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

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

1. Reliable Sealing: Extremely low leakage (≈1% of soft packing seals); stable performance during long-term operation. 2. Long Service Life: 1–2 years in oil/water media, ≥6 months in chemical media. 3. Low Friction Loss: Friction power consumption is only 10%–50% of soft packing seals. 4. Minimal Shaft Wear: Shaft/sleeve remains almost unworn. 5. Long Maintenance Intervals: Automatic wear compensation; no frequent maintenance needed. 6. Good Vibration Resistance: Insensitive to shaft vibration, runout, or seal cavity misalignment. 7. Wide Application Range: Suitable for high/low temperature, high pressure, vacuum, and corrosive/abrasive media. 8. Adaptability to Twin-Screw Pumps: Matches screw pump characteristics (stable flow, low pulsation); compatible with non-lubricating/viscous media. Precautions for Use Installation 1. Alignment & Concentricity: ◦ Tighten gland bolts evenly after coupling alignment; face runout ≤0.05 mm. ◦ Gland-to-shaft/sleeve clearance uniform; concentricity tolerance ≤0.01 mm. 2. Spring Compression: Compress per specifications (error ≤2 mm); excessive compression accelerates wear, insufficient causes leakage. 3. Dynamic Ring Flexibility: Ensure free axial movement; must rebound automatically when pressed. 4. Cleanliness: Keep sealing elements and cavity free of debris; lubricate with compatible fluid during assembly.   Jiaxing Burgmann Mechanical Seal Co., Ltd Email: doris@mechanicalseal.com.cn Skype: kathysunlin Fax: 86-573-84072317 Mob: 86-15381220188 WhatsApp: 8615381220188 Website: www.industrial-mechanicalseals.com Add: A-5 Wanyangzhongchuangcheng, Ganyao Town, Jiashan county, Jiaxing, Zhejiang, China. 314107

1. Reasonable Selection of Mechanical Seal Type & Material Proper model and material selection is the fundamental premise to extend mechanical seal service life. • Select seal structure according to working conditions: medium temperature, pressure, rotating speed, viscosity and corrosiveness. • Match friction pair materials reasonably: such as silicon carbide, tungsten carbide, carbon graphite, ceramic; avoid unreasonable hard-to-hard or soft-to-soft pairing. • Choose suitable auxiliary sealing materials (O-ring, gasket): EPDM, Viton, PTFE, HNBR etc., adapt to medium corrosion, temperature resistance and aging resistance requirements. • For high temperature, high pressure, easy crystallization and particle-containing media, adopt balanced mechanical seals or tandem seal arrangement. 2. Strictly Control Installation Accuracy & Standard Operation Improper installation is the main cause of early failure of mechanical seals. • Ensure the shaft or sleeve runout, axial displacement and radial clearance comply with technical standards. • Keep the seal chamber clean without impurities, burrs and welding slag before installation. • Use special assembly tools; avoid knocking, scratching the seal face and elastic components. • Control compression amount of the spring properly: too large compression leads to rapid wear and heat; too small causes leakage. • Install static and dynamic rings in place; ensure sealing face fits closely without deflection. 3. Optimize Operating Working Conditions Avoid overload and abnormal operation to reduce seal wear and thermal damage. • Prohibit long-time dry running: mechanical seals must work with liquid film lubrication; dry friction will burn the seal face quickly. • Control medium temperature: avoid overheating causing material aging, seal face thermal deformation and liquid film vaporization. • Stabilize working pressure: prevent sudden pressure surge, vacuum negative pressure and frequent start-stop impact. • Limit allowable linear speed: select high-speed type seal for high rotating speed equipment to avoid excessive friction heat. 4. Effective Flushing, Cooling & Lubrication System Adopt auxiliary pipeline systems to improve seal operating environment. • Set up seal flushing (Plan 11 / Plan 21 / Plan 23 / Plan 52 / Plan 53 etc.) to take away friction heat and prevent local overheating. • Apply cooling and heat preservation for high-temperature and low-temperature working conditions to avoid material cold brittleness or high-temperature aging. • For media with solid particles, install filter or adopt back flushing to prevent particles from entering the seal face and causing abrasive wear. • Maintain stable liquid film between seal end faces to ensure lubrication and cooling effect. 5. Medium Treatment & Impurity Control Solid particles, crystallization and dirt in the medium will seriously shorten seal life. • Install filters, magnetic separators to reduce solid particles and impurities in the medium. • For easy crystallization and viscous media, take heat tracing and dilution measures to prevent crystallization deposition on seal parts. • Control medium pH value and corrosivity; select anti-corrosion materials matching the medium property. 