Piston pump
HENGYUHANG Axial Piston Variable Displacement Pump HYH10VSO Series 31
Engineered with an all-purpose swashplate axial piston rotary group for open-circuit hydrostatic drives, the HENGYUHANG HYH10VSO Series 31 variable displacement pump delivers steplessly adjustable flow, low operating noise, favorable power-to-weight ratio, and a nominal continuous operating pressure of 280 bar with maximum peak pressure reaching 350 bar (5,076 psi / 35 MPa).
| Applications
Widely deployed across global industrial automation, plastic injection molding machines, CNC metal-forming and stamping presses, civil engineering power packs, and material handling systems, this versatile medium-pressure pump features standardized ISO 3019-2 2-bolt mounting flanges (Code A), universal 100% through-drive options for auxiliary gear and piston pumps, and extensive control configurations (DR, DFR/DFR1, DRG, DFLR, ED72, ER72), delivering seamless 1:1 OEM drop-in replacement for Bosch Rexroth A10VSO Series 31 pumps.
| Key Technical Specifications
Product Model: Hengyuhang Axial Piston Variable Displacement Pump HYH10VSO Series 31
Brand Replacement: Bosch Rexroth A10VSO Series 31 (18, 28, 45, 71, 100) OEM or as requested.
Displacement: 18 to 140 cm³/rev across 6 standardized frame sizes (18, 28, 45, 71, 100, 140)
Rotation Direction: Clockwise (R), counter-clockwise (L) (viewed from drive shaft end)
Speed Range: Nominal speeds 2000 to 3300 r/min (High-speed option H: up to 2300 to 3000 r/min depending on frame size)
Peak Pressure: Nominal continuous working pressure 280 bar (4,060 psi); Maximum peak pressure 350 bar (5,076 psi / 35 MPa)
- Description
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| Overview of HENGYUHANG HYH10VSO Series 31
The HENGYUHANG HYH10VSO Series 31 is an all-purpose medium-pressure axial piston variable displacement pump engineered specifically for open-circuit hydrostatic drive systems. Available across six standardized displacement ratings—NG 18, NG 28, NG 45, NG 71, NG 88, and NG 100 cm³/rev—the pump delivers flow that is directly proportional to drive speed and swashplate displacement angle. Built with high-strength cast iron housings, hydrostatically balanced slipper-pad assemblies, and precision-engineered cylinder block assemblies, the HYH10VSO Series 31 provides exceptional volumetric efficiency (>92%), long service life, and rapid control response under demanding industrial duty cycles.
Characterized by a low acoustic footprint, excellent suction performance, and dual case drain ports (L, L1) for flexible installation positions, Series 31 represents the industry benchmark for general industrial power packs. The pump features an ISO 3019-2 2-bolt mounting flange (Code A), standardized metric-threaded SAE flange ports (Code 12 / 42), and modular through-drive couplings (SAE A, B, C and ISO 80, 100, 125) capable of transmitting 100% torque to secondary pumps, ensuring direct 1:1 drop-in interchangeability with Bosch Rexroth A10VSO Series 31 pumps without mechanical or plumbing modifications.
| Dimension of HENGYUHANG HYH10VSO Series 31
| Interface Data Needed with the Drawing Across the 6 Frame Sizes
| Frame Size (NG) | Mounting Flange (ISO 3019-2) | Drive Shaft Options | Working Port B (Outlet) | Suction Port S (Inlet) | Case Drain L, L1 | Control Ports X, MB | Tightening Torques |
|---|---|---|---|---|---|---|---|
| A10VSO18 | 2-hole flange (pilot Ø 80 -0.05 mm; bolt centers 109 mm, 2-Ø11 mm holes) | 1. Splined S: 3/4 in 11T 16/32 DP; 2. Splined R: 3/4 in 11T high-torque; 3. Keyed P: Ø 18 mm (DIN 6885 A6×6×25) | SAE 3/4 in (ISO 6162-1, 350 bar), 4-M10 × 1.5 depth 17 mm | SAE 1 in (ISO 6162-1, 10 bar), 4-M10 × 1.5 depth 17 mm | M16 × 1.5 (DIN 3852), 12 mm depth | X: M14 × 1.5 / G 1/4; MB: G 1/4 | Flange bolt: 70 N·m; Port B bolt: 60 N·m |
| A10VSO28 | 2-hole flange (pilot Ø 100 -0.05 mm; bolt centers 140 mm, 2-Ø14 mm holes) | 1. Splined S: 7/8 in 13T 16/32 DP; 2. Splined R: 7/8 in 13T high-torque; 3. Keyed P: Ø 22 mm (DIN 6885 A6×6×32) | SAE 3/4 in (ISO 6162-1, 350 bar), 4-M10 × 1.5 depth 17 mm | SAE 1-1/4 in (ISO 6162-1, 10 bar), 4-M10 × 1.5 depth 17 mm | M18 × 1.5 (DIN 3852), 12 mm depth | X: M14 × 1.5 / G 1/4; MB: G 1/4 | Flange bolt: 140 N·m; Port B bolt: 60 N·m |
| A10VSO45 | 2-hole flange (pilot Ø 125 -0.06 mm; bolt centers 160 mm, 2-Ø18 mm holes) | 1. Splined S: 1 in 15T 16/32 DP; 2. Splined R: 1 in 15T high-torque; 3. Keyed P: Ø 25 mm (DIN 6885 A8×7×36) | SAE 1 in (ISO 6162-1, 350 bar), 4-M10 × 1.5 depth 17 mm | SAE 1-1/2 in (ISO 6162-1, 10 bar), 4-M12 × 1.75 depth 20 mm | M22 × 1.5 (DIN 3852), 14 mm depth | X: M14 × 1.5 / G 1/4; MB: G 1/4 | Flange bolt: 280 N·m; Port B bolt: 60 N·m |
