4A Series Pneumatic Valve This series pneumatic valves control spool dis- placement by pneumatic signal to change the position of valves, with good change over property, and long service life. It is widely applied to the executive elements such as drive air cylinder in pneumatic system and to safety operations at inflammable and explosive places. Adapter caliber: G1/8"~G1/2" Working pressure:0.15~0.8Mpa Applicable temperature:~5~50°C