Product Overview
The Flender B4FV10 represents the pinnacle of high-reduction transmission technology. While most industrial gearboxes stop at 2 or 3 stages, the "B4" series adds a fourth helical reduction stage to achieve ratios up to 400:1. This allows a standard 11kW motor to drive massive industrial impellers or slow-moving scrapers with immense mechanical advantage. The "V" designation indicates its vertical optimization, featuring a housing and internal lubrication circuit specifically designed to operate indefinitely in a vertical position without the risk of oil starvation or leakage at the bottom seal.
Technical Parameter Table
| Parameter | Technical Detail |
| Rated Power (P1) | 11 kW |
| Nominal Torque (T2n) | 19,000 Nm |
| Gear Stages | 4 (1 Bevel set + 3 Helical sets) |
| Output Shaft Diameter | 100mm / 110mm |
| Housing Construction | High-density Grey Cast Iron (GG25) |
| Efficiency | ~92% (Optimized for 4-stage reduction) |
| Lubrication | Dip lubrication with integrated "Drywell" protection |
Unique Features of the B4FV10
Quad-Stage Torque Density: By distributing the 11kW load across four distinct reduction stages, the B4FV10 achieves a torque-to-weight ratio that is significantly higher than using a 3-stage box with an external primary reducer.
Vertical "Leak-Proof" Drywell: The Size 10 vertical housing includes a proprietary internal "Drywell" structure. This provides an air-gap barrier between the oil reservoir and the lower output bearing, ensuring that even under seal wear, lubricant cannot contaminate the product below.
Low-Velocity Oil Circulation: Specifically designed for the slow output speeds of the B4 series, the internal baffles are positioned to ensure that the bevel gear (the high-speed stage) remains fully submerged while the final helical stages are lubricated by a specialized internal gutter system.
Installation & Modular Solutions
Specialized Vertical Drive Packages
The B4FV10 is typically integrated into the following systems to ensure 24/7 reliability:
Reinforced Aerator Flanges: We provide oversized output flanges that allow the B4FV10 to support the significant bending moments and axial thrust generated by large-diameter surface aerator blades.
Motor Scoops for Vertical Alignment: A specialized vertical motor scoop allows the 11kW motor to be mounted directly above the gearbox, creating a compact "tower" configuration that minimizes the footprint on top of tanks or vessels.
Vibration Monitoring Arrays: Given the slow output speed and high torque, we offer low-frequency vibration sensors that specifically monitor the mesh health of the 4th reduction stage.
Related Model Reference Table
| Model Series | Configuration | Typical Ratio | Output Type |
| B4FV10 | 4-Stage / Vertical | 100 - 400 | Solid Shaft |
| B4DV10 | 4-Stage / Vertical | 100 - 400 | Hollow Shaft |
| B3FV10 | 3-Stage / Vertical | 25 - 112 | Solid Shaft |
| B4FV08 | 4-Stage / Vertical | 100 - 400 | Solid Shaft (Smaller) |
| B4SV10 | 4-Stage / Vertical | 100 - 400 | Heavy Duty Thrust |
Industry Applications
Water Treatment: Driving large-scale vertical surface aerators and sludge thickeners.
Chemical Industry: Slow-speed agitators for high-viscosity polymer blending.
Mining: Drive units for flocculant mixers and leaching tank scrapers.
Food Processing: Large-scale industrial fermentation and mashing tank drives.
FAQ
Q1: Why use a 4-stage gearbox instead of a VFD to slow down the motor?
A1: A VFD can reduce speed but it cannot increase torque beyond the motor's rating. The B4FV10's 4-stage design multiplies the torque of the 11kW motor by up to 400 times, which is necessary for moving heavy loads at very slow speeds.
Q2: What is the benefit of the "Drywell" feature?
A2: In vertical mixers, oil leaks can ruin entire batches of product. The Drywell is a physical internal dam that prevents oil from ever reaching the output shaft exit, even if the primary seal fails.
Q3: Can the B4FV10 handle upward axial thrust?
A3: Yes. The B4FV10 can be equipped with reinforced tapered roller bearings designed to handle both downward weight and upward reaction forces from impellers.
Q4: How often should I change the oil in a 4-stage unit?
A4: Because the 4th stage moves so slowly, oil degradation is generally slower. However, we recommend a first change after 2,500 hours and subsequent changes every 10,000 hours for mineral oil.
Q5: Is it possible to get a hollow shaft version?
A5: Yes, the B4DV10 is the hollow shaft equivalent, which is ideal for mounting directly onto the mixer shaft to save vertical space.
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