Gear pump
Internal Hydraulic Gear Pump PHF SAE 2-Bolt Series
Hengyuhang Internal Hydraulic Gear Pump 2PHF 3PHF 4PHF 5PHF Series is an advanced low-noise positive displacement internal gear pump featuring dual axial and radial gap pressure compensation for high volumetric efficiency and stable fluid power up to 33 MPa.
| Applications of Hengyuhang Internal Hydraulic Gear Pump 2PHF 3PHF 4PHF 5PHF Series
This high-pressure internal gear pump family is specifically engineered for precision industrial machinery and servo-hydraulic systems, including plastic injection moulding machines, CNC press brakes, shearing machines, punching presses, die-casting equipment, and heavy industrial automation power units. It delivers virtually pulsation-free hydraulic flow and whisper-quiet operation under severe continuous pressure cycles.
| Key Technical Specifications
Product Model: Hengyuhang Internal Hydraulic Gear Pump 2PHF 3PHF 4PHF 5PHF Series
Brand Replacement: HYDAC (PGI), ECKERLE (EIPS/EIPC/EIPH), HOERBIGER (HQI) OEM or as requested.
Displacement: 4CC-160CC cm³/rev (2PHF, 3PHF, 4PHF, 5PHF)
Rotation Direction: Clockwise (D), counter-clockwise (S)
Speed Range: Min. speed 100 to 200 rpm; Max. speed 1800 to 3000 rpm
Peak Pressure: 21 to 33 MPa (210 to 330 bar / 3,045 to 4,785 psi)
- Description
- Tecspecs
- Brand & Reference
- Download HENGYUHANG PHF Internal Hydraulic Gear Pump PDF
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| Overview of HENGYUHANG 2PHF 3PHF 4PHF 5PHF Series Internal Hydraulic Gear Pumps
The HENGYUHANG PHF Series represents the complete modular evolution of high-pressure, low-noise internal gear fluid power engineering. Encompassing four progressive frame sizes—2PHF (Group 2), 3PHF (Group 3), 4PHF (Group 4), and 5PHF (Group 5)—the series provides continuous fluid displacement from 4.2 cm³/rev up to an imposing 160.1 cm³/rev across 24 standardized displacement ratings. Engineered with heavy-duty high-density ductile cast iron housings, internal conjugate straight-cut gear sets, and a precision crescent fluid divider, every PHF pump incorporates dual radial and axial gap pressure compensation mechanisms. These active compensation elements dynamically adjust operating clearances in response to internal circuit pressure, fluid temperature changes, and oil viscosity variations, sustaining volumetric and mechanical efficiencies up to 93% across thousands of severe operating hours.
Designed to operate seamlessly with energy-saving variable-speed servo electric drives, the 2PHF–5PHF series maintains stable, pulsation-free pressure and volume delivery down to 100–200 r/min while operating at continuous pressures up to 30 MPa (300 bar / 4,350 psi) and peak spike pressures up to 33 MPa (330 bar / 4,785 psi). Operating acoustic sound levels remain remarkably quiet—ranging from 53 dB(A) on compact 2PHF units to 77 dB(A) on heavy 5PHF units. Engineered with standardized SAE 2-bolt oval mounting flanges (SAE A, SAE B, SAE C, and SAE D), the HENGYUHANG PHF family provides seamless 1:1 drop-in interchangeability for HYDAC PGI101/PGI102/PGI103, ECKERLE EIPS/EIPC/EIPH series, and HOERBIGER HQI2/HQI3 internal gear pumps without requiring piping redesign or motor bell-housing modifications.