| A10VSO71 | 2-hole flange (pilot Ø 140 -0.06 mm; bolt centers 180 mm, 2-Ø18 mm holes) | 1. Splined S: 1-1/4 in 14T 12/24 DP; 2. Splined R: 1-1/4 in 14T high-torque; 3. Keyed P: Ø 32 mm (DIN 6885 A10×8×45) | SAE 1 in (ISO 6162-1, 350 bar), 4-M10 × 1.5 depth 17 mm | SAE 2 in (ISO 6162-1, 10 bar), 4-M12 × 1.75 depth 20 mm | M22 × 1.5 (DIN 3852), 14 mm depth | X: M14 × 1.5 / G 1/4; MB: G 1/4 | Flange bolt: 280 N·m; Port B bolt: 60 N·m |
| A10VSO100 | 2-hole flange (pilot Ø 140 -0.06 mm; bolt centers 180 mm, 2-Ø18 mm holes) | 1. Splined S: 1-1/4 in 14T 12/24 DP; 2. Splined R: 1-1/4 in 14T high-torque; 3. Keyed P: Ø 32 mm (DIN 6885 A10×8×45) | SAE 1 in (ISO 6162-1, 350 bar), 4-M10 × 1.5 depth 17 mm | SAE 2 in (ISO 6162-1, 10 bar), 4-M12 × 1.75 depth 20 mm | M22 × 1.5 (DIN 3852), 14 mm depth | X: M14 × 1.5 / G 1/4; MB: G 1/4 | Flange bolt: 280 N·m; Port B bolt: 60 N·m |
| A10VSO140 | 2-hole flange (pilot Ø 160 -0.06 mm; bolt centers 200 mm, 2-Ø22 mm holes) | 1. Splined S: 1-1/2 in 17T 12/24 DP; 2. Keyed P: Ø 40 mm (DIN 6885 A12×8×56) | SAE 1-1/4 in (ISO 6162-1, 350 bar), 4-M12 × 1.75 depth 20 mm | SAE 2-1/2 in (ISO 6162-1, 10 bar), 4-M12 × 1.75 depth 20 mm | M27 × 2 (DIN 3852), 16 mm depth | X: M14 × 1.5 / G 1/4; MB: G 1/4 | Flange bolt: 450 N·m; Port B bolt: 100 N·m |
Note: For size 140 cm³/rev, please refer to Series 32 specification sheet.
| Pump Installation Specifications HENGYUHANG HYH10VSO Series 31
| Comprehensive Ordering Code Structure (Aligned with RE 92711 Series 31)
Code structure — reference: HYH10VS−O−NG−Control/31−R−V−Shaft−A−Port−ThroughDrive−Connector
| Position | Code Element | Description & Selection Options |
|---|---|---|
| 01 | Version | Blank = Standard version for mineral oil; E = HFA, HFB, HFC fire-resistant hydraulic fluid; H = High-speed version |
| 02 | Axial Piston Unit | HYH10VS = Swashplate axial piston variable displacement pump, nominal 280 bar, peak 350 bar |
| 03 | Operating Mode | O = Open circuit pump |
| 04 | Size (NG) | 18, 28, 45, 71, 88, 100 cm³/rev |
| 05 | Control Device | DG = Two-point direct hydraulic control; DR = Hydraulic pressure controller; DFR = Pressure and flow controller (load sensing, X-T open); DFR1 = Pressure and flow controller (load sensing, X-T plugged, with flushing function); DRG = Remote-controlled pressure controller with pressure cut-off; ED72 = Electrohydraulic pressure control (24V DC, negative control); ER72 = Electrohydraulic pressure control (24V DC, positive control); DFLR = Pressure, flow, and power controller |
| 06 | Series | 31 = Series 3, Index 1 (Baureihe 31) |
| 07 | Direction of Rotation | R = Clockwise; L = Counter-clockwise (viewed from drive shaft end) |
| 08 | Sealing Material | V = FKM / Viton fluoroelastomer (standard); P = NBR (only with HF fluid version E) |
| 09 | Drive Shaft | S = Involute splined shaft standard (ISO 3019-1 / ANSI B92.1a); R = Involute splined shaft (reinforced for higher through-drive torque); P = Parallel cylindrical keyed shaft (DIN 6885) |
| 10 | Mounting Flange | A = ISO 3019-2 2-hole flange (2-bolt) |
| 11 | Working Line Ports | 12 = SAE flanged ports laterally opposite, metric fastening thread (NG 18, 28, 45, 100); 42 = SAE flanged ports laterally opposite, metric fastening thread (NG 71, 88) |
| 12 | Through-Drive | N00 = Without through-drive; K01 = SAE A (82-2) hub 9T 16/32 DP; K52 = SAE A (82-2) hub 11T 16/32 DP; K68 = SAE B (101-2) hub 13T 16/32 DP; K04 = SAE B (101-2) hub 15T 16/32 DP; K07 = SAE C (127-2) hub 14T 12/24 DP; K24 = SAE C (127-2) hub 17T 12/24 DP; KB2 to KB6 = ISO 3019-2 2-hole through-drives; K57 = Metric 4-hole |
| 13 | Connector for Solenoids | Blank = Without solenoid / hydraulic control; H = Hirschmann connector according to DIN EN 175301-803 without suppressor diode |
| Reading Your Replacement Code
| Target Bosch Rexroth Part Code | HENGYUHANG HYH Equivalent | Interchange Verification Notes |
|---|---|---|
| A10VSO18DFR1/31R-PPA12N00 | HYH10VSO-18-DFR1/31-R-P-P-A-12-N00 | Direct 1:1 drop-in: NG 18, load-sensing DFR1, Series 31, clockwise, keyed shaft P, 2-bolt flange A, no through-drive |
| A10VSO28DR/31R-VPA12N00 | HYH10VSO-28-DR/31-R-V-P-A-12-N00 | Direct 1:1 drop-in: NG 28, DR pressure control, Series 31, FKM seals, keyed shaft P, 2-bolt flange A |
| A10VSO45DFR1/31R-VPA12N00 | HYH10VSO-45-DFR1/31-R-V-P-A-12-N00 | Direct 1:1 drop-in: NG 45, DFR1 load-sensing, FKM seals, keyed shaft P, 2-bolt flange A |
| A10VSO71DFR1/31R-VPA42N00 | HYH10VSO-71-DFR1/31-R-V-P-A-42-N00 | Direct 1:1 drop-in: NG 71, DFR1 load-sensing, FKM seals, keyed shaft P, Port 42 laterally opposite |
| A10VSO100DFR1/31R-VPA12N00 | HYH10VSO-100-DFR1/31-R-V-P-A-12-N00 | Direct 1:1 drop-in: NG 100, DFR1 load-sensing, FKM seals, keyed shaft P, 2-bolt flange A |
| Techspecs of HENGYUHANG HYH10VSO Series 31
