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

1. Check Operating Conditions Before Installation Before selecting and installing a mechanical seal, confirm the actual operating conditions of the reactor, including medium characteristics, temperature, pressure, vacuum level, rotation speed, and chemical compatibility. 2. Ensure Correct Seal Selection Select the appropriate mechanical seal type, materials, and design according to the process medium. Consider corrosion resistance, high-temperature performance, pressure conditions, and whether the medium contains particles or crystallizing substances. 3. Cleanliness During Installation Keep all seal components, especially sealing faces, clean during installation. Any dust, particles, oil contamination, or scratches on the seal faces may cause leakage or premature failure. 4. Check Shaft and Installation Accuracy Before installation, check the shaft condition, runout, alignment, and surface finish. Excessive shaft vibration or misalignment can reduce seal life and cause leakage. 5. Avoid Damage to Seal Faces The sealing faces are precision-machined components. Do not impact, scratch, or apply excessive force during assembly. Always handle seal faces carefully. 6. Lubrication and Cooling Requirements For high-temperature or vacuum reactor applications, ensure proper cooling, flushing, or barrier systems are available when required. Insufficient lubrication or cooling may result in overheating and seal face damage. 7. Start-Up Procedure Before starting the reactor, confirm that the sealing system is properly installed and that the cooling/flushing system is operating normally. Avoid dry running of the mechanical seal. 8. Control Operating Parameters Do not exceed the designed pressure, temperature, or speed limits of the mechanical seal. Sudden pressure changes, temperature shocks, or frequent start-stop operations may shorten seal service life. 9. Regular Inspection and Maintenance Regularly check for leakage, abnormal noise, vibration, and temperature increase. Replace worn sealing components promptly to prevent unexpected equipment downtime. 10. Proper Storage and Handling Store mechanical seals in a clean, dry environment away from moisture, chemicals, and direct sunlight. Keep sealing faces protected before installation. Important: A mechanical seal is a precision component. Correct selection, proper installation, and suitable operating conditions are essential to achieve reliable sealing performance and long service life.   1. Check Operating Conditions Before Installation Before selecting and installing a mechanical seal, confirm the actual operating conditions of the reactor, including medium characteristics, temperature, pressure, vacuum level, rotation speed, and chemical compatibility. 2. Ensure Correct Seal Selection Select the appropriate mechanical seal type, materials, and design according to the process medium. Consider corrosion resistance, high-temperature performance, pressure conditions, and whether the medium contains particles or crystallizing substances. 3. Cleanliness During Installation Keep all seal components, especially sealing faces, clean during installation. Any dust, particles, oil contamination, or scratches on the seal faces may cause leakage or premature failure. 4. Check Shaft and Installation Accuracy Before installation, check the shaft condition, runout, alignment, and surface finish. Excessive shaft vibration or misalignment can reduce seal life and cause leakage. 5. Avoid Damage to Seal Faces The sealing faces are precision-machined components. Do not impact, scratch, or apply excessive force during assembly. Always handle seal faces carefully. 6. Lubrication and Cooling Requirements For high-temperature or vacuum reactor applications, ensure proper cooling, flushing, or barrier systems are available when required. Insufficient lubrication or cooling may result in overheating and seal face damage. 7. Start-Up Procedure Before starting the reactor, confirm that the sealing system is properly installed and that the cooling/flushing system is operating normally. Avoid dry running of the mechanical seal. 8. Control Operating Parameters Do not exceed the designed pressure, temperature, or speed limits of the mechanical seal. Sudden pressure changes, temperature shocks, or frequent start-stop operations may shorten seal service life. 9. Regular Inspection and Maintenance Regularly check for leakage, abnormal noise, vibration, and temperature increase. Replace worn sealing components promptly to prevent unexpected equipment downtime. 