What condition triggers the opening of the Yarway Automatic recirc valve?

The opening of the Yarway Automatic recirc valve is primarily triggered by a condition where the feedwater flow falls below a predetermined minimum rate. This mechanism is essential for maintaining safe operating conditions within the steam system. When the flow drops to this level, it indicates that the system may not have enough water to maintain proper circulation, which is critical for both the efficiency and safety of boiler operations.

By opening the recirc valve, the system allows for a controlled return of water into the feedwater system, promoting stability and preventing overheating or other potential damage due to insufficient water supply. This action helps to ensure that adequate flow conditions are restored, protecting the integrity of the equipment and continuing safe operation.

The other conditions listed, such as excessive heat generation, high system pressure, and loss of electrical power, would not specifically trigger the opening of the recirc valve in the same way. Instead, they might lead to different operational responses or mitigate risks related to the operation of the system.