Description Size 6 Component series 4X Maximum operating pressure 350 bar Maximum flow 50 l/min Features Sandwich plate valve Porting pattern according to ISO 4401-03-02-0-05 (with or without locating hole) 4 pressure ratings 4 adjustment types: • Rotary knob • Sleeve with hexagon and protective cap • Lockable rotary knob with scale • Rotary knob with scale Pressure reduction in channel A, B or channel P Check valve, optional (version “A” only) Corrosion-protected design Product description The valve type ZDR is a direct operated pressure reducing valve in sandwich plate design with pressure limitation of the secondary circuit. It is used to reduce the system pressure. The pressure reducing valve basically comprises housing (1), control spool (2), compression spring (3), adjustment type (4) and an optional check valve. The secondary pressure is set via the adjustment type (4). Version "A" The valve is open in initial position. Hydraulic fluid can flow from channel A➀ to channel A➀ without restrictions. The pressure in channel A➀ is simultaneously applied via the control line (5) at the piston area opposite the compression spring (3). If the pressure in channel A➀ exceeds the value set at the compression spring (3), the control spool (2) is pushed against the compression spring (3) to control position and keeps the set pressure in channel A➀ at a constant level. Control signal and pilot oil are supplied internally via the control line (5) from channel A➁. If the pressure in channel A➀ increases further due to an external force effect at the actuator, it pushes the control spool (2) even further against the compression spring (3). In this way, channel A➀ is connected to the tank via the control edge (9) at the control spool (2) and the housing (1). So much hydraulic fluid is discharged into the tank that the pressure does not increase any further. The leakage oil drain from the spring chamber (7) is always effected externally via the bore (6) and channel T (Y). A pressure gauge connection (8) allows for the control of the secondary pressure at the valve. A check valve can be used for free flow back from channel A➀ to A➀ with version “A”. Versions “P” and “B” For version “P”, the pressure reduction is effected in channel P➀. Control signal and pilot oil are supplied internally from channel P➀. For version “B”, the pressure is reduced in channel P➀; but the pilot oil is extracted from channel B. Notice: If the directional valve is in spool position P to A, the pressure in channel B may not exceed the set secondary pressure. Otherwise, there is pressure reduction in channel A. Type ZDR 6 DA1-4X/.YM… ① component side ② plate side Type code 01 02 03 04 05 06 07 08 09 10 11 12 13 14 Z DR 6 D – 4X / Y * 01 Sandwich plate valve Z 02 Pressure reducing valve DR 03 Size 6 6 04 Direct operated D 05 Pressure reduction in channel A➁ A Pressure reduction in channel B➁ B Pressure reduction in channel P➁ P Adjustment type 06 Rotary knob 1 Sleeve with hexagon and pr
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