The main purpose

The minimum flow circulation valve of the boiler feed water pump enables the boiler feed water pump to start and stop running safely, eliminating damage to the pump caused by too small flow, increased temperature rise, and strong water cavitation. The pressure drop before and after the valve reaches 16-35MPa. It is the valve with the largest pressure difference in the power station system, and the flow rate is 30% of the normal flow rate. The valve is required to be resistant to cavitation, have an anti-blocking structure, and operate continuously when the pump is started and stopped. The valve is closed after the pump is started normally, and the valve is usually open due to a fault.

Features

• The valve body and valve cover are integrally forged, and other pressure-bearing parts are forged, with uniform structure and beautiful appearance;

• The internal parts adopt a press-fit porous superimposed pressure reduction structure, changing the traditional one-time pressure reduction into multiple pressure reductions. It has a compact structure, anti-cavitation, low noise, and easy installation and maintenance;

• The valve cover and internal parts adopt stepped limit seals, and the valve stem packing adopts a combination of V-shaped flexible graphite and reinforced molded graphite to improve sealing performance;

• The regulating valve can be equipped with our pneumatic actuator, or other brands of pneumatic, electric or hydraulic actuators according to customer requirements.

Main design specifications