Product Overview
The Flender B3KV15 is the powerhouse of the vertical transmission series. The "V" in its designation indicates its specialized vertical output orientation, while the "K" refers to the reinforced bearing and gear arrangement designed for heavy-duty service. With a 250kW capacity, this unit is engineered for the most punishing duty cycles, such as those found in mineral grinding and large-scale agitation. The housing is cast from high-grade spheroidal graphite iron to ensure maximum structural integrity, while the precision-ground gears provide mechanical efficiency exceeding 94%.
Technical Parameter Table
| Parameter | Specification Details |
| Rated Power (P1) | 250 kW |
| Nominal Torque (T2n) | 75,000 Nm |
| Output Shaft Diameter | 160mm / 180mm / 190mm |
| Gear Stages | 3 (1 Bevel set + 2 Helical sets) |
| Standard Bearing Life | L10h > 50,000 Hours |
| Cooling System | Integrated Fan or External Heat Exchanger |
| Weight | Approx. 3,450 kg (Varies by configuration) |
Unique Features of the B3KV15
Heavy-Duty Axial Thrust Housing: The B3KV15 is built with an oversized lower housing section specifically designed to accommodate large-diameter thrust bearings. This allows the unit to support the significant downward weight of heavy impellers or grinding rollers directly on the output shaft.
Oil-Free "Drywell" Output: To eliminate the risk of product contamination, the B3KV15 features a proprietary "drywell" seal. This mechanical internal barrier prevents oil from leaking down the vertical shaft, even in the event of a primary seal failure-essential for food and chemical processing.
Spheroidal Graphite Iron Casing (GGG): Unlike standard gray iron used in smaller units, the Size 15 housing utilizes high-tensile GGG material. This provides superior fatigue resistance against the high-frequency vibrations typically generated by 250kW motor inputs.
Installation & Combined Solutions
Vertical Drive System Integration
The B3KV15 is rarely used as a standalone unit. We provide complete Vertical Power Packages including:
Pressure Lubrication Units: For 250kW operation, we integrate a dedicated motor-driven pump system. This ensures that the top-tier bevel gears and upper bearings receive a constant flow of filtered, cooled oil regardless of shaft speed.
Reinforced Flange Mounts: We offer specialized support flanges that distribute the 75,000 Nm reaction torque evenly across the machine foundation, reducing structural stress on the tank or vessel.
Vibration Monitoring Arrays: Each B3KV15 can be factory-fitted with SPM (Shock Pulse Method) sensors to monitor bearing health in real-time, allowing for predictive maintenance in critical 24/7 operations.
Related Model Reference Table
| Model Series | Power Rating | Output Shaft Style | Orientation |
| B3KV15 | 250 kW | Solid Shaft | Vertical |
| B3DV15 | 250 kW | Hollow Shaft | Vertical |
| B3SH15 | 250 kW | Solid Shaft | Horizontal |
| B3KV14 | 200 kW | Solid Shaft | Vertical |
| B3KV16 | 315 kW | Solid Shaft | Extra Heavy Duty |
Industry Applications
Mining: Primary drives for vertical roller mills and flotation cells.
Chemical & Plastic: High-torque vertical agitators and polymer blenders.
Water Treatment: Large-scale surface aerators and sludge thickeners.
Steel Production: Cooling bed drives and vertical hoisting mechanisms.
FAQ
Q1: What makes the "K" series different from standard Flender units?
A1: The "K" series denotes a reinforced gear and bearing design. In the B3KV15, this means the internal components are specifically rated to handle the higher axial and radial loads found in vertical grinding and mixing compared to standard horizontal conveyors.
Q2: Is a separate oil cooler required for the 250kW B3KV15?
A2: For most 250kW applications, a dedicated oil-to-air or oil-to-water heat exchanger is recommended to ensure the lubricant stays within its optimal viscosity range, especially in ambient temperatures over 30°C.
Q3: Can this gearbox be used for upward vertical output?
A3: Yes, but the lubrication system must be modified to ensure the bottom bearings (now at the top) are not starved of oil. This requires a specific "Mounting Position 6" configuration.
Q4: How does the "Drywell" feature benefit maintenance?
A4: The Drywell creates a dead-space that traps any oil bypassing the main seals. This oil is drained through a separate port, providing a visual warning of seal wear without allowing a drop of oil to reach the driven machine or the product below.
Q5: What is the recommended service interval for a unit of this size?
A5: For a B3KV15 using synthetic lubricants, the first oil analysis should occur at 5,000 hours, with a full change typically required every 20,000 operating hours, depending on the load and environment.
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