Grundfos Pump Seals: MG13 Rubber Bellow style
Grundfos Pump Seals: MG13 Rubber Bellow style
The MG13 is a single-spring, elastomer bellows mechanical seal. It belongs to the standard "MG" seal family (compatible with EagleBurgmann MG13 dimensions).
| Shaft Size (mm) |
Rotary Outer Diameter |
Stationary Outer Diameter |
Rotary Working Length |
Stationary Working Length |
Total Working Length |
| 28 | 49.0 | 43.0 | 42.5 | 7.5 | 50.0 |
| 38 | 59.0 | 56.0 | 46.0 | 9.0 | 55.0 |
| 48 | 70.5 | 66.0 | 51.0 | 9.0 | 60.0 |
| 55 | 81.0 | 75.0 | 59.0 | 11.0 | 70.0 |
| 60 | 88.5 | 80.0 | 59.0 | 11.0 | 70.0 |
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Extended Bellows Tail: The MG13 shares the same inner diameter and seal face profiles as the MG1 and MG12, but features an elongated rubber bellows section (L1K mounting length according to DIN EN 12756 / ISO 3069).
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Non-Galling / Shaft Protection: The rubber bellows grips the shaft directly to drive rotation without set screws, protecting the pump shaft or shaft sleeve from fretting and wear.
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Self-Cleaning Design: The dynamic single coil spring is non-clogging, making it suitable for media containing small particulates or solids.
1. Rotary & Stationary Faces
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Carbon Graphite vs. Silicon Carbide (CAR/SIC): Recommended for clean water, hot water circulating, and general industrial duties. Excellent dry-run protection and low friction.
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Silicon Carbide vs. Silicon Carbide (SIC/SIC): Recommended for raw water, river water, wastewater, or media containing abrasive particles (sand, grit, scale).
2. Elastomer (Rubber Bellows & O-Rings)
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EPDM (Ethylene Propylene): Best Choice for Hot & Cold Water. Excellent for glycol mixtures, hot water heating circuits, and mild washdown chemicals up to 120°C. (Do not use with oils or hydrocarbons).
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NBR (Nitrile): Ideal for cold water, oils, fuels, and standard municipal wastewater up to 90°C.
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FKM / Viton: Recommended for higher temperature fluids (up to 180°C/200°C), oils, and mild chemical duties.
3. Metal Components & Spring
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SS304 Stainless Steel.