Home > Product > Ball Valve > Ball Valve Components & Materials > O-Rings (NBR, FKM, Silicone)
The O-ring is one of the most crucial sealing components in any ball valve. It ensures leak-proof operation, maintains pressure integrity, and protects the valve from external contamination and internal fluid leakage. At Perfect Engineers, we supply high-quality O-rings in NBR (Nitrile), FKM (Viton), and Silicone materials, each tailored for specific pressure, temperature, and media compatibility requirements.
Whether you’re working with oil, water, gas, food-grade liquids, or aggressive chemicals, choosing the right O-ring material guarantees long-term valve reliability and safety.
An O-ring is a circular elastomer seal placed around the stem, seats, or body joints of a ball valve to prevent internal or external leakage. It compresses under pressure to form a tight seal, adapting to movement, thermal changes, and vibrations.
O-rings are commonly used in:
| Material | Temp Range | Chemical Resistance | Best For |
| NBR (Nitrile) | -30°C to +120°C | Oil, gas, air, water | HVAC, fuel lines, general fluid systems |
| FKM (Viton) | -20°C to +200°C | Acids, fuels, solvents, hydrocarbons | Petrochemical, chemical, steam, fuel |
| Silicone | -60°C to +200°C | Water, food, air, inert gases | Pharma, food-grade, cleanroom, biotech |
| Industry / Application | Recommended O-Ring Material |
| HVAC & water distribution | NBR |
| Oil & gas pipelines | FKM (Viton) |
| Chemical reactors & dosing units | FKM or PTFE-encapsulated |
| Food & beverage piping systems | Silicone (FDA compliant) |
| Pharma, cosmetics, cleanrooms | Silicone or EPDM |
| LPG & fuel handling | NBR or Viton |
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Yes—FKM (Viton) offers superior chemical and temperature resistance, especially for acids, fuels, and solvents.
Yes—Silicone O-rings are FDA-compliant and safe for sterilization processes in pharma and food systems.
For static applications, they can last 5–10 years. In dynamic or high-cycle valves, inspect during major servicing.
Yes—we provide O-rings with backup rings, special groove designs, and graphite or PTFE alternatives for high-pressure services.
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