FBD type mechanical seal

The FBD mechanical seal is a high-performance, single-end-face, unbalanced rotary seal designed specifically for rotating equipment such as pumps and agitators. Its precise end-face sealing structure achieves zero-leakage protection, while also possessing excellent floating compensation performance and anti-jamming capabilities. It is widely adaptable to oil, water, and general corrosive media conditions, serving as a core sealing guarantee for the stable operation of industrial fluid equipment.

Performance parameters

Design Features

• Internal suction and internal flow structure: Effectively reduces the risk of solid particles in the medium entering the sealing end face, improves anti-pollution capability, and extends seal life, especially suitable for wastewater and sewage media containing trace particles.
• Single-sided, single-spring, unbalanced design: Compact structure, convenient installation and maintenance; the single spring provides stable end face pressure, can adapt to axial movement, and supports installation and operation in any direction.
• Optimized stress on rubber bellows: The bellows does not bear tensile stress, significantly reducing the risk of fatigue damage, improving anti-aging performance, and extending seal service life.
• Multifunctional integrated design: The rubber bellows directly drives the rotating ring, serving as both the main sealing element and the rotational driving force transmission mechanism, simplifying the structure while ensuring operational stability.
• Specially adapted for wastewater scenarios: Optimized for sewage treatment conditions, it can withstand the erosion of impurities and weak acid/alkali media in sewage, reducing the risk of seal failure.

Main Material Composition

• Sealing Surface: Graphite, silicon carbide (SiC), tungsten carbide (WC), hard alloy, etc., with different combinations to suit different media and working conditions, featuring low friction, high wear resistance, and corrosion resistance.
• Bellows: Nitrile rubber (NBR), fluororubber (Viton), ethylene propylene diene monomer (EPDM), selectable according to media characteristics, suitable for water, oil, weak acid/weak alkali, and other media environments.
• Metal Components: Stainless steel, possessing good corrosion resistance and structural strength, capable of long-term stable use under normal working conditions.

Applicable Media and Scenarios

• Water-based Media: Cold water/hot water, circulating water, tap water, wastewater containing trace particles, municipal/domestic sewage, groundwater, etc.
• Food and Beverage Media: Water, fruit juice, tea, beer, dairy products, syrup, food-grade low-concentration acidic/alkaline cleaning solutions, etc.
• Acid and Alkali Media: Low-concentration sulfuric acid, other weak/dilute acids; low-concentration carbon dioxide solution, sodium carbonate solution, and other weak/dilute alkali solutions.
• Suspension Media: Process suspensions containing trace solid particles, low-concentration suspensions, sludge suspensions, and other low-concentration suspension mixtures.
• Other General Media: Diluents, vegetable oils, brine, diluted chemical solvents, HVAC circulating fluids, etc.

Core Advantages of the Product

• Reliable Structure and Convenient Maintenance: Single spring + bellows drive design, simplified structure, no complex tooling required for installation and replacement, significantly reducing maintenance costs and downtime.
• Anti-fouling and Wear-resistant, Adaptable to Complex Media: Internal flow structure reduces particle intrusion, combined with highly wear-resistant sealing surface materials, can withstand sewage and suspension media containing trace impurities, reducing end-face wear and leakage risks.
• Optional Materials, Adaptable to Multiple Working Conditions: Multiple sealing surface materials and bellows are available, and customized adaptation solutions can be made according to the characteristics of the media, taking into account the requirements of temperature resistance, corrosion resistance, and wear resistance.
• Stable operation and excellent sealing performance: The bellows is not subjected to tensile stress and has strong fatigue resistance; the end face specific pressure is stable, which can adapt to the axial movement of conventional pump equipment and ensure long-term leak-free operation.
• Cost-friendly and highly versatile: It is compatible with various shaft diameters from 10 to 110 mm and most general-purpose pump types. It can meet the sealing needs of most industrial scenarios without complex customization, and has an outstanding cost performance.