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According to the different working principle of traps, traps can be divided into the following types: First, the mechanical trap: relying on the steam trap condensate level changes in the water level and action, including: Float type: the float is closed Hollow sphere upwards Float type: Float up to the opening of the barrel-type Open Float-down: Float is open down to the barrel Second, the thermostatic-type trap: Rely on the liquid temperature changes and actions, including: double Metal plate: sensitive original bimetal vapor pressure type: sensitive to the original bellows or ink cartridges, filled with volatile liquid inside Third, the thermodynamic-type trap: Rely on the thermodynamic properties of the liquid changes. Disc type: Due to the same pressure, the flow rate of liquid and gas are different, resulting in different dynamic and static pressure to actuate the disc valve pulse: Due to the different temperatures of the condensate through the two series in series orifice Plate, sitting in the bipolar orifice between the different pressures, driving the valve action.