Vapor Extraction Check Valve
Internal Structure
Function:
The extraction check valve is one of the important facilities to ensure the safe operation of the turbine. When the turbine dumps the load, they are closed quickly to protect the turbine from over speeding due to the return flow of steam, and to prevent water from entering the turbine with the water from the heater and pipeline.
Difference with the old structure:
The actuator adopts 90 degree rotary actuator, no linkage mechanism, not easy to jam.
Material:
Operation Temperature |
Body |
Bonnet |
Seat |
Disc |
Stem |
≤425℃ |
WCB |
A105 |
A105+STL |
A105+STL |
30Cr13 |
≤550℃ |
WC9 |
12Cr1MoV |
12Cr1MoV+STL |
12Cr1MoV+STL |
38CrMoAlA |