Type : Valves
Hydraulic Valves : VDHA / Speed Control Valve, RHD / Check Valve, DV / Needle Valve
https://www.parker.com/parkerimages/euro_tfd/cat/english/Katalogteile%204100-6/Kapitel%20I/4100-6-UK%20I%20(DIN%20fittings).pdf