Compact Valve Block. Overview of contents. Features. RE / /16 Replaces: Type M8

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1 Industrial Hydraulics Electric Drives and ontrols inear Motion and ssembly echnologies Pneumatics Service utomation Mobile Hydraulics ompact Valve lock RE 4 94/0.03 / Replaces: 0.94 ype M8 Nominal size...3 Series X Maximum control pressure: pump side 30 bar actuator side 4 bar Maximum flow x 40 /min H/ 0 ompact valve block M8 (view from above) H/ 0 ompact valve block M8 (view from below) Overview of contents Features ontents Page Features echnical features Function, circuit diagram for excavator valve block 3 Installation and service notes 4 echnical data 4 Operating urves 4 to Spool selection, Port sizes Unit dimensions 8 to Primary and secondary valves ompact valve blocks, series M8 are primarily used for the control of standard functions in track driven and wheeled excavators, such as arms, buckets, transmission, dipper and slew (swing) within a circuit hydraulic system. hey may even be usefully used in drilling devices and cranes. ompact valve block M8 replaces the previous 4 axis valve blocks in circuit controls. he advantage of this type over a separated design lies in the reduced time and effort required for assembly and piping.

2 / osch Rexroth G Mobile Hydraulics M 8 RE 4 94/0.03 echnical features Valve control to the /3 way principle Proportional control characteristic Further fine control range for sensitive flow control Hydraulic control by means of pilot operated device type H, electrical control available on request Spool axes: for size min. 8 to max.0 for size 8 min. to max. 9 for size for size for size 3 min. to max. 8 Various circuit variations (parallel/tandem/series) Simultaneous control of various actuators possible Internal flow summation of max. 3 actuators (Other actuators possible externally) Spools for track transmission controls with integrated deceleration functions Priority circuit for slew operation Flange mountable flow divider with compensator valve for transmission spool axes, ports for tank, cooler and anticavitation Various primary and secondary cartridge valves Spool stroke, control characteristics he spool stroke is divided into appox. 30 % control land overlap, approx. 0 % fine control range and approx. % residual stroke for creating fully opened cross-section. Optimum fine control is achieved by means of the fine control grooves in the pilot devices. Deceleration spool hese are used in hydrostatic transmissions in tracked vehicles and are used to avoid the over-running of the drive in both directions of travel. ontrolled, cavitation-free downhill travel is achieved by control of the return oil opening dependent on the feed pressure. Warning: For the deceleration spool to funtion correctly system optimisation must be carried out on the vehicle. efore going into series production, the valve must be tested in situ and final installation certified as being correct! Ordering ode Project department together with the customer will specify the ordering code for the valve blocks of series M8.

3 RE 4 94/0.03 M 8 Mobile Hydraulics osch Rexroth G 3/ Function, circuit diagram for excavator valve block he block mainly comprises the housing, the control spool with return springs (), built-in primary cartridge valves (3) and secondary cartridge valves (4), as well as load holding valves (). onnected to pump P () are usually arm (, spool axis ) and bucket (3, spool axis ), as well as transmission (4, spool axis 3). rm and bucket may be supplied with fluid either in parallel or in series, i.e. both functions may be carried out simultaneously. If these functions are not used, the pump flow is available for control of the transmission. Pump () usually supplies the slew (, spool axis ), dipper (, spool axis ) and transmission R (, spool axis ). he slew has priority over the dipper and transmission (tandem circuit). he dipper function has priority over the transmission. Flow from pump not required for these functions may [by operating the valve (0)] be used for the external summation with another actuator. If neither arm, bucket nor transmission (spool axes -3) are operated, flow from pump P may be made available by internally activating the summation valve (9) of spool axis (control of dipper) (dipper summation). y means of the transmission compensation valve () the remaining of oil from pumps P and may be combined for the supply of both spool axes for the transmisssions. Hence various operations may be carried out during travel, without the vehicle deviating from its path of travel. If only the transmission spools are operated, the transmission compensation valve is then at rest and only a residual compensation is carried out. Preload valves () arranged in the return cause the return oil to be divided between the cooler and tank. he return oil which has built up may only be removed via port S and then fed to the slew motor for the purpose of anti-cavitation. In addition to the model of the compact valve block described here, further variations exist, which our project department MH-V is willing to provide information on. Similary help is provided for the design of hydraulic controls using M8 valve blocks. 3 8 ' a a a b b b 4 0 Pst S 4 3 K ontrol spool oad holding valve 3 Primary valve 4 Secondary valve Port for pump Port for pump ransmission compensation valve with residual oil at rest 8 Spool with integrated deceleration function 9 Summation valve (internal, dipper summation) 0 valve external summation Preload valves S Port: arm K 3 Port: spoon 4 Port: left transmission Port: right transmission M Port: dipper Port: slew (swing) P; pump ports Pst, a., b. control ports anti-cavitation port cooler port tank port leakage oil port pressure gauge port Port for external summation a a M b b P 3 9

