Yuyao No.4 Instrument Factory has been a professional piston 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 piston valves, piston check valve, piston pilot solenoid valve, piston pilot magnetic valve, piston pilot pneumatic valve, solenoid valve for steam medium products have been exporting to more than twenty countries and areas, such as USA, France, UK, Germany, Australia, Pakistan, Taiwan, etc.