Jiaxing Burgmann Mechanical Seal Co., Ltd. Jiashan King Kong Branch

Rubber bellows mechanical seals are a crucial type of shaft sealing component widely used in modern industrial fluid handling equipment. Combining the flexible deformation characteristics of rubber bellows and the sealing principle of mechanical seals, they effectively prevent medium leakage between rotating shafts and equipment housings, and have become an indispensable sealing solution in numerous industrial sectors. Different from traditional spring-loaded mechanical seals, rubber bellows serve as both the elastic compensation element and the secondary sealing part in this structure. The integrated design simplifies the overall structure, reduces the number of assembly parts, and lowers the failure rate caused by loose fittings or component aging. The rubber material features excellent elasticity, good compression resilience and outstanding adaptability to axial and radial displacement of the shaft. When the equipment runs with vibration, shaft deflection or slight axial movement, the rubber bellows can deform flexibly to keep the sealing face tightly fitted, maintaining stable sealing performance for a long time. In terms of medium adaptability, rubber bellows mechanical seals show great versatility. By selecting different rubber formulations such as nitrile rubber, fluororubber and EPDM, they can work stably in various media including water, oil, weak acid, weak alkali and common industrial chemical solutions. Nitrile rubber is widely used for water and mineral oil media due to its cost advantage and good oil resistance; EPDM excels in water, steam and weak corrosive aqueous environments with superior weather resistance and high-temperature resistance; fluororubber is applied to harsh working conditions involving strong corrosive media, high temperature and special chemical fluids, delivering reliable anti-corrosion and anti-aging performance. This kind of mechanical seal is primarily applied to rotating equipment such as centrifugal pumps, circulating pumps, agitators and mixers. In the water supply and drainage industry, it is used for municipal water pumps, sewage treatment pumps and circulating water pumps, effectively stopping water leakage and ensuring the normal operation of water system equipment. In the petrochemical industry, it is matched with various process pumps for conveying oil products and low-corrosion chemical media, adapting to continuous long-term operation under medium pressure and conventional temperature. In food, pharmaceutical and light industry fields, food-grade rubber bellows mechanical seals meet sanitary requirements, free from pollution to materials, and are commonly used in beverage delivery pumps, pharmaceutical fluid transfer equipment and food processing machinery. In HVAC and refrigeration systems, they are applied to cold water circulating pumps and refrigeration pumps, with stable performance under cyclic temperature changes. In practical operation, rubber bellows mechanical seals also present obvious advantages in installation and maintenance. The compact structure makes the installation process simpler and faster, suitable for equipment with limited installation space. Compared with metal bellows seals, rubber bellows produce lower friction noise during operation and have better shock absorption effect, which helps improve the overall operating environment of equipment. Meanwhile, reasonable material selection and standardized installation can greatly extend their service life. Regular inspection of the working status of the sealing face and bellows, timely replacement of aging components can avoid unexpected shutdown losses caused by seal failure. With the continuous development of industrial technology, industrial equipment puts forward higher requirements for sealing performance, environmental adaptability and service life. Manufacturers keep optimizing rubber formulas and structural designs of bellows, further improving the high-temperature resistance, low-temperature toughness and medium resistance of products. As a cost-effective and highly practical sealing product, rubber bellows mechanical seals will continue to be widely promoted and applied in more industrial fields, providing solid guarantee for the safe, stable and efficient operation of various fluid conveying and rotating equipment   Jiaxing Burgmann Mechanical Seal Co., Ltd Email: doris@mechanicalseal.com.cn Mob: 86-15381220188 WhatsApp: 8615381220188 Website: www.industrial-mechanicalseals.com Add: A-5 Wanyangzhongchuangcheng, Ganyao Town, Jiashan county, Jiaxing, Zhejiang, China. 314107

