This part can effectively avoid the transfer of body temperature to the upper stem and packing, and ensure the temperature of the upper parts and packing of the stem is above 0℃. The simulated temperature field of valve body without drain panel and with drain panel.
Through comparative analysis, it can be seen that the temperature at the upper end of valve cover with drain panel is significantly higher than that without drain panel. Extending the top of the bonnet reduces the temperature effectively, generally exposing the valve to air and causing it to liquefy into water droplets when it encounters low temperatures. The diameter of the drain plate is larger than that of the middle flange, so as to avoid the dripping of cryogenic liquefied water on the middle flange bolts and prevent the bolts from corroding.
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