What does the Yarway Automatic recirc valve do in the SU-MFW pump?

The Yarway Automatic recirc valve plays a crucial role in maintaining the operational efficiency and safety of a steam plant's main feedwater system, specifically in relation to the SU-MFW (Main Feed Water) pump. Its primary function is to open when the feedwater flow is below a designated minimum rate, ensuring that there is always adequate flow to maintain system pressure and prevent damage to the pump.

When the flow drops below this minimum threshold, the valve opens to allow a portion of the feedwater to recirculate back to the pump's inlet. This recirculation helps maintain a consistent flow rate, protecting the pump from damage due to cavitation or overheating, which can occur if it runs dry or under conditions of insufficient flow. By ensuring that there is always some flow present, the automatic recirc valve contributes to the reliability and longevity of the pumping system and enhances overall operational safety in the steam generation process.

Therefore, the correct understanding of this valve’s functionality is essential for the effective management of feedwater systems in power plants, highlighting its significance in preventing operational issues associated with low feedwater flow.