Mechanical Seals

The Type 21 mechanical seal (also styled 21 T) is a single-end, elastomer bellows mechanical seal, originally developed by John Crane and now a de facto industry standard . It’s compatible with a broad range of rotating equipment, including centrifugal, rotary, and turbine pumps, mixers, compressors, chillers, and agitators. Common application areas include water treatment, pulp & paper, food & beverage, wastewater, HVAC, pool/spa systems, and general industrial processes

• Versatility in mounting and pump compatibility.

• Low leakage due to balanced face loading.

• Self-compensation for wear, run-out, and axial movement.

• Minimal clogging from outside-spring and bellows design.

• Field-serviceable, with easily replaceable parts.

The CURC lineup offers a robust cartridge mechanical seal platform:

• Flexible, with wide face-material choices.

• High-performing, with solid ratings up to 15 m/s speed, 125 mm shaft, and ~25 bar pressure.

• Durable, thanks to SiC face protection from impact and hydraulic balancing.
  
  
  
  

  Core Design Features

   

  • Self‑aligning stationary head, centering the seal faces to prevent angular misalignment and reduce stress on SiC faces .

  • Advanced third-generation SiC optimization, minimizing metal-to-SiC impact at startup to prevent stress cracks .

  • Balanced hydraulics reduce heat, power consumption, and enhance face stability under pressure.
    
    
    

     Performance Parameters

    • Shaft diameters: 24 mm to 125 mm (approx. 1″–5″).

    • Pressure rating: Up to 2.5 MPa (~25 bar / 362 psi) in general; some aftermarket versions specify up to 28 bar (~2.8 MPa) .

    • Temperature range: −20 °C to +150 °C (standard); some variants support up to +220 °C .

    • Maximum speed: ≤ 15 m/s surface speed .

    🏭 Applications

    Designed for versatile and demanding uses, including:

     

    • Centrifugal pumps (chemical, water, oil)

    • Mixers, agitators, reactors

    • API‑610 pump upgrades

    • Hazardous or abrasive environments with corrosion/chemical resistance needs

We offer a full spectrum of mechanical seals—single, double, cartridge, bellows, pusher, and metal‑bellows designs—tailored for pump, compressor, mixer, and rotary machine applications across industries such as petrochemical, water, mining, and pharmaceuticals.

• Pressure Range: 6 bar (BT‑AR) up to 25 bar (MG/M series) and beyond with cartridge seals; some dual/gas-lubricated types exceed 30 bar.

• Temperature Range: Elastomer designs: –50 °C to +200 °C; metal bellows and coated systems: up to +400 °C .

• Speed: Most series support up to 10–20 m/s sliding velocity; balanced cartridges handle full industrial pump speeds .

• Shaft Diameters: From ~6 mm to 270 mm across series, matching both small submersibles and large process pumps
  
  
  

  Burgmann seals are trusted in:

   

  • Water and waste (BT/MG series)

  • Chemical and petrochemical (MG/HR series with corrosion-resistant faces)

  • Pulp & paper, mining, sugar (HR, HRKS)

  • Power, refinery (dual barrier Cartex)

  • Food/pharma (compact, hygienic, cartridge dual seals)

A carbon mechanical seal uses carbon-graphite material for the sealing face, typically paired with a harder counterface (like silicon carbide or tungsten carbide). This seal is designed to fit rotary equipment—such as pumps, compressors, and mixers—and prevent fluid or gas leakage at the shaft interface .

• Temperature Range: From cryogenic conditions to over 500 °F (≈260 °C); specialized grades handle even higher, up to 1150 °F in inert environments .

• Pressure & Wear Capability: Engineered to withstand high pressure and mechanical wear. Carbon-graphite materials are selected to endure thermal shock and adhesive or abrasive wear .

• Dry Running Tolerance: Self-lubrication enables safer operation when fluid lubrication is intermittent
  
  

   Advantages

   

  1. Chemical Compatibility – Resistant to broad fluid types including acids, solvents, and aggressive media .

  2. Low Friction & Energy Efficiency – Naturally lubricious, requiring less power to operate and generating less heat.

Carbon-segment seal rings—also called segmented carbon rings—are composed of high-purity carbon graphite, often reinforced with resins or metals. Instead of a single solid ring, the material is precision-machined into segments that interlock around a shaft, held together by springs (e.g., garter springs), creating a self-aligning, flexible, and sealed assembly .

