T7DBS-B31-B12 Parker Denison T7 Vane Pump 99+41cc 250bar

Product Overview

The T7BBS / T7DDB / T7DBS / T7ES series are Parker Denison T7 fixed-displacement vane pumps (single, double or multi-section) designed for industrial high-pressure hydraulic systems. These units are precision direct interchanges for original Denison T7 models including T7ES-057-1R00-A1M0, T7DDB-B20-B20-B04-5R00-A1M0 and T7DBS B31 B12 4R00 A1M1. Featuring advanced cartridge construction and hydraulically balanced vanes, they deliver high volumetric efficiency and low noise. Every pump undergoes 100% simulated duty-cycle testing to guarantee exact match of mounting flanges, shaft ends, port locations and performance curves.

Technical Specifications 

• Models: T7ES-057-1R00-A1M0 / T7DDB-B20-B20-B04-5R00-A1M0 / T7DBS B31 B12 4R00 A1M1 (and T7BBS / T7DDB / T7DBS range)
• Geometric displacement: B31 = 99.2 cm³/r; B12 = 41.0 cm³/r; B20 = 66.0 cm³/r; B10 = 31.8 cm³/r; T7ES-057 ≈ 183 cm³/r
• Continuous rated pressure: 250 bar (up to 280–300 bar for certain sizes and fluids)
• Peak pressure: up to 300–320 bar intermittent
• Maximum speed: 1800–3000 r/min depending on displacement and model
• Minimum recommended speed: approx. 600 r/min
• Control type: Fixed displacement (no variable control); single/double/multi-section options; keyed or splined shaft; configurable port positions
• Approximate weight: 23–40 kg depending on configuration
• Ports: SAE flange
• Seals: Buna-N / Viton / EPDM optional
• Mounting flange: SAE B / SAE C or ISO

Key Technical Advantages

1. Cartridge design: Allows rapid cartridge replacement without removing the pump body, minimizing downtime.
2. Hydraulically balanced vanes and floating side plates: Reduce wear and automatically compensate clearance for high volumetric efficiency and low internal leakage.
3. Precision machining for true interchangeability: Matches original Denison mounting dimensions, shaft ends and port orientations exactly—direct drop-in replacement.
4. Low noise and high reliability: Optimized flow paths minimize ripple; quality bearings and seals support continuous high-pressure duty.
5. 100% simulated operating-condition testing: Full pressure, flow, leakage and noise verification ensures consistency with OEM performance curves.

Application Areas

Injection molding machines, die-casting machines, machine-tool hydraulic systems, presses, steel and metallurgical equipment, port machinery, industrial power units and medium-to-high-pressure fixed hydraulic systems.

Expert Maintenance Tips

Ensure precise shaft alignment during installation to avoid excessive radial or axial loads. Maintain inlet pressure between 0 and 0.5 bar to prevent cavitation. Use anti-wear hydraulic oil (ISO VG 32–68 recommended); target system cleanliness of ISO 18/16/13 or better. Fully bleed air before initial start-up and monitor temperature and leakage during break-in. Cartridge kits can be replaced without removing the pump body. Periodically inspect shaft seals and bearings; never allow dry running.