Based on tests performed in the Honeywell lab*, CAREL valves have been shown to provide complete compatibility for operation with hydrofluoro-olefin refrigerants, more commonly known as HFOs, with specific reference to types R1234ze and R1234ze.
HFO refrigerants are universally recognised as the next generation refrigerants, due to their features of high environmental compatibility, competitive costs and very high energy efficiency.
Initially developed to respond to the specifications of European directive 2006/40/EC, which required vehicle air-conditioners to use refrigerants with GWP<150, they have gradually been taken up with good results in HVAC applications, and are now considered the most promising refrigerants for all high-efficiency solutions with a low environmental impact.
The validation tests conducted on CAREL valves showed how all of the mechanical components are fully chemical compatible, while the sealing mechanisms – the most critical components in preventing refrigerant leaks in the circuit (ensuring tightness to the surrounding environment – obtained excellent results in terms of dimensional stability.) This aspect is important on the CAREL ExV valves, as exceptional tightness on closing is one of the determining and distinctive features of these products (tightness against internal leaks).