| 4.1 Standard Unit Technical Data Across All 6 Frame Sizes (from RE 92711)
| Parameter / Technical Specification | Symbol | Unit | 18 | 28 | 45 | 71 | 100 | 140 |
|---|---|---|---|---|---|---|---|---|
| Geometric Displacement per rev | Vg max | cm³ | 18 | 28 | 45 | 71 | 100 | 140 |
| Maximum Nominal Speed (at Vg max, p abs ≥ 1.0 bar) | n nom | r/min | 3,300 | 3,000 | 2,600 | 2,200 | 2,100 | 2,000 |
| Max. Permissible Intermittent Speed (Vg < Vg max) | n max perm | r/min | 3,900 | 3,600 | 3,100 | 2,600 | 2,500 | 2,400 |
| Max. Flow Delivery (at n nom, Vg max) | qv max | l/min | 59 | 84 | 117 | 156 | 185 | 200 |
| Flow Delivery at Electric Motor Speed (n = 1500 r/min) | qvE max | l/min | 27 | 42 | 68 | 107 | 132 | 150 |
| Nominal Continuous Pressure | p nom | bar | 280 | 280 | 280 | 280 | 280 | 280 |
| Maximum Peak Pressure | p max | bar | 350 | 350 | 350 | 350 | 350 | 350 |
| Drive Power at n nom and Δp = 280 bar | P max | kW | 28.0 | 39.0 | 55.0 | 73.0 | 86.0 | 93.0 |
| Drive Power at n = 1500 r/min and Δp = 280 bar | PE max | kW | 12.6 | 20.0 | 32.0 | 50.0 | 62.0 | 70.0 |
| Drive Torque at Δp = 280 bar | M max | N·m | 80 | 125 | 200 | 316 | 392 | 445 |
| Drive Torque at Δp = 100 bar | M | N·m | 30 | 45 | 72 | 113 | 140 | 159 |
| Torsional Shaft Stiffness (Splined S) | c | N·m/rad | 11,087 | 22,317 | 37,500 | 71,884 | 71,884 | 121,142 |
| Torsional Shaft Stiffness (Keyed P) | c | N·m/rad | 13,158 | 25,656 | 41,232 | 80,627 | 80,627 | 132,335 |
| Rotary Group Moment of Inertia | J TW | kg·m² | 0.00093 | 0.0017 | 0.0033 | 0.0083 | 0.0083 | 0.0167 |
| Case Fluid Filling Volume | V | l | 0.4 | 0.7 | 1.0 | 1.6 | 1.6 | 2.2 |
| Pump Weight (without Through-Drive) | m | kg | 12.9 | 18.0 | 23.5 | 35.2 | 35.2 | 49.5 |
| Pump Weight (with Through-Drive) | m | kg | 14.0 | 19.3 | 25.1 | 38.0 | 38.0 | 55.4 |
| 4.2 High-Speed Version (Ausführung H) Specifications (from RE 92711)
| Frame Size | Nominal Speed (n nom at Vg max) | Max Speed (Vg < Vg max) | Max Flow Delivery | Max Power (Δp = 280 bar) |
|---|---|---|---|---|
| 45 | 3,000 r/min | 3,300 r/min | 135 l/min | 63 kW |
| 71 | 2,550 r/min | 2,800 r/min | 178 l/min | 83 kW |
| 100 | 2,300 r/min | 2,500 r/min | 230 l/min | 107 kW |
| 4.3 General Operating Conditions & Fluid Compatibility (Aligned with RE 92711)
| Parameter | Permissible Operating Limits | Optimal Recommended Target |
|---|---|---|
| Operating Hydraulic Fluid | Mineral oil HLP according to DIN 51524 (HF fluids compliant with RD 90225) | Anti-wear premium hydraulic mineral oil |
| Kinematic Viscosity (Continuous) | ν = 10 to 400 mm²/s (cSt) | ν opt = 16 to 36 mm²/s (cSt) |
| Cold Start Viscosity | ν max ≤ 1600 mm²/s (t ≤ 30 min, p ≤ 50 bar, n ≤ 1000 rpm) | System pre-warming recommended |
| Short-Term Viscosity Limit | ν min = 7 to 10 mm²/s (t ≤ 30 min, p ≤ 0.3 × p nom) | Measured at case drain port L, L1 |
| Operating Temperature Range | Standard FKM seals: -25 °C to +110 °C (-13 °F to +230 °F) | +30 °C to +65 °C (+86 °F to +149 °F) |
| Inlet Suction Pressure (Port S) | Standard: p s min ≥ 0.8 bar abs; Max p s max = 10 bar abs | Positive suction head recommended |
| Case Drain Pressure (Port L, L1) | Maximum continuous p L max = 2.0 bar absolute (0.5 bar above inlet port S) | Direct unrestricted line to oil reservoir |
| Fluid Cleanliness Requirement | ISO 4406 Class 20/18/15 (NAS 1638 Class 9) | Cleanliness ISO 19/17/14 recommended |
Advantages
All-Purpose Open-Circuit Hydrostatic Efficiency
Swashplate rotary group design provides stepless flow variation directly proportional to drive speed, achieving overall operating efficiencies exceeding 91–93%.
Low Operating Noise & Minimal Pressure Ripple
Hydrostatically unloaded swashplate cradle bearings and micro-finished valve plate porting drastically reduce hydraulic pulsations and airborne machine emissions.
Robust 280 bar Continuous / 350 bar Peak Pressure Rating
High-tensile cast iron housing construction eliminates flexure under severe cyclic industrial loading, ensuring extended bearing and seal life.
Comprehensive Modular Control Systems
Supports precision hydraulic pressure cut-off (DR), load-sensing flow matching (DFR/DFR1), remote pilot pressure control (DRG), power limiting (DFLR), and electrohydraulic proportional control (ED72/ER72).
100% Through-Drive Torque Transmission
Full through-drive capacity enables direct tandem connection of secondary gear pumps (AZPF, AZPN, HYH series) or axial piston units without external structural supports.
1:1 Direct Drop-In Replacement for Rexroth Series 31
Identical ISO 3019-2 2-bolt mounting flange spigots, drive shaft centerlines, SAE flange ports, and controller mounting geometry guarantee direct mechanical interchangeability without engineering modifications.
