ISO/TR 17209:2013, Hydraulic fluid power – Two-, three- and four-port screw-in cartridge valves – Cavities with ISO 725 (UN and UNF) threads, is available from National Fluid Power Association (NFPA). This ISO Technical Report specifies dimensions and provides other data relating to cavities with ISO 725 UN and UNF threads in which 2-, 3-, and 4-port screw-in cartridge valves are mounted to ensure dimensional interchangeability.
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