MG9 Rubber Bellows Pump Seal
The MG9 Rubber Bellows Pump Seal offers reliable performance for various industrial pumping applications with its innovative design and material flexibility.
Core Configuration Selection Recommendations
Bellows Material - The Core Factor Determining Seal Life
The performance of the MG9 seal is highly dependent on the elastomer compound. Selection must be based on fluid compatibility and temperature requirements.
| Material Option |
Optimal Service Conditions |
Media to Avoid |
Procurement Consideration |
| Nitrile Rubber (NBR) |
Cost-sensitive applications with water, oils, greases at temperatures ≤ 80°C |
Ozone, ketones, esters, strong oxidizing agents |
The economical choice for standard water and oil services |
| Ethylene Propylene Diene Monomer (EPDM) |
Hot water, steam, alkaline solutions, cold water, low-pressure steam at temperatures ≤ 120°C |
Mineral oils, greases, most hydrocarbon solvents |
Primary choice for hot water/steam duties, offers excellent aging resistance |
| Fluoroelastomer (FKM/Viton®) |
Broad range of chemicals, oils, high-temperature media. Good temperature resistance up to ~180°C (varies by grade) |
Hot water/steam (risk of hydrolysis), ketones, ammonia |
General-purpose chemical resistance. Strong overall performance, a common industrial standard |
Procurement Advice: Never order by the base model "MG9" alone. The material suffix code is critical. Always specify the full compound designation, e.g., MG9-EPDM or MG9-FKM.
Seal Face Combination - Influencing Wear Resistance & Heat Dissipation
Standard & Cost-Effective
Silicon Carbide (SiC) / Resin-Impregnated Carbon-Graphite
Suitable for the vast majority of applications with clean fluids (water, chemicals without hard particles). This is the most cost-effective procurement option.
Enhanced Wear-Resistant
Silicon Carbide (SiC) / Silicon Carbide (SiC)
Recommended for media containing fine suspended solids (e.g., cooling tower water, water with slight impurities). This pairing significantly extends service life. Although the initial procurement cost is higher, the Total Cost of Ownership (TCO) may be lower due to reduced downtime and replacement frequency.
Key Features
For plain shafts
Single and dual seal configurations
Elastomer bellows rotating design
Unbalanced construction
Independent of direction of rotation
No torsion on bellows and spring
Conical or cylindrical spring options
Metric and inch sizes available
Special seat dimensions available
US Patent No. 6.220.601
Operating Limits
| Shaft diameter |
10~100mm |
| Pressure |
up to 1.2Mpa |
| Temperature |
-20~140°C |
| Sliding velocity |
10m/s |
Material Specifications
| Component |
Available Materials |
| Rotary Ring |
Carbon / SiC / TC / Ceramic |
| O-Ring |
EPDM, NBR, AFLAS, Kalrez, PTFE |
| Spring and Metal Parts |
SUS304, SUS316 |
| Stationary Ring |
Carbon / SiC / TC / Ceramic |
Performance Advantages
Spring unit averted from product to prevent sticking and clogging
Safe operation with seal face locking by square pin
Suitable for pressure reversals
Operation in vacuum without additional seat locking
No shaft damage from dynamically loaded O-Ring
Compact installation sizes
Ideal for conversions without pump adaptations
Insensitive to solid-containing and abrasive media
Benefits of balanced seal performance with plain shafts
Insensitive to shaft movements due to stationary design
Application Areas
- General Industrial Water Pumps: For sealing clean water, cooling water, and low-pressure hot water in standard centrifugal pumps
- Chemical Process Pumps (Mild Services): Suitable for handling mild alkaline solutions, certain diluted acids, and solvents where the rubber material is chemically compatible
- HVAC and Circulation Pumps: Used in heating, ventilation, air conditioning, and hot water circulation systems
- Irrigation and Agricultural Water Pumps: Applied in pumps for transferring river water, lake water, or treated wastewater
- Marine and Shipboard Pumps: Used for general sea water (with compatible material selection), ballast, and bilge pumping duties
Shipping & Payment Terms
Port of Loading: Shanghai
Shipping Method: DHL, UPS, FEDEX, TNT, etc
Payment Terms: T/T, Western Union, MoneyGram
Custom Services
- OEM/ODM orders available from our factory
- Accept customized mechanical seals according to your drawings or requirements
- Small quantity orders accepted
- Provides excellent quality with competitive pricing
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