| Dimension of HENGYUHANG 2PHF 3PHF 4PHF 5PHF Series Internal Hydraulic Gear Pumps
Interface data needed with the drawing across the 4 frame sizes:
| Frame Size | Mounting Flange Specification | Drive Shaft Options | Suction Port (Inlet S) | Pressure Port (Outlet P) | Tightening Torques |
|---|---|---|---|---|---|
| 2PHF (4.2 – 25.2 cm³/rev) | SAE "A" 2-bolt oval flange (pilot Ø 82.55 -0.05 mm / 3.25 in, 6 mm pilot depth; 106.4 mm / 4.189 in bolt centers, flange width 130 mm, height 112.7 mm) | 1. Cylindrical keyed: Ø 20.0 -0.007/-0.020 mm with 6.0 mm key, 41 mm extension. / 2. Involute spline: SAE 16/32-13T or SAE 16/32-10T. | 4-bolt flanged port: pitch C=40 mm (M6 depth 15 mm) for 04–16; pitch C=52.4 mm (M10 depth 17 mm) for 19–25. | 4-bolt flanged port: central bore Ø 14 mm with pitch 38.1 × 17.5 mm, 4-M8 threads depth 15 mm. | Flange bolt: 60 ±5 Nm; Body tie-rod: 45 ±3 Nm |
| 3PHF (24.8 – 63.1 cm³/rev) | SAE "B" 2-bolt oval flange (pilot Ø 101.6 -0.05 mm / 4.0 in, 6 mm pilot depth; 146.0 mm / 5.75 in bolt centers, flange width 170 mm) | 1. Cylindrical keyed: Ø 25.0 -0.007/-0.020 mm with 8.0 mm key, 46 mm extension. / 2. Involute spline: SAE 16/32-15T. | 4-bolt flanged port: central bore Ø 32 mm with 58.7 × 30.2 mm pitch, 4-M10 threads depth 17 mm. | 4-bolt flanged port: central bore ØD (18, 20, 25.4 mm) with pitch 47.5 × 22 mm or 52.4 × 26.2 mm, 4-M10 depth 17 mm. | Flange bolt: 100 ±8 Nm; Body tie-rod: 85 ±5 Nm |
| 4PHF (65.3 – 100.5 cm³/rev) | SAE "C" 2-bolt oval flange (pilot Ø 127.0 -0.05 mm / 5.0 in, 6 mm pilot depth; 181.0 mm / 7.126 in bolt centers, flange width 208 mm) | 1. Cylindrical keyed: Ø 32.0 -0.009/-0.034 mm with 10.0 mm key, 56 mm extension. / 2. Involute spline: SAE 12/24-14T. | 4-bolt flanged port: central bore ØF (47.2, 63.5 mm) with pitch 77.8 × 42.9 mm or 88.9 × 50.8 mm, 4-M12/M14 threads. | 4-bolt flanged port: central bore ØE (25.4, 31.8 mm) with pitch 57.2 × 27.8 mm (M12) or 66.7 × 31.8 mm (M14). | Flange bolt: 180 ±12 Nm; Body tie-rod: 140 ±8 Nm |
| 5PHF (80.0 – 160.1 cm³/rev) | SAE "D" 2-bolt oval flange (pilot Ø 152.4 -0.05 mm / 6.0 in, 9 mm pilot depth; 228.6 mm / 9.0 in bolt centers, flange width 263 mm) | 1. Cylindrical keyed: Ø 40.0 -0.009/-0.034 mm with 12.0 mm key, 70 mm extension. / 2. Involute spline: SAE 12/24-17T. | 4-bolt flanged port: central bore ØN (50, 63.5, 76.2 mm) with pitch L × M (M12/M16 threads depth 22–25 mm). | 4-bolt flanged port: central bore ØD (31.8, 38.1 mm) with pitch 69.9 × 35.7 mm (M12) or 79.4 × 36.5 mm (M16). | Flange bolt: 280 ±15 Nm; Body tie-rod: 220 ±12 Nm |
General interface rules: Flexible coupling connection mandatory; axial and radial forces not allowed on the standard drive shaft; coaxiality deviation must be strictly below 0.1 mm; angular deviation must be strictly below 1°.
