In view of the characteristics of the acid fluid medium of the new acid extraction process,as well as the requirements of temperature and pressure,a kind of special hydrometallurgical switch valve which is resistant to scouring and pressurization was developed.According to the structural design and optimization of the special valve,a special switch valve for hydrometallurgy in hydrochloric acid working condition was developed,through the DN150 switch type special valve prototype has carried out a series of research experiments.The test results show that the developed special switching valve can meet the requirements. The key technology of 120-160 degree special valve used in pressurized hydrometallurgical process system for hydrochloric acid working condition is solved.