These rings serve as the wear face in mechanical seals, matching against a counterface (metal, ceramic, or carbide). As the shaft rotates, the carbon's self-lubricating nature forms a microscopic graphite film on the mating surface, reducing friction and wear

1. Reliable sealing with low friction—graphite film reduces wear and energy loss.

2. Self-aligning segments maintain contact and accommodate shaft tilt or shift.

3. Efficient thermal management—conducts heat away from seal surface.

4. Dry-running capability—ideal in steam or vapor sealing where lubrication is limited.

5. Maintenance-friendly—individual segments can be replaced within a cartridge assembly without full system disassembly.
   
   
   

   Applications

    

   • Steam turbines, power plant shaft seal rings—high-temp, high-speed environments .

   • Compressors, fans, blowers, extractors—gas sealing where dry running is common .

   • Rotary steam joints, pump mechanical seals, agitators, autoclaves, and general process pumps handling various fluids

   • Hydro turbines, marine shaft seals, reciprocating compressors—supports pressure and alignment dynamics

A cartridge seal is a pre-assembled mechanical seal unit that contains all components: seal faces, springs, gland plate, and sleeve. It's designed as a single, removable module, making installation and servicing significantly easier compared to traditional component (packed) seals.

1. Ease of Installation & Removal – Pre-set at the factory; eliminates complex field alignment. Simply remove the gland bolts, slide off the old seal, fit the new cartridge, and bolt it in place.

2. Reduced Downtime & Error – Factory pre-setting ensures consistent performance and minimizes assembly errors or misalignment during maintenance.

3. Safer & Cleaner – Fully enclosed module prevents misplacement of small seal parts and reduces risk of leakage during seal fitting.

4. Performance Consistency – Hydraulic balancing reduces overhang load, allowing the seal to run cooler and more efficiently.

5. Serviceability – Easily testable on a bench; seal faces and elastomers changeable without disturbing piping or equipment.
   
   

   Cartridge seals are used extensively in:

    

   • Centrifugal pumps across industries (chemical, petrochemical, water treatment)

   • Process equipment like mixers, compressors, and reactors

   • Refurbishment kits for API-610 pumps (e.g. upgrading component seals)

   • Hazardous fluid handling when configurations like double/tandem seals are needed

Conical mechanical seals are a type of end-face mechanical seal used in rotating equipment such as pumps, mixers, and compressors. Their distinctive feature is the use of a conical or tapered spring that helps maintain axial pressure between the sealing faces. These seals are widely valued for their simplicity, compact design, and cost-effectiveness, particularly in light- to medium-duty industrial applications.

A conical mechanical seal consists of two main components: a rotating seal face (typically attached to the shaft) and a stationary seal face (mounted in the seal housing). These two faces are pressed together by a conical spring to prevent fluid leakage while allowing rotation. The conical spring provides the axial force needed to maintain contact between the faces, compensating for wear and vibration.

The taper of the spring offers some unique advantages. Unlike cylindrical springs, conical springs compress in a telescopic fashion, reducing the risk of buckling and allowing a more compact axial seal design. This makes conical seals particularly suitable where installation space is limited.

A mechanical seal is a precise sealing device installed where a rotating shaft exits a pump housing (e.g., centrifugal pumps, mixers, compressors) to prevent fluid leakage. It comprises two primary flat faces—one stationary, one rotating—that are pressed together to form a seal while the shaft turns.

Advantages:

• Minimizes leakage compared to packing seals, improving safety, efficiency, and environmental compliance.

• Reduces friction and wear by supporting hydrodynamic lubrication .

• Adaptable to a wide range of pressures, temperatures, chemicals, and shaft speeds.

• Meets stringent standards like API 682 for petrochemical and process industries
  
  
  

  Applications

  Mechanical seals are used in nearly every industry involving rotating equipment:

   

  • Chemical, Petrochemical, Oil & Gas – handling corrosive and hazardous fluids, high pressures, and tight emission control .

  • Water & Wastewater Treatment – pumps in harsh environments.

  • Food & Pharmaceuticals – sanitary designs to prevent contamination .

  • Power Generation – steam turbines and centrifugal compressors.

  • General Industrial – mixers, agitators, compressors, HVAC systems.

A clutch-type mechanical seal features an internal drive mechanism—typically a clutch ring or collar—that ensures the seal's rotating ring maintains precise rotational alignment with the shaft. The clutch allows torque transmission even if the central spring becomes clogged or partially disengaged, ensuring consistent seal face rotation and reliable operation

1. Installation: The clutch collar presses onto the seal head, keeping the rotary seal component aligned with the shaft.

2. Start-up: The spring applies axial load, loading the faces together. The clutch engages, locking rotary and housing parts together.