| Pump Installation Specifications HENGYUHANG 2PHF–5PHF Series
The HENGYUHANG PHF Series pump utilizes a standardized modular ordering and replacement matrix:
Code structure — reference: [Frame]PHF — Modular High-Pressure Low-Noise Internal Gear Pump Series
| Segment | Meaning | Standard Options & Features |
|---|---|---|
| Series Frame | 2PHF / 3PHF / 4PHF / 5PHF | 2PHF: SAE A (4.2–25.2 cc); 3PHF: SAE B (24.8–63.1 cc); 4PHF: SAE C (65.3–100.5 cc); 5PHF: SAE D (80.0–160.1 cc) |
| Displacement | 04 to 160 | Specific nominal displacement code per frame size |
| Rotation | R / L | R: Clockwise (viewed from shaft end); L: Counter-clockwise |
| Drive Shaft | K / S | K: Cylindrical keyed shaft; S: Involute splined shaft (SAE standard spline matching frame size) |
| Mounting Flange | A2 / B2 / C2 / D2 | A2: SAE A 2-bolt; B2: SAE B 2-bolt; C2: SAE C 2-bolt; D2: SAE D 2-bolt |
| Port Type | F1 / G1 | F1: Metric 4-bolt flanged ports (standard); G1: Threaded BSPP / SAE O-ring boss ports |
| Seals Material | N / V | N: NBR (-20 °C to +80 °C); V: FKM / Viton (-10 °C to +150 °C) |
| Assembly Stage | S / D / T | S: Single pump; D: Tandem double pump; T: Triple pump combination |
| Reading your replacement code
| Your Target Brand & Series | HENGYUHANG PHF Equivalent | Interchange Verification Notes |
|---|---|---|
| HYDAC PGI101 / PGI102 / PGI103 Series | HENGYUHANG 2PHF & 3PHF Series | 100% mounting pilot, 2-bolt oval centers, shaft extension, and flanged port matching; identical low noise ratings |
| ECKERLE EIPS1 / EIPS2 / EIPS3 Series | HENGYUHANG 2PHF & 3PHF Series | Direct 1:1 drop-in replacement; identical crescent internal gap compensation geometry and servo response |
| ECKERLE EIPC3 / EIPC5 / EIPC6 Series | HENGYUHANG 3PHF & 4PHF Series | Full dimensional match across SAE B and SAE C platforms; rated pressure up to 25–30 MPa with peak 32 MPa |
| ECKERLE EIPH2 / EIPH3 / EIPH5 / EIPH6 Series | HENGYUHANG 2PHF, 3PHF, 4PHF, 5PHF | Covers the entire displacement spectrum up to 160 cm³/rev; continuous 30 MPa and peak 33 MPa capability |
| HOERBIGER HQI2 / HQI3 Industrial Series | HENGYUHANG 2PHF & 3PHF Series | Form, fit, and functional replacement; matching bolt patterns, shaft splines/keys, and quiet operating acoustic profile |
| VOITH IPV 3 / 4 / 5 / 6 & IPN Series | HENGYUHANG 2PHF, 3PHF, 4PHF, 5PHF | Direct envelope replacement for high-pressure machine tool HPUs and plastic injection machines |
| BUCHER QX2 / QX3 / QX4 / QX5 Series | HENGYUHANG 2PHF, 3PHF, 4PHF, 5PHF | Equivalent conjugate tooth profile, low pulsation, and tandem multi-pump modular compatibility |
Techspecs — HENGYUHANG 2PHF–5PHF Series
2PHF Series Technical Data (SAE A 2-Bolt Flange)
| Model | Theoretical Displacement (cm³/rev) | Rated Pressure (MPa / bar) | Max. Peak Pressure (MPa / bar) | Speed Range (r/min) | Volumetric Efficiency (%) | Mechanical Efficiency (%) | Weight (kg) | Noise Level @1450 rpm, 25 MPa (dB) |
|---|---|---|---|---|---|---|---|---|
| 2PHF4 | 4.2 | 28 / 280 | 32 / 320 | 200 – 3,000 | 88 | 88 | 2.9 | 53 |
| 2PHF5 | 5.4 | 28 / 280 | 32 / 320 | 200 – 3,000 | 91 | 91 | 2.9 | 53 |
| 2PHF6 | 6.4 | 28 / 280 | 32 / 320 | 200 – 3,000 | 92 | 92 | 3.0 | 54 |
| 2PHF8 | 7.9 | 28 / 280 | 32 / 320 | 200 – 3,000 | 92 | 92 | 3.1 | 55 |
| 2PHF11 | 10.9 | 28 / 280 | 32 / 320 | 200 – 3,000 | 92 | 92 | 3.3 | 56 |
| 2PHF13 | 13.3 | 28 / 280 | 32 / 320 | 200 – 3,000 | 92 | 92 | 3.5 | 57 |
| 2PHF16 | 15.8 | 28 / 280 | 32 / 320 | 200 – 3,000 | 92 | 92 | 3.6 | 58 |
