This Standard specifies such valves for use in hydraulic-fluid systems of various machines among spool type four-port directional control valves operated by solenoid that are mounted on machines through sub-plate or directly by means of gaskets (hereafter referred to as "valves").However, this Standard is not applicable to valves for use in such special machines as aircrafts.
JIS B 8355:2009 Referenced Document
JIS B 0142 Fluid power systems and components -- Vocabulary*, 2011-02-21 Update
JIS B 1176 Hexagon socket head cap screws*, 2014-04-21 Update