Reference
Displacement & Control Configuration Matrix
Frame Sizes Available: A10VSO18, A10VSO28, A10VSO45, A10VSO71, A10VSO100, A10VSO140 (displacement 18 to 140 cm³/rev).
Controller Architectures:
DR / DRG: Constant pressure regulation / remote proportional pilot control.
DFR / DFR1: Dynamic load-sensing flow matching with integrated pressure limiter (DFR1 with flushing function).
DFLR: Simultaneous pressure, flow, and hyperbolic power control.
ED72 / ER72: 24V DC proportional solenoid control for automated PLC closed-loop systems.
Mounting Standards: ISO 3019-2 2-hole flange with ISO / SAE through-drive auxiliary adapters.
Target Brand Interchangeability Matrix
The HENGYUHANG HYH10VSO Series 31 delivers verified 1:1 drop-in replacement across the complete Bosch Rexroth A10VSO Series 31 portfolio:
Bosch Rexroth A10VSO18 Series 31 → HYH10VSO-18/31 (all control, shaft, and port variants)
Bosch Rexroth A10VSO28 Series 31 → HYH10VSO-28/31 (all control, shaft, and port variants)
Bosch Rexroth A10VSO45 Series 31 → HYH10VSO-45/31 (all control, shaft, and port variants)
Bosch Rexroth A10VSO71 Series 31 → HYH10VSO-71/31 (all control, shaft, and port variants)
Bosch Rexroth A10VSO100 Series 31 → HYH10VSO-100/31 (all control, shaft, and port variants)
Bosch Rexroth A10VSO140 Series 31 → HYH10VSO-140/31 (all control, shaft, and port variants)
Brand Replacement
The HENGYUHANG HYH10VSO Series 31 is specifically manufactured as a high-precision 1:1 drop-in replacement for the classic Bosch Rexroth A10VSO Series 31 axial piston variable displacement pump family. Every pump is dynamically calibrated on computerized test benches to mirror Rexroth factory performance curves across control hysteresis, pressure response time (<50 ms), flow repeatability, and volumetric efficiency (>92%). Utilizing standardized ISO 3019-2 2-bolt mounting pilots (Ø80, Ø100, Ø125, Ø140, Ø160 mm), metric-threaded SAE code 61 flange ports, and matching drive shaft splines (ANSI B92.1a / DIN 6885), HYH10VSO Series 31 units mount directly into existing machinery without bell-housing modifications, piping rework, or control re-tuning. Equipment builders, distributors, and maintenance facilities benefit from seamless interchangeability, shorter delivery lead times, and lower total ownership costs.
Applications
Plastic & Rubber Machinery: Servo and proportional hydraulic power units for injection molding machines, extrusion presses, and blow molding systems.
Metal Forming & Stamping Presses: Deep-drawing hydraulic presses, CNC press brakes, shearing machines, and punching lines requiring rapid pressure build-up and stable holding.
Machine Tools & Automation: Centralized hydraulic power packs for CNC machining centers, automated transfer fixtures, and clamping systems.
Mining & Metallurgy: Steel mill auxiliary circuits, continuous casting equipment, furnace tilt drives, and underground mining support systems.
Civil Engineering & Material Handling: Stationary power packs, industrial cranes, compaction systems, and municipal hydraulic equipment.
Package & Shipping
| Packaging Construction | Heavy-duty export fumigation-free wooden case with custom-molded shock-absorbing internal positioning cradles |
|---|---|
| Corrosion Protection | Internal factory testing oil preservation, external anti-rust oil coating, and vapor corrosion inhibitor (VCI) sealed plastic barrier |
| Port & Shaft Protection | Heavy-duty threaded steel/plastic port blanking plugs and precision protective plastic shaft sleeves |
| Package Dimensions | Approx. 380 × 280 × 260 mm (NG 18/28) up to 550 × 380 × 350 mm (NG 71/88/100) |
| Gross Weight | Approx. 16 kg (A10VSO18) up to 62 kg (A10VSO140) |
| Standard Lead Time | 3 – 5 business days for stocked configurations; 15 – 25 business days for volume OEM production batches |
| Global Shipping Options | Air express (DHL / FedEx / UPS / TNT) for urgent maintenance downtime; Ocean FCL/LCL or Air cargo for commercial orders |
| Custom Documentation | Mill test certificates, factory dynamic performance test graphs, and customized private-label nameplates supported |
Why Choose Hengyuhang?
Direct Factory Precision Manufacturing & CNC Excellence: Manufactured in our state-of-the-art production facility equipped with high-precision 4-axis and 5-axis CNC machining centers, automated gear hobbing, and CNC gear tooth profile grinding (Ra < 0.2 μm) to ensure superior surface finish, ultra-tight internal clearances, and maximum volumetric efficiency.
100% Full-Cycle Multi-Parameter Factory Inspection: Every single pump undergoes computerized testing before packaging, verifying flow rate at rated speed, volumetric efficiency (>91–93%), mechanical efficiency, continuous and peak pressure hold, internal bypass, and noise spectrum. Zero untested units leave the factory.
Seamless 1:1 OEM Drop-In Interchangeability: Dimensionally matched to European, SAE, and DIN standards, providing 1:1 direct mechanical interchangeability across premier global brands (Bosch Rexroth, Parker, Danfoss, etc.) with zero mounting modifications required.
Flexible Engineering Customization & Rapid Prototyping: Supported by a senior fluid power engineering team, offering custom displacement combinations, specialized shaft tapers, splines, integrated priority or relief valves, and non-standard port orientations with rapid sample prototyping and low MOQ requirements.
Robust Supply Chain, Extensive Inventory & Fast Global Dispatch: Extensive raw material stock of high-grade ductile cast iron castings, alloy steel gear sets, and bearing assemblies enables rapid assembly and 48–72 hour dispatch for emergency breakdown replacements, supported by complete export logistics.
12-Month Comprehensive Warranty & Lifetime Technical Support: All pumps are backed by a comprehensive 12-month manufacturer warranty against defects in materials and workmanship, supplemented by 24/7 engineering consultation, CAD drawing verification, and lifecycle technical assistance.
