Classification |
Names of Valves |
Materials |
(NPS) Normal Pipe Size(NPS) |
Pressure Rating |
Installation Position |
|
Type One |
1. Gate valves |
WB36, F91, etc. | ≤24" | ≤4500 | For water supply pipelines and stream pipelines |
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2. Global valves |
WB36, F91, etc. | ≤6" | ≤4500 | For water supply pipelines, stream pipelines |
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3. Check valves |
WB36, F91, etc. | ≤24" | ≤2500 | For water supply pipelines and stream pipelines |
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4. Relief valves |
WB36, A105, etc. | ≤6" | ≤3000 | For water supply pipelines |
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Type Two |
1. Safety valves |
F91 and F92 | ≤6" | ≤1500 | For reheater inlets /outlets |
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2. Main steam gate valves |
F92 | ≤22" | ≤4500 | For main steam pipelines |
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3. Traps |
F91 and F92 | ≤3" | ≤4500 | For drain pipelines |
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4. Extraction check valves |
WC9 and C12A | ≤48" | ≤2500 | For pumping pipelines |
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5. High-pressure heater three-way valves(hydraulic, electric ) |
WB36 | ≤20" | ≤2500 | For high-pressure heater feed water pipelines |
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6. Pneumatic butterfly valves |
A105 and Q345B | ≤2800mm | PN6bar | For small-sized turbine exhaust pipelines |
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7. Partial control valves |
WC9, F22, F91, etc. | ≤16" | ≤2500 | For reheater desuperheating water, high-pressure HP heater drain steam, soot blowing reducing station and water storage tank pipelines |
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Type Three |
1. Main stream safety valves |
Superheater outlet safety valves |
F92 | 2.5" | 4500 | Higher than the position of the outlet |
Superheater inlet safety valves |
WC9 | 3" | 4500 | |||
2. Electromagnetic relief valves |
F92 | 2.5" | 4500 | Higher than the position of the outlet | ||
3. Control valves |
Control valves for boiler BCP circulation pipeline |
WC9 | 16" | 2500 | For boiler circulation pipelines |
|
Feed water bypass control valves |
WC9 | 14" | 2500 | Boiler feed water bypass pipelines |
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Feed pump recycling control valves with minimum flow |
WB36 | 8" | 2500 | For feed pump recirculation pipelines |
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Pressure regulating valves |
F92 | 3" | 4500 | For high-pressure steam supply stations of steam engines |
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Reheater spray water control valves(with adjustable nozzles) |
SA106C | 3" | 1500 | Reheater spray water pipelines |
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4. High pressure by-pass valves |
High pressure bypass valves |
F92 | 14/30" | 4500 | For high pressure bypass steam pipelines |
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| High pressure spray water control valves | WB36 | 6" | 2500 | High pressure by-pass desuperheating water pipelines |
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| High pressure spray water isolation valves |
WB36 | 6" | 2500 | For high pressure bypass desuperheating water pipelines |
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They belong to the same type of valve |
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5. Low pressure by-pass valves |
Low pressure bypass valves |
F92 | 22/36" | 1500 | For low pressure bypass steam pipelines |
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| LBPE | WCB | 8" | 300 | For low pressure bypass desuperheating water pipelines |
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(They belong to the same type of valve) |
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Low pressure spray water isolating valves |
WCB | 8" | 300 | For low pressure bypass desuperheating water pipelines |
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(They belong to the same type of valve) |
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