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O-rings for Gas Sweetening Valves

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Ball valves are one the most common type of industrial valves used today. They use a rotating ball containing a hole that allows straight-through flow in the open position and shuts off flow passage when the ball is rotated 90 degrees. The valve is used for on/off and throttling services. These valves are used in a wide variety of industries including oil and gas, chemical processing, power generation and pump and paper among others.






The Challenge
One challenging application for Trunnion mounted ball valves is in gas cleaning/sweetening processes where acid gases such as hydrogen sulfide and carbon dioxide are separated from feed gas streams such as synthesis gas produced by gasification of coal, coke, or heavy hydrocarbon oils. Some of these gas sweetening processes operate under an acid gas removal glycol-based solvent. Gas sweetening is a common unit process used in refineries, petrochemical plants, natural gas processing plants and other industries

The Solution
DuPont™ Kalrez® 7090 perfluoroelastomer parts offer an excellent combination of chemical, RGD resistance, and high temperature resistance for O-ring applications in these types of valves handling glycol-based solvent. The use of Kalrez® parts and components may extend the MTBR (Mean Time Between Repairs) of the valves and reduce leakage which can help contribute to reduced maintenance costs. The latest Kalrez® 0090 parts represent another option for this application when better RGD resistance and improved chemical resistance to water and hydrogen sulfide (H2S) is needed for temperatures that do not exceed 250 °C (482 °F).



Standard Kalrez® O-Ring Compounds

Daemar DMR O-Rings Kalrez

Kalrez® Compounds – 4079

4079 perfluoroelastomer parts are a black, low compression set product for use in many dry and wet semiconductor process environments. It has excellent chemical resistance, good mechanical properties and outstanding thermal stability.


Kalrez® Compounds – 6375

6375 is designed to give outstanding performance in the widest possible range of chemicals and temperatures. This product is an excellent choice for use in acids, bases, amines, steam, ethylene oxide, and many other aggressive chemicals.


Kalrez® Compounds – 7075

7075 is designed for general-purpose use as O-rings or custom sealing components in the chemical and hydrocarbon processing industries. It is a carbon black-filled compound with mechanical properties designed for improved sealing performance in temperature cycling applications. 7075 has improved thermal resistance that extends maximum service temperature to 327 °C (620 F).


Kalrez® Compounds – 0090

0090 perfluoroelastomer parts deliver durable, reliable sealing solutions for applications requiring excellent rapid gas decompression (RGD) properties as well as high hardness and high modulus properties. Some application areas include downhole equipment such as drilling and completion tools as well as industrial equipment including pumps and valves.

Specialty Kalrez® O-Ring Compounds


Kalrez® Spectrum™ – 7375

Kalrez® Spectrum™ 7375 perfluoroelastomer parts are an innovative FFKM product based on a patented crosslinking system for chemical process industry applications where broad chemical and water/steam resistance are needed at elevated temperatures. Kalrez® Spectrum™ 7375 parts exhibit excellent compression set resistance, outstanding physical property retention, and good mechanical strength properties.


Kalrez® Compounds -6380

6380 is a non-black product specifically developed for chemical processes involving hot, aggressive amines. It has also been successfully used in applications involving highly oxidizing chemicals. In addition, it has excellent overall chemical resistance. This cream colored product is easily identifiable when selecting an O-ring material for harsh chemical plant services.


Kalrez® Compounds -7090

7090 is a product for uses requiring higher hardness/higher modulus than more typical applications. Kalrez® 7090 perfluoroelastomer parts are well suited for both static and dynamic applications as well as specific sealing applications requiring extrusion resistance at high temperatures.


Kalrez® Compounds -0040

0040 -is a black product specifically designed for low temperature environments where significant chemical resistance is required. Kalrez® 0040 parts maintain elasticity and seal force at temperatures unattainable by other perfluoroelastomers.




Kalrez® Compound – W240

Kalrez® W240 perfluoroelastomer parts are a black product for photovoltaic wet manufacturing processes requiring a wide range of chemical resistance. W240 provides an excellent combination of properties (resistance to acids/bases) and is the product of choice for wet processes as an upgrade from standard elastomers, i.e., FKM, NBR, EPDM, etc.




Kalrez® is a registered trademark of E.I. du Pont de Nemours and Company or its affiliates












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