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How Temperature Affects Butterfly Valve Seals
Temperature is the most critical factor affecting butterfly valve seal life. Choose the wrong seat material, and your valve will leak—whether from heat-induced compression set or cold-temperature embrittlement.
At Kinko, we engineer seats for every thermal environment. This guide helps you match seat material to your operating temperature.
Seat Material Temperature Limits
| Material | Temperature Range | Best For | Avoid |
|---|---|---|---|
| EPDM | -40°C to +120°C | Water, wastewater, HVAC | Oils, fuels, steam |
| NBR | -30°C to +100°C | Oils, diesel, fuels | Hot water, outdoor UV |
| Viton (FKM) | -20°C to +200°C | Acids, solvents, high heat | Low temperatures (<-20°C) |
| PTFE | -40°C to +230°C | Chemicals, steam, cryogenic | Low-pressure sealing (<3 bar) |
| Silicone | -60°C to +200°C | Extreme cold, food contact | Oils, high-pressure |
Key Temperature Effects
| Effect | Cause | Result |
|---|---|---|
| Compression set | Prolonged heat | Permanent deformation → leakage |
| Embrittlement | Extreme cold | Cracking → catastrophic failure |
| Hardening | Heat aging | High torque → actuator oversizing |
| Softening | Excessive heat | Reduced pressure rating |
Temperature Derating Factors (PN16 Valve)
| Temperature | EPDM | NBR | Viton | PTFE |
|---|---|---|---|---|
| -40°C to 0°C | 0.9x | 0.8x | 0.7x | 1.0x |
| 0°C to 80°C | 1.0x | 1.0x | 1.0x | 1.0x |
| 80°C to 120°C | 0.6x | Not allowed | 0.9x | 1.0x |
| 120°C to 200°C | Not allowed | Not allowed | 0.6x | 0.8x |
Quick Selection by Application
| Your Application | Recommended Seat |
|---|---|
| Hot / cold water (HVAC) | EPDM |
| Outdoor freeze-thaw | EPDM or Silicone |
| Diesel / oil transfer | NBR |
| High-temperature chemicals (150°C+) | Viton or PTFE |
| Steam / CIP sterilization | PTFE |
| Cryogenic (-196°C) | Special cryogenic seat |
| Food / potable water | EPDM (FDA grade) |
Signs of Temperature Failure
| Symptom | Problem |
|---|---|
| Leakage at low pressure | Compression set (too hot) |
| Cracks in seat | Too cold (embrittlement) |
| Stiff operation | Heat hardening |
| Melted / charred seat | Extreme overtemperature |
Conclusion
Match your seat material to your maximum and minimum operating temperatures—plus any excursion spikes. Kinko offers EPDM, NBR, Viton, PTFE, and Silicone seats across all valve series.
Need a seat recommendation? Contact Kinko with your media, temperature, and pressure for a free compatibility review.
Internal Keywords: butterfly valve seat temperature, EPDM vs Viton, PTFE seat high temperature, Kinko seat chart
Ivan (Mobile:+86-18968769287)
WhatsApp：+86-13579991606
Wechat:+86-18968769287
Website：www.kinko-flow.com
ZHEJIANG KINKO FLUID EQUIPMENT CO.,LTD
info@kinko-flow.com
+86-133 5611 9006
