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ARCA Regler GmbH
Kempener Str. 18
D-47918 Tönisvorst
[ T ] +49(0)2156-7709 0
[ F ] +49(0)2156-7709 55
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1. Main/Boiler Feedwater Control Valve
This valve is used to regulate the boiler drum to ensure that there is always enough feedwater in the boiler to create steam. The boiler feedwater control valve must have an equal-percentage characteristic to compensate for the difference between the characteristic of the boiler feedwater pump and the boiler plant (series 8C, 6H, 350, 380).

2. Fill/Boiler Feedwater Control Valve
This valve fills the boiler drum when the plant is started. Sizable differential pressure and cavitation must be controlled at this time, subjecting the valve to high forces and, thus, wear. Often small in design, it is equipped with hard, graduated valve trim and is positioned parallel to the main boiler feedwater control valve (series 8C, 6H, 180, 350).

3. Burner Control Valve
The burner control valve regulates the supply of natural gas to the gas burner or heating oil to the oil burner for the boiler. During gas operation, the valve regulates to maintain the defined control characteristic and reduce noise. When heating oil is used, this valve functions as an overflow facility and holds the pressure upstream of the oil burner nozzle constant (series 8C, 6N).

4. Sludge Control Valve
This valve quickly opens for a brief moment to drain a small quantity of boiler feedwater for desludging the boiler water drum. Hard internal parts are required to withstand the high differential pressure, cavitation, and abrasion that prevail. The seat faces of this control valve are subject to wear, which is why we recommend installing an additional shut-off valve here (series 8C, 6H, 180, 350, 380).

5. Start-Up Control Valve
The start-up control valve typically blows steam through a silencer system into the atmosphere when the boiler plant is started. The valve almost always has an asymmetrical shape because steam expands when pressure is suddenly reduced (series 8C, 6H, 350, 380).

6. Soot Blower Control Valve
The walls of the heat exchangers in the boiler are steam-cleaned of soot particles to optimize heat transfer efficiency inside the boiler. To this end, sootblower control valves feed live steam to the sootblower nozzles with minimum response time (series 6H, 180, 350, 380).

7. Air Preheater Control Valve
The burner air is preheated to optimize the effectiveness of the combustion process. The temperature of the burner air is determined by the steam fed to the air preheater via this control valve (series 8C, 6N).

8. 3-Way Mixing Valve (Variant I)
Superheating the steam of the steam turbines while they are running increases plant efficiency and prevents the turbine blades from becoming damaged by condensed drops of liquid. An intermediate superheating facility is installed for power plants with higher steam pressures to better harness the energy produced by the steam. The heat transferred to the superheater varies greatly due to fluctuating loads and soot deposits in particular. The temperature of the superheater must therefore be regulated. To this end, hot steam is channeled through a serpentine in the water-filled section of the steam drum via the 3-way mixing valve. The colder drum water, at saturated steam temperature, thereby cools the hot steam (series 200, 220).

9. Injection Cooler (Variant II)
Another common way of regulating the superheater temperature for new plants is to inject boiler feedwater using a controllable injection cooler (series 590).

The ARCA team
Mahmoud Odabai
Senior Engineer
[ T ] +49 (0) 2156/7709-102
[ F ] +49 (0) 2156/7709-4102
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