| 2PHF19 | 19.3 | 28 / 280 | 30 / 300 | 200 – 2,800 | 93 | 93 | 3.8 | 58 |
| 2PHF20 | 20.1 | 25 / 250 | 30 / 300 | 200 – 2,800 | 93 | 93 | 4.0 | 59 |
| 2PHF22 | 22.2 | 25 / 250 | 30 / 300 | 200 – 2,800 | 93 | 93 | 4.0 | 59 |
| 2PHF25 | 25.2 | 25 / 250 | 28 / 280 | 200 – 2,500 | 93 | 93 | 4.2 | 60 |
3PHF Series Technical Data (SAE B 2-Bolt Flange)
| Model | Theoretical Displacement (cm³/rev) | Rated Pressure (MPa / bar) | Max. Peak Pressure (MPa / bar) | Speed Range (r/min) | Volumetric Efficiency (%) | Mechanical Efficiency (%) | Weight (kg) | Noise Level @1450 rpm, 25 MPa (dB) |
|---|---|---|---|---|---|---|---|---|
| 3PHF25 | 24.8 | 25 / 250 | 32 / 320 | 200 – 3,000 | 92 | 92 | 8.6 | 63 |
| 3PHF32 | 32.1 | 25 / 250 | 32 / 320 | 200 – 3,000 | 92 | 92 | 9.2 | 64 |
| 3PHF40 | 40.1 | 25 / 250 | 30 / 300 | 100 – 2,500 | 93 | 93 | 9.8 | 65 |
| 3PHF50 | 50.3 | 25 / 250 | 28 / 280 | 100 – 2,200 | 93 | 93 | 10.5 | 66 |
| 3PHF63 | 63.1 | 18 / 180 | 21 / 210 | 100 – 1,800 | 93 | 93 | 11.2 | 64* |
| Note: 3PHF-63 noise measured at Δp = 18 MPa. | ||||||||
4PHF Series Technical Data (SAE C 2-Bolt Flange)
| Model | Theoretical Displacement (cm³/rev) | Rated Pressure (MPa / bar) | Max. Peak Pressure (MPa / bar) | Speed Range (r/min) | Volumetric Efficiency (%) | Mechanical Efficiency (%) | Weight (kg) | Noise Level @1450 rpm, 25 MPa (dB) |
|---|---|---|---|---|---|---|---|---|
| 4PHF64 | 65.3 | 25 / 250 | 30 / 300 | 100 – 3,000 | 92 | 92 | 11.5 | 67 |
| 4PHF80 | 80.4 | 25 / 250 | 30 / 300 | 100 – 3,000 | 93 | 93 | 13.0 | 68 |
| 4PHF100 | 100.5 | 23 / 230 | 28 / 280 | 100 – 2,500 | 93 | 93 | 13.5 | 69 |
5PHF Series Technical Data (SAE D 2-Bolt Flange)
| Model | Theoretical Displacement (cm³/rev) | Rated Pressure (MPa / bar) | Max. Peak Pressure (MPa / bar) | Speed Range (r/min) | Volumetric Efficiency (%) | Mechanical Efficiency (%) | Weight (kg) | Noise Level @1450 rpm, 25 MPa (dB) |
|---|---|---|---|---|---|---|---|---|
| 5PHF80 | 80.0 | 30 / 300 | 33 / 330 | 200 – 2,500 | 91 | 90 | 47.0 | 75 |
| 5PHF100 | 101.2 | 30 / 300 | 33 / 330 | 200 – 2,500 | 92 | 90 | 50.0 | 76 |
| 5PHF125 | 125.7 | 30 / 300 | 33 / 330 | 200 – 2,500 | 92 | 90 | 54.0 | 76 |
| 5PHF145 | 145.3 | 25 / 250 | 28 / 280 | 200 – 2,000 | 93 | 90 | 57.0 | 77 |
| 5PHF160 | 160.1 | 25 / 250 | 28 / 280 | 200 – 2,000 | 93 | 91 | 60.0 | 77 |
General Operating Conditions Across PHF Series
| Parameter | Specification | Standard Requirement |
|---|---|---|
| Operating fluid | Hydraulic oil | ISO VG 46 to VG 68 mineral anti-wear hydraulic oil |
| Fluid operating temperature | Continuous range | t = -20 °C to +80 °C (standard NBR seals); optional FKM seals for up to +150 °C |
| Kinematic operating viscosity | Permissible range | ν = 10 to 300 mm²/s (cSt); optimal continuous: ν = 20 to 80 mm²/s |
| Suction port pressure | Inlet pressure range | p_inlet = 0.06 to 0.20 MPa (0.6 to 2.0 bar absolute) |
| Fluid cleanliness level | Maximum contamination | Class 9 according to NAS 1638 or Class 20/18/15 according to ISO 4406 |
| Sound testing baseline | Test standard | n = 1,450 r/min, Δp = 25 MPa (or 18 MPa), oil temperature 50 °C, 46# oil, measured at 1 m |
Advantages — HENGYUHANG 2PHF–5PHF Series
Dual Radial & Axial Gap Pressure Compensation
Incorporates specialized floating sealing segments and precision crescent partitions that dynamically compensate for mechanical deflection and thermal expansion, ensuring sustained volumetric efficiency above 91–93% across thousands of hours.
