Ronzio Group 2 Aluminium Gear Pump
The Ronzio Z2 (Group 2) is the most comprehensively specified series in the aluminium gear pump range. Covering 9 sizes from 4.4 to 31.4 cm³/rev, it publishes three pressure ratings (continuous, intermittent, and peak), supports optional integral relief valves, and offers outboard bearing configurations for high radial-load applications. Suited to mobile plant, agricultural machinery, and industrial hydraulic power units, it is available as a pump or motor in single, tandem, multiple, or compact tandem configurations.
Key Specifications
- Displacement: 4.4–31.4 cm³/rev (9 sizes: types 04–31)
- Max continuous working pressure (P1): 300 bar (types 04–14) down to 160 bar (type 31)
- Intermittent pressure (P2): 340 bar (type 04) down to 170 bar (type 31)
- Max peak pressure (P3): 360 bar (types 04–14) down to 200 bar (type 31)
- Volumetric efficiency: 95–97% average
- Max shaft speed, no load: 5,500 rpm (types 04–06) down to 2,700 rpm (type 31)
- Max shaft speed at P1 pressure: 4,500 rpm (types 04–06) down to 2,200 rpm (type 31)
- Min shaft speed at P1 pressure: 1,000 rpm (type 04) down to 200 rpm (type 31)
- Operating temperature: –10°C to 80°C
- Oil viscosity: 20–120 mm²/s (cSt); max starting viscosity 700 mm²/s (cSt)
- Compatible fluid: Mineral hydraulic oil (DIN 51524)
- Clockwise, anti-clockwise, and bi-directional rotation options
- Single, tandem, multiple, and compact tandem pump/motor configurations
- Cross-series tandem assemblies available (Z2/Z1 and Z2/Z3)
Optional Features
- Integral relief valve: adjustable calibration (VR) or fixed calibration (VF); settings 50–330 bar
- Outboard bearing support: three types available (Type 1 max 100 Nm; Type 2 max 110 Nm; Type 3 max 175 Nm)
- Compact multiple pump option with common or separated inlet ports
- High-low pump (sequence valve) configuration available
Configuration Options
- Flanges: European (A0), German (B1, D3/D2, M3/M2, E2, G3, L3), American (C4/C7, F5, H6), European with drain (N4)
- Shafts: tapered 1:5 and 1:8; straight cylindrical (Ø13–22 mm); tongue/key (Ø18×8); SAE 16/32 splined (9, 11, and 13-tooth); Ø19×45 mm — refer to Z2 catalogue for full flange/shaft matrix
- Ports: European, German, BSPP, O-Ring Boss, front/rear ports
- Shaft seals: standard and reinforced (5 bar) NBR or Viton; 25 bar Variseal NBR or Viton; double-seal NBR or Viton options
Note: For bi-directional pumps and motors, maximum pressure is reduced by 15%.