6. Daily Maintenance, Inspection & Periodic Overhaul Standard daily management can timely eliminate hidden troubles and delay seal failure. • Regularly check leakage amount, equipment vibration, noise, temperature and pipeline flushing condition. • Avoid equipment abnormal vibration, shaft misalignment and base loosening which will aggravate seal wear. • Replace aging elastic elements (O-rings, springs) regularly even without obvious leakage. • Do frequent inspection after equipment startup and load change; handle slight leakage in time to avoid deterioration. 7. Avoid Frequent Start-Stop & Abnormal Working Conditions • Frequent start-stop will cause repeated separation and contact of seal faces, damaging the liquid lubrication film and accelerating wear. • Avoid idle running, low-load long-time operation and medium cut-off operation. • Carry out soft start and slow down shutdown to reduce mechanical impact on seals.   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

1. Safety & Pre-Installation Preparation 1.1 Safety Precautions • Lockout/Tagout: Confirm the reactor/agitator is disconnected from power, fully depressurized, and all internal media is drained and cleaned. • PPE: Wear chemical-resistant gloves, safety goggles, and clean work clothes to prevent contamination and injury. • Environment: Maintain a clean, dry, dust-free workspace. Prevent any particles from entering seal faces. 1.2 Component & Dimension Inspection • Verify Model: Ensure seal type, size, and material match equipment specifications (shaft diameter, seal chamber dimensions, pressure/temperature ratings). • Check Parts: Inspect rotating ring, stationary ring, springs, O-rings, shaft sleeve, gland, and fasteners. Reject any parts with cracks, chips, scratches, deformation, or corrosion. • Shaft & Chamber Tolerances: ◦ Shaft OD tolerance: ±0.05 mm (±0.002 in) ◦ Shaft radial runout: ≤ 0.1 mm T.I.R. ◦ Shaft axial end float: ≤ 0.13 mm (0.005 in) ◦ Seal chamber face squareness to shaft: ≤ 0.0005 in/in (0.5 μm/mm) ◦ Shaft surface roughness: ≤ 1.6 μm; shaft tolerance: h8 ◦ Shaft sleeve end must have a 3×20° smooth chamfer 1.3 Thorough Cleaning • Clean shaft, sleeve, seal chamber, flange faces, and gland with alcohol or acetone; remove all oil, grease, and debris. • Wipe seal faces (rotating/stationary rings) with a lint-free soft cloth; never touch or scratch lapped faces. • Clean all tools; avoid contamination. 1.4 Lubrication • Apply a thin, compatible lubricant (food-grade silicone grease, clean machine oil, or manufacturer-recommended lubricant) to: ◦ Shaft/sleeve surface ◦ O-rings and secondary seals ◦ Mating faces of rotating and stationary rings • Note: For EPDM, butyl, or FKM O-rings, avoid incompatible mineral oils. 2. Installation Procedure (Standard Single-Ended Seal) 2.1 Install Stationary Ring Assembly 1. Fit the stationary ring’s secondary seal (O-ring) onto the back of the stationary ring. 2. Insert the stationary ring into the seal chamber/gland. Align anti-rotation pins with anti-rotation slots (no hard contact). 3. Ensure the stationary ring face is perpendicular to the shaft centerline. 4. Install the gland onto the reactor flange. Tighten bolts crosswise and evenly in 2–3 stages to specified torque; avoid distortion. 2.2 Install Rotating Ring Assembly 1. Slide the shaft sleeve (if used) onto the shaft; align keyway and secure with set screws to manufacturer torque. 2. Assemble rotating ring, spring(s), and drive seat on the sleeve/shaft. 3. Use a guide sleeve to protect seal faces; slide assembly into position. Do not strike or force. 4. Verify springs are uniformly compressed, free of binding, and provide even pressure. 5. Tighten drive set screws evenly and crosswise to lock the assembly to the shaft. 2.3 Final Alignment & Check 1. Manual Rotation: Spin the shaft by hand. It must rotate smoothly, no binding, noise, or excessive friction. 2. Runout Check: Use a dial indicator to measure rotating ring face runout. Max allowed: ≤ 0.05 mm T.I.R. 3. Spring Function: Push the rotating ring axially; it should bounce back freely without sticking. 4. Remove any setting clips, lock pins, or transport locks before operation. 2.4 Cartridge Seal Installation (if applicable) 1. Align cartridge seal with shaft and chamber; ensure flange bolt holes match. 2. Slide cartridge into place; use centering guides if provided. 3. Hand-tighten flange bolts; align and check runout (≤ 0.05 mm). 4. Torque bolts to specs in a crosswise pattern. 5. Remove setting clips before startup. 3. Auxiliary System Connection (Double Seal / API Plans) • For dual seals (Plan 52, 53, 54), connect flush, cooling, or barrier fluid lines. • Ensure barrier fluid pressure is 0.05–0.1 MPa higher than kettle pressure per design. • Check for leaks in piping; purge air from circuits. 4. Post-Installation Testing 1. Static Pressure Test: Pressurize to 1.25× design pressure; hold 10–30 minutes. No visible leakage. 2. Dry Run (Optional): Run idle for 15–30 minutes to check heat, noise, and seal performance. 3. Check for abnormal heat, vibration, or leakage during initial operation. 5. Critical Installation Rules • Never use hard tools to strike seal components. • Never touch or contaminate lapped seal faces. • Even torque only — avoid over-tightening or uneven bolting. • Maintain cleanliness at all stages. • Follow manufacturer-specific dimensions (spring compression ±0.2 mm).   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

