First Control Valve to Achieve API 641 Certification

218119a API 641 certified

Clarke Valve announces the API 641 certification of its proprietary Dilating Disk™ Valve design, the first control valve to achieve this certification of low fugitive-emission performance.

The API 641 standard applies to all stem seal materials and requires a stringent maximum allowable leakage of 100 parts per million by volume (PPMv). This API test standard calls for 610 cycles of the valve under extreme temperature fluctuations to evaluate emissions performance over an accelerated life cycle.

Fugitive emissions from legacy valve designs in industrial facilities are a major contributor to air pollution and global warming. Kyle Daniels, President & CEO said, “ Most people are unaware that 80% of refinery methane emissions come from traditional valve stems. Since the Dilating Disk™ Valve’s unique design provides a superior seal at the valve stem, it drastically reduces these emissions.”

The patented Dilating Disk™ Valve, by Clarke Valve, was independently tested by Yarmouth Research and Technology, LLC, who certified the valve passed testing with less than 20 PPMv of leakage, well below the 100 PPMv limit. “ We are excited to offer the only full-bore control valve in the world that eliminates virtually all fugitive emissions, ” said Daniels.

The Dilating Disk™ Valve’s distinct design, already the best performing control valve in the world, is now also the most environmentally friendly control valve ever certified.


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 patented Dilating Disk™ Valve, meeting the ASME B16.34, ASME B16.10 and ASME B16.5 international valve standards, as well as ISO 5211 standards for valve automation. Due to its best-in-class sealing system, the Dilating Disk™ Valve is the first control valve to achieve both API 641 and ISO 15848-1:2015 certifications, making it the world’s most compact, efficient, and environmentally friendly control valve. Clarke Valve technology can be easily scaled or customized to meet many challenging requirements, and is currently deployed in a diverse spectrum of markets, including oil and gas, aerospace, chemical, power plants, and water management. All Clarke Valves are 100% inspected and tested to FCI 70-2 standards for control valves. Clarke Valve is an OSHA-certified ISO 9001:2015 company with a rigid Quality Control process that places an emphasis on the safety of our products.