Description Size 8 Component series A Maximum operating pressure 350 bar Maximum flow 45 l/min Features Pilot control valve Mounting cavity R/T-8A Direct-controlled directional slide valve with solenoid actuation Flow possible in both directions Positive overlap prevents switching shocks Wet-pin DC solenoids Solenoid coil can be rotated With concealed manual override Product description General information The 2/2 directional spool valves are direct operated, pressure-compensated screw-in cartridge valves. They control the start, stop and direction of flow and basically consist of housing (1), control spool (4) and a return spring (2). Function In the de-energized condition, the control spool (4) is held in the initial position by the return spring (2). The control spool (4) is actuated by wet-pin DC solenoids (3). The symbols are realized by different spools (N and P). The main ports ➀ and ➁ can be loaded continuously with an operating pressure of 350 bar and the flow can be directed into both directions (see Symbols). The manual override (5) allows for the switching of the valve without solenoid energization. It is also available in screwable version"N10" (6) (see Type keys). Version "K4" (with mating connector) Type KKDER8NA/HN9V Version "C4" Type code (valve without coil)1) 01 02 03 04 05 06 07 08 09 KKDE R 8 A / H V * 01 Directional spool valve, direct operated, electrically operated (pilot valve) KKDE 02 Maximum operating pressure 350 bar R 03 Component size 8 04 2 main ports Symbols N P 05 Component series A 06 High Performance and mounting cavity R/T-8A (see mounting cavity) H 07 Without manual override N0 With concealed manual override 2) N9 Seal material 08 FKM seals (other seals upon request) V Observe compatibility of seals with hydraulic fluid used. (Other seals upon request) 09 Further details in the plain text * 1) Complete valves with mounted coil on request. 2) Screwable manual override "N10" (actuation by means of internal hexagon with lock nut), can be ordered separately, material no. R901051231 ; ordering code “ N9 ”! Technical data general Size 8 Installation position any Ambient temperature range °C -40 … +110 Weight Valve kg 0.3 Coil kg 0.25 hydraulic Size 8 Maximum operating pressure 1) bar 350 Maximum flow l/min 45 Hydraulic fluid see table Hydraulic fluid temperature range °C -40 … +80 Viscosity range mm²/s 4 … 500 Maximum admissible degree of contamination of the hydraulic fluid 2) Class 20/18/15 according to ISO 4406 (c) Fatigue strength according to ISO 10771 10 million (at 350 bar) 1) At all ports 2) The cleanliness classes specified for the components must be adhered to in hydraulic systems. Effective filtration prevents faults and simultaneously increases the life cycle of the components. For the selection of the filters, see www.boschrexroth.com/filter. Hydraulic fluid Classification Standards Mineral oil HL, HLP DIN 51524 Bio-degradable Insoluble in water HEES (synthetic esters) VDMA 24568 HETG (rape seed oil) So
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