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RE 64299/05.2014, Bosch Rexroth AG
Features ▶ Closed center for variable displacement pump with
residual amount ▶ Integrated replenishment valves ▶ Unloading function for
– Improved response behavior – Reduction of switch-off peaks – Flushing and cooling – Little risk of cavitation
▶ Priority supply of the steering hydraulics ▶ Brake accumulator charging function ▶ Parking brake function ▶ Cold start function
Design ▶ Multi-function inlet element ▶ Directional valve M7-22 ▶ End plate ▶ Operating method parking brake and cold start
– Electrical ▶ Operating method directional valve M7-22
– Hydraulic
Fields of application ▶ Dumpers
▶ Size 22 ▶ Series 3X ▶ Maximum operating pressure
– On the pump side 380 bar – On the actuator side 420 bar
▶ Maximum flow volume – On the pump side 350 l/min
RE 64299Edition: 05.2014
ContentsFunctional description 2Technical data 3Characteristic curves 4Ordering code 5Symbol 9Dimensions 10Project planning information 12Related documents 12
LUDV control block for dumpersM7-22
Bosch Rexroth AG, RE 64299/05.2014
2 M7-22 | Control blockFunctional description
Functional description
Multi-function inlet elementThe inlet element has three main functions:
1st main function: Charging the brake accumulatorHere, the pressure of the main brake accumulators and the accumulator for the parking brake is charged and maintained. The parking brake is operated by means of an electrical signal. Separating the two main accumulator strands ensures that in case of draining caused e.g. by a burst hose, a brake pressure is made available at the other accumulator strand via the control block. The LS message due to empty accumulators upon motor start is prevented by means of an electrically controllable valve.
2nd main function: SteeringThe supply of the steering with flow takes priority over the supply of the work hydraulics and depends on the require-ment signal of the steering.
Possible signal manipulation into the control block caused by the external emergency steering pump is prevented. A dynamic nozzle prevents a signal delay in case of steering request caused by a "detour" of the signal via the steering. The steering is separately protected against overpressure.
3rd main function: TroughSupply via an attached standard directional valve M7-22 with flow, depending on the control pressure. More infor-mation is available in data sheet 64295.
Ancillary functions ▶ Constant generation of an adjustable pilot pressure ▶ Protection of the system by means of
– LS pressure cut off – Primary pressure relief valve
▶ Absorption of pressure peaks caused by the environment
▼ Functions at the dumper control block
Cold start valve
Multi-function inlet element
Parking brake valve
Trough section
RE 64299/05.2014, Bosch Rexroth AG
Control block | M7-22 Technical data
3
Technical data
general
Weight kg 49
Installation position Any
Type of actuator connection Flange connection similar to DIN EN ISO 6162
Ambient temperature range θ °C –20 to +80
Priming RAL 1014
hydraulic
Maximum operating pressure at port
P p bar 380
A, B p bar 420
LS p bar 330
T p bar 30
Maximum pilot pressure at port
pST p bar 40
a, b p bar 40
Maximum accumulator pressure at port
S1, S2, S3 p bar 200
S p bar 240
Maximum flow at port
P qv max l/min 280
A, B qv max l/min 280 (at ∆p block inlet P – LS = 19 bar)
Hydraulic fluid Mineral oil (HL, HLP) according to DIN 51524, other hy-draulic fluids, such as HEES (synthetic esters) according to VDMA 24568, as well as hydraulic fluids as specified in data sheet RE 90221, upon request
Hydraulic fluid temperature range θ °C –20 to +80
Viscosity range ν mm²/s 10 to 380
Maximum admissible degree of contamination of the hydraulic fluid, cleanliness class according to ISO 4406 (c)
Class 20/18/15, for this, it is recommended to use a fil-ter with a minimum retention rate of β10 ≥ 75
Recommended hydraulic pilot control units Type 4 TH6…; characteristic curve 70, see data sheet 645552 TH6 R…; characteristic curve 70, see data sheet 64552
electric
2/2 directional seat valve KSDE U for parking brake/cold start See data sheet 18136-12
Notice ▶ For applications outside these parameters, please
consult us. ▶ The technical data were determined at a viscosity of
ν = 32 mm²/s (HLP46: 50 °C).