10. Proper Storage and Handling Store mechanical seals in a clean, dry environment away from moisture, chemicals, and direct sunlight. Keep sealing faces protected before installation. Important: A mechanical seal is a precision component. Correct selection, proper installation, and suitable operating conditions are essential to achieve reliable sealing performance and long service life. 1. Check Operating Conditions Before Installation Before selecting and installing a mechanical seal, confirm the actual operating conditions of the reactor, including medium characteristics, temperature, pressure, vacuum level, rotation speed, and chemical compatibility. 2. Ensure Correct Seal Selection Select the appropriate mechanical seal type, materials, and design according to the process medium. Consider corrosion resistance, high-temperature performance, pressure conditions, and whether the medium contains particles or crystallizing substances. 3. Cleanliness During Installation Keep all seal components, especially sealing faces, clean during installation. Any dust, particles, oil contamination, or scratches on the seal faces may cause leakage or premature failure. 4. Check Shaft and Installation Accuracy Before installation, check the shaft condition, runout, alignment, and surface finish. Excessive shaft vibration or misalignment can reduce seal life and cause leakage. 5. Avoid Damage to Seal Faces The sealing faces are precision-machined components. Do not impact, scratch, or apply excessive force during assembly. Always handle seal faces carefully. 6. Lubrication and Cooling Requirements For high-temperature or vacuum reactor applications, ensure proper cooling, flushing, or barrier systems are available when required. Insufficient lubrication or cooling may result in overheating and seal face damage. 7. Start-Up Procedure Before starting the reactor, confirm that the sealing system is properly installed and that the cooling/flushing system is operating normally. Avoid dry running of the mechanical seal. 8. Control Operating Parameters Do not exceed the designed pressure, temperature, or speed limits of the mechanical seal. Sudden pressure changes, temperature shocks, or frequent start-stop operations may shorten seal service life. 9. Regular Inspection and Maintenance Regularly check for leakage, abnormal noise, vibration, and temperature increase. Replace worn sealing components promptly to prevent unexpected equipment downtime. 10. Proper Storage and Handling Store mechanical seals in a clean, dry environment away from moisture, chemicals, and direct sunlight. Keep sealing faces protected before installation. Important: A mechanical seal is a precision component. Correct selection, proper installation, and suitable operating conditions are essential to achieve reliable sealing performance and long service life.   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

o select a suitable mechanical seal, the following technical information should be provided. Accurate operating data helps ensure proper seal performance, reliability, and service life. ⸻ 1. Equipment Information 1.1 Equipment Type Please specify the equipment where the mechanical seal will be installed: * Centrifugal pump * Mixer / agitator * Reactor vessel * Compressor * Rotary equipment * Other special equipment Example: Equipment: Chemical centrifugal pump ⸻ 1.2 Manufacturer and Model Number Provide: * Equipment manufacturer * Pump / agitator model * Existing mechanical seal model (if available) Example: Pump Model: XYZ-100-50-200 Existing Seal: 59U / M7N ⸻ 1.3 Seal Installation Location Please indicate: * Pump side seal * Motor side seal * Agitator top entry seal * Bottom entry seal * Side entry seal ⸻ 2. Operating Conditions 2.1 Medium / Process Fluid Please provide: * Fluid name * Chemical composition * Concentration percentage * Presence of solids or particles Example: Medium: * Sulfuric acid 50% * Polyurethane resin * Diesel fuel containing FAME * Wastewater with particles ⸻ 2.2 Operating Temperature Provide: * Normal operating temperature * Maximum temperature * Minimum temperature Example: Operating temperature: 120°C Maximum temperature: 150°C ⸻ 2.3 Operating Pressure Provide: * Normal operating pressure * Maximum design pressure * Vacuum condition (if applicable) Example: Operating pressure: 8 bar Maximum pressure: 12 bar Vacuum: -0.8 bar ⸻ 2.4 Rotation Speed Provide shaft speed: * RPM (revolutions per minute) Example: Speed: 1450 RPM ⸻ 3. Mechanical Dimensions 3.1 Shaft Diameter The most important dimension: * Shaft diameter (d) * Sleeve diameter (if applicable) Example: Shaft diameter: 50 mm ⸻ 3.2 Seal Chamber Dimensions Provide: * Seal chamber diameter * Seal chamber depth * Installation length * Stuffing box dimensions ⸻ 3.3 Shaft Details Provide: * Shaft material * Shaft tolerance * Shaft runout * Surface finish ⸻ 4. Seal Design Requirements 4.1 Seal Type Please specify: Single Mechanical Seal Used for: * Clean fluids * Low leakage requirements Double Mechanical Seal Used for: * Toxic media * Flammable fluids * High-temperature applications * Vacuum applications ⸻ 4.2 Seal Arrangement Provide: * Internal seal * External seal * Back-to-back arrangement * Tandem arrangement ⸻ 4.3 Cartridge or Component Seal Please specify: * Cartridge mechanical seal * Component mechanical seal ⸻ 5. Material Selection 5.1 Seal Face Material Common combinations: Carbon / Silicon Carbide (C/SiC) Applications: * Water * General chemical service Silicon Carbide / Silicon Carbide (SiC/SiC) Applications: * Abrasive media * Corrosive chemicals * High temperature Tungsten Carbide / Carbon (WC/C) Applications: * High pressure * Heavy-duty applications ⸻ 5.2 Secondary Seal Material Provide elastomer requirement: * NBR * EPDM * FKM (Viton) * FFKM * PTFE Consider: * Chemical compatibility * Temperature resistance ⸻ 5.3 Metal Parts Material Common materials: * SS304 * SS316 * Hastelloy * Titanium ⸻ 6. Operating Environment Provide information about: 6.1 Installation Environment * Indoor / outdoor * Humidity * Dust * Corrosive atmosphere ⸻ 6.2 Special Requirements Examples: * Food grade requirement * FDA approval * ATEX requirement * API 682 compliance * Emission control requirement ⸻ 7. Flush and Support System Please provide: Single Seal: * Flush plan * Cooling requirement * External flushing Double Seal: * Barrier fluid type * Barrier pressure * Reservoir system * Circulation system ⸻ 8. Application History If replacing an existing seal, provide: * Previous seal model * Failure reason * Leakage problem * Operating hours * Photos of damaged seal ⸻ 9. Photos and Drawings Required Please provide: ✓ Equipment drawing ✓ Seal installation drawing ✓ Existing seal photo ✓ Shaft photo ✓ Seal chamber photo ✓ Nameplate photo ⸻ Mechanical Seal Selection Data Sheet (Customer Information) Equipment: Manufacturer: Model Number: Medium: Concentration: Temperature: Normal: ___ °C Maximum: ___ °C Pressure: Normal: ___ bar Maximum: ___ bar Vacuum: ___ bar Speed: ___ RPM Shaft Diameter: ___ mm Seal Type: □ Single Seal □ Double Seal □ Cartridge Seal Seal Face Material: O-ring Material: Metal Material: Flush System: Special Requirements: 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

A mechanical seal is designed to prevent fluid leakage between rotating equipment components, such as pumps, mixers, and reactors. However, leakage can occur due to many different reasons, including improper installation, incorrect seal selection, operating conditions, or equipment problems. Understanding the causes of mechanical seal leakage helps users improve equipment reliability and extend seal service life. 1. Dry Running of the Seal Faces One of the most common causes of mechanical seal failure is dry running. Mechanical seals rely on a thin lubricating film between the rotating face and stationary face. When the seal operates without sufficient liquid lubrication, the sealing faces generate excessive heat, causing: * Seal face damage * Cracking of carbon faces * Overheating * Rapid wear To avoid dry running, always ensure proper fluid circulation before starting the equipment. ⸻ 2. Improper Installation Incorrect installation is another major reason for seal leakage. Common installation problems include: * Damaged O-rings during assembly * Incorrect installation dimensions * Dirty sealing faces * Improper spring installation * Misalignment between shaft and seal The sealing faces must be clean, flat, and correctly aligned during installation. ⸻ 3. Wrong Mechanical Seal Selection A mechanical seal must be selected according to the actual operating conditions. Important factors include: * Temperature * Pressure * Rotational speed * Medium characteristics * Chemical compatibility For example, a standard carbon/ceramic seal may not be suitable for high-temperature chemical applications. In such cases, materials like silicon carbide, tungsten carbide, or special elastomers may be required. ⸻ 4. Excessive Vibration and Shaft Movement Equipment vibration can damage mechanical seals. Possible causes include: * Shaft misalignment * Bearing wear * Pump imbalance * Excessive shaft runout Continuous vibration can cause uneven wear of sealing faces and lead to leakage. ⸻ 5. Damaged or Incorrect Elastomers O-rings and rubber components provide secondary sealing. Leakage may occur when elastomers are: * Chemically attacked * Swollen or hardened * Cracked due to high temperature * Incorrectly selected Choosing the correct elastomer material, such as FKM, EPDM, or PTFE, is critical. ⸻ 6. Contaminated Sealing Medium Solid particles in the fluid can damage the sealing faces. Examples: * Sand * Metal particles * Crystallized materials * Slurry particles For abrasive media, special seal designs such as hard face combinations or double mechanical seals may be required. ⸻ 7. Incorrect Operating Conditions Mechanical seals may leak when actual operating conditions exceed design limits. Problems include: * Pressure exceeding seal rating * Temperature exceeding material limits * Running below minimum flow * Frequent start and stop cycles Always check that the seal operating conditions match the original design requirements   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. Check the Mechanical Seal Before Installation * Inspect all seal components carefully to ensure there is no damage, contamination, or deformation. * Verify that the seal model, size, materials, and operating parameters match the reactor requirements. 2. Cleanliness During Installation * Keep the working area clean and dust-free during installation. * Clean the shaft, seal chamber, and all sealing surfaces before assembly. * Avoid touching the seal faces with dirty hands or tools. 3. Shaft and Equipment Inspection * Check the shaft or sleeve surface for scratches, corrosion, or excessive wear. * Ensure the shaft runout and alignment are within the specified tolerance. * Confirm that the seal chamber dimensions meet the mechanical seal requirements. 4. Installation of Seal Faces * Handle the seal faces carefully to prevent scratches or impact damage. * Do not apply excessive force during installation. * Ensure the rotating and stationary faces are correctly aligned and fully seated. 5. O-Ring and Elastomer Installation * Check O-rings and elastomer parts for damage before installation. * Use a suitable lubricant compatible with the process medium when installing O-rings. * Avoid twisting, cutting, or overstretching elastomer components. 6. Spring and Rotating Parts Assembly * Ensure springs move freely without blockage. * Confirm the correct installation direction of rotating components. * Tighten all screws evenly according to the recommended torque. 7. Flushing and Cooling System * For high-temperature reactor applications, ensure the cooling or heating circulation system is properly connected. * Confirm that flushing liquid is clean and flowing before operation. * Avoid dry running of the mechanical seal. 8. Vacuum and Pressure Conditions * For vacuum reactor applications, check the seal design is suitable for negative pressure operation. * Perform a pressure and leakage test before starting the equipment. 9. Initial Operation Check * Rotate the shaft manually before startup to confirm smooth movement. * Start the reactor at low speed and monitor for abnormal vibration, noise, or leakage. * Check seal temperature and operating conditions during the first hours of operation. 10. Maintenance Recommendations * Regularly inspect leakage, vibration, temperature, and lubrication conditions. * Replace worn sealing components in time to prevent equipment damage. * Always follow the mechanical seal manufacturer’s installation instructions. Important: A mechanical seal is a precision component. Proper installation, clean working conditions, and correct operating parameters are essential to achieve reliable sealing performance and long service life   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

