GHP, ALP series marzocchi gear pump specifications
Marzocchi GHP series and ALP series gear pumps are its core products, which are widely used in industrial hydraulics, mobile equipment, new energy and other fields.The following comparative analysis is carried out from the three dimensions of performance parameters, application scenarios, and structural characteristics：
- Comparison of performance parameters
Parameter GHP series ALP series
Displacement range GHP1: smaller (please refer to the specification for details); GHP2: 4.5-28.2 cc/rev; GHP3: 20-87 cc/rev ALP1: 1.4-13.8 cc/rev; ALP2: 4.5-35.2 cc/rev; ALP3: 20-87 cc/rev
Pressure level Continuous pressure 280 bar, intermittent pressure 295 bar, peak pressure 310 bar ALP1: Commonly used pressure 250 bar, peak 290 bar; ALP2: commonly used 270 bar, peak 290 bar; ALP3: commonly used 230 bar, peak 270 bar
The speed range of GHP2 is up to 4000 rpm, and GHP3 is up to 3500 rpm. The maximum speed is not clearly marked, but the ALP1 speed range may cover 600-4000 rpm (refer to the ALP1-D-6 model)
The noise level is low and the noise is designed to optimize the gear meshing method. The noise parameters are not clearly marked, but the external meshing gear pump is generally noisy. - Adaptability of application scenarios
GHP series
GHP1: Compact structure, suitable for hydraulic systems with limited space (such as testing machinery, shoe-making machinery, precision hydraulic circuits).
GHP2: Balance flow and pressure, covering scenes such as plastic forming machines, construction hydraulic equipment, and small and medium-sized construction machinery.
GHP3: High-flow and high-pressure design, specially developed for high-load scenarios such as large-scale construction machinery and new energy equipment (such as wind power generation).
ALP series
ALP1: Lightweight design, suitable for low pressure and small flow scenarios (such as small hydraulic test benches, light mobile devices).
ALP2: Medium pressure and medium flow, covering general industrial fields such as plastic machinery and agricultural machinery.
ALP3: High pressure and large flow, but the pressure level is slightly lower than GHP3, which is suitable for cost-sensitive high-pressure applications (such as some construction machinery hydraulic systems).
- Structure and material advantages
GHP series
Gears and bearings: made of special steel, carburized and quenched, with high surface accuracy and strong wear resistance.
Pump body and end cap: high heat-resistant aluminum alloy die-casting, small deformation, suitable for high-pressure environments.
Sealing design: special pre-formed seals and anti-extrusion rings allow free axial/radial movement, reduce internal leakage and improve efficiency.
ALP series
Gear design: Some models adopt a double arc sinusoidal tooth shape to reduce pulsation and noise (such as ALP2A-D-13FG).
Safety valve: Equipped with differential pressure safety valve, the overload protection pressure is 1.5 times the rated pressure (such as ALP1-D-6 model).
Shaft end sealing: Two forms of mechanical sealing and packing sealing are provided, which can be flexibly adapted to different working conditions.
Fourth, selection suggestions
GHP series is preferred: if high pressure (≥280 bar continuous pressure), large flow (≥20 cc/rev) or long-term high-load operation (such as construction machinery and new energy equipment) is required.
Consider the ALP series: if the budget is limited and the pressure requirements of the application scenario are low (such as the commonly used pressure ≤270 bar), fast delivery may be required (some models of the ALP series are in sufficient stock).
Special needs：
Low-noise scenario: GHP series (optimized gear meshing) is preferred.
Space-limited scene: choose GHP1 series (compact structure).
Customized requirements: The ALP series provides more configuration options such as shaft end seals and safety valves.