Bosch Rexroth AG, RE 64299/05.2014
4 M7-22 | Control blockCharacteristic curves
Characteristic curves
▼ Steering
200
25 12550 75 150 225 250175100 2000 275
175
150
125
100
75
50
25
0
Flow [l/min]
Stee
ring
pre
ssur
e [b
ar]
▼ Brake
50
40
25 12550 75 150 175100 2000
30
20
10
0
Accumulator pressure [bar]
Flow
[l/
min
]
▼ Typical trough
5 2510 15 30200
300
250
200
150
100
50
0
Pilot pressure [bar]
Flow
[l/
min
]
RE 64299/05.2014, Bosch Rexroth AG
Control block | M7-22 Ordering code
5
Ordering code
ExplanationsThe ordering code documents the default functional features of the valve series which is set-up as a modular system. This series consists of a multi-function inlet ele-ment at the front side of which an LUDV directional valve with corresponding end plate has been attached.In the first part of the ordering code (features of the overall control block), the available detail features and settings of the block are defined.
In the second part of the ordering code, you must select the corresponding features for the spool axis. Complete specification of all features is the prerequisite for the fast and clear processing of an order. In case of questions, please contact the relevant application specialist in the sales-related product management.
Design
Multi-function inlet element
Directional valve M7-22
End plate
Bosch Rexroth AG, RE 64299/05.2014
6 M7-22 | Control blockOrdering code
Information on the name plateThe ordering code serves to specify the technical features and requirements. The Rexroth distribution organization derives a short type as well as a material number from the ordering code.
01 02 03 04 05 06 07 08 09
M7 – . . . . – 3X / 1 M7 – 22 / 1 H / V 11 *
Series01 LUDV control block M7 M7
02 4-digit control block number . . . .
Series03 30 to 39 (unchanged installation and connection dimensions) 3X
04 Total number of spool axes 1
Design05 Multi-function inlet element 1
Type of actuation06 Hydraulic H
Seal material07 FKM seals (preferably) V
Consumer ports08 Flange connection similar to DIN EN ISO 6162 11
09 Further details in the plain text *
RE 64299/05.2014, Bosch Rexroth AG
Control block | M7-22 Ordering code
7
Overall control block features
01 02 03 04 05 06 07 08
M7-22 / – –
Primary pressure limitation 01 02 03
01 Without Q 000 000
Pressure relief valve, pilot operated (MHDBV, see data sheet 64642) V … 000
Pressure/feed valve with pressure sequencing stage (MHDBB, see data sheet 64642) B … …
02 Specified pressure of the pressure relief valve (in bar, 3-digit) …
03 Specified pressure of the pressure sequencing stage (in bar, 3-digit) …
LS pressure limitation 04 05 06
04 Without Q 000 000
Pressure relief valve, directly operated (MHDBD 04, see data sheet 64642) S … 000
Pressure relief valve, directly operated with pressure sequencing stage (MHDBZ) A … …
05 Specified pressure of the pressure relief valve (in bar, 3-digit) …
06 Specified pressure of the pressure sequencing stage (in bar, 3-digit) …
Accumulator charging valve07 Cut-off pressure (max. 200 bar), specification in bar, 3-digit1) …
Parking brake function08 Without Z
Electric E
1) The sequencing pressure is approx. 12 % below the cut-off pressure
Bosch Rexroth AG, RE 64299/05.2014
8 M7-22 | Control blockOrdering code
2) The gear ratio of hydraulic cylinders must be specified in plain text as E and Q spools have supply and outlet characteristic curves. Further spool types on demand.