A typical mechanical seal includes: 1. Seal Faces The seal faces are the most important working parts. Common materials include carbon, silicon carbide, tungsten carbide, and ceramic. The selection depends on the operating conditions, such as pressure, temperature, speed, and the type of medium. 2. Secondary Seals O-rings, elastomers, or bellows are used to prevent leakage between the seal components and the equipment shaft. 3. Spring System The spring provides the necessary closing force to maintain contact between the seal faces during operation. 4. Metal Parts Metal components provide mechanical support and protection. Materials such as stainless steel, alloy steel, and special alloys are commonly used for corrosion resistance.   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-Work Safety Preparation * ☐ Confirm equipment is shut down and isolated (Lockout/Tagout applied) * ☐ Ensure zero pressure in pump and piping system * ☐ Drain and flush pump casing completely * ☐ Verify fluid is safe to handle (chemical/MSDS check) * ☐ Wear proper PPE (gloves, goggles, face shield, protective clothing) * ☐ Prepare clean working area to avoid contamination ⸻ 2. Pre-Disassembly Inspection * ☐ Record pump operating condition (temperature, pressure, leakage history) * ☐ Check seal leakage rate and location * ☐ Inspect coupling alignment condition (if accessible) * ☐ Mark relative positions of pump casing, gland, and shaft sleeve * ☐ Take photos before dismantling for reference ⸻ 3. Mechanical Seal Removal * ☐ Remove coupling guard * ☐ Disconnect coupling and check shaft movement * ☐ Remove pump cover / back pull-out assembly * ☐ Loosen gland plate bolts evenly in cross pattern * ☐ Carefully slide gland and seal assembly off shaft * ☐ Avoid scratching shaft sleeve or shaft surface * ☐ Remove stationary and rotating seal components separately * ☐ Keep seal faces clean and protected from impact * ☐ Inspect for abnormal wear pattern before cleaning ⸻ 4. Inspection After Removal * ☐ Check seal faces for cracks, heat marks, or scoring * ☐ Inspect elastomers (O-rings, gaskets) for swelling or hardening * ☐ Check shaft/sleeve for wear grooves or corrosion * ☐ Verify gland plate flatness and damage * ☐ Inspect bearing condition if axial/radial movement is suspected * ☐ Identify root cause of failure (dry running, misalignment, contamination, etc.) ⸻ 5. Preparation Before Installation * ☐ Clean all components with approved solvent * ☐ Ensure shaft/sleeve is smooth and burr-free * ☐ Replace worn sleeve or damaged components * ☐ Confirm correct seal type and material compatibility * ☐ Check installation dimensions against OEM drawing * ☐ Lightly lubricate O-rings (use compatible lubricant only) * ☐ Ensure seal faces are clean and not touched by hands ⸻ 6. Mechanical Seal Installation * ☐ Install stationary seat squarely into gland or housing * ☐ Ensure no tilt or misalignment during insertion * ☐ Install rotating seal unit onto shaft carefully * ☐ Avoid damaging elastomers during sliding * ☐ Position seal at correct installation length (per datasheet) * ☐ Tighten gland bolts evenly in cross pattern * ☐ Verify shaft rotation is smooth after assembly * ☐ Ensure correct spring compression / seal setting distance ⸻ 7. Reassembly of Pump * ☐ Reinstall pump casing and align components properly * ☐ Reconnect coupling and perform alignment check (laser/dial indicator) * ☐ Reinstall coupling guard * ☐ Confirm all bolts are torqued to specification * ☐ Reconnect flush / quench / barrier systems (if applicable) ⸻ 8. Pre-Start Checks * ☐ Verify pump is filled and fully primed * ☐ Confirm no dry running condition exists * ☐ Check seal support system pressure (if dual seal) * ☐ Ensure venting is complete * ☐ Rotate shaft manually to confirm no binding * ☐ Check instrument readings (pressure, temperature, flow) ⸻ 9. Start-Up Monitoring * ☐ Start pump and observe leakage level (initial