4 4/ osch Rexroth G Mobile Hydraulics M 8 RE 4 94/0.03 Installation and service notes Installation he installation position of the compact valve block is optional. Mechanical distortion is not permissible. Service notes Primary and secondary valves may be exchanged without disassembling block. hey must not be adjusted by the customer. If a control spool needs to be removed, only the long cover of the spool axis needs to be removed first. echnical data (For operation outside these parameters, please consult us!) Fluid Mineral oil (H, HP) to DIN 4 Phosphate ester (HFD-R) Fluid temperature range to + 80 Viscosity range mm /s 0 to 380 Degree of contamination of fluid (maximum permissible) ISO 440 () lass /8/ Flow, max. Size 8 3 /min x 0 x 0 ) x 0 ) x 30 x 300 x 40 Operating pressure pump side bar 30 (maximum) actuator side bar 4 tank side bar 30 leakage oil bar ow pressure ontrol pressure, max. bar 30 Fine control range bar for control curve for control curve 0 (for suitable pilot units see RE 4, RE 4 and RE 4 8) Other control curves on enquiry Weight See Unit dimensions on pages 8 - (approx. weights) Exact weight will depend on the equipment used. ) with brake piston 00 ) without brake piston Operating urves (measured at ν = 4 mm /s and ϑ = 0 ) Size hrough flow resistance P actuator P 3 P 0 hrough flow resistance actuator tank / / 0 ypass resistance Q Q 9 3 P Q

5 RE 4 94/0.03 M 8 Mobile Hydraulics osch Rexroth G / Operating urves (measured at ν = 4 mm /s and ϑ = 0 ) Size 8 hrough flow resistance P actuator hrough flow resistance actuator tank P 3 P 9 3 / / 0 ypass resistance Q Q 9 3 P Size Q hrough flow resistance P actuator hrough flow resistance actuator tank 0 P ) 3 3 P 0 / / Q ypass resistance Q ) for brake piston P Q

6 / osch Rexroth G Mobile Hydraulics M 8 RE 4 94/0.03 Operating urves (measured at ν = 4 mm /s and ϑ = 0 ) Size 0 hrough flow reistance pump actuator P 0 4 hrough flow resistance actuator tank ypass resistance 300 Q Q 0 P Size 3 hrough flow resistance pump actuator 300 Q P 4 4 P hrough flow resistance actuator tank / / Druckdifferenz in bar ypass resistance Q P Q Q

7 RE 4 94/0.03 M 8 Mobile Hydraulics osch Rexroth G / Spool selection Symbols = available Port sizes = 00 = 00 = 003 = 00 = 00 = 00 = 009 = 0 = = 39 = 49 Size Size8 Size Size Size 3 Port Size Size 8 Size Size Size 3,,, ' M x SE 3/4" 000 PSI SE 3/4" 000 PSI SE " 000 PSI SE /4" 000 PSI, M33 x SE" 000 PSI SE " 000 PSI SE /4" 000 PSI SE /4" 000 PSI P, SE 3/4" 000 PSI SE " 000 PSI SE " 000 PSI SE " 000 PSI SE /4" 000 PSI K SE " 3000 PSI SE /4" 3000 PSI SE /4" 3000 PSI SE /" 3000 PSI SE " 3000 PSI SE " 3000 PSI SE /" 3000 PSI SE /" 3000 PSI SE " 3000 PSI SE /" 3000 PSI a, b, /4" SP /4" SP /4" SP /4" SP /4" SP Pst /4" SP /4" SP /4" SP /4" SP M /4" SP /4" SP M x, M x, M x, S M x, M33 x M33 x M 0x, 3,9±0, M x,8±0, M 4x9 3,±0, M 0x4 30,±0, M x 3,±0, M x8 4,9±0, M x8 0,9±0, 0,8±0,,±0,,±0, 8,4±0, 9,8±0,,8±0, 88,9±0, SE 3/4" 000 PSI SE " 000 PSI SE /4" 000 PSI SE /4" 3000 PSI SE /" 3000 PSI SE " 3000 PSI SE /" 3000 PSI

8 8/ osch Rexroth G Mobile Hydraulics M 8 RE 4 94/0.03 Unit dimensions: M8-, variation, and 3 (Dimensions in mm) For dimensions see page Variation 3 (basic block with -axis extension) b0 M3 P3 a0 P3 Weight: approx. 3 kg 4. b9 9 a9 0 Variation (basic block with single axis extension) 4. b M3 P3 a9 8 0 P3 Weight: approx. 9 kg Variation (extendable) , 83, 0 40 Weight: approx. 90 kg, M M; b8 a8 0 b b a a 0 b a S K b a 0 b a 0 4, 98 M P M; 8 80 ±0, 84, 0 9 leed 0 Nameplate 3 lanking plate (only variation ) 4. Extension piece (single axis) 4. Extension piece (-axis) ransport aid 3 30 Pisten stroke limitation Mounting bores

