4/3 and 4/2 Proportional directional valve elements L8580 with flow (EDC-P) sharing control (LUDV concept) PATENT PENDING

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1 / and / Proportional directional valve elements L88 with flow (EDC-P) sharing control (LUDV concept) PATENT PENDING L88 (EDC-P) RE Edition:.16 Replaces: Size 6 Series Maximum operating pressure 1 bar ( psi) Maximum flow at 1 bar ( psi) l/min (1. gpm) Maximum flow at 18 bar (61 psi) 8 l/min (1. gpm) Ports connections planned G /8 - G 1/ - SAE8 and Modular General specifications Valve element with direct proportional flow sharing control. It can achieve the simultaneous activation of different actuators by distributing the available flow proportionally to the speeds selected by the operator. All simultaneous movements go on at the same reciprocal speed also in case of flow shortage. Each energized actuator receives a pressure compensated flow. No shuttle valve fitted. Wet pin proportional tubes for DC coils, with push rod for mechanical override; nickel plated surface. Manual override (push-button, screw type or lever) available as option. Different plug-in connectors available: see ordering details. Contents Ordering details Symbols Functional description Technical data Characteristic curves 6 External dimensions and fittings 8 Electric connection 1 RE 181-9/.16, Bosch Rexroth AG

2 L88 (EDC-P) / and / Proportional directional valve elements Ordering details Ordering details L 8 8 Family 1 Directional Valve elements ED L Type Size 6 proportional 8 Configuration Flow Sharing Coil type D1 8 Spool variants / operated both sides a and b; P, A, B, T closed in neutral B / operated on side a only; P, A, B, T closed in neutral B / operated on side b only; P, A, B, T closed in neutral B / operated on both sides a and b; P closed; A and B to T in neutral E / operated on side a only; P closed; A and B to T in neutral E / operated on side b only; P closed; A and B to T in neutral E 1) - ) Flow pattern & Nominal flow 6 Both meter in and out, A l/min(1.6gpm) - B l/min(1.6gpm) S Both meter in and out, A 8l/min(1.8gpm) - B 8l/min(1.8gpm) S1 Both meter in and out, A 1l/min(.17gpm) - B 1l/min(.17gpm) S Both meter in and out, A 16l/min(.gpm) - B 16l/min(.gpm) S Both meter in and out, A l/min(6.6gpm) - B l/min(6.6gpm) S Both meter in and out, A l/min(1.7gpm) - B l/min(1.7gpm) S8 Both meter in and out, A l/min(1.gpm) - B l/min(1.gpm) S9 Only meter in, A 8l/min(1.8gpm) - B 8l/min(1.8gpm) ) I 1 Only meter in, A 1l/min(.17gpm) - B 1l/min(.17gpm) ) I Only meter in, A l/min(6.6gpm) - B l/min(6.6gpm) ) I Only meter in, A l/min(1.7gpm) - B l/min(1.7gpm) ) I 8 Only meter in, A l/min(1.gpm) - B l/min(1.gpm) ) I 9 Both meter in and out, A l/min(1.6gpm) - B 8l/min(1.8gpm) ) 1 Both meter in and out, A 8l/min(1.8gpm) - B 1l/min(.17gpm) ) 1 Both meter in and out, A 8l/min(1.8gpm) - B 16l/min(.gpm) ) 1 Both meter in and out, A 1l/min(.17gpm) - B 16l/min(.gpm) ) Both meter in and out, A 1l/min(.17gpm) - B l/min(6.6gpm) ) Both meter in and out, A 16l/min(.gpm) - B l/min(6.6gpm) ) Both meter in and out, A 16l/min(.gpm) - B l/min(1.7gpm) ) 8 Both meter in and out, A l/min(6.6gpm) - B l/min(1.7gpm) ) 8 Both meter in and out, A l/min(6.6gpm) - B l/min(1.gpm) ) 9 Both meter in and out, A l/min(1.7gpm) - B l/min(1.gpm) ) 89 Voltage supply Without coil 1V DC OB V DC OC Electric connections 8 Without coils With coils, without mating connector DIN EN ) With coils, without mating connector vertical Amp- Junior With coils, without mating connector DT-P 7 Ports 9 G /8 DIN 8 G 1/ DIN 8 /-16 UNF -B (SAE8) M ) Options 1 Without manual override Push-button type manual override P Screw type manual override F Lever type manual override ) = Available = Not available 1) The required hydraulic layout and spool variant can be chosen by consulting page. ) Available only for E_ spool variant. ) Each different option for the type of emergency chosen implies a specific ordering code (refer to page 8). ) With p (P > A or P > B) 1 bar ( psi). ) See RE181-, RE181-6, RE181-7, for flangeable elements. 6) For connectors ordering code see data sheet RE Symbols = = = = M Bosch Rexroth AG, RE 181-9/.16