Axial Piston Variable Pump HYH10VSO Series 31 (Axialkolben-Verstellpumpe HYH10VSO Baureihe 31 Series, 18.00~100.00 cm³/rev) is a high-pressure, swashplate-design variable displacement axial piston pump engineered for open-circuit industrial and mobile hydrostatic transmissions requiring dynamic proportional flow control, high energy efficiency, and extended service life under continuous heavy-duty operation. Manufactured as a 100% direct dimensional, hydraulic, and functional drop-in custom replacement for the global benchmark Bosch Rexroth A10VSO Series 31 (A10VSO Baureihe 31), the HYH10VSO Series 31 provides full interchangeability across all 6 standardized displacement frame sizes: 18, 28, 45, 71, 100, and 140 cm³/rev. Operating at a continuous nominal working pressure (p_nom) of 280 bar (4,060 psi / 28 MPa) and a maximum peak pressure (p_max) of 350 bar (5,076 psi / 35 MPa), the pump features stepless flow variation proportional to drive speed and swashplate deflection angle. Equipped with precision-machined bi-metallic valve plates, case-hardened alloy steel cylinder blocks, high-grade swashplate cradle bearings, and hydrostatically balanced slipper pads, the HYH10VSO series delivers low acoustic noise emissions, high power-to-weight density, short control response times, and exceptional volumetric efficiency exceeding 95%. Featuring standardized ISO 3019-2 and SAE J744 2-bolt mounting flanges, SAE J518 Code 61 high-pressure split-flange ports, versatile through-drive options (K01~K24) for multi-circuit tandem pump assemblies, and a comprehensive range of modular control devices—including DR pressure controllers, DFR / DFR1 load-sensing flow controllers, DFLR power limiters, and ED / ER electro-proportional controls—the HYH10VSO series seamlessly replaces OEM Rexroth A10VSO pumps without requiring piping redesign, mechanical bracket modification, or control circuit reprogramming.
| Applications
The HYH10VSO Series 31 axial piston variable pump is specifically designed for open-circuit industrial machinery, mobile equipment, and electro-hydraulic power units requiring high working pressures, stepless displacement adjustment, and rapid load-sensing response:
Plastic Injection Molding Machines and Die-Casting Equipment: Serves as the primary variable displacement power source; equipped with DFR1 load-sensing or DFLR power controllers to deliver exact flow on demand during mold clamping, injection holding, plasticizing, and core pulling, cutting idling energy losses by over 30% compared to fixed-displacement systems.
CNC Hydraulic Press Brakes, Bending Machines, and Stamping Presses: Operates seamlessly with high-speed proportional pressure/flow cycles; delivers rapid cylinder approach speeds and sustained 280 bar tonnage holding during sheet metal forming, maintaining tight dimensional tolerances and rapid swashplate de-stroking response.
Mobile Construction Machinery and Mining Equipment: Powers open-circuit implement hydraulic systems on wheel loaders, excavators, piling rigs, and drilling rigs; directly couples to diesel engine PTOs via SAE J744 2-bolt mounting flanges and heavy-duty splined drive shafts.
Heavy Industrial Power Units and Hydraulic Test Rigs: Provides continuous high-pressure fluid power in steel mills, metallurgy plants, and component endurance testing benches; features robust swashplate bearings and wide fluid compatibility across standard HLP mineral oils and fire-resistant fluids.
Marine Deck Machinery and Offshore Handling Winches: Powers anchor windlasses, cargo cranes, and mooring winches; high-tensile cast iron housing and premium fluorocarbon (FKM) sealing ensure long-term durability against marine atmospheric corrosion and thermal cycling.
Multi-Pump Tandem Configurations (Through-Drive Assemblies): Utilizing rear through-drive hubs (K01, K02, K04, K07, K24), the HYH10VSO easily drives secondary axial piston pumps, internal gear pumps (such as 2PHF/3PHF), or external gear pumps off a single prime mover, creating compact multi-circuit power units.
| Key Specifications Overview
| Parameter | Engineering Specification (Series 31 Standard) |
|---|---|
| Series Architecture | Swashplate Design Variable Displacement Axial Piston Pump for Open Circuit Transmissions (Series 31) |
| Standard Displacement Frame Sizes (NG) | 6 Standard Nominal Sizes: 18, 28, 45, 71, 100, 140 cm³/rev |
| Nominal Continuous Pressure (p_nom) | 280 bar (4,060 psi / 28 MPa) continuous working pressure at working port B |
| Maximum Peak Operating Pressure (p_max) | 350 bar (5,076 psi / 35 MPa) peak surge pressure (single period max 2 ms, cumulative 300 h) |
| Minimum Pressure on High-Pressure Side (p_B min) | 10 bar absolute (required to prevent rotary group separation during rapid de-stroking) |
| Suction Port Pressure Range (p_S) | Minimum: 0.8 bar absolute (prevent cavitation at n_nom); Maximum: 10 bar absolute |
| Maximum Case Drain Pressure (p_L, p_L1) | Maximum 2.0 bar absolute (must not exceed 0.5 bar above suction port pressure p_S) |
