Marzocchi gear pump ALP-GHP series
Marzocchi Gear Pump ALP-GHP Series – Models and Parameters
Marzocchi ALP-GHP series consists of high-pressure external gear pumps, including ALP series, GHP series and ALP-GHP combination pump series. Founded in 1961, Marzocchi has become one of the world’s leading manufacturers of gear pumps and gear motors, providing high-quality products for industrial and mobile hydraulic systems. The ALP series is characterized by die-cast construction, while the GHP series adopts heavy-duty cast iron design, and the combination series integrates the advantages of both, with displacement ranging from 1.4 cc/rev to 87 cc/rev and max continuous working pressure up to 250 bar. The following are the detailed models and parameters of each series.
1. ALP Series
The ALP series is a light-duty to medium-duty gear pump series, divided into 4 groups (ALP 1 to ALP 4) with compact structure and die-cast flanges and covers. It is suitable for compact industrial and mobile hydraulic systems, featuring high efficiency, low noise and easy installation.
1.1 Models and Detailed Parameters
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Model Series
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Displacement Range (cc/rev)
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Flow at 1500 rev/min (L/min)
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Max Continuous Pressure (bar)
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Max Peak Pressure (bar)
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Max Speed (rpm)
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ALP 1, ALP 1A
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1.4 – 13.8
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2.1 – 20.7
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250
|
270
|
4000
|
|
ALP 2, ALP 2A
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4.5 – 35.2
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6.8 – 52.8
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250
|
290
|
4000
|
|
ALP 3, ALP 3A
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20 – 87
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30 – 130.5
|
230
|
270
|
3500
|
|
ALP 4
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35 – 100
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52.5 – 150
|
200
|
240
|
3000
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Key Notes: Typical models of ALP series include ALP1-D-2-FG, ALP1-D-3-FG, ALP1A-D-4-FG, ALP2-D-6-FG, ALP2A-D-9-FG, etc.. The ALP series adopts die-cast aluminum alloy housing, with compact structure and light weight, suitable for applications with limited installation space. The max continuous backpressure is 6 bar, and the max drain line pressure is 6 bar. Proper filtering of the hydraulic system is required to ensure product performance.
2. GHP Series
The GHP series is a heavy-duty gear pump series, divided into 3 groups (GHP 1 to GHP 3) with cast iron flanges and covers, featuring high load-bearing capacity and excellent wear resistance. It is widely used in heavy-duty industrial and mobile hydraulic systems requiring high power output.
2.1 Models and Detailed Parameters
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Model Series
|
Displacement Range (cc/rev)
|
Flow at 1500 rev/min (L/min)
|
Max Continuous Pressure (bar)
|
Max Peak Pressure (bar)
|
Max Speed (rpm)
|
|
GHP 1, GHP 1A
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1.4 – 13.8
|
2.1 – 20.7
|
250
|
270
|
4000
|
|
GHP 2, GHP 2A
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4.5 – 50
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6.8 – 75
|
250
|
290
|
4000
|
|
GHP 3, GHP 3A
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20 – 87
|
30 – 130.5
|
250
|
270
|
3500
|
Key Notes: Typical models of GHP series include GHP1-D-2-FG, GHP1A-D-3-FG, GHP2-D-6-FG, GHP2A-D-13-FG, GHP3A-D-40, etc.. The GHP series adopts heavy-duty cast iron construction, with strong load-bearing capacity and good corrosion resistance. The max continuous backpressure is 6 bar, and the max drain line pressure is 6 bar. It is equipped with reinforced bearings to ensure stable operation under heavy load.
3. ALP-GHP Combination Pump Series
The ALP-GHP combination pump series integrates the advantages of ALP and GHP series, including two-stage and three-stage pumps with shortened axial length, suitable for narrow installation spaces such as mobile machinery and compact industrial hydraulic systems. ALP-GHP combination pumps can be customized according to application needs[3].
3.1 Models and Key Parameters
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Model Series
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Displacement Range (cc/rev)
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Max Continuous Pressure (bar)
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Max Speed (rpm)
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Structure Type
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Key Features
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ALP1-GHP1
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2.8 – 27.6
|
250
|
4000
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Two-stage
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Compact, light weight, suitable for small hydraulic systems
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|
ALP2-GHP2
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9 – 85.2
|
250
|
4000
|
Two-stage/Three-stage
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Medium load, wide application range
|
|
ALP3-GHP3
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40 – 174
|
230
|
3500
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Two-stage/Three-stage
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Heavy load, high power output
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Key Notes: The ALP-GHP combination pump series also includes models such as 0.25-0.5 and ALP4. It adopts a common inlet design (one inlet supplies two or three components) to simplify the hydraulic system structure. The axial length is shortened to adapt to narrow installation spaces, and the number of stages can be extended to more than three according to requirements[3].
General Specifications of ALP-GHP Series
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Design: External gear pump, simple structure, low maintenance cost and long service life. ALP series is die-cast, GHP series is heavy-duty cast iron, and combination series is short-type multi-stage design.
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Hydraulic Fluid: Suitable for standard hydraulic fluids; proper filtering of the hydraulic system is required to ensure product performance and service life. The recommended filter fineness is ≤10 μm.
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Rotation Direction: Available in left (ALP/GHP…L) and right (ALP/GHP…D) configurations; the rotation direction is reversible, with stable performance during forward and reverse rotation.
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Installation: Follow the installation guidelines provided by Marzocchi to ensure proper connection of supply and delivery lines, avoid fluid turbulence, and ensure the pump is firmly fixed. The installation flange and shaft connection should be aligned to prevent eccentricity.
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Material: ALP series – die-cast aluminum alloy housing; GHP series – cast iron flanges and covers, special steel gears; combination series – integrated die-cast and cast iron structure, ensuring high strength and corrosion resistance.
