Product Description
Product Overview
The T7DBS-B35-B15 is a high-performance double vane pump built on the Parker Denison T7 heavy-duty series platform, featuring a dual-cartridge configuration with a D-size front pump section and a B-size rear pump section, mounted via a SAE C two-bolt motor flange. Engineered for complex industrial hydraulic circuits requiring independent dual-circuit pressure output, the front pump (P1) delivers 113.4 ml/rev at up to 250 bar continuous working pressure, while the rear pump (P2) delivers 50 ml/rev at up to 300 bar continuous working pressure — enabling simultaneous multi-actuator control from a single drive shaft.
Manufactured in strict accordance with Parker Denison’s original engineering specifications, all critical pump cartridge components — including cam rings, rotors, vanes, and port plates — are produced to identical material standards and machining tolerances as the OEM originals, guaranteeing 100% drop-in interchangeability without modification to piping, brackets, or couplings. Every unit undergoes 100% simulated duty-cycle testing prior to shipment, including rated-pressure run-in, volumetric efficiency calibration, noise level verification, and seal integrity validation, ensuring all performance parameters fully comply with the original technical data sheet.
Technical Specifications
- Model: T7DBS-B35-B15-4R05-A1M5
- Product Series: Parker Denison T7DBS (Heavy-Duty High-Pressure Double Vane Pump)
- Configuration: Dual-circuit fixed-displacement vane pump (D-housing front + B-housing rear, common shaft drive)
- Mounting Flange: SAE C 2-bolt motor flange (per J744)
- Front Pump Cartridge (P1): T7D-B35
- P1 Displacement: 113.4 ml/rev
- P1 Rated Working Pressure: 250 bar (3,625 psi)
- P1 Peak/Intermittent Pressure: 280 bar (4,060 psi)
- Rear Pump Cartridge (P2): T7B-B15
- P2 Displacement: 50 ml/rev
- P2 Rated Working Pressure: 300 bar (4,350 psi)
- P2 Peak/Intermittent Pressure: 320 bar (4,640 psi)
- Total Combined Displacement: 163.4 ml/rev
- P1 Maximum Speed: 2,800 rpm
- P2 Maximum Speed: 3,600 rpm
- Minimum Stable Speed: 600 rpm
- Rotation: Clockwise (viewed from shaft end)
- Shaft Type: Keyed shaft (SAE CC)
- Seal Material: NBR (Buna-N), compatible with mineral-based hydraulic fluids
- Port Orientation: Location code 4
- Housing Material: High-strength gray cast iron (GG25/GG30 grade)
- Vane Type: 12-vane dual-lip design with hydraulic pressure pins
- Unit Weight: Approx. 38.6 kg (85.1 lbs)
Key Technical Advantages
Dual-Lip Vane with Hydraulic Balance Technology
The patented dual-lip vane architecture features a primary sealing lip and a secondary pressure lip, with hydraulic pressure routed to the vane base through internal pressure pins to dynamically modulate the contact force between the vane tip and the cam ring. This design fundamentally eliminates the excessive tip loading inherent in conventional spring-loaded vane pumps at high pressures, maintaining consistent sealing performance and volumetric efficiency even at continuous pressures exceeding 250 bar, while significantly reducing contact stress on the vane-cam interface to extend the service life of critical tribological pairs.
High Volumetric Efficiency Across Wide Speed Range
The T7D cartridge achieves a theoretical flow of 170.1 L/min at 1,500 rpm, with actual volumetric efficiency reaching 92%–95%. Precision-lapped port plates and cam ring surfaces minimize internal leakage to exceptionally low levels. Meanwhile, the T7B cartridge supports speeds up to 3,600 rpm, enabling the rear circuit to deliver ample auxiliary flow for rapid traverse and secondary functions. The overall speed envelope of 600–3,600 rpm ensures compatibility with both fixed-speed electric motors and variable-frequency servo drives.
12-Vane Low-Pulsation, Low-Noise Design
The 12-vane equally-spaced configuration increases flow pulsation frequency by 20%–50% compared to conventional 8–10 vane designs, while reducing pulsation amplitude to less than one-third of traditional configurations. The cam ring employs an optimized asymmetric transition curve, combined with silencing grooves machined into the port plate, effectively suppressing pressure spikes and cavitation noise. Overall noise levels under rated conditions are maintained within 65–72 dB(A), significantly outperforming equivalent gear pumps and piston pumps — meeting occupational health requirements in manufacturing environments.
Hydrostatic Balance Eliminates Radial Bearing Loads
The T7 series employs a symmetrical dual-intake, dual-discharge hydrostatic balance architecture. Two working chambers are symmetrically distributed on opposite sides of the rotor, causing radial hydraulic forces to self-cancel. Bearings are subjected solely to torque transmission loads rather than radial hydraulic loading, dramatically reducing actual bearing stress. Paired with precision tapered roller bearings, the L10 calculated bearing life exceeds 20,000 hours, fundamentally ensuring long-term reliability under continuous heavy-duty operation.
Modular Cartridge Design for Rapid Maintenance
Both front and rear pump sections utilize independent plug-in cartridge kits. During maintenance, individual cartridges can be swapped without removing the complete pump from the machine or disconnecting hydraulic piping. Precision dowel-pilot registration between cartridge and housing ensures repeatable assembly accuracy. This modular approach reduces typical overhaul time from 4–6 hours (conventional designs) to just 1–2 hours, substantially minimizing downtime losses and maintenance labor costs.