3 / and / Proportional directional valve elements L88 (EDC-P) Ordering details Spool variant and Flow pattern Both meter in and out Only meter in =B =E =EI =B =E =EI =B =E =EI RE 181-9/.16, Bosch Rexroth AG

4 L88 (EDC-P) / and / Proportional directional valve elements Functional description Functional description A 6 B The sandwich plate design directional valve elements L88 are compact direct operated pressure compensated proportional solenoid valves which control the start, the stop, the direction and the quantity of the oil flow, with a FLOW SHARING principle. These elements basically consist of a stackable housing (1) with a control spool, two solenoids (), two return springs. Energized by an electronic feed regulator, each solenoid () displaces the control spool from its neutral-central position proportionally to the current received. When the spool is shifted and the metering notch is open, flow delivery starts and is controlled by a way pressure compensator followed by a check valve for each port A and B. The compensator, balanced by the LS pressure at the opposite end, lifts up and unloads a regulated flow which is sent to the A (or B) port through the relevant check valve; at the same time the opposite port allows oil return to tank. LS pressure reaches the compensator dead end directly from the A or B port, while the check valves lock eventual pressure oscillations which could affect the compensator function. When the solenoid is de-energized, the return spring pushes the spool thrust washer back against the housing and the spool returns in its neutral-central position. Each coil () is fastened to the solenoid tube by the ring nut (7). A pin allows to push the spool under emergency conditions, when the solenoid cannot be energized, like in case of voltage shortage. Bosch Rexroth AG, RE 181-9/.16

5 / and / Proportional directional valve elements L88 (EDC-P) Technical data Technical data General Valve element with solenoids kg (lbs).9 (8.71) Valve element with 1 solenoid kg (lbs).6 (7.91) Ambient Temperature C ( F)...+ (-...+1) (NBR seals) Hydraulic Maximum pressure at P, A and B ports bar (psi) 1 () Maximum pressure at T bar (psi) 1 () Maximum pressure with lever emergency at T bar (psi) 1 () Max. regulated flow at 1 bar ( psi) l/min (gpm) (1.) Max. regulated flow at 18 bar (61 psi) l/min (gpm) 8 (1.) 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 1 part 1). Mineral oil based hydraulic fluids HLP (DIN 1 part ). For use of environmentally acceptable fluids (vegetable or polyglycol base) please consult us. Fluid Temperature C ( F)...+8 ( ) (NBR seals) Permissible degree of fluid contamination ISO 7: β x 7 X=1...1 ISO 6: class 19/17/1 NAS 168: class 8 Viscosity range mm /s...8 (optimal...6) Electrical Voltage type PWM 1 Hz Voltage tolerance (nominal voltage) % Duty Continuous, with ambient temperature C (1 F) Coil wire temperature not to be exceeded C ( F) 1 () Insulation class H Compliance with Low Voltage Directive LVD 7//EC (6/9/EC), /18/EC Coil weight kg (lbs). (.79) Voltage V 1 Nominal 1% current A Coil resistance - Cold value Ω 16 (nominal at C (68 F)) - Max. hot value Ω 6.1. Note For applications with different specifications consult us Code Voltage [V] Connector type Coil description Marking Coil Mat no. =OB 1 1 DC EN (Ex. DIN 6) D1 1 1 DC R99 =OB 1 DC AMP JUNIOR D1 1 DC R9877 =OB 7 1 DC DEUTSCH DT -P D1 7 1 DC R99 =OC 1 DC EN (Ex. DIN 6) D1 1 DC R99 =OC DC AMP JUNIOR D1 DC R91 =OC 7 DC DEUTSCH DT -P D1 7 DC R9798 RE 181-9/.16, Bosch Rexroth AG