| Permissible Drive Speed Range | Nominal speed at max displacement: 2000 ~ 3300 rpm; Permissible max speed at reduced stroke: 2400 ~ 3900 rpm |
| Maximum Theoretical Flow Rate @ 1500 rpm | 27.0 L/min (A10VSO18), 42.0 L/min (A10VSO28), 67.5 L/min (A10VSO45), 106.5 L/min (A10VSO71), 132.0 L/min (A10VSO100), 150.0 L/min (A10VSO140) |
| Nominal Drive Power @ 1500 rpm (Δp = 280 bar) | 12.6 kW (A10VSO18), 20.0 kW (A10VSO28), 32.0 kW (A10VSO45), 50.0 kW (A10VSO71), 62.0 kW (A10VSO100), 70.0 kW (A10VSO140) |
| Drive Torque @ 280 bar (Δp = 280 bar) | 80 Nm (A10VSO18), 125 Nm (A10VSO28), 200 Nm (A10VSO45), 316 Nm (A10VSO71), 392 Nm (A10VSO100), 445 Nm (A10VSO140) |
| Housing and Swashplate Construction | High-strength vermicular/ductile cast iron body with high torsional stiffness and optimized acoustic dampening |
| Mounting Flange Standards | ISO 3019-2 2-hole metric flange (Code A) and SAE J744 2-bolt oval flanges (SAE A, SAE B, SAE C) |
| Drive Shaft Standards | ANSI B92.1a Involute Splined Shaft (Code S standard, Code R reinforced high-torque); DIN 6885 Parallel Keyed Shaft (Code P) |
| High-Pressure Working Port B Standard | SAE J518 / ISO 6162-1 Code 61 split-flange port with metric fastening thread (laterally opposite or rear ported) |
| Suction Port S Standard | SAE J518 / ISO 6162-1 Code 61 high-flow suction split-flange port with metric fastening thread |
| Direction of Rotation | Clockwise (R) standard; Counter-Clockwise (L) optional (viewed facing drive shaft) |
| Hydraulic Fluid Compatibility | HLP mineral oils to DIN 51524-2; optional HFA, HFB, HFC environmentally acceptable fluids (Version E) |
| Fluid Temperature & Viscosity Range | Operating temperature: -25°C to +90°C (NBR seals) / -20°C to +115°C (FKM seals); Viscosity: 16 to 36 mm²/s optimal (10 to 1000 mm²/s permissible) |
| Fluid Cleanliness Requirement | ISO 4406 Class 20/18/15 or NAS 1638 Class 9 minimum |
| Technical Performance Matrix Across Displacement Sizes
| Nominal Frame Size | Geometric Displ. cm³/rev (in³/rev) | Pressure Rating (bar / psi) | Max Speed (rpm) | Flow Output (L/min) | Drive Power @ 280 bar (kW) | Torque @ 280 bar (Nm) | Pump Weight (kg, approx) | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Nominal (p_nom) | Peak (p_max) | At Vg_max (n_nom) | At Vg < Vg_max | @ n_nom | @ 1500 rpm | @ n_nom | @ 1500 rpm | ||||
| HYH10VSO 18 | 18.0 (1.10) | 280 / 4,060 | 350 / 5,076 | 3300 | 3900 | 59.0 | 27.0 | 28.0 | 12.6 | 80 | 12.9 |
| HYH10VSO 28 | 28.0 (1.71) | 280 / 4,060 | 350 / 5,076 | 3000 | 3600 | 84.0 | 42.0 | 39.0 | 20.0 | 125 | 18.0 |
| HYH10VSO 45 | 45.0 (2.75) | 280 / 4,060 | 350 / 5,076 | 2600 | 3100 | 117.0 | 67.5 | 55.0 | 32.0 | 200 | 23.5 |
| HYH10VSO 71 | 71.0 (4.33) | 280 / 4,060 | 350 / 5,076 | 2200 | 2600 | 156.0 | 106.5 | 73.0 | 50.0 | 316 | 35.2 |
| HYH10VSO 100 | 100.0 (5.37) | 280 / 4,060 | 350 / 5,076 | 2100 | 2500 | 185.0 | 132.0 | 86.0 | 62.0 | 392 | 35.2 |
| HYH10VSO 140 | 140.0 (6.10) | 280 / 4,060 | 350 / 5,076 | 2000 | 2400 | 200.0 | 150.0 | 93.0 | 70.0 | 445 | 49.5 |
| Modular Control Devices and Functional Principles
| Control Code | Control Description | Functional Principle and Operational Characteristics |
|---|---|---|
| DR | Pressure Controller (Druckregler) | Maintains a constant preset system pressure regardless of pump delivery flow. When system pressure reaches the setting, the pump automatically de-strokes toward zero displacement (V_g min), supplying only pilot leakage flow while maintaining system holding pressure. Setting range: 50 ~ 280 bar. |
| DFR / DFR1 | Pressure & Flow Controller (Load-Sensing) | Maintains a constant differential pressure (Δp = 14 ~ 22 bar) across an external metering orifice or proportional valve. Pump delivery flow matches instantaneous actuator demand regardless of load pressure changes. DFR1 includes a plugged X-T bleed orifice for reduced standby losses in closed-center circuits. |
| DFLR | Pressure, Flow & Power Controller | Combines load-sensing flow control with a hyperbolic input power limiter. Ensures pump drive torque and electric motor / diesel engine power draw do not exceed prime mover ratings (p × V_g = constant curve), preventing motor stalling under heavy combined loads. |
| DRG | Remote Pressure Controller | Enables pilot-operated pressure control via an external relief valve connected to port X. Allows remote multi-pressure switching or stepless proportional pressure adjustment away from the pump installation location. |
| ED72 / ER72 | Electro-Proportional Pressure Control | Integrated 24V DC proportional solenoid valve directly regulates pump pressure cut-off setting via electrical command signals (0~1200 mA). ED72 features negative control (current drop increases pressure); ER72 features positive control (current increase increases pressure). |
| Mounting Flange, Shaft and Port Details
| Frame Size | Mounting Flange Standard | Drive Shaft Options | Working Port Connections (ISO 6162-1) |
|---|---|---|---|
