical parallel keyed shaft DIN 6885 |
| [09] Flange | Mounting Flange Style | B | Code B: ISO 3019-2 4-hole metric mounting flange |
| [10] Service Ports | Port Location & Interface | 01 | Code 01: Rear-face service line port B (or A) Code 62 and suction port S Code 61 with metric threads |
| Technical Performance Matrix Across Available Sizes
| Model Number (Hengyuhang Series) | Displacement Vg max (cm³) | Drive Speed Limits (rpm) | Max. Flow qv max1 @ n_max1 (L/min) | Power P max1 @ 350 bar (kW) | Torque T max @ 350 bar (Nm) | Rotary Stiffness (Nm/rad) | Inertia J_TW (kg·m²) | Angular Accel. α max (rad/s²) | Case Fill (L) | Mass (kg) | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Nominal n_max1 | @ 0.74 Vg n_max2 | Permissible n_perm | c_min (Vg max) | c_max (0.5 Vg) | |||||||||
| Primary Production Frame Range: HYH7VO Series 63 (Sizes 28 to 160) | |||||||||||||
| HYH7VO-28 | 28.1 | 3150 | 4250 | 4750 | 89 | 52 | 156 | 5546 | 16541 | 0.0042 | 35900 | 0.50 | 17 |
| HYH7VO-55 | 54.8 | 2500 | 3400 | 3750 | 137 | 80 | 305 | 10594 | 32103 | 0.0042 | 31600 | 0.75 | 25 |
| HYH7VO-80 | 80.0 | 2240 | 3000 | 3350 | 179 | 105 | 446 | 15911 | 48971 | 0.0080 | 24200 | 1.20 | 40 |
| HYH7VO-107 | 107.0 | 2150 | 2900 | 3200 | 230 | 134 | 596 | 21469 | 67666 | 0.0127 | 19200 | 1.50 | 49 |
| HYH7VO-160 | 160.0 | 1900 | 2560 | 2850 | 304 | 177 | 891 | 36073 | 104622 | 0.0253 | 15300 | 2.40 | 71 |
| Extended Heavy Industrial Frames: HYH7VO Series 63 (Sizes 250 to 500) | |||||||||||||
| HYH7VO-250 | 250.0 | 1500 | — | 1800 | 375 | 219 | 1391 | 59500 | 181000 | 0.0610 | 10000 | 3.00 | 102 |
| HYH7VO-355 | 355.0 | 1320 | — | 1600 | 469 | 273 | 1978 | 74800 | 262000 | 0.1020 | 8300 | 5.00 | 173 |
| HYH7VO-500 | 500.0 | 1200 | — | 1500 | 600 | 350 | 2785 | 115000 | 391000 | 0.1780 | 5500 | 7.00 | 234 |
| Hengyuhang Series Model | OEM Original Rexroth Reference Model | Control & Shaft Configuration | Interchangeability Verification Status |
|---|---|---|---|
| HYH7VO-28 | A7VO 28 LRD / 63R-NZB01 (or A7VO 28 DR / 63R-NZB01) | LRD / DR Control, Spline W25, ISO 4-Bolt Ø100 | 100% Direct Physical & Functional Drop-in Replacement |
| HYH7VO-55 | A7VO 55 LRD / 63R-NZB01 (or A7VO 55 DR / 63R-NZB01) | LRD / DR Control, Spline W30, ISO 4-Bolt Ø125 | 100% Direct Physical & Functional Drop-in Replacement |
| HYH7VO-80 | A7VO 80 LRD / 63R-NZB01 (or A7VO 80 DR / 63R-NZB01) | LRD / DR Control, Spline W35, ISO 4-Bolt Ø140 | 100% Direct Physical & Functional Drop-in Replacement |
| HYH7VO-107 | A7VO 107 LRD / 63R-NZB01 (or A7VO 107 DR / 63R-NZB01) | LRD / DR Control, Spline W40, ISO 4-Bolt Ø160 | 100% Direct Physical & Functional Drop-in Replacement |
| HYH7VO-160 | A7VO 160 LRD / 63R-NZB01 (or A7VO 160 DR / 63R-NZB01) | LRD / DR Control, Spline W45, ISO 4-Bolt Ø180 | 100% Direct Physical & Functional Drop-in Replacement |
| HYH7VO Extended Series | A7VO 250 / 355 / 500 LRD / 63R-VZB01 | Heavy Bent-Axis Industrial Open Circuit | Full Series Interchangeability Across 28~500 cm³/rev |
| Code Field | Field Designation | Available Standard Codes | Technical Definition & Configuration Meaning |
|---|---|---|---|
| [01] Unit Type | Axial Piston Pump Series | HYH7V | Bent-axis variable displacement axial piston unit, nominal 350 bar / peak 400 bar |
| [02] Circuit Mode | Operating Circuit | O | Open-circuit hydrostatic drive pump |
| [03] Frame Size | Nominal Displacement (cm³) | 28, 55, 80, 107, 160 | Approximate maximum geometric displacement per revolution Vg max in cm³ |
| [04] Control Device | Regulation Device | LR / LRD / LRDH1 / DR / DRG / DRS / HD1 / HD2 / EP | Hyperbolic power control, constant pressure control, pilot hydraulic control, or proportional electric control |
| [05] Series Index | Series Designation | 63 | Series 6, Index 3 modern bent-axis generation |
| [06] Rotation | Direction of Rotation | R / L | Code R: Clockwise rotation (flow S to B); Code L: Counter-Clockwise rotation (flow S to A) |
| [07] Seals | Seal Material Combination | N / V | Code N: NBR housing O-rings with FKM shaft seal ring (-25°C~+115°C); Code V: Full FKM seals |
| [08] Shaft End | Input Shaft Configuration | Z / P | Code Z: Involute splined shaft DIN 5480; Code P: Cylindrical parallel keyed shaft DIN 6885 |
| [09] Flange | Mounting Flange Style | B | Code B: ISO 3019-2 4-hole metric mounting flange |
| [10] Service Ports | Port Location & Interface | 01 | Code 01: Rear-face service line port B (or A) Code 62 and suction port S Code 61 with metric threads |
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