FKM and RTFE are two common sealing materials for valve seats. They have different characteristics in terms of chemical resistance, temperature range, etc., and are suitable for different working conditions.
FKM Valve Seat
- Chemical Resistance: FKM (fluororubber) has excellent chemical stability and can resist corrosion from a variety of chemicals, including oils, greases, fuels, many solvents, acids, and bases.
- Temperature Range: The temperature range of FKM is relatively wide, generally between -20°C and 200°C. Some special FKM formulations can withstand even higher temperatures.
- Application Range:
- Petroleum and chemical industry: Resistant to oil and solvents, suitable for valves transporting petroleum, natural gas, chemicals, and other media.
- Automotive industry: Used to manufacture oil-resistant and high-temperature resistant automotive seals.
- Mechanical equipment: Used as sealing elements for various mechanical equipment.
RTFE Valve Seat
- Chemical Resistance: RTFE (reinforced polytetrafluoroethylene) has extremely strong chemical inertness and is almost unaffected by any chemical substances. It is resistant to acids, bases, solvents, and oxidants.
- Temperature Range: The temperature range of RTFE is very wide, from -200°C to +260°C, and it can maintain good performance.
- Application Range:
- Semiconductor industry: Used in manufacturing valves for high-purity chemicals.
- Food and pharmaceutical industry: Suitable for valves that require hygiene and corrosion resistance.
- Chemical industry: Suitable for valves for corrosive media.
Comparison of FKM and RTFE
| Feature | FKM | RTFE |
| Chemical Resistance | Excellent, resistant to oil, solvents | Extremely strong, almost unaffected by corrosion |
| Temperature Range | -20°C to 200°C | -200°C to +260°C |
| Coefficient of Friction | Lower | Very low |
| Compression Deformation | Larger | Smaller |
| Cost | Lower | Higher |
Selection Recommendations
- Medium: If the medium is oil, grease, fuel, etc., and the temperature range is between -20°C and 200°C, FKM valve seat can be selected. If the medium is highly corrosive and the temperature range is wide, RTFE valve seat can be selected.
- Temperature: If the operating temperature is high, RTFE valve seat can be selected.
- Cost: If cost is a concern, FKM valve seat can be selected.
Note:
- The above is a general case. The specific selection should be made comprehensively considering the actual working conditions and the characteristics of the medium.
- The performance of FKM and RTFE produced by different manufacturers may vary slightly. Please carefully check the product specifications when selecting.
Summary
FKM and RTFE are two excellent valve sealing materials. By understanding their characteristics and application ranges, you can select the appropriate valve seat material according to different working conditions, thereby ensuring the long-term reliable operation of the valve.
If you need more detailed information, please provide the following information:
- Specific name and composition of the working medium
- Working temperature range
- Pressure
- Valve type
- Other special requirements
SHANDONG SHENG FEI Machinery CO., LTD is an outstanding China manufacturer. We will provide you with more professional advice based on your specific situation.