International Organization for Standardization (ISO)
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ISO 9461:1992
Scope
Specifies rules for the identification. Applies in particular to valves which will be developed in future with two and three ports, where today's practice of marking valve ports is different. The identification rules apply to those ports which provide the connection between two valves or between a valve and a pipe.
ISO 9461:1992 history
1992ISO 9461:1992 Hydraulic fluid power; identification of valve ports, subplates, control devices and solenoids