3. Operation: Shaft rotation spins the seal faces via clutch engagement. A thin fluid film (<10 µm) lubricates the faces, preventing direct contact and wear .

4. Clogging resilience: If spring force diminishes or dirt blocks spring seating, the clutch still enforces rotation, maintaining sealing while the fluid film manages face loading.
   
   
   

   Advantages

• Robust rotation, even with spring blockage

• Reliable torque transfer via integrated clutch

• Bi-directional operation—no directional limits
  

• Ideal for slurry or abrasive fluids thanks to blocked-spring tolerance

A mechanical seal is a precision-engineered device that prevents fluids from leaking where a rotating shaft exits a pump housing. It typically includes two flat sealing faces—one rotating and one stationary—that press together under a spring's force, with a microscopic fluid film separating them during operation . These seals are widely used in centrifugal pumps, including thermic fluid (hot‑oil) systems.

• During operation: Pump rotation creates a fluid film via hydrodynamic effect; spring pressure maintains precise film thickness (on the order of microns) between faces. This lubricates and cools the interface while preventing leakage .

• At rest: Spring pressure brings faces into contact, stopping fluid escape even when hydrodynamic pressure is absent .

A very small, controlled leakage is normal—it maintains cooling and lubrication—but vastly less than packing-based systems

For thermic fluid pumps, manufacturers offer seals rated to 300–350 °C (and even beyond). They use high-temperature materials—silicon carbide faces, Viton/PTFE secondary seals, stainless or alloy bellows, and robust spring assemblies . Often integrated in air‑cooled pump designs, these seals eliminate the need for external cooling
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With vast experience and knowledge we are involved in offering a premium quality range of Multi Spring Seal. These are well known in market due to their uniform face loading and reliability. These are easy to install and are used in different types of centrifugal pumps. Moreover, we also assure timely delivery of our products.

Features:

•Independent of direction of rotation
•Straight spring
•Inside mounted

Multiple Spring Types:

•Oil pump mechanical seal are available in balanced and unbalanced types
•They are independent of the direction of rotation. They are inherently balanced for pressure
•They are tough and rigid
•It can withstand high temperatures up to 500 degree Fahrenheit
•Shaft speed can go up to 3600 rpm
•Offered in single spring and multiple spring types. They are available at very cost effective prices

We offers a versatile and robust seal portfolio, ranging from standard ISC2 cartridge seals to specialized dual-gas, bellows, and spring-loaded gas barrier systems. Their seals support high-pressure, temperature extremes, corrosive fluids, dry-run resilience, and zero-emission requirements—all critical for modern industrial needs. 

• Design: Cartridge construction ensures rapid, error-free installation and easy in-shop testing—ideal for standardization and reduced downtime

A mechanical seal in Grundfos pumps—used widely in systems like CR, SE, Sarlin, CM, and submersibles—is an engineered barrier at the shaft to prevent fluid leakage and environmental ingress. It features two precision-mated faces (one rotating with the shaft, one stationary) pressed together by a spring and small fluid film (~0.00025 mm thick) to maintain sealing during operation

Grundfos provides various standard and specialist seals tailored to water, chemical, sewage, and thermal applications, with material pairings optimized for pressure, temperature, chemical compatibility, contamination, and viscosity

Low Leakage: Optimally flat seal faces riding on a thin lubricating film ensure minimal leakage when correctly installed

Contamination Resistance: External springs and bellows greatly reduce clogging in abrasive or dirty fluids

Modular Installation: Cartridge and semi-cartridge systems enable fast, field serviceable replacements without full pump teardown

Robust Performance: Proven reliability in water/wastewater, chemical, oil, HVAC, marine, pulp & paper industries .

The GU series mechanical seals from AESSEAL are high-quality, cartridge-style single-end seals tailored for Grundfos (B092GU) and Gorman‑Rupp (P02GU) pumps. They offer robust performance with TC/TC or SiC/SiC faces, a choice of NBR, EPR, or Viton elastomers, and stainless-steel hardware. With shaft sizes from 12 mm to 38 mm and polished cylindrical housing, they offer simple installation, resistance to wear and corrosion, and reliable operation in water and light chemical duty.

• Pump Manufacturers:

  • B092GU: Specifically designed for Grundfos pumps.

  • P02GU: Meant for Gorman‑Rupp pumps. .

• Usage: Ideal for water pumps, municipal systems, and light chemical services—especially in Grundfos and Gorman‑Rupp equipment.
  
