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The sight glass SG / SGR type: for CFC / HCFC / HFC, refrigerant liquid subcooling show no refrigerant inadequate instructions, reservoir level indication, compressor oil level indication, SG bell, brazing , SGR plug-Danfoss sight glass SGI / SGRI type: for HCFC and CFC refrigerants, indicating high water content in the refrigeration system, the refrigerant liquid subcooling no indication, indicating insufficient amount of refrigerant recharge, SGI bell , brazed, SGRI plug-in, saddle Danfoss sight glasses SGN / SGRN type: for HFC refrigerants, indicating high water content in the refrigeration system, a refrigerant liquid subcooling no indication insufficient refrigerant refill amount instructions, SGN bell, brazed, SGRN plug-in, saddle Danfoss sight glass SGH / SGRH type: for R410A, indicating moisture content is too high, no instructions subcooling refrigerant inadequate instructions, SGH bell, brazing, SGRH plug-in, saddle ambient outside temperature: -50 ℃ ~ + 80 ℃ maximum working pressure: SG: PS / MWP = 35bar SGI / SGN: PS / MWP = 35bar SGR / SGRI / SGRN: PS / MWP = 35bar SGH6,6s-22s: PS / MWP = 46bar. Spotlight: electronic expansion valve is mainly used for inverter air conditioning system, automatic adjustment of refrigerant flow. So that the air conditioning system is always in the best condition to run. Q series electronic expansion valves Introduction: the main by the valve body and coil. Electronic controller by sending a pulse signal to the coil to control the rotation of the rotor assembly, screw and nut drive through the rotary motion of the rotor member into a valve needle axially linear movement, thereby adjusting the valve port flow area, adjust the refrigerant traffic; and the stopper member moves up and down through the slip ring control valve needle up and down movement of the trip, in order to ensure the valve is always 0 <-> internal 500P movement;