Installation issues with steam pipeline traps
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Thermostatic bimetallic steam traps are often installed on superheated steam pipes, and thermostatics function by sensing different temperatures to open or close. Typically, there is a 1–2 m long uninsulated cooling section in front of the bimetallic steam trap on saturated steam pipelines. For superheated steam, there is already a temperature difference between the condensate and the superheated steam itself – is a heat-insulated cooling section still necessary?
Working principle of the bimetallic strip steam trap: When the device is first started, low-temperature condensate appears in the pipeline; 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 element sensing temperature 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. In principle, to prevent delayed drainage, a supercooling section is still necessary to ensure the degree of supercooling.
Thank you for the analysis and discussion; I’ve learned a lot.