We have several variations of the SY valve that are specially designed to be used in specific safety circuits.
SY-X350 series Spring return spool
SY-X31 series Pilot air control with spool position detection
SY-X25 series Spool with detent
SY-X310 series Pilot air control with pressure detection option
SY-X30 series Spool position detection
Please see the links to the respective leaflets below.