The 10S Series unbalanced multi-stagepressure drop control valve is suitable for applications with high differentialpressure and applications t hat produce flash evaporation and cavitation.According to the requirements in different service conditions, it is designedwith various multi-hole cages that form a multi-stage pressure drop that form amulti-stage pressure drop trim, so that the internal energy of high trim, sothat the internal energy of high                                                                                                          speedmedia is consumed and flow velocity is reduced from the time when the fluidscontact the first cage. As it is composed of various cages, the pressure isgradually reduced so that the medium pressure is always above the saturatedvapor pressure, and the occurrence of flash evaporation and caitation iseliminated. The standard configuration is the unbalanced single- seat plug andthe plug and seat are subjected to hardening treatment to prolong the servicelife of the trim. The valves of large sizes can be designed with the balancedsingle-seat plug structure.