Structural characteristics:    
1) Attached with steam or air heat preservation mechanism and unalfected by the environmental humidty, with operation frequency decreased and service life prolonged
2) Provided with filter screen and drainage valve
3) The valve runs flexibly and reliablly with large displacnment

4) Working principle: By taking advantage of thermodynamics characteristics, secondary evaporation will arese when the condensate water is discharge to the lower pressure zone and meanwhile when the viscosity and densith of steam differ, the drain valve will open or close  
5) Main functions: The valve is applicable in the steam pipeline and equipment to avoid steam leakage and eliminate steam leakage in order to conserve energy And keep from water hammer and other faults