Application Areas
- Injection Molding Machines: Front pump drives clamping and injection cylinders (high pressure/high flow); rear pump drives ejection, core-pulling, and mold-adjustment auxiliary circuits — ideal for servo energy-saving retrofits
- Metal Die Casting Machines: Dual circuits independently drive shot cylinders and clamping cylinders, meeting the distinct flow/pressure demands of fast-shot and intensification phases
- Metallurgical Hydraulic Power Units: Continuous casting vibrators, rolling mill screw-down systems, and ladle turrets — engineered for sustained high-pressure operation in high-temperature, contaminated environments
- Hydraulic Presses & Press Brakes: Front pump supplies high-pressure rapid-approach and pressing power for the main cylinder; rear pump drives blankholder or auxiliary clamping circuits
- Machine Tool Hydraulic Systems: Spindle clamping, tool-changing mechanisms, slide drives, and coolant circuits — accommodating frequent start-stop and bidirectional operation
- Marine Deck Machinery: Cargo cranes, steering gears, and windlass hydraulic systems — meeting the continuous-duty reliability demands of marine environments
- Mobile Equipment: Excavator pilot control circuits, crane hoist/luffing mechanisms — designed to withstand vibration and shock loads typical of mobile hydraulics
Expert Maintenance Tips
Shaft Alignment Precision
As a common-shaft dual-pump configuration, the T7DBS requires motor-to-pump shaft alignment within 0.05 mm TIR (Total Indicator Reading) and angular misalignment not exceeding 0.5°. Use flexible couplings to accommodate minor deviations — rigid couplings or forced assembly are strictly prohibited. Misalignment is the leading cause of premature shaft seal leakage and abnormal bearing wear, particularly critical in variable-frequency drive systems where low-speed resonance zones must be considered.
Fluid Cleanliness & Viscosity Management
System fluid cleanliness should meet a minimum of ISO 4406 18/16/13. Install a 100μm suction strainer at the pump inlet and a 10μm return-line filter. Recommended fluid: ISO VG32–VG46 anti-wear hydraulic oil (HM grade). Cold-start fluid temperature must not be below 10°C; continuous operating temperature should be maintained between 40–60°C. Excessively high viscosity causes suction deficiency and cavitation damage; excessively low viscosity accelerates internal leakage and volumetric efficiency loss.
Priming & Air-Bleeding Procedure
Before initial startup or restart after extended shutdown, the pump housing must be primed through the drain port with clean hydraulic fluid to ensure the cartridge cavities are completely filled — dry-starting is strictly prohibited. Begin operation in an unloaded state for 3–5 minutes, then gradually ramp up system pressure while monitoring for pressure fluctuations, abnormal noise, and housing temperature. If sharp whining sounds occur, immediately shut down and inspect suction line integrity and reservoir level.
Cartridge Replacement & Service Intervals
Under normal operating conditions (fluid cleanliness maintained, temperature controlled), the recommended cartridge overhaul interval is 8,000–12,000 operating hours. Routine inspection should focus on: abnormal housing temperature rise (exceeding ambient +35°C warrants investigation), sudden noise changes, and increased case drain flow (exceeding 50 ml/min indicates cartridge wear). When replacing cartridges, simultaneously renew shaft seals and O-ring seals, and verify dowel-pin alignment to ensure full seat contact between cartridge and housing.
Company Profile
Frequently Asked Questions
1.What ls our Main Products?
1.Hydraulic pump
2.Hydraulic valve
3.Hydraulic motor
4.Hydraulic cylinder
5.Hydraulic parts
2. What about the MOQ?
3.What are your advantages?
- Adhere to quality first.
- Support customization, ODM & OEM service.
- 1-year warranty and complete after-sales support.
- Safe and fast shipping worldwide.
- 24-hour online service for your inquiries.
4.Are you a manufacturer? What’s your delivery time?
Yes, we are a manufacturer with our own factory.
Common models are in stock, and orders are usually shipped within 1–3 days.
5.Which payment methods are accepted?
We accept T/T, L/C, PayPal, VISA, Western Union, Apple Pay, Google Pay, Afterpay (Clearpay), Klarna, and Trade Assurance.
For full orders: 30% deposit, balance before shipment.
For small/sample orders: full payment in advance.
6.How will you deliver my goods?
We offer flexible shipping options: DHL, UPS, FedEx, TNT, EMS, as well as air or sea freight.
All deliveries ensure door-to-door fast and safe service.
7.How do you inspect and guarantee your products?
All products are tested before shipment to ensure perfect working condition.
We offer a 12-month warranty — if a product fails due to quality issues, we provide free spare parts or repair support.
8.What about after-sales service?
If you encounter any problem during use, please contact your sales manager or our support team at any time.
We will respond quickly and help solve the issue efficiently.
9.What are your main applications?
- Hydraulic systems
- Agricultural machinery
- Construction machinery
- Automobile industry
- Local distributors and maintenance centers
10.Can I get a discount for bulk orders?
Yes. We offer competitive wholesale prices and try our best to give benefits to long-term partners.
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