I. Core Advantages (Compared with Conventional Spring Seals) 1. Excellent Adaptability to High & Low Temperatures • No vulnerable components prone to failure under extreme temperatures • Stable performance in high-temperature, low-temperature and fluctuating temperature conditions 2. Superior Axial Flexibility & Compensation Ability • Metal bellows act as both elastic element and secondary seal • Effectively compensates for shaft runout, axial movement and installation misalignment 3. No Clogging & Long Service Life • No small springs that may get stuck by particles, crystals or viscous media • Reduces frequent maintenance and replacement 4. Strong Corrosion Resistance • Made of high-grade alloys (Hastelloy, Inconel, stainless steel, etc.) • Suitable for corrosive, toxic and hazardous media 5. Zero Leakage & High Reliability • Integral welded structure minimizes leakage points • Ideal for flammable, explosive and environmentally sensitive fluids 6. Wide Pressure & Speed Range • Performs well in high-pressure and high-speed working conditions • Maintains stable sealing under variable working loads II. Operating Instructions 1. Installation Requirements • Keep sealing surfaces clean and scratch-free • Ensure concentricity of shaft and sealing cavity • Tighten fasteners evenly to avoid distortion 2. Media Compatibility • Select appropriate bellows material according to medium properties, temperature and concentration • Not recommended for media causing severe erosion or rapid crystallization 3. Start-Up & Operation • Run-in at low speed and pressure before full operation • Avoid dry running, which may cause overheating and damage • Maintain stable lubrication and cooling conditions 4. Maintenance & Inspection • Regularly check for leaks, abnormal noise or vibration • Inspect bellows for cracks, deformation or fatigue damage • Replace worn sealing faces and gaskets in a timely manner 5. Storage Conditions • Store in dry, dust-free environment away from direct sunlight • Prevent collision or compression that may deform the bellows   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

Mechanical seals are critical components in rotating machinery such as pumps, compressors, and mixers, responsible for preventing fluid leakage between rotating and stationary parts. Their service life directly affects the operational stability, maintenance cost, and production efficiency of the entire equipment system. The following detailed technical measures are formulated to effectively prolong the service life of mechanical seals from the perspectives of model selection, installation and commissioning, operational control, daily maintenance, and working condition optimization. 1. Scientific and Reasonable Model Selection and Material Matching Model selection is the primary prerequisite for ensuring the long-term stable operation of mechanical seals. It is essential to conduct comprehensive matching based on actual operating parameters and medium characteristics. • Match with operating parameters: Accurately calculate and confirm the operating pressure, temperature, rotating speed, and shaft diameter of the equipment. Select mechanical seals suitable for high-pressure, high-temperature, low-temperature, or high-speed working conditions to avoid overload operation caused by improper model selection. • Select sealing materials according to medium characteristics: For corrosive media, choose corrosion-resistant sealing end faces and auxiliary sealing materials, such as silicon carbide, tungsten carbide for end faces, and perfluoroelastomer for auxiliary seals. For abrasive media, give priority to wear-resistant and scouring-resistant material combinations to resist particle erosion. • Consider application scenarios: Select appropriate structural forms such as single-end face, double-end face, or cartridge mechanical seals for special working conditions like high dust, easy crystallization, and toxic media, to enhance the adaptability of the seal. 2. Standardized Installation and Commissioning Operations Non-standard installation is one of the main causes of premature failure of mechanical seals. Strictly follow the technical specifications for installation and