QT42-25/QT42-31.5/QT52-40 Gear Pumps
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 (QT42-25, QT42-31.5, QT52-40) Parameter & Model Description
1. Model Code Interpretation
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QT42: Series identifier, indicating a low-to-medium pressure and small-to-medium flow external gear fixed displacement pump of the QT42 series produced by Sumitomo, designed for light-to-medium duty industrial hydraulic system requirements, with a compact and lightweight structure, low noise and easy installation, suitable for space-constrained scenarios.
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QT52: Series identifier, indicating a medium-pressure and medium-flow external gear fixed displacement pump of the QT52 series produced by Sumitomo, designed for general industrial hydraulic system requirements, with a robust structure, stable operation and strong adaptability, suitable for medium-duty industrial scenarios.
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25/31.5/40: Nominal displacement of the gear pump, corresponding to three specifications respectively: 25 cc/rev (QT42-25), 31.5 cc/rev (QT42-31.5) and 40 cc/rev (QT52-40), which can meet different flow demands of hydraulic systems.
2. Core Technical Parameters
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Parameter Item
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Specification (QT42-25 / QT42-31.5 / QT52-40)
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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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25 / 31.5 / 40
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cc/rev
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Maximum Operating Pressure
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20.0 (200) / 20.0 (200) / 20.0 (200)
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MPa (bar)
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Maximum Rotational Speed
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2800 / 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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M12 (8.8) 4pcs (Unified for QT42 and QT52); Tightening Torque: 45-60 / 45-60 / 45-60 N·m
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–
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3. Performance Characteristics
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QT42 series (QT42-25, QT42-31.5) adopts a compact and lightweight external gear structure, with low-to-medium pressure resistance and small-to-medium flow output, low noise, strong pollution resistance and low requirements on hydraulic oil cleanliness, which can adapt to light-to-medium duty industrial working environments and space-constrained scenarios.
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QT52 series (QT52-40) features a more robust structure than QT42 series, with medium pressure resistance and medium flow output, high efficiency and stable operation, suitable for general medium-duty industrial scenarios that require higher flow than QT42 series.
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All three models feature high efficiency (efficiency range 75% – 90%), stable output flow and strong overload capacity, suitable for long-term continuous operation; 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.
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.
