4/3-4/2 Directional valve elements B8_0A with or without (EDB-A) secondary relief valves, with or without LS connections B8_0A (EDB-A)

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1 4/3-4/2 Directional valve elements B8_A with or without (EDB-A) secondary relief valves, with or without LS connections B8_A (EDB-A) RE Edition: Replaces: 7.12 Size 4 Series Maximum operating pressure 31 bar (45 psi) Maximum flow 25 l/min (6.6 gpm) ort connections G 3/8 SAE6 - M16x1.5 General specifications Valve elements with 4 ways and 3, or 2, positions. Control spools directly operated by screwed-in solenoids with extractable coils. In the de-energized condition, the control spool is held in the central position by return springs. Wet pin tubes for DC coils, with push rod for mechanical override; burnish surface treatment. Coils can be rotated 36 around the tube. Manual override (push-button or screw type) available upon request. lug-in connectors available: DIN 4365 ISO 44, AM Junior, DT4-2 (Deutsch), Free leads. Contents Ordering details 2 Functional description 4 Technical data 4 Characteristic curves 6 External dimensions and fittings 7 Electric connection 8 RE /11.218, Bosch Rexroth AG

2 2 B8_A (EDB-A) 4/3-4/2 Directional valve elements Ordering details Ordering details B 8 A Family 1 Directional Valve elements EDB B Type 2 Size 4 8 Configuration 3 Standard With secondary valve on A 1 With channels for Load Sensing 4 Coil type 4 D36 A Spool variants 1) 5 4/3 operated on both sides a and b _ 2 4/2 operated on side a only _ 3 Voltage supply 6 Without coil 12 V DC OB 24 V DC OC 48 V DC OD 96 V DC OU 25 V DC AH Electric connections 7 Without coils With coils, without mating connector DIN EN ) 1 2) With coils, with bi-directional diode, without mating connector vertical Amp-Junior 3 With coils, with bi-directional diode, without mating connector horizontal Amp-Junior 4 With coils, with bi-directional diode, without mating connector DT4-2 7 With coils and bipolar sheathed lead 3mm (11,8 in) long 31 orts 8 G 3/8 DIN M 16x1,5 DIN 3852 U 9/16-18 UNF 2-B (SAE6) B Secondary valves setting bar ( psi) 3) 1-31 bar ( psi) bar ( psi) 2 Options 1 No options No code Standard ush-button type manual override Screw type manual override F = Available = Not available T T Symbols LS T A A A B B B = = 1 = 4 1) The required hydraulic symbol and spool variant can be chosen by consulting page 3. 2) For connectors ordering code see data sheet RE ) Without secondary valve (versions B8 ; B84 ), the standard configuration corresponds to. The secondary valves have a maximum flow capacity of 6 l/min (1.6 gpm). Bosch Rexroth AG, RE /11.218

3 4/3-4/2 Directional valve elements B8_A (EDB-A) Ordering details 3 Spool variants A_ 2 A_ 3 a A B a b T b a A a B T =B21 =X31 =E21 =Y31 =K21 RE /11.218, Bosch Rexroth AG

4 4 B8_A (EDB-A) 4/3-4/2 Directional valve elements Functional description Functional description The sandwich plate design directional valve elements B8_5 are very compact direct operated solenoid valves which control the start, the stop and the direction of the oil flow. These elements basically consist of a stackable housing (1) with a control spool (2), one or two solenoids (5), and one or two return springs (4). When energized, the force of the solenoid (5) pushes the control spool (2) from its neutral-central position to the required end position a or b, and the required flow from to A (with B to T), or to B (with A to T) is achieved. Once the solenoid is de-energized, the return spring (4) pushes the spool thrust washer (3) back against the housing and the spool returns in its neutral-central position. Each coil is fastened to the solenoid tube by a ring nut (6). A pin (7) allows to push the spool (2) in emergency conditions, when the solenoid cannot be energized, like in case of voltage shortage. Technical data General Valve element with 2 solenoids kg (lbs) 1.3 (2.86) Valve element with 1 solenoid kg (lbs) 1. (2.2) Ambient Temperature C ( F) ( ) (NBR seals) Hydraulic Maximum pressure at, A and B ports bar (psi) 31 (45) Maximum dynamic at T bar (psi) 25 (3625) Hydraulic fluid General properties: it must have physical lubricating and chemical properties suitable for use in hydraulic systems such as, for example: Mineral oil based hydraulic fluids HL (DIN part 1). Mineral oil based hydraulic fluids HL (DIN part 2). For use of environmentally acceptable fluids (vegetable or polyglycol base) please consult us. Fluid Temperature C ( F) ( ) (NBR seals) ermissible degree of fluid contamination ISO 4572: β x 75 X= ISO 446: class 2/18/15 NAS 1638: class 9 Viscosity range mm 2 /s Bosch Rexroth AG, RE /11.218

