4/3 Proportional directional valve elements L85P5 with proportional (EDC-IP) hydraulic control and flow sharing control (LUDV concept) PATENT PENDING

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1 / Proportional directional valve elements L8P with proportional (EDC-IP) hydraulic control and flow sharing control (LUDV concept) PATENT PENDING L8P (EDC-IP) RE 8- Edition:.6 Replaces: 7. Size 6 Series Maximum operating pressure bar ( psi) Maximum flow at bar ( psi) l/min (. gpm) Maximum flow at 8 bar (6 psi) 8 l/min (. gpm) Ports connections planned G /8 - G / - 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. Hydraulically direct operated spool. Hydraulic operating element bolted on. Hydraulic operating element available with inlet port: G/ DIN8; 9/6-8 UNF -B. The control spool is held in the central position by return springs. Contents Ordering details Functional description Technical data Characteristic curves 6 External dimensions and fittings 8 RE 8-/.6, Bosch Rexroth AG

2 L8P (EDC-IP) / Proportional directional valve elements Ordering details Ordering details 6 7 L 8 P Family Directional Valve elements ED L Type Size 6 proportional 8 Configuration Flow Sharing Operation type Direct hydraulic proportional P Spool variants / operated on both sides a and b; 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 ) - ) Flow pattern & Nominal flow 6 Both meter in and out, A l/min(,6gpm) - B l/min(,6gpm) S Both meter in and out, A 8l/min(,8gpm) - B 8l/min(,8gpm) S Both meter in and out, A l/min(,7gpm) - B l/min(,7gpm) S Both meter in and out, A 6l/min(,gpm) - B 6l/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(,7gpm) - B l/min(,7gpm) S8 Both meter in and out, A l/min(,gpm) - B l/min(,gpm) S9 Only meter in, A 8l/min(,8gpm) - B 8l/min(,8gpm) I Only meter in, A l/min(,7gpm) - B l/min(,7gpm) I Only meter in, A l/min(6,6gpm) - B l/min(6,6gpm) I Only meter in, A l/min(,7gpm) - B l/min(,7gpm) I8 Only meter in, A l/min(,gpm) - B l/min(,gpm) I9 Both meter in and out, A l/min(,6gpm) - B 8l/min(,8gpm) Both meter in and out, A 8l/min(,8gpm) - B l/min(,7gpm) Both meter in and out, A 8l/min(,8gpm) - B 6l/min(,gpm) Both meter in and out, A l/min(,7gpm) - B 6l/min(,gpm) Both meter in and out, A l/min(,7gpm) - B l/min(6,6gpm) Both meter in and out, A 6l/min(,gpm) - B l/min(6,6gpm) Both meter in and out, A 6l/min(,gpm) - B l/min(,7gpm) 8 Both meter in and out, A l/min(6,6gpm) - B l/min(,7gpm) 8 Both meter in and out, A l/min(6,6gpm) - B l/min(,gpm) 9 Both meter in and out, A l/min(,7gpm) - B l/min(,gpm) 89 Ports 7 G /8 DIN 8 G / DIN 8 /-6 UNF -B (SAE8) Machined to interface modular elements M ) ) The required hydraulic layout and spool variant can be chosen by consulting page. ) See RE8-, RE8-6, RE8-7, for flangeable elements. ) With p (P > A or P > B) bar ( psi). Symbols = = = = M Bosch Rexroth AG, RE 8-/.6

3 / Proportional directional valve elements L8P (EDC-IP) Ordering details Spool variant and Flow pattern Both meter in and out =B =E Only meter in =BI =EI RE 8-/.6, Bosch Rexroth AG

4 L8P (EDC-IP) / Proportional directional valve elements Functional description Functional description A 6 B The sandwich plate design directional valve elements L8P... are compact direct hydraulic operated pressure compensated proportional valves which control the start, the stop, the direction and the quantity of the oil flow, with FLOW SHARING principle. These elements basically consist of a stackable housing () with a control spool (), two hydraulic operating blocks (), and two return spring return (). The hydraulic pressure in one of the blocks () pushes the control spool () from its neutral-central position "" to the required end position "a" or "b". 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 pressure decrease in one of the block (), the return spring () pushes the spool thrust washer back against the housing and the spool returns in its neutralcentral position. Bosch Rexroth AG, RE 8-/.6

5 / Proportional directional valve elements L8P (EDC-IP) Technical data Technical data General Valve element with hydraulic controls kg (lbs). (6.7) Ambient Temperature C ( F)...+ (-...+) (NBR seals) Hydraulic Maximum pressure at P, A and B ports bar (psi) () Maximum pressure at T to prevent damages bar (psi) () Reccomended maximum pressure at T during operation bar (psi) () Max. pilot pressure bar (psi) (8) Min. pilot pressure refer to page 6 Max. regulated flow at bar ( psi) l/min (gpm) (.) Max. regulated flow at 8 bar (6 psi) l/min (gpm) 8 (.) E-schemes flow pattern symmetrical closed pass in the neutral position (connection from A to T and B to T) Approx. % of the nominal cross-section 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 ). Mineral oil based hydraulic fluids HLP (DIN 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=... ISO 6: class 9/7/ NAS 68: class 8 Viscosity range mm /s...8 (optimal...6) Note For applications with different specifications consult us RE 8-/.6, Bosch Rexroth AG

6 6 L8P (EDC-IP) / Proportional directional valve elements Characteristic curves Characteristic curves Nominal Flow =.6 6. Δp=6psi. Δp=psi Δp= bar bar psi Nominal Flow =. Δp=6psi. 8 Δp=psi. Δp= bar bar psi Nominal Flow =.7 8 Δp=6psi Δp=psi Δp= bar bar psi gpm 6. 6 l/min Nominal Flow = 6 Δp=6psi Δp=psi Δp= bar bar psi Nominal Flow = Δp=6psi Δp=psi Δp= bar bar psi gpm l/min Nominal Flow = 8 6 Δp=6psi Δp=psi Δp= bar bar psi Nominal Flow = 9.8 Δp=6psi 6 8 Δp=psi Δp= bar bar psi The curves refer to the spool fully open. Measured with hydraulic fluid ISO-VG at ± C ( ±9 F); ambient temperature C (68 F). Bosch Rexroth AG, RE 8-/.6

7 / Proportional directional valve elements L8P (EDC-IP) Characteristic curves 7, 8 7 Nominal flow = Nominal flow = 8 Nominal flow = 8 Nominal flow = Nominal flow = Nominal flow = Nominal flow = bar Pressure Δp Nominal flow Qnom=Qnom ( P ls) psi. 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 section 6 l/min gpm LS drain,,,8,6,, bar 6 psi Pressure p Pressure drop p = p(q) with spool BS9 Pressure Δp psi bar P>A or P>B B>T or A>T 6 l/min gpm The curves refer to the spool fully open. Measured with hydraulic fluid ISO-VG at ± C ( ±9 F); ambient temperature C (68 F). RE 8-/.6, Bosch Rexroth AG

8 8 L8P (EDC-IP) / Proportional directional valve elements External dimensions and fittings Dimensions [mm (inches)] External dimensions and fittings Hydraulic operating element available with inlet port: G/ DIN8; 9/6-8 UNF -B (SAE6) Flange specifications for coupling to ED intermediate elements. For tie rod and tightening torque information see data sheet RE 8-9 A and B ports. Identification label. 6 Four threaded holes M deepth mm [.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 Oil Control S.p.A. Oleodinamica LC Division Via Artigianale Sedrio, Vezzano sul Crostolo Reggio Emilia - Italy Tel Fax / 6 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 8-/.6