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Vedação Mecânica Estilo Tipo 21
Vedações mecânicas estilo Tipo 21 para bombas de água, sistemas de HVAC e circulação industrial. Foles em NBR, EPDM e FKM com opções de face em carbono, cerâmica e SiC.
- Tamanhos, materiais e perfis personalizados disponíveis
- Desempenho de vedação confiável em condições exigentes
- Embalagem e documentos prontos para exportação
1. General Specifications
| Parameter | Specification |
|---|---|
| Product Name | Type 21 Style Mechanical Seal |
| Product Type | General-Purpose Elastomer Bellows Seal |
| Seal Design | Type 21 Style / Single Spring |
| Seal Arrangement | Single Mechanical Seal |
| Construction | Elastomer Bellows / Non-Pusher |
| Seal Face Materials | Carbon Graphite / Ceramic / Silicon Carbide / Tungsten Carbide |
| Elastomer Materials | NBR / EPDM / FKM |
| Metal Components | Stainless Steel Options |
| Reference Temperature Range | -40°C to +205°C (Material Dependent) |
| Reference Operating Pressure | Up to 10 bar |
| Reference Sliding Velocity | Up to 13 m/s |
| Spring Type | Single-Coil Spring |
| Shaft Motion | Rotary |
| Shaft Sizes | Standard and Replacement Dimensions |
| Stationary Seat | Various Matching Seat Options |
| Applications | Water Pumps / HVAC / Circulation Pumps / Industrial Equipment |
| Customization | Dimensions / Elastomer / Seal Face Combination |
| MOQ | Flexible |
2. Seal Face Material Options
| Face Combination | Main Characteristics | Typical Applications |
|---|---|---|
| Carbon / Ceramic | Economical, established sealing combination for suitable clean liquids | Water Pumps / Circulation Systems |
| Carbon / Silicon Carbide | Good sliding performance and improved wear resistance | Industrial Pumps / Process Equipment |
| Carbon / Tungsten Carbide | Strong mating surface with good abrasion resistance | Selected Industrial Pump Applications |
| Silicon Carbide / Silicon Carbide | High hardness and chemical resistance with proper lubrication | Chemical Processing / Demanding Fluids |
3. Elastomer Material Options
| Material | Main Characteristics | Typical Applications |
|---|---|---|
| NBR | Good resistance to mineral oils and lubricants | General Industrial Pumps / Oil-Compatible Media |
| EPDM | Good resistance to water and selected aqueous media; generally unsuitable for petroleum oils | Water Circulation / Industrial Utilities |
| FKM | Good resistance to elevated temperatures and many oils and chemicals | Industrial Process Pumps / Elevated-Temperature Service |
Type 21 Style Mechanical Seals are general-purpose elastomer bellows seals designed for centrifugal pumps, rotary pumps and other industrial rotating equipment. They feature a flexible rubber bellows, a single-coil spring and a rotating seal face working against a stationary mating seat.
The compact design provides reliable sealing for suitable water-based fluids, lubricating liquids and general industrial pump applications. The elastomer bellows helps accommodate limited shaft movement, seal face wear and equipment tolerances while maintaining secondary sealing.
Type 21 style seals are widely used in industrial pump maintenance and aftermarket replacement applications.
Features & Advantages
Compact Elastomer Bellows Design: Suitable for a wide range of general industrial pump applications.
Single-Coil Spring: Provides axial closing force to maintain seal face contact.
Automatic Wear Compensation: Flexible bellows construction accommodates gradual sealing face wear.
Non-Pusher Construction: Reduces the need for a sliding secondary seal along the shaft.
Multiple Face Materials: Carbon, ceramic, silicon carbide and tungsten carbide combinations are available for different operating fluids.
Material Options: NBR, EPDM and FKM bellows materials can be selected according to fluid and temperature requirements.
Replacement Compatibility: Various sizes and stationary seat designs can be sourced for existing pump installations.
Materials & Construction
Type 21 style mechanical seals typically consist of an elastomer bellows, rotating seal face, single-coil spring, drive components and stationary mating seat.
Carbon graphite is commonly used as a rotating sealing face material, while ceramic, silicon carbide or tungsten carbide may be used as mating surfaces.
NBR is commonly selected for oil-compatible applications, EPDM for suitable water-based fluids and FKM for selected elevated-temperature or chemical applications.
The final material combination should be selected according to the working medium, temperature, pressure and operating speed.
Typical Applications
Centrifugal water pumps
Industrial circulation pumps
HVAC and cooling systems
Water and wastewater treatment equipment
General industrial process pumps
Selected refrigeration and chiller equipment
Pump repair and maintenance applications
Standard & Replacement Supply
CORA SEALS supplies Type 21 style mechanical seals in various sizes, elastomer compounds and sealing face combinations for pump manufacturers, maintenance contractors and industrial distributors.
Replacement seals can be sourced according to shaft diameter, spring assembly dimensions, stationary seat dimensions and existing samples.
For quotations, please provide the shaft diameter, complete seal dimensions, seat type, preferred materials and required quantity.
Pump model numbers, technical drawings or photos of the original seal can help verify dimensional compatibility before ordering.
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