when steam condensation release only saturated in the evaporation enthalpy of formation of condensate water enthalpy, in order to ensure the system's maximum heat transfer efficiency, condensate must be excluded from the system. Steam carried by air and other no non-condensable gas in the formation of thermal resistance layer on the surface of the steam and heat also must be excluded from the system.

steam trap is a kind of can automatically condensation water air and non-condensable gas exhaust steam system and can prevent steam discharge device.

basically has the following types: 1. Hot static type steam trap induction and super-cooling condensed water or steam/air mixture temperature difference between; 2. Mechanical type steam trap induction density difference between steam and condensate; 3. Thermodynamic type steam trap induction condensate at low speed and high speed flash steam power difference between;