Pre-installation Inspection  1. Check the dimensional tolerance of pump shaft, shaft sleeve and seal chamber; eliminate burrs, scratches and corrosion on mating surfaces. 2. Clean all seal components thoroughly with clean solvent, no sundries, dust or particle residue on sealing faces. 3. Verify model, specification and material of mechanical seal conform to design requirements. 4. Inspect static ring, rotating ring sealing faces for crack, chipping and damage. Mounting Requirements 1. Apply a thin layer of compatible lubricant on shaft surface before fitting the seal; avoid corrosive grease damaging elastomers. 2. Control the compression amount of spring precisely; excessive pre-compression leads to rapid wear of seal faces, insufficient compression causes leakage. 3. Keep coaxiality of shaft and seal cavity within specified tolerance to prevent eccentric abrasion during operation. 4. Install anti-rotation pin correctly to avoid static ring circumferential rotation. 5. Tighten gland bolts evenly in diagonal sequence to prevent gland deflection and seal face uneven stress. Post-installation & Commissioning 安装后试车注意 1. Turn pump rotor manually after assembly; the shaft shall rotate flexibly without jamming or abnormal friction resistance. 2. Complete auxiliary flushing/quench piping connection per API Plan standard before startup. 3. Fill medium into pump cavity to ensure sealing surfaces get liquid lubrication; prohibit dry running of mechanical seal. 4. Carry out no-load test run first, monitor sealing part for dripping or abnormal heating.   Jiaxing Burgmann Mechanical Seal Co., Ltd Email: doris@mechanicalseal.com.cn Mob: 86-15381220188 WhatsApp: 8615381220188 Website: www.industrial-mechanicalseals.com Add: A-5 Wanyangzhongchuangcheng, Ganyao Town, Jiashan county, Jiaxing, Zhejiang, China. 314107

1. General Safety & Pre-Installation Precautions • Strictly prohibit touching the lapped seal faces with bare hands or placing them directly on workbenches; use clean, lint-free cloths and non-particle solvents for cleaning. • Confirm the seal model (M481), size, and material compatibility with the process medium (e.g., EPDM rubber incompatible with mineral oils). • Ensure the installation environment is dust-free, dry, and temperature-controlled (15–35°C). • Wear nitrile gloves and safety glasses during assembly to avoid contamination and injury. 2. Shaft & Seal Chamber Preparation 2.1 Shaft/Sleeve Specifications • Shaft runout at the seal installation area: ≤0.1 mm (0.004 in). • Shaft bending: ≤0.05 mm (0.002 in). • Axial end play: ≤0.5 mm (0.020 in). • Shaft tolerance: h8; surface finish: Ra ≤1.6 μm. • Shaft/sleeve end: Chamfer 1×45° and polish to remove burrs. 2.2 Cleaning & Inspection • Clean the shaft, sleeve, seal chamber, and gland with a lint-free cloth and volatile solvent (e.g., isopropyl alcohol); remove all rust, scale, and debris. • Inspect for: ◦ Cracks, scratches, or corrosion on the shaft/sleeve. ◦ Distortion or damage to the seal chamber/gland. ◦ Proper alignment of the shaft and seal chamber (concentricity ≤0.05 mm). 3. M481 Seal Component Overview • Rotating Unit: Rotary face (carbon/silicon carbide), O-ring, spring, drive collar, set screws. • Stationary Unit: Stationary face (ceramic/silicon carbide), O-ring, gland, anti-rotation pin. • Hardware: Gland bolts, lock washers, setting clips (for transport protection). 4. Step-by-Step Assembly 4.1 Pre-Assembly of Stationary Unit 1. Insert the stationary face into the gland; align the anti-rotation pin with the gland slot to prevent rotation. 2. Lubricate the stationary face O-ring with compatible lubricant (water/glycol for EPDM; silicone grease for Viton). 3. Install the O-ring into the gland groove; ensure no twisting or pinching. 4. Place the gland assembly onto the clean workbench (stationary face up). 4.2 Pre-Assembly of Rotating Unit 1. Slide the spring onto the drive collar; ensure the spring is seated evenly and free of distortion. 2. Lubricate the rotary face O-ring with compatible lubricant; install into the rotary face groove. 3. Attach the rotary face to the drive collar; align the drive lugs and press firmly until seated. 4. Check spring free length: M481 standard free length = 12 mm; compression range = 1.5–2.0 mm (±0.2 mm tolerance). 4.3 Installation onto Shaft & Seal Chamber 1. Slide the stationary gland assembly over the shaft and into the seal chamber; hand-tighten the gland bolts diagonally (cross pattern) to avoid tilting. 2. Mark the shaft sleeve at the gland face (reference line 1). 3. Slide the rotating unit onto the shaft/sleeve; align the drive collar with the shaft key (if applicable). 4. Adjust the rotating unit position to achieve the correct spring compression: ◦ Measure the distance from reference line 1 to the rotating unit back face (setting dimension for M481: 10 ±0.2 mm). 5. Tighten the drive collar set screws (2×M4) to 3–4 N·m torque; secure with lock washers. 6. Finalize gland bolt torque: Tighten diagonally in 3 stages to 8–10 N·m (M8 bolts). 7. Critical: Remove all setting clips/transport locks from the seal faces after final torque. 4.4 Post-Assembly Checks 1. Manually rotate the shaft 2–3 full turns; rotation must be smooth, no binding, grinding, or tight spots. 2. Verify spring compression: Recheck the setting dimension; adjust if necessary. 3. Inspect seal faces: Confirm full contact, no gaps, scratches, or debris between faces. 5. Pre-Startup & Operation • Prime the pump: Fill the seal chamber with process liquid; never dry-run (even 3 seconds of dry running will damage the seal faces). • Remove all air from the seal chamber and piping. • Start the pump at low speed; gradually increase to rated speed. • Monitor during initial operation (5–10 minutes): ◦ Leakage: ≤1 drop per minute (normal for mechanical seals). ◦ Temperature: Seal chamber temperature ≤80°C. ◦ Vibration: No abnormal noise or vibration. 