  
  

   Operating Conditions

   

  • Pressure Rating: Suitable for typical pump applications (generally up to ~1.0 MPa), though exact rating may vary by seal variant.

  • Temperature Range: Compatible with standard elastomer temperature limits: NBR (up to ~110 °C), Viton (~200 °C), and EPR (~120 °C).

  • Shaft Speed: Designed for standard centrifugal pump speeds; typical up to ~10–15 m/s shaft surface speed.

  • Sealing Type: Balanced single-end cartridge seal—resilient yet compact design.

A bellows seal is a type of mechanical seal where a metal or elastomeric bellows replaces conventional springs. Its primary functions are to:

• Provide axial compliance—compensating for shaft misalignment or endplay

• Keep internal parts isolated from corrosive fluids like hydrochloric acid (HCl)

• Ensure dependable sealing in aggressive chemical services
  
  
  

  Applications & Suitability for HCl

   

  • Perfect for corrosive and toxic fluid handling, including dilute or concentrated HCl, due to PTFE or ceramic wetted parts .

  • Found in centrifugal and chemical pumps, mixers, and reactors used in chemical processing plants .

  • Proper elastomer and face material selection is crucial to avoid rapid corrosion or degradation—e.g., PTFE or Viton elastomers with SiC faces are recommended.
    
    
    

    Advantages

     

    • No exposed springs—critical for strong acid service

    • PTFE and ceramic wetted parts ensure broad chemical resistance

    • Self-aligning via bellows mechanism improves seal life

The CDSA™ is a cartridge-style double mechanical seal, ideally suited for hazardous or toxic fluids and high-stakes applications. Built around a modular design, it offers maximum configurability and quick installation—factory-assembled, pre-set, and pressure-tested to eliminate on-site adjustment errors .

A standout feature of CDSA™ seals is their self-aligning stationary faces, both inboard and outboard, balanced by a unique “universal joint” pivot that keeps faces square to the shaft under varying pressure and misalignment . Heavy-duty anti-rotation pins and spring-loaded internal rotary components further protect against pin shear or face clogging—especially in abrasive or slurry applications.

• Hazardous fluid containment: Its double/tandem configuration and barrier fluid enable safe handling of toxic or high-vapor applications in chemical, petrochemical, and pharmaceutical industries.

• Corrosion resistance: Exotic alloy options protect in aggressive chemical environments at minimal cost increase .

• Robust under solids: Spring-loaded design reduces clogging; anti-rotation pins maintain alignment under slurry conditions .

• Flexible customization: Face materials, elastomers, gland sizes, barrier systems, and exotic wetted parts make CDSA™ adaptable across a wide range of industrial specifications.

HE 912 mechanical seal,for blower pump. diving pump,circulating pump, replace the mechanical seal of Burgmann M6912

The HE Burgmann M6912 is a high-performance mechanical seal designed for use in pumps and rotating equipment operating under demanding industrial conditions. As part of the well-regarded EagleBurgmann product range, the M6912 is known for its robust design, balanced configuration, and suitability for a wide variety of fluids. Replacement seals for the M6912 are available from both original manufacturers and third-party aftermarket suppliers, offering similar performance at reduced costs.

The M6912 is a multi-spring, balanced mechanical seal with an inside-mounted configuration. It features independent direction of rotation, allowing it to be used on both clockwise and counter-clockwise rotating shafts. The seal’s balanced nature reduces face load, which in turn minimizes wear and extends service life, even under high-pressure conditions.

A key feature of the M6912 is its multiple spring design, which distributes axial forces evenly over the seal face, enhancing stability and ensuring consistent sealing performance. This configuration also improves the seal’s ability to handle shaft misalignment and vibration — a crucial factor in industrial pumping environments.

The HE MTN mechanical seal is a single-end cartridge seal built around solid SiC/SiC faces housed in polished stainless steel, currently designated for 40 mm shafts. It operates in typical industrial environments, including water and light chemical pumping, likely supporting pressures up to 10 bar and temperatures from –20 °C to +150 °C. Its cartridge configuration ensures quick, error-free installation and robust performance in non-abrasive duties. Available worldwide from Harini Engineering at approximately ₹4,000 per set.

• Primary Use: Industrial pump systems—general water, light chemical handling, non-abrasive fluid pumping.

The HE Multispring Mechanical Seal is a high-performance sealing solution designed to deliver reliable and consistent performance in demanding industrial applications. It is characterized by a balanced and compact design that employs multiple springs to provide uniform axial loading on the seal faces. This type of seal is particularly suitable for use in rotating equipment such as pumps, mixers, agitators, and compressors operating under moderate to high pressures and varying temperatures.