9 RE 4 94/0.03 M 8 Mobile Hydraulics osch Rexroth G 9/ Unit dimensions: M8-8, variation (Dimensions in mm) For dimensions see page -axis valve block (not extendable) Weight: approx. kg Pst S K 8 4, 9, xM; 8 30 S 3 38 /K 39 3, 3 4, 4 3,,, 3, 9 a a a a a M b b b b b 3±0, 80 8, 33 P 4, 33, 0 leed Nameplate 3 lanking plate (only Variation ) 4. Extension piece (single axis) 4. Extension piece (-axis) ransport aid Pisten stroke limitation Mounting bores 4,

10 0/ osch Rexroth G Mobile Hydraulics M 8 RE 4 94/0.03 Unit dimensions: M8-8, variation ; 3 and 4 (Dimensions in mm) Variation 4 (basic block with -axis extension) b9 M a9 90 For dimensions see page Weight: approx. 40 kg b8 a8 4. Variation 3 (basic block with single axis extension), 9 0 M; 80 Weight: approx. kg 0 33, 33 b8 M a , 0 M; Variation (extendable), Weight: approx. kg 0 33, 4 3 M; M 0,9 33 M b a b a 93 b a 4 0 4, b a, b a 9, 39 P M, 43 4 M; P 3, For explanations of items see page 9

11 RE 4 94/0.03 M 8 Mobile Hydraulics osch Rexroth G / Unit dimensions: M8-, variation (Dimensions in mm) -axis valve block (not extendable) For dimensions see page Weight: approx. 48 kg 3 P st S K 80 8, M; 8 49 ±0, 30 S 3 380, 98 3,,, 3, a a a a a 8 ' b b b b b 3±0, 4, 04 39,8±0, M P ,±0, M; 0 M; 4 leed Nameplate ransport aid Pisten stroke limitation Mounting bores

12 / osch Rexroth G Mobile Hydraulics M 8 RE 4 94/0.03 Unit dimensions: M8-, variation (Dimensions in mm) -axis valve block (not extendable) For dimensions see page Weight: approx. 0 kg P st S K 0, M; 84±0, M; 3 8±0, ±0, 49 3, 30, a a a a a xM/ 3 D , b b b b b ±0, P 03,, E P 38, ±0, M; 4 leed Nameplate ransport aid Mounting bores

13 RE 4 94/0.03 M 8 Mobile Hydraulics osch Rexroth G 3/ Unit dimensions: M8- (Dimensions in mm) -axis valve block (not extendable) For dimensions see page Weight approx. 8 kg P st K , M; ' 3 9, a a a a 3 b b b b P 0, 4,,8±0, M P ,±0, 0 M; leed Nameplate ransport aid Mounting bores

14 4/ osch Rexroth G Mobile Hydraulics M 8 RE 4 94/0.03 Unit dimensions: M8-3, variation (Dimensions in mm) -axis valve block (not extendable) *) For dimensions see page Weight approx. 3 kg , 80 M; ' a a a 3 ' b b b 0 K, K 4 M; 30 M P a a, M P 3, b b M; 30 4 M4 80 *) Dimensions for -axis valve block on request leed Nameplate ransport aid Mounting bores

15 RE 4 94/0.03 M 8 Mobile Hydraulics osch Rexroth G / Unit dimensions: M8-3, variation (Dimensions in mm) For dimensions see page 8-axis valve block (not extendable) Weight approx. 30 kg , M; 30 0 ' 9 ' a8 b8 a 8 3 K, a b a b a b 00 b 09 0 K M; a b, M M 9 leed Nameplate P ransport aid Mounting bores 38 M; 30 4 M4 P 80 3,

16 / osch Rexroth G Mobile Hydraulics M 8 RE 4 94/0.03 Primär- und Sekundärventile Primary valves available: Pressure relief valve, pilot operated, without anti-cavitation Pressure control/anti-cavitation valve, pilot operated Pressure control/anti-cavitation valve pilot operated with pressure isolation stage Pressure relief valve pilot operated with pressure isolation stage Secondary valves available: Pressure relief valve, pilot operated without anti-cavitation Pressure control/anti-cavitation valve, pilot operated nti-cavitation valve Pressure relief valve with pressure isolation stage (off) Pressure relief valve with pressure isolation stage (on) Project department will be pleased to provide information on the availability and application possibilities for these valves for the various sizes of compact block series M8. osch Rexroth G Mobile Hydraulics Zum Eisengießer 98 ohr am Main, Germany elefon +49 (0) elefax +49 (0) documentation@boschrexroth.de 03 by osch Rexroth G, Mobile Hydraulics, D-983 ohr am Main ll rights reserved. No part of this document may be reproduced or stored, processed, duplicated or circulated using electronic systems, in any form or by any means, without the prior written authorisation of osch Rexroth G. In the event of contravention of the above provisions, the contravening party is obliged to pay compensation. he data specified above only serves to describe the product. No statements concerning a certain condition or suitability for a certain application can be derived from our information.he details stated do not release you from the responsibility for carrying out your own assessment and verification. It must be remembered that our products are subject to a natural process of wear and ageing.