FAQ

|Process Valves

What is the correct method for piping the pilot ports and pilot exhaust ports (bleed ports) of VNA, VNB, VNC, VNH, and VND series valves?

Refer to the following for piping to the port on the top of the body of each VN□ series valve.
① The external pilot type is used with port 12 (P1) pressurized at all times.
② For the VNA/VNB□03□ (air operated type, C.O. type), it is always used with 1 of the pilot ports pressurized.
③ Although the pilot exhaust port (bleed port) is an air release port, it is recommended that a silencer be installed to prevent the entry of foreign matter and to reduce noise.
Note) For pilot air pressure, refer to the “Specifications” section in the catalog of each series.
Reference) SGC and SGH series coolant valve PE ports have a filter mounted as standard.