6. Maintenance & Troubleshooting 6.1 Routine Maintenance • Check leakage and temperature daily during operation. • Inspect seal faces and O-rings every 3 months (or 2,000 operating hours). • Replace O-rings every 6 months (or 4,000 operating hours) to prevent aging and leakage. 6.2 Common Issues & Solutions Problem Cause Solution Excessive leakage Incorrect spring compression; damaged O-ring; contaminated seal faces Adjust compression; replace O-ring; clean or replace seal faces High temperature Dry run; insufficient flush; misalignment Prime pump; increase flush flow; realign shaft/seal Short seal life Abrasive medium; poor lubrication; over-tightened bolts Install external flush (API Plan 32); use compatible lubricant; torque bolts correctly 7. Storage & Handling • Store M481 seals in a cool, dry place (temperature: 5–25°C; humidity: ≤60%). • Keep seals in original packaging until installation; avoid direct sunlight and dust. • Do not stack heavy objects on seal components to prevent distortion.   Jiaxing Burgmann Mechanical Seal Co., Ltd Email: doris@mechanicalseal.com.cn Mob: 86-15381220188 WhatsApp: 8615381220188 Website: www.industrial-mechanicalseals.com Add: A-5 Wanyangzhongchuangcheng, Ganyao Town, Jiashan county, Jiaxing, Zhejiang, China. 314107

1. Pre‑assembled Cartridge Design for Easy Installation & Reliability The M481 series is a factory‑preassembled and pre‑tested cartridge unit. This plug‑and‑play design eliminates on‑site assembly errors, reduces installation time and labor costs, and ensures consistent sealing performance right out of the box. It is delivered as a single integrated module, ready for direct mounting on agitators, reactors, and mixing vessels. 2. Bidirectional Rotation Independence Engineered with a non‑directional rotating mechanism (multiple rotating springs), the seal operates reliably regardless of shaft rotation direction (clockwise or counterclockwise). This flexibility simplifies equipment design and retrofitting, avoiding the need for custom seals for specific rotation directions. 3. Robust Sealing Performance Under Fluctuating Pressures A core advantage is its ability to remain tightly sealed during pressure variations or even pressure reversal. It supports both single‑seal operation with buffer fluid (up to 6 bar) and double‑seal operation with pressurized barrier fluid (max 12 bar), ensuring zero leakage in dynamic pressure environments. 4. Wide Operating Parameter Range • Pressure: Vacuum to 10 bar (single seal); up to 16 bar (double seal) • Temperature: -40°C to +200°C (‑40°F to +392°F), with high‑temperature variants for up to 350°C • Shaft Speed: Up to 3 m/s (16 ft/s), exceeding DIN standard limits for higher‑speed applications • Shaft Diameter: 40 mm to 220 mm, covering most standard agitator and reactor shaft sizes 5. Superior Material Versatility & Chemical Compatibility Customizable material combinations suit corrosive, abrasive, and high‑temperature media: • Seal Faces: Resin carbon, antimony‑impregnated carbon, silicon carbide (SiC), tungsten carbide (TC), alumina • Elastomers: FKM (Viton), FFKM (Kalrez), EPDM, NBR, AFLAS (resistant to acids, solvents, steam, and oils) • Metal Components: SS304, SS316, Duplex steel, Hastelloy C (for harsh chemical environments) • Metal‑free Product Side: Optional design for food, pharmaceutical, and ultra‑clean applications 6. DIN Standard Compliance for Easy Standardization & Retrofitting All mounting dimensions conform to DIN 28136 (vessels), DIN 28141 (flanges), and DIN 28154 (sleeves). This compliance enables seamless standardization across plants, easy replacement of old seals, and compatibility with carbon steel/stainless steel reactors without modifying equipment. 7. Optional Bearing Configuration for Enhanced Stability Available with or without an integrated bearing. The bearing‑equipped version reduces shaft runout and vibration in heavy‑duty agitators, extending seal life and improving operational stability in high‑load mixing applications. 8. Long Service Life & Reduced Maintenance Costs High‑precision manufacturing and wear‑resistant materials minimize friction and abrasion. The robust structure withstands thermal cycling, mechanical shocks, and continuous operation, reducing unplanned downtime and maintenance frequency. This lowers total ownership costs for industrial users. 9. Versatile Applications Across Industries Ideal for top‑entry agitators, reactors, and mixing vessels in: • Chemical & petrochemical (high‑pressure polymerization, corrosive media) • Pharmaceutical (sterile sealing, CIP/SIP compatibility) • Food & beverage (metal‑free options, FDA‑compliant materials) • Water & wastewater (abrasive media resistance) • Energy (thermal cycling, high‑temperature processes) 10. High Safety & Environmental Compliance Zero‑leakage performance prevents hazardous fluid emissions, meeting strict environmental regulations. The double‑seal design provides an extra safety barrier for toxic, flammable, or volatile media, protecting personnel and the environment.   Jiaxing Burgmann Mechanical Seal Co., Ltd Email: doris@mechanicalseal.com.cn Mob: 86-15381220188 WhatsApp: 8615381220188 Website: www.industrial-mechanicalseals.com Add: A-5 Wanyangzhongchuangcheng, Ganyao Town, Jiashan county, Jiaxing, Zhejiang, China. 314107