Internal Hydraulic Gear Pump 2APHF SAE A 2-Bolt Oval Flange Series

1. Overview of HENGYUHANG 2APHF Series Internal Hydraulic Gear Pumps

The HENGYUHANG 2APHF Series represents the pinnacle of low-noise, high-pressure internal gear fluid power engineering. Engineered with high-strength ductile cast iron housing and specialized internal conjugate gear geometry, the 2APHF pump incorporates active radial and axial gap compensation mechanisms to counteract internal pressure-induced deflections. This advanced architecture ensures that operational clearances remain optimal across fluctuating system pressures, oil viscosities, and operating temperatures, delivering sustained volumetric and mechanical efficiencies up to 93% while limiting audible emissions to an extraordinary 53 to 61 dB(A).

Covering 11 standardized displacement sizes from 4.2 up to 25.2 cm³/rev (2APHF-04 through 2APHF-25), the series delivers continuous operating pressures up to 28 MPa (280 bar / 4,060 psi) and peak spike pressures up to 32 MPa (320 bar / 4,640 psi). Engineered with a universal SAE "A" 2-bolt oval mounting flange (pilot Ø 82.55 mm with 106.4 mm bolt centers), the 2APHF series serves as a seamless, 100% drop-in replacement for HYDAC PGI101/PGI102/PGI103, ECKERLE EIPS2/EIPS3, and HOERBIGER internal gear pumps, enabling machinery builders and maintenance engineers to modernize noisy hydraulic circuits without piping or mounting bracket re-engineering.

2. Dimension of HENGYUHANG 2APHF SAE A 2-Bolt Oval Flange Series Internal Hydraulic Gear Pumps

Interface data needed with the drawing:

3. Pump Installation Specifications HENGYUHANG 2APHF Series

The HENGYUHANG 2APHF Series pump utilizes a standardized modular ordering code ensuring comprehensive interchangeability with leading European internal gear pumps:

Code structure — reference: 2APHF — High-Pressure Low-Noise Internal Gear Pump Series

Reading your replacement code:

| Techspecs of HENGYUHANG 2APHF Series

| Technical Performance Across Displacements

Noise measurement condition: n = 1,450 r/min, Δp = 25 MPa (250 bar), oil temperature T = 50 °C, mineral oil ISO VG46 anti-wear hydraulic fluid, measured at 1.0 m distance.

| Operating Conditions & Fluid Specifications

| Advantages of HENGYUHANG 2APHF Series

Dual Radial & Axial Gap Pressure Compensation: Incorporates floating sealing elements and a precision crescent partition that automatically compensate for thermal expansion and pressure deflections, maintaining volumetric efficiency above 91–93% across the entire service life.

Whisper-Quiet Acoustic Performance (53–60 dB): High-precision conjugate tooth meshing and optimized hydraulic port chambers drastically diminish pressure ripples, resulting in an exceptionally quiet operating environment ideal for indoor CNC machines and servo-driven hydraulic power units.

Ultra-Low Pressure & Flow Pulsation at Variable Speeds: Engineered to deliver stable, surge-free hydraulic output from as low as 200 r/min up to 3,000 r/min, making it the premier choice for modern energy-saving variable-speed servo motor drives.

High Pressure Capability up to 32 MPa (320 bar): Heavy-duty cast iron body structure delivers continuous rated pressure up to 28 MPa and intermittent peak pressure up to 32 MPa without risk of casing dilation.

Superior Fluid Contamination Tolerance: The robust hydrodynamic journal bearing design and internal gear meshing kinematics offer significantly higher resistance to fluid contamination compared to sensitive piston or vane pumps.

Modular Tandem Multi-Pump Capability: Supports multi-flow combinations through standardized intermediate coupling kits, enabling dual and triple pump configurations powered by a single drive shaft.

| Reference of HENGYUHANG 2APHF Series

| Series Architecture Across 2APHF Displacements

The HENGYUHANG 2APHF Internal Gear Pump family encompasses 11 displacement models organized into three primary operational brackets:

• Compact Ultra-High Pressure Range (4.2 – 7.9 cm³/rev, up to 32 MPa / 320 bar peak): 2APHF-04, 2APHF-05, 2APHF-06, 2APHF-08 (ultra-low noise 53–55 dB)

• Mid-Displacement Industrial Range (10.9 – 15.8 cm³/rev, up to 32 MPa / 320 bar peak): 2APHF-11, 2APHF-13, 2APHF-16 (noise 56–58 dB)

• High-Flow Servo Hydraulic Range (19.3 – 25.2 cm³/rev, up to 30 MPa / 300 bar peak): 2APHF-19, 2APHF-20, 2APHF-22, 2APHF-25 (noise 58–60 dB)

| Target Brand Interchangeability Matrix

The HENGYUHANG 2APHF Series provides seamless 1:1 drop-in replacement across the following major internal gear pump series:

• HYDAC: PGI101, PGI102, PGI103 Series Internal Gear Pumps (100% mounting pilot Ø 82.55 mm, 106.4 mm bolt pitch, and flanged port compatibility)

• ECKERLE: EIPS2 and EIPS3 Series High-Pressure Internal Gear Pumps (identical crescent seal gap compensation design and servo-hydraulic response)

• HOERBIGER: IPM, IPL, and IPH Series Industrial Internal Gear Pumps (exact displacement matching, 200–3000 rpm speed range, and 280–320 bar pressure ratings)

• VOITH Turbo: IPV 3 and IPN 3 Series Low-Noise Internal Gear Pumps

• BUCHER Hydraulics: QX2 and QX3 Series Internal Gear Pumps

| Brand Replacement

Quanzhou Hengyuhang Power Technology Co., Ltd. manufactures the 2APHF Series to exacting international tolerances, ensuring total mechanical and hydraulic interchangeability with HYDAC (PGI101/PGI102/PGI103), ECKERLE (EIPS2/EIPS3), and HOERBIGER internal gear pumps. Every manufactured unit undergoes 100% computerized end-of-line testing, including low-speed pulsation measurement, rated 28 MPa continuous pressure holding, and sound chamber acoustic profiling. Machine builders, hydraulic system integrators, and plant maintenance managers can directly replace OEM pumps with zero modifications to existing electric motor bells, shaft couplings, or manifold piping blocks.

| Applications of HENGYUHANG 2APHF Series

• Plastic Injection Moulding Machines: Energy-saving servo-electric and electro-hydraulic hybrid injection clamping and injection units.

• CNC Press Brakes & Sheet Metal Bending Machines: High-pressure, low-noise main cylinder actuation requiring micro-meter positioning accuracy and stable low-speed holding.

• Hydraulic Shearing Machines & Punch Presses: Continuous high-frequency cycling with extreme pressure spike absorption.

• Die-Casting Machinery: Core pulling, mould locking, and accumulator charging circuits.

• Industrial Automation Hydraulic Power Units: Indoor testing rigs, automotive assembly line clamping systems, and machine tool lubrication/actuation packages requiring strict ambient noise compliance (<60 dB).

| Package & Shipping

| 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 (>92–93%), 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"), 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, 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.