Ultra-Low Acoustic Noise Profile (53–77 dB)
Internal straight conjugate gear meshing combined with optimized hydraulic silencing chambers drastically diminishes pressure pulsations, creating a virtually silent indoor working environment.
Near-Zero Flow & Pressure Pulsation at Low Speeds
Stable hydraulic pressure and volume are maintained down to 100–200 r/min, making the PHF series perfectly suited for modern energy-saving variable-speed servo motor drives.
Extreme High Continuous Pressure up to 30 MPa (Peak 33 MPa / 330 bar)
Robust spheroidal ductile cast iron body structure eliminates housing dilation under severe cyclic hydraulic loading.
Superior Insensitivity to Oil Contamination
Robust hydrodynamic sleeve bearings and internal gear kinematics provide dramatically longer operating life in harsh industrial conditions compared to contamination-sensitive axial piston or vane pumps.
Modular Multi-Pump Tandem Assemblies
Standardized intermediate coupling interfaces permit single, double, or triple pump configurations (e.g., 2PHF+2PHF, 3PHF+2PHF, 4PHF+2PHF, 5PHF+3PHF) driven by a single electric motor.
6. Reference of HENGYUHANG 2PHF–5PHF Series
6.1 Series Architecture Across 4 Frame Sizes
The HENGYUHANG PHF Series provides complete displacement coverage across four structured frame sizes:
2PHF Series (SAE A 2-Bolt Flange, 4.2 – 25.2 cm³/rev): 11 displacements (04, 05, 06, 08, 11, 13, 16, 19, 20, 22, 25), peak pressure up to 32 MPa, noise 53–60 dB.
3PHF Series (SAE B 2-Bolt Flange, 24.8 – 63.1 cm³/rev): 5 displacements (25, 32, 40, 50, 63), peak pressure up to 32 MPa, noise 63–66 dB.
4PHF Series (SAE C 2-Bolt Flange, 65.3 – 100.5 cm³/rev): 3 displacements (64, 80, 100), peak pressure up to 30 MPa, noise 67–69 dB.
5PHF Series (SAE D 2-Bolt Flange, 80.0 – 160.1 cm³/rev): 5 displacements (80, 100, 125, 145, 160), peak pressure up to 33 MPa, noise 75–77 dB.
6.2 Target Brand Interchangeability Matrix
The HENGYUHANG 2PHF–5PHF Series provides verified 1:1 drop-in replacement across the following international internal gear pump models:
HYDAC: PGI101, PGI102, PGI103 Series Internal Gear Pumps (100% pilot, 2-bolt oval mounting, shaft, and port match)
ECKERLE: EIPS1, EIPS2, EIPS3 Series (compact low-noise internal gear pumps)
ECKERLE: EIPC3, EIPC5, EIPC6 Series (mid-to-high pressure industrial internal gear pumps)
ECKERLE: EIPH2, EIPH3, EIPH5, EIPH6 Series (high-pressure heavy industrial internal gear pumps up to 330 bar)
HOERBIGER: HQI2 and HQI3 Series (servo-hydraulic press brake and bending machine internal gear pumps)
VOITH Turbo: IPV 3, IPV 4, IPV 5, IPV 6 and IPN Series Low-Noise Internal Gear Pumps
BUCHER Hydraulics: QX2, QX3, QX4, QX5 Series Internal Gear Pumps
7. Brand Replacement
Quanzhou Hengyuhang Power Technology Co., Ltd. manufactures the 2PHF, 3PHF, 4PHF, and 5PHF Series conforming precisely to European and American SAE mounting dimensions. Every single pump undergoes automated end-of-line digital testing, verifying volumetric efficiency, continuous rated pressure holding, low-speed pulsation consistency, and sound chamber decibel limits. Machinery manufacturers, servo hydraulic system integrators, and replacement maintenance engineers can replace original HYDAC, ECKERLE, and HOERBIGER units with zero piping rework or mounting bracket alterations. Multi-flow tandem assemblies and custom shaft configurations are fully supported.
8. Applications of HENGYUHANG 2PHF–5PHF Series
Plastic Injection Moulding Machines: Energy-efficient servo-electric and electro-hydraulic hybrid clamping, injection, and plasticizing drives.
CNC Press Brakes & Sheet Metal Bending Machines: High-pressure, low-noise main cylinder servo actuation requiring stable low-speed holding down to 100 rpm.
