valves of the turbine area
| Turbine Bypass valve 200 MW/300MW/600 MW/750MW |
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HP-Bypass Valve - DN 80-400 inlet - DN 250-1000 outlet - steam atomised spraywater - flow to close plug - downstream injection - water injection up to 30% of steam - low water temp. acceptable - low spraywater pressure required - short mixing and evaporation path |
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| DN 25 / 1“ – 1000 / 40“ PN 150 lbs - 4000 lbs Control Range: 25:1, 30:1, according to customer specifications Control characteristic: linear or equal percentage – linear Design: forged steel-welding construction or cast steel, angle form- straight pattern, Z-type Connections: welding ends, flanges Actuators: hydraulic actuators, pneumatic actuators, according to specifications |
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As to this steam conversion valve, the reduction of steam pressure and the steam cooling are separately arranged. The pressure reduction is affected via several stress-relieving stages. The design guarantees sub critical pressure reduction for the complete load range. This is achieved due to the stress-relieving whole bushes being split into separate chambers, so that the medium can only admit the stress-relieving chamber that is intended for it (Figure C). The chambers inside the stress-relieving bushes are formed by bushes having frames, thus preventing the medium from admitting the entirely free cross section of the stress-relieving hole bush. By design the swelling steam reaches the desuperheater before the steam is completely reduced to the required outlet pressure (Figure C). So it can be guaranteed that at all times swelling steam is available to ensure water atomisation. |
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Figure C |
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All
materials according to DIN or ANSI / ASTM. For the main
parts of our valves we use standard material as listed below
or according to our customer specifications. |
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1.4903
1.4931