multi-stage pressure reduction control valve adopts the cage guided structure and pressure balanced plug. It is mainly used in service conditions with high differential pressure and applications that produce flash evaporation and cavitation. According to different parameters, it is designed with different pressure reduction cages that form a multi-stage pressure reduction trim. The cages designed according to different service conditions ensure the occurrence of flash evaporation and cavitation in the valve is eliminated. Throttling is carried out from the time the media contact the first cage, and the high differential pressure at the inlet is gradually reduced after several times of throttling. Thus it is effectively ensured that the pressure is always above the saturated vapor pressure when the media flow in the valve, and the occurrence of flash evaporation and cavitation is eliminated, so that the service life of the control valve is prolonged under severe service conditions.
Parameters of control valves：
| Trim features： | cage guided balanced trim structure balanced seal ring structure（normal temperature） metal seal ring structure (high temperature) |
| Body type： | straight-through type / angle type |
| Bonnet type： | standard type heat dissipation type |
| Flow characteristic： | equal percentage linear quick open |
| Size： | DN40-400（1.5”-16”） |
| Pressure class： | PN1.6、4.0、6.3Mpa（ANSI 150、300、600LB） |
| Leakage class： | ASME B16.104 Ⅴ（standard type metal seat） ASME B16.104 Ⅵ（shut-off soft seat） |
| Pipe connection type： | flange type butt welding type |
| Applicable temperature range： | -30C° ～ 260C°（balanced seal ring structure） -196C° ～ 550C°（metal seal ring structure） |
| Actuator type： | pneumatic diaphragm actuator pneumatic piston actuator electric actuator |