Hydraulic Shearing Machines & Punching Presses: Fast cycling operations with heavy pressure spike absorption up to 33 MPa.
Die-Casting Machines: High-speed injection, core pulling, and accumulator pre-charging systems.
Automated Industrial Test Benches & Central HPUs: Indoor manufacturing facilities where strict environmental noise regulations (<65 dB) are enforced.
9. Package & Shipping
| Item | Details |
|---|---|
| Packaging | Individual shock-absorbing custom molded foam in heavy-duty export cartons; moisture-resistant VCI polybags; fumigation-free wooden export pallets for consolidated freight. |
| Selling Unit | Single item (MOQ: 1 piece for standard stock models; low MOQ for customized OEM tandem assemblies). |
| Single Package Size | 2PHF: 28 × 20 × 18 cm; 3PHF: 35 × 25 × 22 cm; 4PHF: 42 × 30 × 26 cm; 5PHF: 55 × 38 × 35 cm. |
| Single Gross Weight | 2PHF: 3.5–5.0 kg; 3PHF: 9.5–12.5 kg; 4PHF: 13.0–15.5 kg; 5PHF: 50.0–65.0 kg. |
| Standard Lead Time | 3–5 business days for stock items; 15–20 business days for volume OEM batch customization. |
| Logistics & Express | Worldwide air express (DHL, FedEx, UPS, TNT), air cargo, maritime shipping (LCL / FCL), and multimodal door-to-door DDP services. |
| Customization Services | Custom laser nameplate marking, private branding, multi-pump tandem combinations, customized shaft splines, and special seal compounds. |
| Warranty & Support | 12 months comprehensive warranty from dispatch date; full lifetime technical support. |
10. Why Choose Hengyuhang?
Direct Factory Precision Manufacturing & CNC Excellence: Equipped with multi-axis CNC machining centers, high-precision internal gear shaper-grinders, and automated micro-lapping equipment, Hengyuhang maintains sub-micron tooth profile tolerances (Ra < 0.2 μm) and exact crescent seal clearances. This guarantees minimal internal bypass leakage, virtually zero pressure pulsation, and repeatable performance across high-volume production batches.
100% Full-Cycle Multi-Parameter Factory Inspection: Every single hydraulic pump undergoes rigorous end-of-line digital testing before dispatch. Quality checks cover full continuous rated and peak pressure hold, internal bypass leakage verification, high/low temperature volumetric efficiency testing (>91–93%), and acoustic noise spectrum profiling in dedicated sound testing chambers, ensuring zero-defect delivery.
Seamless 1:1 OEM Drop-In Interchangeability: Conforming precisely to international European standard, SAE ("AA", "A", "B", "C", "D"), and DIN/ISO mounting configurations, our pumps deliver genuine plug-and-play replacement for HYDAC, ECKERLE, HOERBIGER, and other leading global manufacturers. Machine operators can replace original units without modifying bell housings, drive couplings, or hydraulic line geometry.
Flexible Engineering Customization & Rapid Prototyping: Backed by an experienced in-house hydraulic engineering team, Hengyuhang offers comprehensive bespoke customization, including non-standard mounting flanges, special shaft tapers or splines, multi-pump tandem assemblies with common suction ports, and integrated valve blocks. We support low-MOQ trial orders and agile custom prototyping to resolve obsolescence issues for high-end machinery.
Robust Supply Chain, Extensive Inventory & Fast Global Dispatch: With dedicated casting and precision machining facilities, high-strength ductile cast iron reserves, and extensive finished inventory across all displacement models (2PHF to 5PHF), standard orders ship within 48 to 72 hours. We partner strategically with major international logistics carriers to provide seamless door-to-door DDP global delivery.
12-Month Comprehensive Warranty & Lifetime Technical Support: All Hengyuhang hydraulic pumps are backed by a complete 12-month factory warranty and dedicated lifetime technical assistance. Our specialized fluid power engineers provide free 24-hour CAD drawing verification, OEM cross-reference confirmation, hydraulic displacement calculations, and system troubleshooting to ensure total operational peace of mind.
