According to the different working principles of steam traps, they can be divided into the following three types:
1. Mechanical type: the action depends on the change of the condensed water level in the steam trap, including: floating ball type: the float is a closed hollow ball. Open up float type: the float is a bucket type with opening up. Open downward float type: the float is the bucket type with the opening downward.
2. Thermo static type: act according to the change of liquid temperature, including bimetallic sheet: the sensitive element is bimetallic sheet. Steam pressure type: sensitive components are bellows or ink cartridges, filled with volatile liquid.
3. Thermal power type: depending on the change of the thermal dynamic properties of the liquid. Disc type: due to the different flow rates of liquid and gas under the same pressure, different dynamic and static pressures are generated to drive the disc valve plate to act. Pulse type: due to the different temperature of condensate through the two pole series orifice plate, sitting between the two pole orifice plate of different pressure, drive the valve disc action.