commissioning. • Pre-installation inspection: Check the dimensional accuracy, surface roughness, and wear degree of the shaft, shaft sleeve, sealing cavity, and mating parts; ensure no burrs, scratches, or deformation. Clean all parts thoroughly to remove iron filings, dust, and impurities. • Control installation accuracy: Ensure the radial runout of the shaft meets the standard, avoid excessive shaft eccentricity and axial movement; strictly control the compression amount of the mechanical seal spring to prevent over-compression leading to excessive end face wear or under-compression causing leakage. • Ensure concentricity and parallelism: Guarantee the high concentricity between the rotating and stationary parts of the seal, and the high parallelism of the sealing end faces to avoid uneven stress and partial wear. • Pre-lubrication treatment: Apply a thin layer of clean lubricating grease or compatible medium on the sealing end faces and auxiliary seals before installation to avoid dry friction damage during initial startup. 3. Optimize Operating Conditions and Avoid Abnormal Operation Stable operating conditions can greatly reduce the wear and damage of mechanical seals, and avoid various abnormal working states. • Prevent dry friction: Ensure sufficient lubrication and flushing of the sealing end faces at all times. Configure a special flushing pipeline for equipment prone to insufficient lubrication, and control the flow and pressure of the flushing liquid to take away friction heat and block impurities. • Stabilize operating parameters: Avoid frequent fluctuations in operating pressure, temperature, and speed; prevent sudden load changes, frequent startup and shutdown, and idle running, which will cause thermal shock and mechanical impact on the sealing end faces. • Block impurity intrusion: Install filters, strainers, and other devices at the equipment inlet to prevent solid particles, sediment, and other impurities from entering the sealing cavity, so as to avoid scratching and abrasion of the sealing end faces. • Control medium crystallization and scaling: For media prone to crystallization and scaling, adopt appropriate flushing, cooling, or heat preservation measures to prevent crystal particles from adhering to the sealing end faces and causing seal failure. 4. Regular Daily Maintenance and Timely Fault Handling Implement standardized maintenance management to detect and deal with potential faults of mechanical seals in advance. • Regular inspection: Regularly check the sealing part for leakage, abnormal noise, vibration, and overheating during equipment operation; monitor the temperature of the sealing cavity and the state of the flushing system in real time. • Periodic maintenance: Formulate a periodic maintenance plan according to the operating cycle and working conditions, replace worn sealing end faces, damaged auxiliary seals, and failed springs in a timely manner; check and adjust the compression state of the elastic elements. • Timely handling of abnormal faults: Once slight leakage, abnormal temperature rise, and other problems are found, stop the machine for inspection immediately instead of continuing operation with faults, so as to prevent minor faults from expanding and causing complete damage to the mechanical seal. 5. Reasonable Storage and Spare Part Management For spare mechanical seals, scientific storage is also crucial to avoid performance degradation before installation. • Control storage environment: Store in a dry, cool, and dust-free environment, avoid direct sunlight, high temperature, and heavy pressure, to prevent aging, deformation, and rusting of auxiliary seals and elastic parts. • Protect sealing end faces: Cover the sealing end faces with protective covers to avoid collision and scratch damage; do not disassemble the original packaging at will before installation. • Rotate spare parts usage: Follow the principle of first-in first-out for spare parts to avoid long-term idle storage leading to performance failure of sealing components.   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

Balanced mechanical seals represent a superior sealing solution for rotating equipment, offering a host of performance, efficiency, and economic benefits that make them the preferred choice for demanding industrial applications. Unlike unbalanced seals, their design strategically reduces hydraulic loading on seal faces, unlocking transformative advantages across operating conditions. Extended Service Life & Reduced Wear The core advantage lies in controlled face pressure. By minimizing hydraulic closing forces, balanced seals drastically lower friction and wear between mating surfaces. This design typically extends seal life by 300–500% compared to unbalanced alternatives, cutting replacement frequency and maintenance labor. Even under high pressures, face loading remains stable, preventing