1Airtac solenoid valve series don't have electric leakage from outside, and also the electric leakage from inside is easily controllable, so it’s very safe to use. 2Airtac solenoid valve’s user system is very simple and cheap, because it is controlled by switching signal, it’s very convenient to connect computer. 3Airtac solenoid valve series have much less response time than internally piloted valve, more sensitive. Our design makes their size become smaller, so each of the series doesn’t cost much space, got light, handy and nice-looking outlook itself.. 4We have three kinds of solenoid valve classified by principle (1);Direct-acting solenoid valve can work in vacuum ,negative-pressure ,zero-pressure environment .(2)Step-wise direct-acting solenoid valve can work in zero-pressure, vacuum, high pressure environment.(3)Pilot operated solenoid valve can work in the most environment.