6 6 L88 (EDC-P) / and / Proportional directional valve elements Characteristic curves Characteristic curves Characteristic curves Q=Q (I) Nominal Flow = Δp=psi %A % of maximum control current Nominal Flow = Δp=psi %A % of maximum control current Nominal Flow = Nominal Flow = Δp=psi 16 Δp=psi %A 6 8 1%A % of maximum control current % of maximum control current Nominal Flow = 6 8 1%A % of maximum control current Δp=psi gpm l/min 6 1 Nominal Flow = %A % of maximum control current Δp=psi Nominal Flow = Δp=psi %A % of maximum control current The curves refer to the spool fully open. Measured with hydraulic fluid ISO-VG at ± C (11 ±9 F); ambient temperature C (68 F). Bosch Rexroth AG, RE 181-9/.16

7 / and / Proportional directional valve elements L88 (EDC-P) Characteristic curves 7 1,1 8 7 Nominal flow = Nominal flow = 8 1 Nominal flow = 8 Nominal flow = Nominal flow = 1 Nominal flow = 1 Nominal flow = 1 1 bar Pressure Δp Nominal flow Qnom=Qnom ( P ls) psi. 1 1 bar psi Pressure Δp Pressure differential across the spool (ΔPls) Pressure drop p = p(q) (P IN - P OUT ) to the next section section section section section 1 section 1 6 l/min gpm LS drain 1, 1,,8,6, 1, 1 1 bar 1 6 psi Pressure p Pressure drop p = p(q) with spool BS9 Pressure Δp psi 1 1 bar 1 1 P>A or P>B B>T or A>T 1 6 l/min gpm The curves refer to the spool fully open. Measured with hydraulic fluid ISO-VG at ± C (11 ±9 F); ambient temperature C (68 F). RE 181-9/.16, Bosch Rexroth AG

8 8 L88 (EDC-P) / and / Proportional directional valve elements External dimensions and fittings Dimensions [mm (inches)] External dimensions and fittings 1 Solenoid tube Ø mm (.91 inch). Plug for positions versions (/). Ring nut for coil locking (Ø. mm). Torque 6 7 Nm (.. ft-lb). Flange specifications for coupling to ED intermediate elements. For tie rod and tightening torque information see data sheet RE Clearance needed for connector removal. 7 A and B ports. 8 Identification label. 9 Optional push-button manual override, P type, for spool opening: it is pressure stuck to the ring nut for coil locking. Mat no. R Optional screw type manual override, F type, for spool opening: it is screwed (torque 6-7 Nm (.-. ft-lb)) to the tube as replacement of the coil ring nut. Mat no. R Four threaded holes M deepth 1mm (.7 inch) for fitting a secondary flangeable element. Bolts M with recommended strength class DIN8.8: torque -6 Nm (.6-. ft-lb) (only for version with modular secondary valves). Bosch Rexroth AG, RE 181-9/.16

9 Dimensions [mm (inches)] / and / Proportional directional valve elements L88 (EDC-P) External dimensions and fittings 9 1 Ordering Details: HA (if fitted to side A) or HB (if fitted to side B) Ordering Details: VA (if fitted to side A) or VB (if fitted to side B) Ordering Details: H1 (if fitted to side A) or H9 (if fitted to side B) Ordering Details: V1 (if fitted to side A) or V9 (if fitted to side B) Ordering Details: XA (if fitted to side A) or XB (if fitted to side B) 6 Ordering Details: X1 (if fitted to side A) or X9 (if fitted to side B) RE 181-9/.16, Bosch Rexroth AG

10 1 L88 (EDC-P) / and / Proportional directional valve elements Electric connection Electric connection Dimensions [mm (inches)] 1 Protection class: IP 6 when connector with seal is properly screwed down. Protection class: IP 6 with female connector properly fitted (see drawing). 7 Protection class: IP 69 K with female connector properly fitted (see drawing). Bosch Rexroth Oil Control S.p.A. Oleodinamica LC Division Via Artigianale Sedrio, 1 Vezzano sul Crostolo Reggio Emilia - Italy Tel Fax / 61 8 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 181-9/.16