rapid degradation and ensuring consistent performance over time. Superior High-Pressure Capability Balanced seals excel in high-pressure environments (typically above 50 psi/3.4 bar) where unbalanced designs fail. Their hydraulic balance maintains stable face contact across fluctuating pressures, eliminating leakage risks in critical applications like refineries, chemical plants, and high-pressure pumping systems. This versatility eliminates the need for specialized seals across different pressure ranges. Enhanced Energy Efficiency Reduced friction directly translates to lower power consumption. Balanced seals require significantly less operating energy than unbalanced counterparts, with power losses often just 10–50% of traditional packing seals. Over continuous operation, this efficiency yields substantial energy cost savings and aligns with sustainability goals. Lower Heat Generation & Thermal Stability Minimized friction produces far less heat at seal faces. This thermal stability prevents material degradation, protects adjacent components (bearings, gaskets), and reduces cooling system demands. Lower operating temperatures also preserve fluid properties, making balanced seals ideal for temperature-sensitive processes. Improved Reliability & Leak Prevention Consistent face pressure ensures reliable sealing across variable conditions, drastically reducing unplanned downtime. Near-zero leakage meets strict environmental and safety standards, preventing product loss, contamination, and regulatory penalties. Predictable performance enables proactive maintenance scheduling, avoiding costly emergency repairs. Versatility & Application Adaptability Balanced seals perform reliably with corrosive chemicals, high/low temperatures, and poor-lubricity fluids. They adapt to high speeds, vacuum conditions, and aggressive media, serving industries from petrochemical to pharmaceuticals. This broad applicability simplifies inventory management by standardizing seal types across equipment. Economic Benefits While initial costs may be higher, long-term savings dominate: reduced maintenance, fewer replacements, lower energy use, and minimal product loss often deliver ROI within the first year. Lower spare parts inventory and simplified procurement further boost cost-effectiveness. Conclusion Balanced mechanical seals deliver a compelling combination of longevity, efficiency, and reliability. Their design addresses critical limitations of unbalanced seals, making them indispensable for modern industrial operations seeking performance, safety, and sustainability. For high-pressure, high-value, or critical applications, they represent not just an upgrade, but a necessary investment in operational excellence.     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

Large‑spring mechanical seals are a robust sealing solution widely used in pumps, mixers, reactors, and other rotating equipment across industries such as chemical processing, pulp and paper, wastewater treatment, and power generation. Compared with multi‑spring and conventional packing seals, they deliver unique performance and reliability benefits in demanding operating conditions. 1. Exceptional Anti‑Clogging & Anti‑Jamming Performance The large‑spring design features a large coil pitch and open structure, which effectively prevents clogging caused by solid particles, slurry, crystalline substances, or fibrous media in the fluid. Unlike small multi‑springs that easily trap debris and lose elasticity, large springs maintain consistent compression force and avoid spring failure due to blockage, making them ideal for abrasive or dirty media applications. 2. Stable & Uniform Sealing Force A single large spring provides concentrated, uniform axial closing force across the entire seal face, ensuring stable contact pressure even under fluctuating pressure, temperature, or shaft movement. This eliminates uneven wear common with multi‑spring arrangements and maintains reliable sealing performance over long service periods. 3. Strong Adaptability to Shaft Misalignment & Axial Movement Large springs offer greater flexibility and deflection range, accommodating minor shaft runout, eccentricity, and axial displacement caused by bearing wear, thermal expansion, or mechanical vibration. The seal faces can “follow” shaft movement dynamically, preserving sealing integrity and reducing leakage risks in less‑than‑ideal installation conditions. 4. Excellent Corrosion & High‑Temperature Resistance Large springs are typically manufactured from high‑grade stainless steel (316/316L), Hastelloy, or other corrosion‑resistant alloys, delivering superior durability in corrosive, high‑temperature, or harsh chemical environments. Their robust construction resists fatigue and maintains elasticity better than small springs under prolonged stress. 