Zero-Leak Valve Design
Figure
4 : 1 / 2 NPS , 1 NPS and 2 NPS class 1500 valves on trial with gaseous hydrogen . External magnetic coupling removed from 2 NPS valve to reveal stemless design . Actuated by low torque electric actuators traditionally employed on HVAC systems . be tolerated . Although the mechanism is designed to be robust , we are initially looking to deploy into relatively clean service . These are compromises , but ones we think are acceptable . Perhaps the biggest compromise that you might be expecting with the Dragonfly valve is price . While we can make some strong arguments for the total cost of ownership improvements a stemless valve can provide , purchase price is ultimately still a big driving factor in valve selection . A magnetic coupling is more expensive than a mechanical stem , but when considering the Dragonfly valve as an actuated package or as a ball valve that can replace a much larger globe valve , the Dragonfly valve can be very competitive . The 10x torque amplification of the Dragonfly mechanism not only enables the use of magnetic couplings , but also means the actuator can be 10x smaller . This can represent a significant cost saving or allow electrification where previously a costly pneumatic supply system would be required . For example , a lower torque , fast electric actuator can now be used , where previously a pneumatic actuator would be required for a control application . Similarly , the high flow capacity of the Dragonfly
valve ’ s eccentric ball design means that a much smaller valve can be used to meet the same flow requirements . For example , where previously a larger globe valve would have been used because of the need to employ a bellows seal , ensuring toxic chemicals stay in the pipe , a smaller and thus cheaper Dragonfly valve can now be employed .
Dragonfly valve – State of development
The Dragonfly valve has been in development for the last 2 years , with a focus on development for gaseous hydrogen applications , with funding from the UK Department for Energy Security and Net Zero . A range of valve sizes have been produced from 3 / 8 NPS ( DN 10 ) to 4 NPS ( DN 100 ), and pressures up to class 2500 ( PN 400 ). Valves have undergone witnessed testing with Score Group and LRQA . The valve is actively being trialled with hydrogen ( Figure 4 ) and ammonia , with natural gas trials to begin in 2025 . A cryogenic version of the Dragonfly valve is also in development . The Dragonfly valve is officially launching at Valve World Düsseldorf 2024 , come and find us in Hall 1 , Stand E32 ( next to the BVAA stand ).
vtork . cn
1 . Enhanced Operational Efficiency Improved Accuracy Predictive Maintenance
2 . Cost Savings Reduced Labor Costs Longevity of Equipment
3 . Safety and Compliance Minimized Human Exposure Accurate Reporting Environmental Protection