The ports of some valves are threaded with PE markings. Why?-PFA valve pharmaceutical valve flameproof valve comprehensive manufacturer

The ports of some valves are threaded with PE markings. Why?: The PE port is used to vent the air pressure used in the internal pilot type. A small amount of air will be temporarily discharged during the switch. If the port is blocked, it will cause bad action, so please do not block it. If you mind the noise, install a muffler. (even if the exhaust of pilot valves such as NewSY adopts centralized exhaust, it may have a PE port.)