Difference between thermodynamic traps and disc-type traps

The disc-type steam trap is a type of thermodynamic steam trap. The main component of a thermodynamic steam trap is the bimetallic strip sensor, which deforms when heated as the steam temperature changes, thereby driving the valve core to open and close the valve. Thermodynamic steam traps are equipped with adjustment bolts that allow the operating temperature to be adjusted as needed. Generally, the supercooling range is between 15°C and 30°C below the saturation temperature; they can handle back pressures of over 70%, are capable of discharging non-condensable gases, are not susceptible to freezing, have a small size, can resist water hammer, tolerate high pressures, and can be installed in any location. Bimetallic strips are prone to fatigue and require frequent adjustment. When the device is first started, low-temperature condensate appears in the pipes; the bimetallic strip is flat, and under the force of the spring, the valve core keeps the valve in the open position. As the temperature of the condensate water gradually rises, the bimetallic temperature sensing element begins to bend and deform, pushing the valve core toward the closed position. The steam trap begins to close before the condensate reaches its saturation temperature. The bimetallic strip controls the opening and closing of the valve as the steam temperature changes, thereby preventing steam from passing through while allowing water to drain. Its feature is that no condensate remains in front of the valve during operation. Due to the structural principle, the hydrophobicity speed is not adjustable. If it is necessary to adjust the drainage speed (i.e., to control the temperature of the condensed liquid), other types of steam traps can be used; for example, float-type steam traps can retain a certain amount of hot water before the valve, while bimetallic steam traps can control the discharge temperature.