3) Functional description in plain text4) With measuring port5) See "Line connections" on page 10
Directional valve M7-22 design
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19
M7-22-3X / 1 – H H
01 Number of the spool axis 1
Spool type2)
02 Control spool A/B/T blocked in neutral position E
Control spool A/B→T blocked in neutral position J
Control spool A/B→T throttled to the tank in neutral position Q
Control spool P/B→A in spool position b R
Extra spool3) S
Flow03 Actuator port A (in l/min, 3-digit) …
04 Actuator port B (in l/min, 3-digit) …
Load holding05 Without Z
With load holding (both sides) L
Pressure compensator06 Direct operated D
Pilot operated V
A side B side
Type of actuation 07 08 09 10 11 12
07, 10 Hydraulic4) H H
08 11
Shuttle Without shuttle 00 00
With shuttle 0.3 mm 03 03
With shuttle 0.5 mm 05 05
With shuttle 0.6 mm 06 06
With shuttle 0.8 mm 08 08
09 12
Pilot oil port position Axial A A
Radial R R
Pilot oil port with hydraulic actuation5)
13 Poppet seal G
O-ring seal O
G 1/4 without adapter (only with H00) Z
A side B side
Secondary valves 14 15 16 17 18 19
1417
Without Z 000 000 Z 000 000
Feed valve (MHSV 22, see data sheet 64642) E 000 000 E 000 000
Pressure/feed valve (MHDBN 22, see data sheet 64602) H … 000 H … 000Pressure/feed valve with pressure sequencing stage (MHDBB 22, see data sheet 64642)
B … … B … …
15, 18 Specified pressure of the pressure/feed valve (in bar, 3-digit) … …
16, 19 Specified pressure of the pressure sequencing function (in bar, 3-digit) … …
RE 64299/05.2014, Bosch Rexroth AG
Control block | M7-22 Symbol
9
Symbol
Control block (example)
A
B
a
P T
MT
MS
S
SX
MLS
MSP
MSX
MBR3
BR3
S3S2S1BR
Pst
L
LS
MP
PSTa
PSTb
b
◀ Multi-function inlet element
◀ Directional valve M7-22
◀ End plate
Bosch Rexroth AG, RE 64299/05.2014
10 M7-22 | Control blockDimensions
Dimensions [mm]
Dimensions
Line connections
Connection Dimension Similar standard
P DN 32 (SAE 1 1/4 in 6000 PSI) DIN ISO 6162-2
T DN 32 (SAE 1 1/2 in 3000 PSI) DIN ISO 6162-1
A, B DN 25 (SAE 1 in 6000 PSI) DIN ISO 6162-2
LS
M14 × 1.5 DIN 3852-1, form X
PST
M..
SX
L
BR3
a, b
G 1/4 (version Z) DIN EN ISO 1179
11
M16
x1.5 Poppet seal (version G):
L10 according to DIN EN ISO 8434
11/1
6-16
UN
2A
11.5
O-ring seal (version O):SAE J 1453-3
PSTa, PSTb
G 1/4 ISO 1179BR
MSP
S M33 × 1.5 DIN 3852-1, form X
S1, S2, S3 M18 × 1.5 DIN 3852-1, form X
Connections
P Pump
T Tank
A, B Actuator
LS Load sensing
L Leakage oil connection (depressurized to the tank)
M.. Measuring ports
MSP Sensor connection pump pressure
a, b Pilot oil port
BR Sensor connection accumulator charging pressure
BR3 Parking brake
S Steering
S1, S2 Main accumulator
S3 Accumulator parking brake
SX Inlet of the control signal of the steering
PST Output pilot pressure provisioning
RE 64299/05.2014, Bosch Rexroth AG
Control block | M7-22 Dimensions
11Dimensions [mm]
▼ Example of hydraulic actuation
(464.8)
244
12252
58
18 25
56 106.
512
1 142
153 19
1 212
227
240
241
257.
526
628
048
93 102
120
232.
513
2.25
100.
593
18
168
192
187
194154
9864
50
MP
A B
MT
PST
PSTa
a
PSTb
b
S
MSP
MSMLS
LS
LS
S2
S3S1SX
MSX
BR
BR3 MBR3
SX
P
T
153134113
5653
303.5257
227
12711511290
76
212155143
595612
110.4 110.4102.6102.6
1 2 3
6
7
8
9
4 5
1 Pressure cut off LS2 Valve steering3 Pressure cut off SX4 LS unloading5 Primary valve
6 Cold start valve7 Accumulator charging valve8 Parking brake valve9 Priority valve
12
Bosch Rexroth AG, RE 64299/05.2014
Bosch Rexroth AGMobile ApplicationsZum Eisengießer97816 Lohr am Main, GermanyPhone +49 9352 [email protected]
© This document, as well as the data, specifications and other information set forth in it, are the exclusive property of Bosch Rexroth AG. 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.
M7-22 | Control blockProject planning information
Project planning information
The control block is the core component of the hydraulic control of a mobile working machine. It is therefore rec-ommended to only specify it in connection with an overall hydraulic circuit diagram.For the design of a hydraulic control block, the following boundary conditions are relevant for project planning and should be enclosed to the enquiry:
▶ Machine type ▶ Pump flow at rated speed ▶ Type of pump control ▶ Description of the actuator on the sections
(e.g. boom, winch) ▶ Cylinder ratios/displacement of the motor ▶ Information on whether a system element is installed
downstream of the valve (e.g. hose burst check valve, lowering brake valve)
▶ Information on the loads (pressures) to be throttled per axis if there is no braking valve or similar
Related documents
The control blocks are system components.Also observe the instructions for the other system components. Do not commission the product until you are provided with the following documentation and have under-stood and observed it.
Title Document number Document type
Control blocks for mobile applications 64025-B Operating instructions
System documentation from the machine manufacturer Operating instructions
