Siemens MVS661.25-6.3N 2-PORT REFRIG VALVE, PN 63, DN25, 6.3KVS, 24VAC/DC, 0/2...10 VDC / 0/4...20 MASiemens MVS661. 25 6. 3N 2 port refrig valve, PN 63, DN25, 6. 3kvs, 24VAC DC, 0 2 10 VDC 0 4 20 mA Hermetically sealed 2 port valves for modulating control of refrigerant circuits including chillers and heat pumps. Additional Information Ambient temperature, operation 2555 C Degree of protectionIP65 kvs6. 3 m h kvs reduced4 m h Leakage rate0. 002 % of kvs Material, inside setCrNi steel Material, valve bodySteel CrNi steel Medium temperature 40120 C;