1. Live-Steam Control Valve
This control valve is used to regulate the pressure at which the live steam enters the turbine. Turbines for medium-sized thermal and industrial power plants require both straight-way and angle-pattern in sizes 8" to 20" (DN200 to DN500) with fast control and positioning times.
2. Extraction Steam Control Valve
This valve can feed the MP steam mains to meet the power stasion's requirements or regulate the pressure of process steam in industrial plants (e.g. chemical plants and paper mills) that frequently control multiple steam mains to supply a wide variety of heat exchangers. To meet these requirements, both straight-way and angle-pattern control valves in sizes 6" to 20" (DN150 - DN500) with large cv values for low differential pressure and a fast stroke positioning times of under 5 seconds are essential to tap the turbine with minimum energy loss.
3. Seal-Steam Control Valve
HP, LP, and MP turbine shafts of steam turbines are axially sealed with respect to the turbine housing and use labyrinth seals near the shaft throughput. The seal-steam control mechanism is required to maintain a predetermined low level of overpressure at the shaft labyrinths, regardless of load changes in the turbine or condenser.
Should seal-steam pressure be too high, steam that leaks from the shaft labyrinths can come into contact with the bearing bodies via the oil-sealing rings and condense to water in the oil system. On the other hand, should the seal-steam pressure be too low, air can be drawn in redicing vacuum pressure and further promotes the formation of condensate.
The seal-steam control mechanism is therefore designed to feed steam to the labyrinth chamber and purge any accumulating leakage steam, depending on the type of turbine and the method in which it operates.
Seal steam (usually live steam) is fed using the seal-steam control valve in sizes 1/2" to 4" (DN15 - 100), which is often required to regulate in a very accurately under high differential pressure.
4. Leakage-Steam Control Valve
The conditions that apply to the Seal-Steam Control Valve also apply to this control valve. Leakage steam is then purged using the leakage-steam control valve in sizes 2" to 8" (DN50 - 200), whereby the steam is extracted into the condenser vacuum after the valve (series 8C, 6N).
5. Seal-Steam Temperature Cooler
Live steam frequently has extremely temperatures, especially at the shaft on the low-pressure side of industrial turbines. This can be counteracted with a mini cooler / desuperheater in sizes 2 1/2" to 6" (DN65 - 150) or similar.
6. Cooling Water Control Valve
Cooling water (typically condensate) is fed to the cooler with this valve in sizes 1/2" to 2" (DN15 - 50) to regulate temperature.
7. Drain Valve
All low points in steam pipelines and turbine chambers must feed accumulated condensate to the condensate collector as the system warms up and during operation by way of a switching or control valve in sizes 1/2" to 2" (DN15 - 50).
8. Exhaust Steam Temperature Cooler
Exhaust steam from the turbine provides steam to the low-pressure steam mains (it's temperature is cooled by the exhaust cooler), depending on the type of turbine and the way it operates in industrial plants.
Valve & Automation factory trained specialists with extensive plant experience will be able to assist in sizing and selecting the correct control valve for your application. Talk to one of our Technical Specialists today!
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