MG9 Elastomer Unitised Bellow Mechanical Seal |Replancement for EagleBurgmann MG9
The Formax MG9 is a compact elastomer bellows mechanical seal offered for selected EagleBurgmann MG9 replacement applications.
Its rotating bellows design operates independently of shaft rotation direction and is suitable for compatible water, wastewater, circulation and industrial pump duties.
Catalogued shaft diameters range from 10 to 100 mm. Installation dimensions, materials and operating conditions must be verified for each application.
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- Product Overview
The MG9 mechanical seal combines a rotating elastomer bellows with a spring-loaded face assembly. The bellows provides secondary sealing and axial flexibility to help maintain contact between the seal faces.
The unitised rotating assembly simplifies handling and installation. Conical or cylindrical spring configurations and installation lengths are selected to match the equipment requirements.
This page covers single-seal replacement selection. Tandem or back-to-back arrangements require separate specification of the seal chamber, operating pressures and supporting fluid system.
- Design Features
| Feature | Description |
|---|---|
| Seal Category | Elastomer bellows component seal |
| Bellows Design | Rotating elastomer bellows |
| Direction of Rotation | Independent of shaft rotation direction |
| Spring Configuration | Conical or cylindrical, depending on the selected assembly |
| Construction | Compact, unitised rotating assembly |
| Installation Length | Selected according to the dimensional drawing |
| Primary Arrangement | Single mechanical seal |
| Other Arrangements | Tandem or back-to-back configurations require separate review |
| Replacement Reference | Selected EagleBurgmann MG9 configurations, subject to verification |
- Operating Parameters
| Parameter | Specification |
|---|---|
| Product Model | Formax MG9 |
| Catalogued Shaft Diameters | 10–100 mm; selected sizes listed below |
| Maximum Operating Pressure | 12 bar / 1.2 MPa / approximately 174 psi |
| Operating Temperature | −20 to +140°C / −4 to +284°F |
| Maximum Sliding Velocity | 10 m/s / approximately 33 ft/s |
| Direction of Rotation | Bidirectional |
Operating limits depend on the seal size, material combination, fluid properties and installation conditions. Maximum pressure, temperature and sliding velocity must not be assumed to apply simultaneously. The full temperature range does not apply to every elastomer option.
- Material Options
| No. | Component | Catalogued Materials |
|---|---|---|
| 1 | Stationary Seat Cup | NBR, FKM/FPM, HNBR |
| 2 | Stationary Seat | Silicon carbide, aluminium oxide ceramic, cemented carbide |
| 3 | Rotating Seal Face | Carbon graphite, silicon carbide, cemented carbide |
| 4 | Retaining Ring | Stainless steel 304 or 316 |
| 5 | Elastomer Bellows | NBR, FKM/FPM, HNBR |
| 6 | Retainer | Stainless steel 304 or 316 |
| 7 | Snap Ring | Stainless steel 304 or 316 |
| 8 | Spring | Stainless steel 304 or 316 |
Select materials according to fluid chemistry, concentration, temperature, lubrication and solids content. Component names and numbering must correspond to the final assembly drawing.
EPDM elastomers and tungsten carbide faces require confirmation for the selected configuration.
- Dimensions & Size Selection
The dimensional table covers selected shaft diameters from 10 to 100 mm. Compare the complete installation dimensions with the existing seal and equipment drawing before ordering. Shaft diameter alone does not establish replacement compatibility.
All dimensions are in millimetres. d1 is the shaft diameter and L1 is the installed working height. Read the remaining dimension symbols together with the corresponding seal drawing.
| d1 | d2 | d3 | d4 | d5 | L1 | L2 | L3 | L4 |
|---|---|---|---|---|---|---|---|---|
| 10 | 17 | 21 | 13 | 19.6 | 32.5 | 6.6 | 1.5 | 4 |
| 12 | 19 | 23 | 15 | 21.6 | 32.5 | 6.6 | 1.5 | 4 |
| 14 | 21 | 25 | 18 | 24 | 35 | 6.6 | 1.5 | 4 |
| 15 | — | — | 19 | 25 | — | — | — | — |
| 16 | 23 | 27 | 20 | 26.5 | 35 | 6.6 | 1.5 | 4 |
| 18 | 27 | 33 | 22 | 29 | 37.5 | 7.5 | 2 | 5 |
| 20 | 29 | 35 | 24.5 | 31.5 | 37.5 | 7.5 | 2 | 5 |
| 22 | 31 | 37 | 27 | 33 | 37.5 | 7.5 | 2 | 5 |
| 24 | 33 | 39 | 29 | 37 | 40 | 7.5 | 2 | 5 |
| 25 | 34 | 40 | 30 | 38 | 40 | 7.5 | 2 | 5 |
| 28 | 37 | 43 | 34 | 41 | 42.5 | 7.5 | 2 | 5 |
| 30 | 39 | 45 | 36 | 43 | 42.5 | 7.5 | 2 | 5 |
| 32 | 42 | 48 | 38 | 45 | 42.5 | 7.5 | 2 | 5 |
| 33 | 42 | 48 | 39 | 46 | 42.5 | 7.5 | 2 | 5 |
| 35 | 44 | 50 | 41 | 48 | 42.5 | 7.5 | 2 | 5 |
| 38 | 49 | 56 | 44.5 | 52.5 | 45 | 9 | 2 | 6 |
| 40 | 51 | 58 | 47.5 | 55.5 | 45 | 9 | 2 | 6 |
| 43 | 54 | 61 | 50.5 | 58.5 | 45 | 9 | 2 | 6 |
| 45 | 56 | 63 | 52.5 | 60.5 | 45 | 9 | 2 | 6 |
| 48 | 59 | 66 | 56 | 64 | 45 | 9 | 2 | 6 |
