Bosch Rexroth gear pump PGH4-3X model and parameters
1. General Introduction
The Bosch Rexroth PGH4-3X series is a range of gap-compensated fixed-displacement internal gear pumps, belonging to the 3X component series with frame size 4. Its core function is to convert mechanical energy into hydraulic energy for open-circuit industrial applications, featuring involute tooth system that ensures low flow and pressure pulsation, thus achieving low-noise operation. Equipped with axial and radial gap compensation technology, the series maintains high volumetric efficiency throughout its service life, and is suitable for broad viscosity and speed ranges. It is widely used in high-power, high-pressure applications such as plastics processing machines, automated presses, and foundry machines, with flexible configurations to meet diverse installation requirements. The pump adopts a modular design for easy maintenance and can be combined with other types of pumps such as vane pumps and axial piston pumps to form a multi-pump system.
2. Key General Specifications
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Pump Type: Internal gear pump, fixed displacement, gap-compensated
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Frame Size: 4 (BG4)
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Component Series: 3X (installation and connection dimensions remain unchanged for component series 30-39)
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Nominal Pressure: Up to 315 bar (for most displacements), maximum operating pressure up to 350 bar
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Displacement Range: 20.10 – 50.70 cm³/rev (specific to PGH4-3X series)
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Tooth System: Involute tooth system, ensuring low flow and pressure pulsation
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Bearing Type: Hydrodynamic lubricated radial sliding bearings
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Installation Position: No restrictions, flexible installation
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Ambient Temperature Range: -20 °C to +80 °C
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Cleanliness Requirement: Grade 11 (conforming to ISO 4406:1999) for factory delivery
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Housing Material: Ductile iron, improving impact fatigue strength by 40% compared with ordinary gray iron
3. Main Models and Detailed Parameters
|
Model
|
Displacement (cm³/rev)
|
Rotation Direction
|
Drive Shaft
|
Flange Type
|
Sealing Material
|
Part Number
|
|---|---|---|---|---|---|---|
|
PGH4-3X/020RE11VU2
|
20.10
|
Clockwise (R)
|
SAE involute spline (R)
|
SAE flange high-pressure series (11), ISO 4-hole mounting flange (U2)
|
FKM (V)
|
R901147100[2][3]
|
|
PGH4-3X/025RE11VU2
|
25.30
|
Clockwise (R)
|
SAE involute spline (R)
|
SAE flange high-pressure series (11), ISO 4-hole mounting flange (U2)
|
FKM (V)
|
R901147101[2][3]
|
|
PGH4-3X/032RE11VU2
|
32.70
|
Clockwise (R)
|
SAE involute spline (R)
|
SAE flange high-pressure series (11), ISO 4-hole mounting flange (U2)
|
FKM (V)
|
R901147102[2][3][5]
|
|
PGH4-3X/040RE11VU2
|
40.10
|
Clockwise (R)
|
SAE involute spline (R)
|
SAE flange high-pressure series (11), ISO 4-hole mounting flange (U2)
|
FKM (V)
|
R901147103[2][3][4]
|
|
PGH4-3X/050RE11VU2
|
50.70
|
Clockwise (R)
|
SAE involute spline (R)
|
SAE flange high-pressure series (11), ISO 4-hole mounting flange (U2)
|
FKM (V)
|
R901147104[2][3]
|
4. Pressure and Speed Parameters (Series General)
|
Displacement (cm³/rev)
|
Max Continuous Pressure (bar)
|
Max Intermittent Pressure (bar)
|
Max Pressure Peaks (bar)
|
Min Rotational Speed (rpm)
|
Max Rotational Speed (rpm)
|
|---|---|---|---|---|---|
|
20.10
|
315
|
330
|
350
|
500 (at ν=12 mm²/s, p≥180 bar)
|
3000
|
|
25.30
|
315
|
330
|
350
|
500 (at ν=12 mm²/s, p≥180 bar)
|
3000
|
|
32.70
|
300
|
320
|
350
|
500 (at ν=12 mm²/s, p≥180 bar)
|
2800
|
|
40.10
|
280
|
300
|
350
|
500 (at ν=12 mm²/s, p≥180 bar)
|
2600
|
|
50.70
|
260
|
280
|
350
|
500 (at ν=12 mm²/s, p≥180 bar)
|
2400
|
5. Model Code Explanation (Simplified)
The model code of PGH4-3X series follows a unified rule, taking PGH4-3X/020RE11VU2 as an example:
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PGH: Gap-compensated fixed-displacement internal gear pump
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4: Frame size (BG4)
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3X: Component series (30-39, with unchanged installation and connection dimensions)
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020: Displacement code, corresponding to 20.10 cm³/rev
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RE: Rotation direction (R=Clockwise) and shaft design (E=cylindrical or R=SAE involute spline)
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11: Line connection, SAE flange high-pressure series
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V: Sealing material, FKM seal[2]
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U2: Mounting flange, ISO 4-hole mounting flange conforming to ISO 3019-2 and VDMA 24560
6. Additional Notes
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Suction Port Pressure: 0.8 … 3 bar (absolute); avoid negative pressure to prevent cavitation.
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Sealing Options: Besides FKM (code V), NBR shaft seal rings (code W) are available for special requirements, with other seals still made of FKM.
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Volumetric Efficiency: Maintains over 92% under continuous working conditions, with internal leakage 60% lower than the industry average.
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Customization: Special configurations such as integrated pressure relief valves, extended suction ports, and custom flange adapters are available upon request.
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Fluid Compatibility: Suitable for HFC oil (with “W” seal design) and other common hydraulic oils.