slight leakage may occur) * ☐ Monitor vibration and noise * ☐ Check seal area temperature rise * ☐ Confirm stable operation within first 30–60 minutes * ☐ Inspect for abnormal leakage continuously * ☐ Record final operating parameters ⸻ 10. Post-Start Follow-Up * ☐ Re-check alignment after thermal stabilization * ☐ Verify seal chamber pressure stability * ☐ Confirm no abnormal wear signs after 24–48 hours * ☐ Log installation details for maintenance records   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 Requirements * Do not touch the seal faces with bare hands or any contaminated objects. * Always wear clean gloves during installation to avoid contamination. * Keep the installation area clean, dry, and free from dust and metal particles. * Ensure the seal model (M481), size, and materials are fully compatible with the working fluid. ⸻ 2. Pre-Installation Inspection * Check shaft or sleeve surface for scratches, corrosion, or wear. * Ensure shaft runout and alignment are within allowable limits. * Verify that the seal chamber and gland plate are clean and undamaged. * Confirm all seal components are complete and undistorted. ⸻ 3. Shaft and Equipment Requirements * Shaft surface must be smooth, clean, and properly chamfered. * Remove all burrs and sharp edges before installation. * Ensure proper concentricity between shaft and seal chamber. * Do not install the seal on a worn or undersized shaft surface. ⸻ 4. Handling of Seal Faces * Seal faces are precision-lapped components and must not be scratched. * Avoid dropping or impacting any seal parts. * Do not place seal faces directly on hard surfaces. ⸻ 5. Lubrication Requirements * Lightly lubricate O-rings with compatible lubricant before assembly. * Use clean water, glycol, or approved grease depending on elastomer material. * Do not use petroleum-based lubricants unless specified by manufacturer. ⸻ 6. Installation Precautions * Install stationary and rotating components in correct orientation. * Ensure correct spring compression according to installation dimension. * Tighten gland bolts evenly in a crisscross pattern to avoid distortion. * Do not over-tighten set screws or gland bolts. ⸻ 7. Alignment and Assembly Control * Maintain proper shaft alignment before final tightening. * Ensure uniform contact between seal faces after assembly. * Check that the rotating unit moves freely without binding. ⸻ 8. Pre-Start Checklist * Rotate shaft manually before starting the pump to ensure smooth operation. * Confirm that no dry-running condition exists. * Fill the seal chamber with process fluid and remove all air. * Verify that all installation tools, clips, and locking devices are removed. ⸻ 9. Operation Warning * Dry running is strictly prohibited even for a few seconds. * Monitor initial operation for leakage, vibration, and temperature rise. * Stop the pump immediately if abnormal noise or leakage occurs.   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

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

1. Sealing Structure • Mechanical seal: Face contact static & dynamic seal, precision end-face friction pair • Gland packing: Soft packing compression seal, contact shaft circumferentially 2. Leakage Performance • Mechanical seal: Extremely low leakage, nearly zero leakage • Gland packing: Obvious allowable leakage, cannot achieve zero leakage 3. Service Life • Mechanical seal: Long service life, low replacement frequency • Gland packing: Short service life, easy wear, frequent replacement 4. Friction & Power Consumption • Mechanical seal: Small friction resistance, low power loss • Gland packing: Large friction resistance, high energy consumption 5. Maintenance • Mechanical seal: Maintenance-free in service, simple replacement • Gland packing: Needs regular tightening and frequent maintenance 6. Application • Mechanical seal: Pumps, reactors, high speed / high pressure / corrosive working conditions • Gland packing: Low pressure, low speed, simple ordinary equipment   Jiaxing Burgmann Mechanical Seal Co., Ltd Email: doris@mechanicalseal.com.cn Skype: kathysunlin Fax: 86-573-84072317 Mob: 86-15381220188 WhatsApp: 8615958372402 Website: www.industrial-mechanicalseals.com Add: A-5 Wanyangzhongchuangcheng, Ganyao Town, Jiashan county, Jiaxing, Zhejiang, China. 314107