BIA type mechanical seal

The BIA type mechanical seal is a high-performance, internally mounted, single-end-face mechanical seal designed for general rotating equipment such as pumps and agitators, and widely applicable to industrial fluid transportation and processing scenarios. The product adopts an internal flow, single-spring, unbalanced structure, achieving stable sealing through a rubber bellows drive. It supports single-end-face and double-end-face combination installation, flexibly adapting to various fluid conditions, providing reliable leak protection for rotating equipment, and is a core sealing component ensuring the stable operation of industrial fluid systems.

Performance parameters

Design Features

• Internal + Internal Flow Structure: The internal mounting adapts to the conventional shaft seal cavity of most general-purpose pumps, requiring no special modifications; the internal flow design reduces the risk of solid particles in the medium entering the sealing end face, lowering the probability of wear and blockage, and extending seal life.
• Single End Face + Single Spring Design: Compact structure, convenient installation and maintenance; the single spring provides stable and uniform end face specific pressure, adapting to axial movement of the equipment and ensuring the stability of the end face fit.
• Unbalanced Structure: Simplified structure, cost-effective, provides stable sealing performance under low and medium pressure conditions, reduces installation and commissioning difficulty, and is suitable for most general industrial scenarios.
• Rubber Bellows Driven Transmission: The rotating ring is driven to rotate coaxially by the fastening ring, ensuring stable and reliable transmission; the bellows also acts as an elastic compensation element, effectively absorbing equipment vibration and axial displacement, reducing end face wear.
• Combinable Double-End Face Structure: Two sets of seals can be installed back-to-back to form a double-end face sealing structure, suitable for high-risk, high-cleanliness, or easily vaporized media conditions, further improving sealing reliability and safety.

Main Material Composition

• Dynamic Ring / Static Ring (Sealing End Face): Graphite, silicon carbide (SiC), tungsten carbide (WC), which can be paired and combined according to the characteristics of the media, taking into account low friction, high wear resistance, and corrosion resistance, adapting to the wear and corrosion requirements of different media.
• Springs and Structural Components: Made of stainless steel, possessing excellent corrosion resistance and structural strength, providing stable end-face compensation force over a long period, suitable for conventional industrial environments.
• Bellows: Available in various materials such as nitrile rubber (NBR), ethylene propylene diene monomer (EPDM), fluororubber (FKM/Viton), and silicone, selectable according to media characteristics, suitable for different working conditions such as oil resistance, temperature resistance, and acid/alkali resistance.

Applicable Media and Typical Scenarios

• Oil-based Media: Lubricating oil, hydraulic oil, engine oil, diesel, kerosene, vegetable oil, and other general-purpose oils, resistant to oil media of different viscosity grades, ensuring sealing stability.
• Water-based Media: Tap water, circulating cooling water, hot water, cold water, industrial purified water, groundwater, sewage containing small amounts of impurities, etc., suitable for water supply and drainage, HVAC circulation, sewage treatment, etc.
• General Corrosive Media: Low-concentration acid and alkali solutions, salt solutions, process coolants, general chemical solutions, etc., resistant to long-term erosion by weakly corrosive media, reducing the risk of seal failure.
• Other Media: Food-grade media, pharmaceutical-grade media, HVAC circulating media, etc., can be selected using food-grade materials to suit operating conditions with high cleanliness requirements.

Core Product Advantages

• Strong Versatility and Adaptability: Adaptable to various shaft diameters from 14 to 60 mm, supports flexible combinations of single/double end faces, compatible with most general-purpose pumps and mixing equipment, meeting the needs of most industrial scenarios without complex customization.
• Stable and Reliable Structure: The internal flow structure reduces particle intrusion, and the bellows drive transmission is stable, effectively absorbing equipment vibration and axial displacement, reducing end face wear and jamming risks, and extending seal service life.
• Multiple Material Options for Diverse Operating Conditions: The sealing end face and bellows support multiple material combinations, allowing for customized solutions based on media characteristics, taking into account oil resistance, temperature resistance, corrosion resistance, and wear resistance requirements, adapting to various complex media operating conditions.
• Convenient installation and maintenance: The single-end face structure design simplifies installation and replacement without complex tooling, significantly reducing maintenance costs and downtime; the double-end face combination installation offers flexibility, and the sealing level can be upgraded according to operating conditions.
• Cost-effective and high performance-to-price ratio: The unbalanced structure design simplifies operation, providing stable and reliable sealing performance under medium and low pressure conditions while controlling procurement and maintenance costs, meeting the cost-effectiveness requirements of most general industrial scenarios.