Knife Gate Valves Browse All 
Select a featured product type to jump to that section.
Unidirectional
Bidirectional
Urethane Lined
O-Port
Push-Through, Slurry Valves
Guided Shear Gate
Zero Pocket
HNBR (Hydrogenated Nitrile Butadiene Rubber) is a synthetic elastomer derived from NBR (nitrile rubber) through hydrogenation, which significantly improves its thermal, chemical, and mechanical properties. In valve applications, HNBR is commonly used for O-rings, seals, and seats where oil resistance, high-temperature stability, and durability are required—especially in oil & gas, automotive, and chemical processing environments.
Properties
- Improved Temperature Resistance – Operates reliably from -40°C to +150°C (-40°F to +302°F), outperforming standard NBR.
- Excellent Oil & Fuel Resistance – Suitable for hydrocarbons, lubricants, and sour gas, making it ideal for oilfield and refinery valves.
- Superior Mechanical Strength – High tensile strength, abrasion resistance, and tear resistance for dynamic sealing applications.
- Good Resistance to Heat & Oxidation – Enhanced longevity under thermal cycling and oxidative conditions.
- Resistant to Steam & Water – Performs well in hot water and low-pressure steam environments, where other elastomers degrade.
HNBR vs. Other Elastomers in Valve Applications
| Property | HNBR | NBR | FKM (Viton®) |
| Temperature Range | -40°C to +150°C | -30°C to +100°C | -15°C to +200°C |
| Oil & Fuel Resistance | Excellent | Good | Excellent |
| Chemical Resistance | Good | Moderate | Very Good |
| Abrasion Resistance | High | Moderate | Moderate |
| Cost | Moderate | Low | High |
Limitations
- Limited Compatibility with Strong Acids or Polar Solvents – Not suitable for ketones, esters, or chlorinated hydrocarbons.
- More Expensive Than NBR or EPDM – Due to its advanced formulation and performance characteristics.
- Lower Chemical Resistance Than FKM (Viton®) – For extreme chemical environments, FKM or FFKM may be preferred.
Common Applications
O-Rings & Seals – Used in control valves, actuators, and safety relief systems.
Seat Seals & Backup Rings – In ball and butterfly valves, especially in oil & gas and chemical plants.
Dynamic Shaft Seals – Where abrasion and high-pressure sealing are required.
Valve Stem Packing – In select applications requiring chemical and thermal durability.