●Used in situations where the piping distance between the measuring device and the operating part is very long or the volume of the operating part is large. ●The driving speed of the operation part is greatly improved ●When an abnormality occurs in the gas source or gas supply piping system in the pneumatic process control pipeline, use the locking valve Single-acting, double-acting type: keep the position of the operating part in emergency until the air source returns to normal condition Tee port: When an abnormality occurs, switch the supply port Category: Speed-increasing relay, Brand: SMC, Series: IL