Rexroth PGH-2X Series Internal Gear Pumps
Rexroth Gear Pump：AZPB/ AZPF/ AZPN/ AZPG/ AZPS/ AZPT/ AZPU/ AZPJ/ 1PF2G/ PGF/ PGH/ PGM…
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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, driven by a hydraulically balanced pinion shaft meshing with an internal gear
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Working Principle
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The gear gaps open in the suction zone to draw in hydraulic oil. With gear rotation, the oil is delivered to the pressure zone, and a crescent separator isolates the suction and pressure oil zones.
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Core Advantages
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✓ Low Noise: Optimized gear profile and clearance design for extremely low operating noise ✓ Low Pulsation: Internal meshing structure delivers stable flow output and reduces system vibration ✓ High Efficiency: Patented floating clearance compensation technology maintains excellent efficiency even at low speed and low viscosity ✓ High Reliability: Cast iron housing with unlimited load cycle tolerance, capable of withstanding 1 million maximum pressure cycles ✓ High Flexibility: Can be combined with other Rexroth pumps (vane pumps, axial piston pumps) for modular power units
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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 2 (Displacement: 5.2-8.0 cm³/rev) & Size 3 (Displacement: 11.0-16.0 cm³/rev)
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Displacement Range
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5.2, 6.0, 8.0, 11.0, 13.0, 16.0 cm³/rev
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Max Working Pressure
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350 bar (Peak), 315 bar (Rated)
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Max Speed
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3000-4000 rpm (depending on pump size and oil viscosity)
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Temperature Range
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-20°C to +80°C (extended range available for special versions)
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Fluid Compatibility
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Mineral oils including HLP, HLPD, HVLP, HVLPD; biodegradable hydraulic oils compatible with selected models
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Seal Options
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NBR (Nitrile Butadiene Rubber) and FKM (Fluoroelastomer) seals for diverse medium requirements
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Mounting Type
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2-bolt SAE standard mounting flange; SAE standard suction and pressure ports
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Rotation Direction
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Standard clockwise (counter-clockwise optional)
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III. Structural Features
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Automatic Clearance Compensation: Equipped with dynamic clearance compensation devices that automatically adjust sealing gaps according to working pressure. It ensures optimal sealing performance under all operating conditions, especially at low speed and low viscosity, greatly improving volumetric efficiency and overall mechanical efficiency.
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Hydraulic Balanced Design: The pinion shaft adopts hydraulic balance structure, which reduces bearing load, minimizes friction loss and significantly extends service life.
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Heavy-duty Housing: High-strength cast iron housing provides excellent rigidity and impact resistance, adapting to long-term high-pressure operating environments.
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Modular Construction: Standardized mounting dimensions and interface specifications enable convenient system integration, replacement and daily maintenance.
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Low-noise Optimization: Optimized gear tooth profile and internal flow channel design effectively suppress mechanical vibration and fluid flow noise, achieving ultra-quiet operation.
IV. Application Fields
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Plastic Processing Machinery: Hydraulic systems for injection molding machines, extruders and blow molding machines
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Machine Tool Equipment: Hydraulic power units for machining centers, lathes and milling machines
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Press Machines: High-pressure applications such as hydraulic presses, stamping presses and bending machines
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Testing Equipment: Precision control systems for material testing machines and fatigue test benches
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Other Industrial Applications: Automated production lines, hydraulic stations and accumulator charging systems
V. Model Nomenclature
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Code
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Definition
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PGH
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Product series code (Internal Gear Pump)
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2
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Frame size code
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2X
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Component generation code
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006
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Nominal displacement (6 cm³/rev)
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L
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Flange mounting type
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E
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Shaft extension type
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07
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Seal material grade (NBR / FKM)
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V
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Rotation direction
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U2
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Special configuration features
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VI. Selection & Operation Precautions
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Displacement Selection: Calculate the required pump displacement based on system flow demand and operating speed (Displacement = Flow / Speed).
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Pressure Matching: Ensure continuous system working pressure does not exceed the rated pressure of 315 bar, and instantaneous peak pressure shall not exceed 350 bar.
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Fluid Requirements: Adopt hydraulic oil compliant with ISO 4406 cleanliness standards, with a recommended viscosity range of 10-100 mm²/s.
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Installation & Maintenance:
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Ensure high coaxiality between the pump shaft and drive shaft to avoid abnormal radial force.
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Design short and thick suction pipelines to prevent cavitation and air ingestion.
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Regularly inspect oil cleanliness and filter condition to avoid component wear.
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Perform periodic maintenance including seal and bearing replacement in accordance with the official manual.
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VII. Summary
Complete products, original authentic products, fast delivery!Welcome to consult.
Process steps：
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.
