The fluids carry out pressure reduction stage by stage, its direction is constantly changing and the flowing resistance is increasing, so that cavitation damage is avoided when the fluids are under high differential pressure. The throttling part is separable from the sealing face to effectively protect the sealing face. The trim surface is subjected to hardening treatment, reaching a hardness of about HRC70. It is featured by good erosion resistance and long service life. The valve is mainly used in feed water systems in large-sized generating units. It is an important piece of equipment used to avoid cavitation in boiler feed water pumps, and is also a key control valve in power plants. The minimum flow recirculation valve can be pneumatically or electrically controlled.
Parameters of control valves:
Trim features:Body type:Bonnet type:Flow characteristic:Size:Pressure class:Leakage class:Pipe connection type:Applicable temperature range:Actuator type:
| labyrinth cage trim multi-stage throttle valve plug structure |
| straight-through type angle type |
| standard type |
| equal percentage linear quick open |
| DN50-100(2"-4") |
| PN25,32Mpa(ANSI 1500,2500LB) |
| ASME B16.104 Ⅴ(standard type metal seat) |
| flange type butt welding type |
| less than 420C° |
| pneumatic diaphragm actuator pneumatic piston actuator electric actuator |
