QT33-16/QT43-20/QT43-25 Gear pump
QT31,QT32,QT33 series Gear pump; QT41,QT42,QT43 series Gear pump;
QT51,QT52,QT53 series Gear pump;QT61,QT62,QT63 series Gear pump;
Sumitomo Gear Pump QT Series (QT33-16, QT43-20, QT43-25) Parameter & Model Description
1. Model Code Interpretation
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QT33: Series identifier, indicating a low-pressure and small-flow external gear fixed displacement pump of the QT33 series produced by Sumitomo, designed for light-duty and precision industrial hydraulic system requirements, with an ultra-compact and lightweight structure, ultra-low noise and easy installation, suitable for space-constrained and high-precision equipment scenarios.
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QT43: Series identifier, indicating a low-to-medium pressure and small-to-medium flow external gear fixed displacement pump of the QT43 series produced by Sumitomo, designed for general light-to-medium duty industrial hydraulic system requirements, with a stable structure, reliable operation and moderate flow output, suitable for common industrial scenarios with small-to-medium flow demands.
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16/20/25: Nominal displacement of the gear pump, corresponding to three specifications respectively: 16 cc/rev (QT33-16), 20 cc/rev (QT43-20) and 25 cc/rev (QT43-25), which can meet different small-to-medium flow demands of hydraulic systems.
2. Core Technical Parameters
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Parameter Item
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Specification (QT33-16 / QT43-20 / QT43-25)
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Unit
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Pump Type
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External Gear Fixed Displacement Pump
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–
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Nominal Displacement
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16 / 20 / 25
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cc/rev
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Maximum Operating Pressure
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16.0 (160) / 20.0 (200) / 20.0 (200)
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MPa (bar)
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Maximum Rotational Speed
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3000 / 2800 / 2800
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rpm
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Minimum Rotational Speed
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500 / 500 / 500
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rpm
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Operating Temperature Range
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-10 – 80 (Unified for three models)
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℃
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Shaft Seal Type
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High-temperature Resistant Oil Seal, leak-proof and wear-resistant
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–
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Mounting Type
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Flange Mounting (ISO Standard, unified for three models)
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–
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Flange Bolt Specification
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M10 (8.8) 4pcs (QT33); M12 (8.8) 4pcs (QT43); Tightening Torque: 30-40 / 45-60 / 45-60 N·m
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–
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3. Performance Characteristics
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QT33 series (QT33-16) adopts an ultra-compact external gear structure, with low pressure resistance and small-flow output, ultra-low noise, smooth operation and easy installation, suitable for space-constrained scenarios and high-precision equipment that requires stable small-flow hydraulic power, with strict requirements on hydraulic oil cleanliness.
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QT43 series (QT43-20, QT43-25) features a stable and reliable external gear structure, with low-to-medium pressure resistance and small-to-medium flow output, strong pollution resistance and low requirements on hydraulic oil cleanliness, which can adapt to general light-to-medium duty industrial working environments and long-term continuous operation.
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All three models feature high efficiency (efficiency range 78% – 92%), stable output flow and strong overload capacity; the installation and connection dimensions comply with ISO international standards, facilitating replacement with domestic and foreign similar gear pump products and strong interchangeability.
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The key components (gears, shaft, oil seal) are made of high-wear-resistant and high-temperature resistant materials, referring to advanced gear processing technology to ensure good sealing performance and long service life, effectively reducing the risk of hydraulic oil leakage and equipment failure.
4. Application Scope
5. Notes
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The pump should be used within the specified temperature and viscosity range, and the hydraulic oil should be regularly filtered to avoid performance degradation or component wear caused by excessive temperature, inappropriate oil viscosity or oil pollution; pay attention to the difference in maximum operating pressure and flange bolt specifications between QT33 and QT43 series to avoid overload operation and installation errors.
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When installing, use the specified number, strength class and tightening torque of bolts according to the model (QT33 and QT43 series have different bolt specifications) to prevent bolt damage, pump loosening and hydraulic oil leakage; check the coupling connection before startup to ensure correct installation. The tightening torque is determined according to the bolt specification and strength grade, complying with general mechanical bolt torque standards.
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For detailed dimensions, oil port specifications, maintenance methods and spare parts information of the three models, refer to Sumitomo official technical manual (Document No. QT-Series-006); regular maintenance is recommended to extend the service life, and the lubrication system should be checked regularly to ensure sufficient lubrication.
Sumitomo Gear pump : QT32-12.5 , QT32-16 , QT42-20 , QT42-25 , QT42-31.5
Sumitomo Gear pump : QT52-50 , QT52-63 , QT62-80 , QT62-100 , QT62-125 , QT31-20 , QT31-25
Sumitomo Gear pump : QT31-31.5 , QT41-40 , QT41-50 , QT41-63 , QT51-80 , QT51-100 , QT51-125
Sumitomo Gear pump : QT61-160 , QT61-200 , QT61-250 , QT33-12.5 , QT33-16 , QT43-20
Sumitomo Gear pump : QT43-25 , QT43-31.5 , QT53-40 , QT53-50 , QT53-63 , QT63-80
Sumitomo Gear pump : QT63-100 , QT63-125 , QT52-40
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.
