Clarke Valve Shatters Benchmarks for Reliability and Fugitive Emissions Under ISO 15848-1:2015

dilating disk valve for chemical industry

Clarke Valve, a portfolio company of Saudi Aramco Energy Ventures, Chevron Technology Ventures, and OGCI Climate Investments, announced today that its proprietary Dilating Disk™ Valve has achieved another industry standard. During independent testing for ISO 15848-1:2015 certification, the Dilating Disk™ Valve completed the maximum certification level of 100,000 mechanical cycles and achieved the minimum allowable fugitive emissions.

Under ISO 15848-1, control valves must cycle from 40% open to 60% open, while meeting one of the tightness class ratings for methane leakage: tightness class CM signifies allowable leakage of ≤ 500 parts per million by volume (ppmv); BM is for ≤ 100 ppmv; and AM is the world’s most stringent standard for methane leakage, at ≤ 50 ppmv.

One of the other key ratings addressed by ISO 15848-1 is reliability, as measured by the endurance class that a control valve can surpass, while maintaining a CM tightness class or better: endurance class CC1 signifies 20,000 mechanical cycles completed; CC2 is for 60,000 mechanical cycles; and CC3 is the highest endurance threshold under ISO 15848-1, at 100,000 cycles.

“The Dilating Disk™ Valve has shattered the previously held standards for low emissions by a control valve, as expected,” said Kyle Daniels, President and CEO of Clarke Valve. “It achieved the ISO 15848-1 CC3 endurance rating for 100,000 mechanical cycles, while allowing a maximum of 2 ppmv, during more than 3 weeks of continuous testing. We have clearly demonstrated that we have the best fugitive emissions solution on the market, and we look forward to deploying this technology through the OGCI member companies.”

Owing to its unique design, the Dilating Disk™ Valve is one of the few control valves to qualify for both ISO 15848-1 and API 641 certification, as confirmed through independent testing by Yarmouth Research and Technology, LLC. API 641 is the American Petroleum Institute’s fugitive emissions standard for quarter-turn valves, which is the category of valve the Dilating Disk™ Valve belongs to, and is the most common category of valve in use today.

About Clarke Valve

Founded in 2011, Clarke Valve provides high quality industrial control valves to organizations worldwide. Using aerospace design principles, Clarke has developed the Dilating Disk™ Valve, the first major innovation in valve design in the last fifty years. The Dilating Disk™ Valve is the first control valve to achieve both API 641 and ISO 15848-1 certification, making it the world’s most compact, efficient, and environmentally responsible control valve. Clarke Valve technology is currently deployed in a diverse spectrum of markets, including oil and gas, aerospace, chemical, power plants, and water management.

For media inquiries, please contact Jason Alberti, Marketing Director, at