Yuyao No.4 Instrument Factory has been a professional normally open valve manufacturer of solenoid valves and has enjoyed an excellent reputation through the past more than 40 years in China. In the past few years, she has been devoting to expanding the business scope and now could supply our customers with many kinds of valves. Most of our custom normally open valves, normally open solenoid valve, normally closed solenoid valve, valve for weak acid medium, valve for alkali medium products have been exporting to more than twenty countries and areas, such as USA, France, UK, Germany, Australia, Pakistan, Taiwan, etc.