Applications

• Chemical Processing: Handles aggressive chemicals, solvents, and acids

• Petrochemical & Oil Refining: Resists hydrocarbons and high temperatures

• Water Treatment: Used in clean and wastewater pumps

• Pharmaceutical & Food Industries: Available with FDA-approved materials

• Pulp and Paper: Withstands fibrous slurry and high-speed operations

The HE120 is a polished, round stainless-steel mechanical seal produced by Harini Engineering in Tirupur, India, established in 2010 . It’s designed for industrial pump applications, offering durability and a refined finish at a unit price of ₹1,800–2,500 .

• Brand Name: HE120 (Harini Engineering)

• Condition: New and uninstalled

• Shape: Round cartridge or component-style seal

• Color: Silver metal housing with black elastomer elements

• Finishing: Polished stainless steel for corrosion resistance

The HE140 is an outside-mounted, dynamic-balanced mechanical seal commonly used in pumps and compressors where space within a stuffing box is limited. Its design ensures an enhanced lifespan, versatility in operating conditions, and suitability for aggressive fluids

The HE140 is a stainless-steel, outside-mounted, balanced mechanical seal, polished for corrosion resistance and industrial durability. It is available in various sizes to suit different shaft diameters. Withstanding pressures up to ~10–20 bar and temperatures in the range of –20 °C to +180 °C, it is suitable for many pump and compressor applications. However, specifics like exact diameters, shaft speed, sealing face materials, certifications, and warranty require direct inquiry with the manufacturer.

• Pressure rating: Vacuum to ~30 bar (700 mm Hg up to 30 bar)
  
  Shaft movement tolerance: ±1 mm in both axial and radial directions

The HE160 Mechanical Seal is a high-performance, balanced pusher-type seal designed for demanding industrial applications involving a variety of fluids under challenging operating conditions. As part of the HE series, the HE160 combines durability, versatility, and precise engineering to offer a dependable sealing solution for pumps, mixers, and other rotating equipment used across industries like chemical processing, petrochemical, water treatment, pulp and paper, food and beverage, and pharmaceuticals.

Constructed with superior-grade materials, the HE160 Mechanical Seal is known for its resistance to wear, corrosion, and high temperatures. The seal faces are commonly manufactured from premium Silicon Carbide (SiC), Tungsten Carbide (TC), or Resin-impregnated Carbon, depending on the application's specific fluid compatibility and operating parameters. These materials offer excellent surface hardness and low friction coefficients, allowing for extended service life even in abrasive or chemically aggressive media.

The secondary sealing components, such as O-rings or gaskets, are made from elastomers like Viton, EPDM, or Nitrile (NBR), offering resistance to a wide range of chemicals and temperature extremes. The metallic parts, typically SS304 or SS316 stainless steel, provide strength, corrosion resistance, and structural stability. This blend of materials makes the HE160 a go-to solution for both standard and hazardous fluid systems.

A key design feature of the HE160 is its balanced mechanical configuration, which reduces axial loading on the seal faces and minimizes distortion under pressure. This allows the seal to perform reliably at pressures of up to 20 bar and shaft speeds of up to 3600 RPM. The balanced nature also reduces heat generation, preventing premature wear and leakage. Additionally, the pusher design accommodates axial shaft movement and thermal expansion, ensuring continuous sealing performance even under fluctuating load and temperature conditions.

With a typical operating temperature range from -20°C to +180°C, the HE160 is well-suited for both chilled and high-temperature process environments. It is available in a range of shaft sizes, generally from 20 mm to 100 mm, and can be custom-adapted to suit specific equipment or installation needs. The seal’s modular structure and standard compliance (DIN 24960 / ISO 3069) ensure compatibility with most industrial pump types and ease of replacement.

Thanks to its rugged construction, the HE160 is especially suited for handling corrosive chemicals, light slurries, hydrocarbon-based fluids, water, and various organic compounds. It is often used in centrifugal pumps, end-suction pumps, and vertical in-line pumps where sealing integrity is critical to plant safety and uptime.

In practical terms, the HE160 Mechanical Seal is favored for its easy installation, low maintenance needs, and long operational life. It offers a significant return on investment by reducing downtime, leakage, and equipment wear caused by inferior sealing systems.

In summary, the HE160 Mechanical Seal stands out for its engineering precision, material resilience, and operational flexibility. Whether used in high-pressure chemical systems or general-purpose industrial pumps, it consistently delivers robust sealing performance, helping industries maintain safety, efficiency, and reliability in their fluid-handling operations.