| HYH10VSO 18 | ISO 3019-2 80-2 (pilot Ø80 mm) / SAE A 2-bolt (pilot Ø82.55 mm, 106.4 mm centers) | Splined shaft ANSI B92.1a 3/4 in 11T 16/32DP (Code S); Parallel keyed shaft Ø18 mm DIN 6885 (Code P) | Working port B: 3/4 in SAE Code 61 flange (M10); Suction port S: 1 in SAE Code 61 flange (M10) |
| HYH10VSO 28 | ISO 3019-2 100-2 (pilot Ø100 mm) / SAE B 2-bolt (pilot Ø101.6 mm, 146.0 mm centers) | Splined shaft ANSI B92.1a 7/8 in 13T 16/32DP (Code S); Parallel keyed shaft Ø25 mm DIN 6885 (Code P) | Working port B: 3/4 in SAE Code 61 flange (M10); Suction port S: 1-1/4 in SAE Code 61 flange (M10) |
| HYH10VSO 45 | ISO 3019-2 100-2 (pilot Ø100 mm) / SAE B 2-bolt (pilot Ø101.6 mm, 146.0 mm centers) | Splined shaft ANSI B92.1a 1 in 15T 16/32DP (Code S); Parallel keyed shaft Ø30 mm DIN 6885 (Code P) | Working port B: 1 in SAE Code 61 flange (M12); Suction port S: 1-1/2 in SAE Code 61 flange (M12) |
| HYH10VSO 71 | ISO 3019-2 125-2 (pilot Ø125 mm) / SAE C 2-bolt (pilot Ø127.0 mm, 181.0 mm centers) | Splined shaft ANSI B92.1a 1-1/4 in 14T 12/24DP (Code S/R); Parallel keyed shaft Ø32 mm DIN 6885 (Code P) | Working port B: 1 in SAE Code 61 flange (M12); Suction port S: 2 in SAE Code 61 flange (M12) |
| HYH10VSO 100 | ISO 3019-2 125-2 (pilot Ø125 mm) / SAE C 2-bolt (pilot Ø127.0 mm, 181.0 mm centers) | Splined shaft ANSI B92.1a 1-1/4 in 14T 12/24DP (Code S/R); Parallel keyed shaft Ø32 mm DIN 6885 (Code P) | Working port B: 1 in SAE Code 61 flange (M12); Suction port S: 2 in SAE Code 61 flange (M12) |
| HYH10VSO 140 | ISO 3019-2 125-2 (pilot Ø125 mm) / SAE C 2-bolt (pilot Ø127.0 mm, 181.0 mm centers) | Splined shaft ANSI B92.1a 1-1/2 in 17T 12/24DP (Code S/R); Parallel keyed shaft Ø40 mm DIN 6885 (Code P) | Working port B: 1-1/4 in SAE Code 61 flange (M14); Suction port S: 2-1/2 in SAE Code 61 flange (M12) |
| Direct Interchangeability and OEM Replacement Matrix (Rexroth A10VSO Series 31)
| Hengyuhang Series | OEM Target Model | OEM Series Specification | Interchangeability and Drop-In Compliance |
|---|---|---|---|
| HYH10VSO 18 / 31 | Bosch Rexroth A10VSO 18 / 31 | A10VSO 18 DFR1 / 31R-PPA12N00 | 100% direct dimensional, hydraulic, and mounting drop-in replacement; identical port locations, shaft spline, and control valves. |
| HYH10VSO 28 / 31 | Bosch Rexroth A10VSO 28 / 31 | A10VSO 28 DR / DFR / DFLR / 31R-VPA12N00 | Identical pilot Ø100 mm / SAE B mounting, 7/8 in 13T spline, SAE flange ports, and load-sensing performance. |
| HYH10VSO 45 / 31 | Bosch Rexroth A10VSO 45 / 31 | A10VSO 45 DFR1 / DFLR / 31R-VPA12N00 | Direct interchangeability on plastic injection machines and press brakes; identical pressure cut-off and flow characteristics. |
| HYH10VSO 71 / 31 | Bosch Rexroth A10VSO 71 / 31 | A10VSO 71 DR / DFR1 / DFLR / 31R-VPA12N00 | Direct bolt-on replacement for mobile and industrial power units; 1-1/4 in 14T spline and SAE C 2-bolt interface. |
| HYH10VSO 100 / 31 | Bosch Rexroth A10VSO 100 / 31 | A10VSO 100 DFR1 / DFLR / 31R-VPA42N00 | Direct replacement for heavy industrial presses and earthmoving equipment requiring intermediate 88 cm³/rev displacement. |
| HYH10VSO 140 / 31 | Bosch Rexroth A10VSO 140 / 31 | A10VSO 140 DR / DFR1 / DFLR / 31R-VPA12N00 | Direct drop-in replacement for high-tonnage industrial power packs; identical 1-1/2 in 17T drive shaft and 350 bar peak rating. |
| Through-Drive Tandems | Rexroth A10VSO + A10VSO / Gear | Through-drive codes K01, K02, K04, K07, K24 | Fully interchangeable rear mounting flanges and spline hubs for tandem combinations with secondary axial or gear pumps. |
| Technical Performance Matrix Across Displacement Sizes
| Nominal Frame Size | Geometric Displ. cm³/rev (in³/rev) | Pressure Rating (bar / psi) | Max Speed (rpm) | Flow Output (L/min) | Drive Power @ 280 bar (kW) | Torque @ 280 bar (Nm) | Pump Weight (kg, approx) | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Nominal (p_nom) | Peak (p_max) | At Vg_max (n_nom) | At Vg < Vg_max | @ n_nom | @ 1500 rpm | @ n_nom | @ 1500 rpm | ||||
| HYH10VSO 18 | 18.0 (1.10) | 280 / 4,060 | 350 / 5,076 | 3300 | 3900 | 59.0 | 27.0 | 28.0 | 12.6 | 80 | 12.9 |
| HYH10VSO 28 | 28.0 (1.71) | 280 / 4,060 | 350 / 5,076 | 3000 | 3600 | 84.0 | 42.0 | 39.0 | 20.0 | 125 | 18.0 |
| HYH10VSO 45 | 45.0 (2.75) | 280 / 4,060 | 350 / 5,076 | 2600 | 3100 | 117.0 | 67.5 | 55.0 | 32.0 | 200 | 23.5 |
| HYH10VSO 71 | 71.0 (4.33) | 280 / 4,060 | 350 / 5,076 | 2200 | 2600 | 156.0 | 106.5 | 73.0 | 50.0 | 316 | 35.2 |
| HYH10VSO 100 | 100.0 (5.37) | 280 / 4,060 | 350 / 5,076 | 2100 | 2500 | 185.0 | 132.0 | 86.0 | 62.0 | 392 | 35.2 |
| HYH10VSO 140 | 140.0 (6.10) | 280 / 4,060 | 350 / 5,076 | 2000 | 2400 | 200.0 | 150.0 | 93.0 | 70.0 | 445 | 49.5 |
| Modular Control Devices and Functional Principles
| Control Code | Control Description | Functional Principle and Operational Characteristics |
|---|---|---|
| DR | Pressure Controller (Druckregler) | Maintains a constant preset system pressure regardless of pump delivery flow. When system pressure reaches the setting, the pump automatically de-strokes toward zero displacement (V_g min), supplying only pilot leakage flow while maintaining system holding pressure. Setting range: 50 ~ 280 bar. |
