Selection of power station control valve

In most cases, the power process is actually a cycle of water and steam. It is simple and complicated to select the control valve in this process.
In most cases, the power process is actually a cycle of water and steam. It is simple and complicated to select the control valve in this process. The simple process medium is simple, only water and steam. The complicated temperature and pressure fluctuation range of water and steam brings a series of problems such as flashing, cavitation, erosion, noise and corrosion. But the first thing to consider is the safety and reliability of the control valve.

Water supply valve (main, with boiler feed water valve, composite feed water regulating valve)

Control requirements: control boiler water intake, ensure steam evaporation, maintain boiler water level (main, attached boiler feed valve system contains two control valves, one for boiler start-up, one for normal water supply).

Working condition: When the boiler starts, the valve pressure difference can reach 100-300 kg, the flow rate is small, the pressure difference is small during normal operation, the flow rate is large, and the flow rate adjustable ratio is 75/1-100/1.

Valve requirements: WCB/WC9, for the starter valve in the double valve system requires anti-cavitation, V-level shutdown level, for the composite type water supply valve to use the characteristic valve internals to meet the needs of boiler start-up and normal operation. The general valve selection is fault off.

Boiler feed pump minimum flow circulation valve

Control requirements: to make the boiler feed pump safely start and stop running, to eliminate the damage caused by excessive flow, increased temperature rise, and strong cavitation of water. (Old-fashioned power plants have a switch-type minimum flow control valve, as well as a mechanical pump automatic circulation valve).

Working condition: The pressure drop reaches 160-350 kg, which is the valve with the largest pressure difference in the power station system, and the flow rate is 30% of the normal flow.

Valve requirements: anti-cavitation, anti-blocking structure, V-class sealing level, the valve works continuously when the pump starts and stops running, the valve is closed after the pump is started normally, and the valve is usually fault open.

High and low heater traps (water supply heater hydrophobic, condensate heater hydrophobic)

For more information on valve products, please visit: http://
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