Internal Hydraulic Gear Pump PHF Series (2PHF / 3PHF / 4PHF / 5PHF) SAE 2-Bolt Oval Flange Series (4.2–160.1 cm³/rev) is a comprehensive family of high-pressure, ultra-low-noise internal conjugate gear pumps designed for servo electro-hydraulic machinery, industrial presses, and precision plastic injection moulding systems. Engineered with advanced radial and axial hydraulic gap compensation, high-rigidity ductile cast iron housings, and precision internal gear kinematics, this series spans 4 distinct frame groups across 24 standard displacement sizes: Group 2PHF (4.2–25.2 cm³/rev), Group 3PHF (24.8–65.3 cm³/rev), Group 4PHF (65.3–100.5 cm³/rev), and Group 5PHF (80.0–160.1 cm³/rev). Delivering continuous rated pressures up to 30 MPa (300 bar) and peak operating pressures up to 33 MPa (330 bar), the PHF family features whisper-quiet noise levels (53 to 77 dB), volumetric and mechanical efficiencies reaching 93%, and standardized SAE 2-bolt oval mounting flanges (SAE A, SAE B, SAE C, and SAE D) with both straight cylindrical keyed and SAE involute splined drive shafts.
| Applications
The PHF internal gear pump family is specifically designed for high-performance, low-pulsation, and energy-efficient electro-hydraulic servo systems, including servo-driven plastic injection moulding machines, rubber vulcanizing and forming presses, CNC servo hydraulic press brakes, die-casting machines, industrial material handling and electric forklifts, precision automated testing equipment, theatrical and industrial scissor lifts, machine tool hydraulic clamping fixtures, and variable-speed servo hydraulic power packs operating under strict environmental acoustic limits.
| Family Overview & Mounting Interface Comparison
| Series Group | Displacement Range (cm³/rev) | Rated Pressure (MPa) | Max. Pressure (MPa) | Noise Level (dB) | SAE 2-Bolt Flange Pilot | Bolt Center Distance | Drive Shaft Options |
|---|---|---|---|---|---|---|---|
| 2PHF | 4.2 ~ 25.2 (11 sizes) | 25 ~ 28 MPa | 28 ~ 32 MPa | 53 ~ 60 dB | SAE A (Ø82.55 mm) | 106.4 mm (width 130 mm) | Ø20 mm Keyed / SAE 16/32-13T & 10T |
| 3PHF | 24.8 ~ 65.3 (6 sizes) | 18 ~ 25 MPa | 21 ~ 32 MPa | 63 ~ 67 dB | SAE B (Ø101.6 mm) | 146.0 mm (width 170 mm) | Ø25 mm Keyed / SAE 16/32-15T Spline |
| 4PHF | 65.3 ~ 100.5 (3 sizes) | 23 ~ 25 MPa | 28 ~ 30 MPa | 67 ~ 69 dB | SAE C (Ø127.0 mm) | 181.0 mm (width Ø208 mm) | Ø32 mm Keyed / SAE 12/24-14T Spline |
| 5PHF | 80.0 ~ 160.1 (5 sizes) | 25 ~ 30 MPa | 28 ~ 33 MPa | 75 ~ 77 dB | SAE D (Ø152.4 mm) | 228.6 mm (width Ø263 mm) | Ø40 mm Keyed / SAE 12/24-17T Spline |
| 2PHF Series Technical Specifications (SAE A 2-Bolt)
| Model Code | 04 | 05 | 06 | 08 | 11 | 13 | 16 | 19 | 20 | 22 | 25 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Theor. Displacement (cm³/rev) | 4.2 | 5.4 | 6.4 | 7.9 | 10.9 | 13.3 | 15.8 | 19.3 | 20.1 | 22.2 | 25.2 |
| Rated Pressure (MPa) | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 25 | 25 | 25 | 25 |
| Max. Peak Pressure (MPa) | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 30 | 30 | 30 | 28 |
| Speed Range (r/min) | 200 ~ 3000 | 200 ~ 2800 | 200 ~ 2500 | ||||||||
