The standard 2-port valves VVF21, VVF31 and VVF40 and standard 3-port valves VXF21, VXF31 and VXF40 with flanged connections and linear actuators for closed circuits and pressure classes PN 6, PN 10 and PN 16 plus nominal sizes DN 15 through DN 150 have proven their worth in heating, ventilation and air conditioning (HVAC) plant and for heat generation and heat distribution. Using hydraulic simulation, Siemens engineers precisely determined the flow conditions at extremely high flow velocities and pressures representing 160 m water column to find the best flow path geometry, aimed at avoiding flow noise, extending life expectancy and increasing the volumetric flow. As a result, the range of valves was significantly extended by introducing additional valves with higher flow rates at the beginning of 2008 (kVS values increased by up to 30 percent).

Thanks to the higher kVS values, a smaller valve actuator will often do, thus offering attractive savings. For example, to handle a kVS value of 100 m3/h, a new VXF40.80-100 valve with an electrohydraulic SKD62 or electromotoric SQX62 actuator can be used in place of an VXF40.100 with SKC62. The new product combinations are much more favorably priced, reveals the company’s press release.