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v23/v231 d12
self-operated pressure regulator（pilot-operated type）
v230/v 231 d13
structural features and applications
self-operated pressure regulator with pilot-operated consists of control valve, actuator, and pilot. it is an energy-saving product, which utilize the pressure change of the adjusted media to adjust the medium pressure automatically without any external energy. it is used for pressure control devices of non-corrosive (maximum temperature 300 ℃) media ,such as liquid, gas and steam. it is widely used in industrial sectors, such as, petroleum, chemical, metallurgy, light industry, and urban heating system.