5. Simplified Structure & Easy Installation & Maintenance Large‑spring seals have fewer components and a more straightforward design than multi‑spring types, simplifying assembly, disassembly, and on‑site maintenance. The single‑spring structure reduces alignment complexity, shortens downtime during replacement, and lowers labor and operational costs. 6. Extended Service Life & Reduced Total Cost of Ownership With stable force, anti‑clogging capability, and minimal wear, large‑spring seals achieve longer operational lifespans and require less frequent replacement. Lower maintenance frequency and reduced unplanned downtime significantly cut long‑term operating expenses, offsetting higher initial investment compared to packing seals. 7. Wide Applicability Across Harsh Industrial Environments These seals perform reliably in high‑pressure, high‑temperature, abrasive, and corrosive conditions, serving pulp and paper, chemical, mining, wastewater, and pharmaceutical industries. They are particularly well‑suited for equipment handling slurry, fibrous fluids, and media with solid impurities. Conclusion Large‑spring mechanical seals stand out for their anti‑clogging performance, stable sealing force, shaft misalignment tolerance, corrosion resistance, ease of maintenance, and long service life. They represent a cost‑effective, high‑reliability sealing choice for heavy‑duty industrial applications, helping improve equipment efficiency, reduce leakage risks, and support sustainable, compliant operations.   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

Double mechanical seals (also called dual mechanical seals) are advanced sealing systems with two sets of sealing faces, offering superior performance over single mechanical seals in demanding industrial applications. Below is a comprehensive article on their core advantages. Enhanced Safety and Leak Prevention The most critical benefit of double mechanical seals is their redundant sealing design. With two independent sealing interfaces, they create dual barriers against fluid leakage. Even if the primary seal wears out or fails, the secondary seal maintains containment, eliminating risks of hazardous fluid release. This makes them ideal for handling toxic, flammable, corrosive, or environmentally sensitive fluids, where even minor leaks pose severe safety and environmental threats. Superior Operational Reliability Double mechanical seals deliver unmatched reliability in harsh conditions. The barrier fluid system between the two seals provides consistent lubrication and cooling for both sealing faces, reducing friction and thermal damage. This controlled operating environment minimizes seal face wear, significantly extending service life compared to single seals. They also withstand high pressure, extreme temperatures, and abrasive media better than single seals, ensuring stable performance in heavy-duty industrial processes. Improved Equipment Efficiency and Uptime By reducing seal wear and preventing unexpected failures, double mechanical seals cut down on unplanned downtime. The barrier fluid acts as an early warning system—contamination in the fluid signals primary seal degradation before a catastrophic failure occurs, enabling predictive maintenance. This reduces repair frequency and equipment overhaul intervals, boosting overall operational efficiency. Additionally, lower friction between components improves energy efficiency. Environmental Compliance and Contamination Control Double mechanical seals effectively prevent fugitive emissions, meeting strict environmental regulations. They also isolate process fluids from external contaminants, maintaining media purity in high-purity applications. This dual protection ensures compliance with global environmental standards and supports corporate sustainability goals. Cost-Effectiveness in Long-Term Operation Though double mechanical seals have higher upfront costs than single seals, their long-term benefits outweigh the investment. Longer seal life reduces replacement and labor costs; fewer failures cut downtime and production losses; and lower maintenance requirements lower total operational expenses. For critical applications, the cost savings from avoided accidents, environmental fines, and equipment damage are substantial. Versatility and Adaptability Double mechanical seals suit diverse industrial scenarios, including petrochemical, pharmaceutical, food processing, and water treatment. They can be configured as pressurized (double seals) or unpressurized (tandem seals) to match specific process needs. Flexible barrier fluid selection (water, oil, synthetic fluids) further adapts them to different operating conditions. Conclusion Double mechanical seals stand out as a high-performance sealing solution, offering enhanced safety, reliability, efficiency, environmental compliance, and long-term cost savings. For industries handling hazardous fluids or operating in demanding environments, they are the preferred choice to ensure equipment stability, personnel safety, and environmental protection.   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

