DENMARK: Danfoss has upgraded its range of EVR solenoid valves, making them suitable for a broader range of applications.
From April 2018, the EVR v2 range will have replaced the EVR, EVRE and EVRH ranges. Danfoss says product rationalisation means fewer but more versatile models to suit more applications and refrigerants, while being backward compatible.
The EVR v2 valves are designed to accommodate higher refrigerant pressures while reducing servicing times. The rationalised range provides reduced running costs without compromising on reliability.
The Danfoss EVR range has been used for more than 30 years in a wide range of air conditioning and refrigeration applications such as walk-in cold rooms, display freezers and refrigerators, chillers, rooftops or close controls.
Higher maximum opening pressure differentials are said to deliver greater performance in high temperature applications (105°C) and are optimised for variable refrigerant flow conditions or use with variable speed technology.
They are designed for working pressure up to 45 bar, and are applicable to heat pumps or chillers running in ambient temperatures (up to 130°C in shorter for hot gas defrost and bypass) during periods of maximum loads.
The valves are approved for lower-GWP refrigerants, including R290 propane in commercial refrigeration units. Qualifications for use in larger chillers with mildly flammable and flammable refrigerants are planned in 2018.
In commercial refrigeration the valves are said to withstand the additional stress of rapid defrosting cycles and/or short hot gas injection cycles.
In food retail display cases they enable service and maintenance to be carried out quickly, with no disruption to store trading hours. There is no need to de-solder the complete valve as the internal parts can be replaced while the valve body is left in place. Service kits are also available.
The range is available for cooling capacity from 3 to 410kW in liquid line, 0.3 to 65kW in suction line and 1 to 350kW for hot gas bypass, with connection sizes from 6mm to 42mm. They have the same built-in length as the existing EVR with the corresponding connection size except for the bi-metal connections.