T7DD/T7DDS series Double vane pump
T6 series vane pump models: T6C, T6D, T6E,T6CC, T6DC, T6EC,T67DBB, T67DCB, T6DCC, T67DDBS, T6DDCS, T67EDB(S), T6EDC(S), etc.
T7 series vane pump models: T7B, T7BS, T7D, T7E,T7DB, T7DC, T7DBB, T7DCB, T7DCC, T7DDB, T7EDB, etc.
T6 series vane pump models: T6C-003 to T6C-031, T6D-014 to T6D-050, T6E-042 to T6E-085, etc.
T7 series vane pump models: T7B, T7BS, T7D, T7E, etc.
T6 series double pump model: T6CC, T6DC, T6EC, etc.
T7 series double pump model: T7DB, T7DC, etc.
T6 series triple pump models: T67DBB, T67DCB, T6DCC, T67DDBS, T6DDCS, T67EDB(S), T6EDC(S), etc.
T7 series triple pump models: T7DBB, T7DCB, T7DCC, T7DDB, T7EDB, etc.
Parker T7DD/T7DDS double pump specifications and technical analysis：
1. Model structure and technical parameters
Typical model example
T7DDS-E38-E31-1R01：
E38-E31: Double pump displacement combination (38 cc/rev + 31 cc/rev).
1R01: Flange installation configuration (standard direction), the shaft end is a flat key or a 1:10 taper keyway.
Sealing code: Such as A1M0, it means NBR seal (resistant to mineral oil-based hydraulic oil).
T7DDS-E42-E28-1R00-A1M0-NOP：
E42-E28: Displacement combination (42 cc/rev + 28 cc/rev).
NOP: It may be a special customization option (such as servo control).
Core performance parameters
Item value remarks
The maximum working pressure is 300 bar (double pump configuration), the peak pressure of a single pump can reach 320 bar
Speed range 600~3600 rpm (industrial use) automotive models support a wider range
Displacement range 5.8~268.7 cm3/rev is divided into B/E series, covering small flow to large flow
Volumetric efficiency ≥92% (at 1800 rpm), typical mechanical efficiency is 0.94
2. Technical differences and application scenarios
The difference between T7DD and T7DDS
T7DD: Basic double pump model, suitable for conventional high-pressure hydraulic systems.
T7DDS: Optimized version, which may enhance sealing performance or adapt to servo control (for example, the suffix “S” represents a special design).
Application area
Machine tool industry: multi-loop hydraulic drive for injection molding machines and die-casting machines.
Industrial equipment: presses, bending machines, shearing machines, etc.
Shipbuilding and metallurgy: deck machinery, rolling auxiliary equipment.
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.