| Volumetric / Mech. Eff. (%) | 88 / 88 | 91 / 91 | 92 / 92 | 92 / 92 | 92 / 92 | 92 / 92 | 93 / 93 | 93 / 93 | 93 / 93 | 93 / 93 | 93 / 93 |
| Noise Level (dB) | 53 | 53 | 54 | 55 | 56 | 57 | 58 | 58 | 59 | 59 | 60 |
| Net Weight (kg) | 2.9 | 2.9 | 3.0 | 3.1 | 3.3 | 3.5 | 3.6 | 3.8 | 4.0 | 4.0 | 4.2 |
| Length A / Port Center B (mm) | 109.5 / 55 | 109.5 / 55 | 111.5 / 56 | 114.5 / 57.5 | 120.5 / 60.5 | 125.5 / 63 | 130.5 / 65.5 | 137.5 / 69 | 143.5 / 72 | 143.5 / 72 | 149.5 / 75 |
| 3PHF Series Technical Specifications (SAE B 2-Bolt)
| Model Code | 25 | 32 | 40 | 50 | 63 | 64 |
|---|---|---|---|---|---|---|
| Theor. Displacement (cm³/rev) | 24.8 | 32.1 | 40.1 | 50.3 | 63.1 | 65.3 |
| Rated Pressure (MPa) | 25 | 25 | 25 | 25 | 18 | 25 |
| Max. Peak Pressure (MPa) | 32 | 30 | 30 | 28 | 21 | 30 |
| Speed Range (r/min) | 200 ~ 3000 | 100 ~ 2500 | 100 ~ 2500 | 100 ~ 2200 | 100 ~ 1800 | 100 ~ 3000 |
| Volumetric / Mech. Eff. (%) | 92 / 92 | 92 / 92 | 92 / 92 | 93 / 93 | 93 / 93 | 92 / 92 |
| Noise Level (dB) | 63 | 64 | 65 | 66 | 64 | 67 |
| Net Weight (kg) | 8.6 | 9.2 | 9.8 | 10.5 | 11.2 | 11.5 |
| Body Dimension A (mm) | 65 | 75 | 86 | 100 | 118 | 81 |
| 4PHF & 5PHF Heavy Series Technical Specifications (SAE C & SAE D)
| Group 4PHF (SAE C 2-Bolt Flange Ø127 mm) | Group 5PHF (SAE D 2-Bolt Flange Ø152.4 mm) | |||||||
|---|---|---|---|---|---|---|---|---|
| Model Code | 64 | 80 | 100 | 80 | 100 | 125 | 145 | 160 |
| Theor. Displ. (cm³/rev) | 65.3 | 80.4 | 100.5 | 80.0 | 101.2 | 125.7 | 145.3 | 160.1 |
| Rated Pressure (MPa) | 25 | 25 | 23 | 30 | 30 | 25 | 25 | 25 |
| Max. Pressure (MPa) | 30 | 30 | 28 | 33 | 33 | 28 | 28 | 28 |
| Speed Range (r/min) | 100~3000 | 100~3000 | 100~2500 | 200~2500 | 200~2500 | 200~2500 | 200~2000 | 200~2000 |
| Volumetric Eff. (%) | 92 | 93 | 93 | 91 | 92 | 92 | 93 | 93 |
| Mechanical Eff. (%) | 92 | 93 | 93 | 90 | 90 | 90 | 90 | 91 |
| Noise Level (dB) | 67 | 68 | 69 | 75 | 76 | 76 | 77 | 77 |
| Net Weight (kg) | 11.5 | 13.0 | 13.5 | 47.0 | 50.0 | 54.0 | 57.0 | 60.0 |
| Body Dimension A (mm) | 81 | 93 | 109 | 87 | 100 | 115 | 127 | 136 |
* Note: All noise ratings were measured at n=1450 r/min, Δp=25 MPa (18 MPa on 3PHF-63), T=50°C using ISO VG46 anti-wear hydraulic oil at 1 m test distance.
| Operating Conditions & Fluid Parameters
| Condition Parameter | Operational Standard |
|---|---|
| Working Fluid | ISO VG46 ~ VG68 anti-wear mineral hydraulic oil |
| Operating Viscosity Range | 10 ~ 300 mm²/s (cSt) |
| Operating Temperature Range | -20°C to +80°C |
| Suction Port Pressure Range | 0.06 ~ 0.20 MPa |
| Cleanliness Requirement | NAS 1638 Class 9 or ISO 4406 Class 20/18/15 |
PHF Series Internal Gear Pumps — Complete Model List
2PHF Series — Available Models
| Type |
|---|
| 2PHF04 |
| 2PHF05 |
| 2PHF06 |
| 2PHF08 |
| 2PHF11 |
| 2PHF13 |
| 2PHF16 |
| 2PHF19 |
| 2PHF20 |
| 2PHF22 |
| 2PHF25 |
3PHF Series — Available Models
| Type |
|---|
| 3PHF25 |
| 3PHF32 |
| 3PHF40 |
| 3PHF50 |
| 3PHF63 |
4PHF Series — Available Models
| Type |
|---|
| 4PHF64 |
| 4PHF80 |
| 4PHF100 |
5PHF Series — Available Models
| Type |
|---|
| 5PHF80 |
| 5PHF100 |
| 5PHF125 |
| 5PHF145 |
| 5PHF160 |
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