Repair issues with Siemens thermostatic valves

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1. Steam leakage from the valve stem: a. Check whether the valve stem is damaged or deformed; if so, it needs to be replaced. b. If the valve stem seal is not properly sealed, use an internal hex key or another suitable tool to insert it into the side hole of the sealing plug, and rotate it clockwise to compress the seal. Note: Do not tighten it too much, otherwise it may lock the valve stem. 2. Steam leakage from the bell jar: a. Check whether the bolts have loosened due to vibration, and tighten them with a wrench. b. Check whether the sealing areas are aged; if so, replace them. 3. The valve stem does not move. a. Check whether the connection to the actuator is proper and whether there is any detachment. b. Check whether the steam temperature is too high, causing the metal to expand and lock the valve stem. If so, use an Allen key or another appropriate tool to insert it into the side hole of the sealing plug and rotate it counterclockwise to slightly loosen the seal. Note: Do not loosen it too much, otherwise steam leakage may occur.