1. What is a mechanical seal A mechanical seal is a device used to prevent fluid leakage along a rotating shaft in pumps, compressors, mixers, and other rotating equipment. It uses two flat faces (rotating and stationary) in contact to form a sealing barrier, supported by springs and secondary seals. 2. Main functions - Seal liquids and gases inside equipment - Prevent external leakage and pollution - Reduce energy loss - Protect bearings and gearboxes from fluid damage - Improve safety and reliability of rotating machinery 3. Basic structure - Rotating ring: rotates with the shaft - Stationary seat: fixed to the equipment housing - Spring component: provides closing force - Secondary seals: O-rings, gaskets, PTFE parts - Retainer and clamping parts 4. Common types - Single mechanical seal - Double mechanical seal - Tandem seal - Cartridge mechanical seal - Balanced seal - Unbalanced seal - Metal bellows seal - Spring seal - Conical spring seal 5. Common face materials - Carbon graphite - Silicon carbide (SiC) - Tungsten carbide - Ceramic - Stellite 6. Common elastomer materials - Nitrile rubber (NBR) - Fluororubber (FKM / Viton) - EPDM - Silicone - PTFE 7. Key working parameters - Operating pressure - Operating temperature - Shaft speed - Shaft diameter - Medium type (water, oil, chemical, corrosive fluid) - Wear resistance - Corrosion resistance - Thermal stability 8. Application industries - Petrochemical & chemical industry - Oil & gas - Water treatment & sewage - Power plants - Pharmaceutical - Food & beverage - Paper making - Mining - Marine & shipbuilding 9. Failure causes (common) - Improper installation - Dry running - Excessive pressure or temperature - Abrasive particles in fluid - Material incompatibility - Vibration and shaft runout - Poor flushing and cooling 10. Industry requirements - High reliability - Long service life - Low leakage - Easy installation and maintenance - Energy saving - Compliance with international standards (API, ISO, DIN) 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  

Mechanical seal flushing plans are standardized piping arrangements defined by API 682 to cool, lubricate, clean, and pressurize seal chambers, extending seal life and ensuring reliable operation. Below are the most common plans with concise English descriptions for technical documentation and catalogs.   Basic Internal Recirculation Plans   - Plan 01 Internal flow passages within the pump casing circulate process fluid to the seal chamber without external piping. Simple, low-cost, and suitable for clean, low-temperature services.   - Plan 11 Process fluid recirculates from the pump discharge through a flow-control orifice to the seal chamber. The most widely used plan for clean fluids, providing effective cooling and lubrication with minimal complexity .   - Plan 13 Fluid flows from the seal chamber back to the pump suction via a restricted orifice. Ideal for vertical pumps to prevent vapor locking and ensure continuous venting .   Cooled & Filtered Recirculation Plans   - Plan 21 Discharge fluid passes through a heat exchanger (cooler) and flow-control orifice before entering the seal chamber. Designed for high-temperature applications to lower seal chamber temperature .   - Plan 22 Combines Plan 21 with a Y-strainer to filter solids from the recirculating fluid. Suited for fluids with light particulate contamination .   - Plan 23 Closed-loop circulation with a dedicated heat exchanger; fluid is pumped from the seal chamber, cooled, and returned. Highly efficient for extreme-temperature services, minimizing process fluid usage .   External & Specialized Plans   - Plan 32 Clean, compatible fluid from an external source is injected directly into the seal chamber. Used for dirty, polymerizing, or high-solids fluids to isolate the seal from process contaminants .   - Plan 41 Recirculation with a cyclone separator to remove solids from the flush stream. Effective for fluids with moderate to high solid content .   Dual Seal Support Plans   - Plan 52 Unpressurized buffer fluid system for dual seals; circulates buffer fluid between inner and outer seals with a reservoir and heat exchanger. Used for toxic or hazardous fluids .   - Plan 53A/B/C Pressurized barrier fluid systems for dual seals, maintaining barrier fluid pressure above process pressure to prevent leakage. Available with bladder accumulators (53A), piston accumulators (53B), or external pumping (53C) .   - Plan 54 Pressurized barrier fluid supplied from an external source to dual seals. Suitable for critical, high-pressure, or corrosive applications requiring continuous clean fluid supply .   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