| DFR / DFR1 | Pressure & Flow Controller (Load-Sensing) | Maintains a constant differential pressure (Δp = 14 ~ 22 bar) across an external metering orifice or proportional valve. Pump delivery flow matches instantaneous actuator demand regardless of load pressure changes. DFR1 includes a plugged X-T bleed orifice for reduced standby losses in closed-center circuits. |
| DFLR | Pressure, Flow & Power Controller | Combines load-sensing flow control with a hyperbolic input power limiter. Ensures pump drive torque and electric motor / diesel engine power draw do not exceed prime mover ratings (p × V_g = constant curve), preventing motor stalling under heavy combined loads. |
| DRG | Remote Pressure Controller | Enables pilot-operated pressure control via an external relief valve connected to port X. Allows remote multi-pressure switching or stepless proportional pressure adjustment away from the pump installation location. |
| ED72 / ER72 | Electro-Proportional Pressure Control | Integrated 24V DC proportional solenoid valve directly regulates pump pressure cut-off setting via electrical command signals (0~1200 mA). ED72 features negative control (current drop increases pressure); ER72 features positive control (current increase increases pressure). |
| Mounting Flange, Shaft and Port Details
| Frame Size | Mounting Flange Standard | Drive Shaft Options | Working Port Connections (ISO 6162-1) |
|---|---|---|---|
| HYH10VSO 18 | ISO 3019-2 80-2 (pilot Ø80 mm) / SAE A 2-bolt (pilot Ø82.55 mm, 106.4 mm centers) | Splined shaft ANSI B92.1a 3/4 in 11T 16/32DP (Code S); Parallel keyed shaft Ø18 mm DIN 6885 (Code P) | Working port B: 3/4 in SAE Code 61 flange (M10); Suction port S: 1 in SAE Code 61 flange (M10) |
| HYH10VSO 28 | ISO 3019-2 100-2 (pilot Ø100 mm) / SAE B 2-bolt (pilot Ø101.6 mm, 146.0 mm centers) | Splined shaft ANSI B92.1a 7/8 in 13T 16/32DP (Code S); Parallel keyed shaft Ø25 mm DIN 6885 (Code P) | Working port B: 3/4 in SAE Code 61 flange (M10); Suction port S: 1-1/4 in SAE Code 61 flange (M10) |
| HYH10VSO 45 | ISO 3019-2 100-2 (pilot Ø100 mm) / SAE B 2-bolt (pilot Ø101.6 mm, 146.0 mm centers) | Splined shaft ANSI B92.1a 1 in 15T 16/32DP (Code S); Parallel keyed shaft Ø30 mm DIN 6885 (Code P) | Working port B: 1 in SAE Code 61 flange (M12); Suction port S: 1-1/2 in SAE Code 61 flange (M12) |
| HYH10VSO 71 | ISO 3019-2 125-2 (pilot Ø125 mm) / SAE C 2-bolt (pilot Ø127.0 mm, 181.0 mm centers) | Splined shaft ANSI B92.1a 1-1/4 in 14T 12/24DP (Code S/R); Parallel keyed shaft Ø32 mm DIN 6885 (Code P) | Working port B: 1 in SAE Code 61 flange (M12); Suction port S: 2 in SAE Code 61 flange (M12) |
| HYH10VSO 100 | ISO 3019-2 125-2 (pilot Ø125 mm) / SAE C 2-bolt (pilot Ø127.0 mm, 181.0 mm centers) | Splined shaft ANSI B92.1a 1-1/4 in 14T 12/24DP (Code S/R); Parallel keyed shaft Ø32 mm DIN 6885 (Code P) | Working port B: 1 in SAE Code 61 flange (M12); Suction port S: 2 in SAE Code 61 flange (M12) |
| HYH10VSO 140 | ISO 3019-2 125-2 (pilot Ø125 mm) / SAE C 2-bolt (pilot Ø127.0 mm, 181.0 mm centers) | Splined shaft ANSI B92.1a 1-1/2 in 17T 12/24DP (Code S/R); Parallel keyed shaft Ø40 mm DIN 6885 (Code P) | Working port B: 1-1/4 in SAE Code 61 flange (M14); Suction port S: 2-1/2 in SAE Code 61 flange (M12) |
| Direct Interchangeability and OEM Replacement Matrix (Rexroth A10VSO Series 31)
| Hengyuhang Series | OEM Target Model | OEM Series Specification | Interchangeability and Drop-In Compliance |
|---|---|---|---|
| HYH10VSO 18 / 31 | Bosch Rexroth A10VSO 18 / 31 | A10VSO 18 DFR1 / 31R-PPA12N00 | 100% direct dimensional, hydraulic, and mounting drop-in replacement; identical port locations, shaft spline, and control valves. |
| HYH10VSO 28 / 31 | Bosch Rexroth A10VSO 28 / 31 | A10VSO 28 DR / DFR / DFLR / 31R-VPA12N00 | Identical pilot Ø100 mm / SAE B mounting, 7/8 in 13T spline, SAE flange ports, and load-sensing performance. |
| HYH10VSO 45 / 31 | Bosch Rexroth A10VSO 45 / 31 | A10VSO 45 DFR1 / DFLR / 31R-VPA12N00 | Direct interchangeability on plastic injection machines and press brakes; identical pressure cut-off and flow characteristics. |
| HYH10VSO 71 / 31 | Bosch Rexroth A10VSO 71 / 31 | A10VSO 71 DR / DFR1 / DFLR / 31R-VPA12N00 | Direct bolt-on replacement for mobile and industrial power units; 1-1/4 in 14T spline and SAE C 2-bolt interface. |
| HYH10VSO 100 / 31 | Bosch Rexroth A10VSO 100 / 31 | A10VSO 100 DFR1 / DFLR / 31R-VPA42N00 | Direct replacement for heavy industrial presses and earthmoving equipment requiring intermediate 88 cm³/rev displacement. |
| HYH10VSO 140 / 31 | Bosch Rexroth A10VSO 140 / 31 | A10VSO 140 DR / DFR1 / DFLR / 31R-VPA12N00 | Direct drop-in replacement for high-tonnage industrial power packs; identical 1-1/2 in 17T drive shaft and 350 bar peak rating. |
| Through-Drive Tandems | Rexroth A10VSO + A10VSO / Gear | Through-drive codes K01, K02, K04, K07, K24 | Fully interchangeable rear mounting flanges and spline hubs for tandem combinations with secondary axial or gear pumps. |
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