5 4/3-4/2 Directional valve elements B8_A (EDB-A) Technical data 5 Electrical Voltage type DC (AC only with RAC connection) Voltage tolerance (nominal voltage) % Duty Continuous, with ambient temperature 5 C (122 F) Coil wire temperature not to be exceeded C ( F) 18 (356) Insulation class H Compliance with Low Voltage Directive LVD 73/23/EC (26/95/EC), 24/18/EC Coil weight with connection EN kg (lbs).18 (.4) Voltage V Voltage type DC DC DC DC DC ower consumption W Current (nominal at 2 C (68 F)) A Resistance (nominal at 2 C (68 F)) Ω Note For applications with different specifications consult us Code Voltage [V] Connector type Coil description Marking Coil Mat no. OB 1 12 DC EN D361 12DC 12V DC R OB 3 12 DC AM JUNIOR D363 12DC 12V DC R OB 4 12 DC AM JUNIOR Horizontal D364 12DC 12V DC R OB 7 12 DC DEUTSCH DT 4-2 D367 12DC 12V DC R OC 1 24 DC EN D361 24DC 24V DC R OC 3 24 DC AM JUNIOR D363 24DC 24V DC R OC 4 24 DC AM JUNIOR Horizontal D364 24DC 24V DC R OC 7 24 DC DEUTSCH DT 4-2 D367 24DC 24V DC R OD 1 48 DC EN OU 1 96 DC EN AH 1 25 DC EN D361 48DC 48V DC R D361 96DC 96V DC R D361 25DC 25V DC R Note For further versions (i.e. cable single lead) contact factory. RE /11.218, Bosch Rexroth AG

6 6 B8_A (EDB-A) 4/3-4/2 Directional valve elements Characteristic curves Characteristic curves ressure Δp psi bar Spool Variant Curve no. >T >A >B A>T B>T B E K Y X l/min gpm Flow Q Measured with hydraulic fluid ISO-VG32 at 45 ±5 C (113 ±9 F); ambient temperature 2 C (68 F). erformance limits RESSURE-p psi bar l/min gpm FLOW-Q Minimum flow for efficiency of LS control psi bar l/min ressure p Spool Variant Curve no. B21 2 E21 1 K21 3 X31 1 Y31 2 The performance curves are measured with flow going across and coming back, like >A and B>T, with symmetrical flow areas. In case of special circuit connections, the performance limits can change gpm Flow Q Lowest pressure setting curve for secondary valves psi bar l/min ressure p Secondary valve setting Curve no bar (7-295 psi) 1-31 bar (14-45 psi) bar (35-7 psi) gpm Flow Q Bosch Rexroth AG, RE /11.218

7 Dimensions [mm (inches)] 4/3-4/2 Directional valve elements B8_A (EDB-A) External dimensions and fittings 7 External dimensions and fittings 1 Solenoid tube Ø 16mm (.63inch). Torque 2 22 ( ft-lb). 2 Ring nut for coil locking (OD 26,5 mm (1,4inch)); torque 3-4Nm (2.2-3 ft-lb). 3 Identification label. 4 Clearance needed for connector removal. 5 Optional push-button emergency, E type, for spool opening: it is pressure stuck to the ring nut for coil locking. Mat no. R Optional screw type emergency, EF type, for spool opening: it is screwed (torque 6-7 ( ft-lb)) to the tube as replacement of the coil ring nut. Mat. no. R Flange specifications for coupling to ED intermediate elements. 8 One through hole for coupling of the ED Directional Valve Elements. Recommended tie rod M8 with strength class DIN 8.8. Torque Nm ( ft-lb). 9 O-Rings for and T ports. 1 Space needed for secondary valve. 11 lug for 2 positions versions (4/2); Ø 22 mm, torque 2-22 Nm ( ft-lb). 12 A and B ports. RE /11.218, Bosch Rexroth AG

8 8 B8_A (EDB-A) 4/3-4/2 Directional valve elements Electric connection Dimensions [mm (inches)] Electric connection 1 3 rotection class: I 65 with female connector properly fitted (see drawing). 4 rotection class: I 65 with female connector properly fitted (see drawing) rotection class: I 69 K with female connector properly fitted (see drawing). Bosch Rexroth Oil Control S.p.A. Oleodinamica LC Division Via Artigianale Sedrio, Vezzano sul Crostolo Reggio Emilia - Italy Tel Fax / compact-hydraulics-cdv@boschrexroth.com This document, as well as the data, specifications and other information set forth in it, are the exclusive property of Bosch Rexroth Oil Control S.p.a.. It may not be reproduced or given to third parties without its consent. The data specified above only serve to describe the product. No statements concerning a certain condition or suitability for a certain application can be derived from our information. The information given does not release the user from the obligation of own judgment and verification. It must be remembered that our products are subject to a natural process of wear and aging. Subject to change. Bosch Rexroth AG, RE /11.218