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 | |
2. Global valves | WB36, F91, etc. | ≤6" | ≤4500 | For water supply pipelines, stream pipelines | ||
3. Check valves | WB36, F91, etc. | ≤24" | ≤2500 | For water supply pipelines and stream pipelines | ||
4. Relief valves | WB36, A105, etc. | ≤6" | ≤3000 | For water supply pipelines | ||
Type Two | 1. Safety valves | F91 and F92 | ≤6" | ≤1500 | For reheater inlets /outlets | |
2. Main steam gate valves | F92 | ≤22" | ≤4500 | For main steam pipelines | ||
3. Traps | F91 and F92 | ≤3" | ≤4500 | For drain pipelines | ||
4. Extraction check valves | WC9 and C12A | ≤48" | ≤2500 | For pumping pipelines | ||
5. High-pressure heater three-way valves(hydraulic, electric ) | WB36 | ≤20" | ≤2500 | For high-pressure heater feed water pipelines | ||
6. Pneumatic butterfly valves | A105 and Q345B | ≤2800mm | PN6bar | For small-sized turbine exhaust pipelines | ||
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 | ||
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 | ||
Feed pump recycling control valves with minimum flow | WB36 | 8" | 2500 | For feed pump recirculation pipelines | ||
Pressure regulating valves | F92 | 3" | 4500 | For high-pressure steam supply stations of steam engines | ||
Reheater spray water control valves(with adjustable nozzles) | SA106C | 3" | 1500 | Reheater spray water pipelines | ||
4. High pressure by-pass valves | High pressure bypass valves | F92 | 14/30" | 4500 | For high pressure bypass steam pipelines | |
| High pressure spray water control valves | WB36 | 6" | 2500 | High pressure by-pass desuperheating water pipelines | ||
| High pressure spray water isolation valves | WB36 | 6" | 2500 | For high pressure bypass desuperheating water pipelines | ||
They belong to the same type of valve | ||||||
5. Low pressure by-pass valves | Low pressure bypass valves | F92 | 22/36" | 1500 | For low pressure bypass steam pipelines | |
| LBPE | WCB | 8" | 300 | For low pressure bypass desuperheating water pipelines | ||
(They belong to the same type of valve) | ||||||
Low pressure spray water isolating valves | WCB | 8" | 300 | For low pressure bypass desuperheating water pipelines | ||
(They belong to the same type of valve) | ||||||