| 50 | 62 | 70 | 58 | 66 | 47.5 | 9.5 | 2.5 | 6 |
| 53 | 65 | 73 | 61 | 69 | 47.5 | 11 | 2.5 | 6 |
| 55 | 67 | 75 | 63 | 71 | 47.5 | 11 | 2.5 | 6 |
| 58 | 70 | 78 | 66 | 76 | 52.5 | 11 | 2.5 | 6 |
| 60 | 72 | 80 | 68 | 78 | 52.5 | 11 | 2.5 | 6 |
| 63 | 75 | 83 | 71.5 | 82 | 52.5 | 11 | 2.5 | 6 |
| 65 | 77 | 85 | 73.5 | 84 | 52.5 | 11 | 2.5 | 6 |
| 68 | 81 | 90 | 76.5 | 87 | 52.5 | 11.3 | 2.5 | 7 |
| 70 | 83 | 92 | 79 | 89 | 60 | 11.3 | 2.5 | 7 |
| 75 | 88 | 97 | 85 | 95 | 60 | 11.3 | 2.5 | 7 |
| 80 | 95 | 105 | 91.5 | 101.5 | 60 | 12 | 3 | 7 |
| 85 | 100 | 110 | 97 | 107 | 60 | 14 | 3 | 7 |
| 90 | 105 | 115 | 103 | 111.5 | 65 | 14 | 3 | 7 |
| 95 | 110 | 120 | 103 | 117.5 | 65 | 14 | 3 | 7 |
| 100 | 115 | 125 | 106 | 122.5 | 65 | 14 | 3 | 7 |
“—” indicates that the dimension is not provided in the source table. Dimensions are catalogue reference values, not an approved manufacturing drawing. Confirm missing values, tolerances and the final assembly drawing before ordering.
- Typical Applications
| Application | Typical Equipment |
|---|---|
| Water Supply | Water pumps and compatible pipeline pumps |
| Water Circulation | Circulating pumps and cooling-fluid pumps |
| Wastewater Treatment | Suitable wastewater and submersible pumps |
| Chemical Processing | Compatible chemical transfer and process pumps |
| Pulp and Paper | Suitable circulation and process pump duties |
| Multistage Pump Service | Compatible non-drive-side seal positions |
| General Industrial Service | Suitable oil and other liquid-handling equipment |
Pump type alone does not establish suitability. Review the seal chamber dimensions, fluid properties and operating conditions for each installation.
Food, beverage and pharmaceutical applications require separate verification of wetted materials and any applicable hygiene or material documentation requirements.
- Media Compatibility
The MG9 may be considered for water, selected wastewater streams, cooling fluids, oils and other compatible low-solids liquids.
Chemical solutions, biodiesel-related fluids and mildly corrosive media require a review of fluid composition, concentration, temperature and material compatibility. Pulp-containing or abrasive fluids require an assessment of solids content and particle characteristics.
No single face pairing or elastomer is suitable for all listed media.
- EagleBurgmann MG9 Replacement Compatibility
The Formax MG9 is offered for selected EagleBurgmann MG9 replacement applications. Confirm the installation dimensions, face pairing, elastomer specification and operating duty before ordering.
A matching model designation or shaft diameter does not establish interchangeability. The stationary seat design, installed working height, spring configuration and seal arrangement must also match the equipment requirements.
| Compatibility Check | Information Required |
|---|---|
| Existing Seal | Manufacturer, complete designation and material codes |
| Shaft or Sleeve | Diameter and relevant installation dimensions |
| Stationary Seat | Outside diameter, thickness and mounting arrangement |
| Rotating Assembly | Outside diameter and installed working height |
| Spring Configuration | Conical or cylindrical, as fitted |
| Seal Arrangement | Single, tandem or back-to-back |
| Operating Conditions | Fluid, pressure, temperature and shaft speed |
| Order Requirements | Quantity and required delivery date |
For vacuum service, provide the absolute operating pressure, pressure direction and stationary seat retention details for a separate review.
Frequently Asked Questions
| Question | Answer |
|---|---|
| Is the MG9 seal bidirectional? | Yes. The specified elastomer bellows design operates independently of shaft rotation direction. |
| What shaft sizes are listed? | The dimensional table includes selected shaft diameters from 10 to 100 mm. Complete dimensions for the 15 mm version require confirmation. |
| Can it replace every EagleBurgmann MG9 seal? | Compatibility must be checked for the exact dimensions, materials, arrangement and operating conditions. |
| Can MG9 be used in a dual-seal arrangement? | Tandem or back-to-back arrangements may be considered, but require separate specification of the installation and supporting fluid system. |
| What are the operating limits? | The HJMG9 supplier information lists up to 12 bar, −20 to +140°C and a sliding velocity of up to 10 m/s. Actual limits depend on the selected configuration and duty. |
| What is needed for a quotation? | Provide the existing seal designation, installation dimensions, operating conditions and quantity. Include drawings or measured photographs where available. |
- Request a Quote
Need an MG9 replacement seal? Send your existing seal designation, installation dimensions, operating conditions and required quantity to Formax Fluid for configuration review and quotation.
