QT62-100/QT62-125/QT31-20 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 (QT62-100, QT62-125, QT31-20) Parameter & Model Description
1. Model Code Interpretation
-
QT62: Series identifier, indicating a medium-high pressure and medium-large flow external gear fixed displacement pump of the QT62 series produced by Sumitomo, designed for medium-heavy duty industrial hydraulic system requirements, with a robust structure, high pressure resistance and high efficiency, suitable for harsh industrial scenarios.
-
QT31: Series identifier, indicating a low-to-medium pressure and small-flow external gear fixed displacement pump of the QT31 series produced by Sumitomo, designed for light-duty industrial hydraulic system requirements, with a compact and lightweight structure, low noise and easy installation, suitable for space-constrained and precision equipment scenarios.
-
100/125/20: Nominal displacement of the gear pump, corresponding to three specifications respectively: 100 cc/rev (QT62-100), 125 cc/rev (QT62-125) and 20 cc/rev (QT31-20), which can meet different flow demands of hydraulic systems.
2. Core Technical Parameters
|
Parameter Item
|
Specification (QT62-100 / QT62-125 / QT31-20)
|
Unit
|
|
Pump Type
|
External Gear Fixed Displacement Pump
|
–
|
|
Nominal Displacement
|
100 / 125 / 20
|
cc/rev
|
|
Maximum Operating Pressure
|
25.0 (250) / 25.0 (250) / 20.0 (200)
|
MPa (bar)
|
|
Maximum Rotational Speed
|
2500 / 2500 / 2800
|
rpm
|
|
Minimum Rotational Speed
|
500 / 500 / 500
|
rpm
|
|
Operating Temperature Range
|
-10 – 80 (Unified for three models)
|
℃
|
|
Shaft Seal Type
|
High-temperature Resistant Oil Seal, leak-proof and wear-resistant
|
–
|
|
Mounting Type
|
Flange Mounting (ISO Standard, unified for three models)
|
–
|
|
Flange Bolt Specification
|
M14 (8.8) 4pcs (QT62); M10 (8.8) 4pcs (QT31); Tightening Torque: 95-115 / 95-115 / 30-40 N·m
|
–
|
3. Performance Characteristics
-
QT62 series (QT62-100, QT62-125) adopts a robust external gear structure, with medium-high pressure resistance and medium-large flow output, strong pollution resistance and low requirements on hydraulic oil cleanliness, which can adapt to harsh medium-heavy duty industrial working environments and long-term continuous operation.
-
QT31 series (QT31-20) features a compact and lightweight external gear structure, with low-to-medium pressure resistance and small-flow output, low noise, smooth operation and easy installation, suitable for space-constrained scenarios and precision equipment that requires stable small-flow hydraulic power.
-
All three models feature high efficiency (efficiency range 75% – 90%), 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.
-
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
-
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 QT62 and QT31 series to avoid overload operation and installation errors.
-
When installing, use the specified number, strength class and tightening torque of bolts according to the model (QT62 and QT31 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.
-
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-005); 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.
