2. Small flow circulating valve of boiler feed pump: control requirements: make the boiler feed pump start and run safely, and eliminate pump damage caused by too small flow, increased temperature rise, and strong water cavitation. (The old power stations use switch type small flow pneumatic control valve, and also use mechanical pump automatic circulation valve). Working condition: the pressure drop reaches 160-350kg, which is the valve bearing large pressure difference in the power plant system, and the flow is generally 30% of the normal flow. Valve requirements: anti cavitation, anti blocking structure, Class V sealing level, the valve works continuously when the pump starts and stops running, the secondary valve is closed after the pump starts normally, and the valve is usually opened in fault.

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