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Rexroth PGH-3X Series Internal Gear Pumps
Rexroth Gear Pump：AZPB/ AZPF/ AZPN/ AZPG/ AZPS/ AZPT/ AZPU/ AZPJ/ 1PF2G/ PGF/ PGH/ PGM…
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Description
REXROTH PGH-3X series is a high-pressure fixed-displacement internal gear pump upgraded and launched by Bosch Rexroth, optimized for variable-speed drive industrial hydraulic systems. Featuring ultra-low noise, low flow pulsation, high volumetric efficiency and strong compatibility, this series supports large displacement specifications and modular combination installation, widely used in heavy-duty high-pressure open-circuit hydraulic systems.
I. Basic Characteristics & Core Advantages
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Characteristics
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Description
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Pump Type
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Fixed-displacement internal gear pump with automatic clearance compensation, specially optimized for variable-speed drive conditions
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Working Principle
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The internal and external gears mesh to form variable-volume chambers. The crescent plate separates suction and pressure zones. With gear rotation, hydraulic oil is continuously sucked, pressurized and output, achieving stable constant flow delivery.
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Core Advantages
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✓ Large Displacement Coverage: Covers medium and large displacement ranges to meet high-flow industrial hydraulic demands ✓ Excellent Speed Adaptability: Optimized for variable-frequency and variable-speed drive systems with stable performance under variable speed conditions ✓ Low Vibration & Low Noise: Optimized gear profile and flow channel design, effectively reducing operating noise and system pulsation ✓ High Pressure Resistance: Long-term stable operation under 315 bar rated pressure, peak pressure up to 350 bar ✓ Strong Modularity: Freely combinable with Rexroth vane pumps, piston pumps and other series pumps for modular power units ✓ Diversified Medium Adaptation: Optional special seals for HFC hydraulic fluid and biodegradable oil media
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II. Technical Parameter Overview
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Parameter
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Specification Range
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Frame Size
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Size 4, Size 5 (medium and large frame specifications)
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Displacement Range
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20 ~ 250.5 cm³/rev (complete specifications: 20, 25, 32, 40, 50, 63, 80, 100, 125, 160, 200, 250 cm³/rev)
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Max Working Pressure
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350 bar (Peak), 315 bar (Continuous Rated)
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Max Speed
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2500~3500 rpm (varies with frame size, displacement and oil viscosity)
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Temperature Range
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-20°C to +80°C (custom extended temperature versions available)
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Fluid Compatibility
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Standard mineral oils (HLP, HLPD, HVLP, HVLPD); optional adaptation for HFC water-glycol hydraulic fluid and biodegradable hydraulic oils
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Seal Options
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NBR (standard), FKM (high-temperature & corrosion-resistant), special seals for HFC media
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Mounting Type
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2-bolt SAE standard mounting flange; SAE standard suction and pressure port specifications
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Rotation Direction
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Standard clockwise (CW); counter-clockwise (CCW) optional
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III. Structural Features
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Advanced Automatic Clearance Compensation System: Adopts floating side plate clearance compensation structure, which dynamically adjusts internal sealing gaps according to working pressure and speed. It maintains high volumetric efficiency even under long-term high-pressure and variable-speed operating conditions, effectively avoiding internal leakage and performance attenuation.
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Variable-Speed Drive Optimization Design: The gear meshing angle and flow channel structure are specially optimized for frequency conversion and variable-speed working conditions, ensuring stable flow output and low pulsation in full speed range, adapting to energy-saving variable-speed hydraulic systems.
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Heavy-Duty Cast Iron Housing: High-rigidity integral cast iron structure with excellent pressure resistance and impact resistance, capable of long-term stable operation in harsh industrial environments, with unlimited normal load cycle times and durable service life.
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High Versatility Modular Structure: Standardized installation dimensions, shaft extension specifications and oil port interfaces support multi-pump combined installation. It can be flexibly combined with other Rexroth hydraulic pumps to form integrated modular power units for diverse system layout requirements.
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Multi-Medium Adaptive Sealing Structure: Supports multiple sealing configurations, compatible with conventional mineral oil, water-glycol HFC media and environmental-friendly biodegradable hydraulic oil, meeting the application needs of special working conditions such as fire resistance and environmental protection.
IV. Application Fields
The PGH-3X series is mainly applicable to heavy-duty, high-flow, high-pressure and variable-speed energy-saving hydraulic systems, covering medium and large industrial equipment scenarios:
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Heavy Plastic Machinery: Large injection molding machines, hollow blow molding machines, profile extruders and other high-power plastic forming equipment
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Heavy-Duty Machine Tools: Large gantry machining centers, CNC heavy-duty lathes, precision grinding machines and automated machine tool hydraulic stations
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Hydraulic Press & Forming Equipment: Large hydraulic presses, stamping equipment, bending machines, die-casting machines and other high-pressure forming machinery
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New Energy & Environmental Protection Equipment: Variable-speed energy-saving hydraulic systems, environmental-friendly medium hydraulic equipment, and industrial fluid power test benches
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Other Heavy Industrial Fields: Metallurgical equipment, mining auxiliary machinery, automated production lines, large hydraulic power stations and accumulator charging systems
V. Model Nomenclature & Common Models
Standard Model Example: PGH4-3X/020RE11VU2 / PGH5-3X/100RE07VU2
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Code
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Definition
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PGH
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Rexroth Internal Gear Pump Series Code
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4 / 5
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Frame Size (4 = medium frame, 5 = large frame)
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3X
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Third-generation upgraded component series, variable-speed optimized version
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020 / 100
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Nominal displacement (unit: cm³/rev)
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R
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SAE standard flange mounting form
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E
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Standard shaft extension configuration
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07 / 11
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Seal material grade and medium adaptation code
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V
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Rotation direction code
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U2
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Standard configuration, no special modification
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Common Standard Models of PGH-3X Series: PGH4-3X/020RE11VU2, PGH4-3X/025RE11VU2, PGH4-3X/032RE11VU2, PGH4-3X/040RE11VU2, PGH5-3X/080RE07VU2, PGH5-3X/100RE07VU2, PGH5-3X/160RE07VU2, PGH5-3X/250RE07VU2
VI. Selection & Operation Precautions
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Displacement & Frame Selection: Select frame size 4 for medium flow demand and size 5 for large flow demand. Calculate the matched displacement according to system flow and rated speed, and reserve a reasonable flow margin for variable-speed working conditions.
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Pressure Matching Principle: The continuous working pressure of the system shall not exceed 315 bar rated pressure, and the instantaneous impact peak pressure shall not exceed 350 bar. Avoid long-term over-pressure operation to extend pump service life.
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Hydraulic Fluid & Cleanliness Requirements: Conform to ISO 4406 oil cleanliness standards. The recommended kinematic viscosity range is 10-100 mm²/s. Select matched seals for special media such as HFC water-glycol fluid to avoid seal failure.
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Installation & Daily Maintenance:
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Ensure high coaxiality between pump shaft and driving shaft to eliminate abnormal radial and axial loads.
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Optimize suction pipeline design with short and straight layout to prevent cavitation and air suction under variable-speed operation.
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Regularly detect oil cleanliness and replace filter elements to prevent gear and bearing wear caused by particle impurities.
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Carry out periodic inspection of seals and wearing parts, and implement standardized maintenance in accordance with Bosch Rexroth official operation manual.
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VII. Product Summary
The REXROTH PGH-3X series internal gear pump is an upgraded high-performance model for medium and large flow, high-pressure variable-speed hydraulic systems. Compared with the 2X series, it features larger displacement coverage, stronger variable-speed adaptability and wider medium compatibility. With stable pressure resistance, low noise and low pulsation performance, as well as mature modular combination capability, it has become the core power component for heavy-duty plastic machinery, large machine tools, hydraulic presses and other industrial equipment. For detailed dimensional drawings, performance curves and customized selection solutions, please refer to the official Bosch Rexroth technical datasheets or contact authorized distributors.
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Shipping & Delivery
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Customer inquiry: Customers will make inquiries before placing an order to understand product details and communication needs.
Quotation: According to customer needs, provide a formal quotation, including the name, model, quantity, delivery time, payment method, etc. of the goods.
Order confirmation: After the customer confirms the quotation, a formal purchase order will be placed.
Confirm the delivery time: communicate the delivery time with the production department, inform the factory of the order details, and arrange the production plan.
Sign an export contract: After the two parties confirm that it is correct, sign an export contract to establish a trade relationship.
Implement the letter of credit (if applicable): If the payment method of the letter of credit is used, the customer needs to be urged to issue the certificate and review the contents of the letter of credit.
Export stocking: According to the requirements of the contract and the letter of credit, arrange production, purchase raw materials and packaging, and prepare the goods.
Chartering and booking: Contact the freight forwarder to make a booking and arrange the transportation of goods.
Export inspection: Apply to the quality inspection department for export commodity inspection and provide relevant documents.
Apply for a write-off slip: apply for a write-off slip from the foreign exchange management department for subsequent foreign exchange write-off.
Export declaration: Declare exports to the customs and provide documents such as power of attorney for customs declaration, customs declaration form for export goods, commercial invoice, packing list, etc.
