Bosch WPH User manual

ProductName
ProductDescription
DocumentType
Product Picture Product Picture Product Picture
FigureCaption_Cover FigureCaption_Cover FigureCaption_Cover
RE 24851-B/06.09
English
3/2, 4/2 and 4/3 directional valves
pilot operated
Type WPH, WHH, WMMH, WMDH, WMDAH, WMRH, and WMUH
3WPH10
3WPH16
3WPH22
3WPH25
3WPH32
3WHH10
3WHH16
3WHH22
3WHH25
3WHH32
3WM.H10
3WM.H16
3WM.H22
3WM.H25
3WM.H32
4WPH10
4WPH16
4WPH22
4WPH25
4WPH32
4WHH10
4WHH16
4WHH22
4WHH25
4WHH32
4WM.H10
4WM.H16
4WM.H22
4WM.H25
4WM.H32
H-3WPH10
H-3WPH16
H-3WPH22
H-3WPH25
H-3WPH32
H-3WHH10
H-3WHH16
H-3WHH22
H-3WHH25
H-3WHH32
H-3WM.H10
H-3WM.H16
H-3WM.H22
H-3WM.H25
H-3WM.H32
H-4WPH10
H-4WPH16
H-4WPH22
H-4WPH25
H-4WPH32
H-4WHH10
H-4WHH16
H-4WHH22
H-4WHH25
H-4WHH32
H-4WM.H10
H-4WM.H16
H-4WM.H22
H-4WM.H25
H-4WM.H32
.WPH10...QM
.WPH16...QM
.WPH22...QM
.WPH25...QM
.WPH32...QM
.WHH10...QM
.WHH16...QM
.WHH22...QM
.WHH25...QM
.WHH32...QM
.WM.H10...QM
.WM.H16...QM
.WM.H22...QM
.WM.H25...QM
.WM.H32...QM
Operating instructions
tb0253+0254
Applies to the following types:

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 obliga-
tion of own judgment and verification. It must be
remembered that our products are subject to a
natural process of wear and aging.
© This document, as well as the data, specifica-
tions 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 cover page shows an example configuration.
The product supplied may therefore differ from the
photo shown.
The original operating instructions were prepared
in German.

RE 24851-B/06.09 | W.H; WM.H Bosch Rexroth AG 3/40
Contents
Contents
1 About this document ......................................................................................5
1.1 Related documents ...................................................................................6
2 General safety instructions............................................................................6
2.1 Intended use .............................................................................................7
2.2 Improper use .............................................................................................7
2.3 Qualification of personnel .........................................................................7
2.4 Safety instructions in this document .........................................................8
2.5 Adhere to the following instructions ..........................................................8
2.6 Obligations of the operator......................................................................10
2.7 Safety labels ...........................................................................................11
2.8 Safety equipment ....................................................................................11
3 Scope of delivery ..........................................................................................11
4 Product description ......................................................................................12
4.1 Performance description .........................................................................12
4.2 Device description...................................................................................12
4.3 Product identification...............................................................................12
5 Transport and storage ..................................................................................14
5.1 Transport by hand ...................................................................................15
5.2 Transport using lifting gear .....................................................................15
5.3 Storage ...................................................................................................16
6 Assembly .......................................................................................................17
6.1 Unpacking ...............................................................................................17
6.2 Coating the valve before installation ......................................................17
6.3 Installation conditions..............................................................................18
6.4 Required tools .........................................................................................19
6.5 Required accessories .............................................................................19
6.6 Assembling the valve ..............................................................................20
6.7 Connecting the spool position monitoring ...............................................23
6.8 Connecting the pneumatic control ..........................................................24
6.9 Connecting the hydraulic control.............................................................25
6.10 Changing the pilot oil supply and return..................................................25
6.11 Installing the touch guard ........................................................................25
7 Commissioning .............................................................................................26
7.1 First commissioning; re-commissioning after extended standstill ...........26
8 Operation .......................................................................................................27
8.1 Operating the manual override (only with valve types ...WPH...)............27
8.2 Modifying the stroke ................................................................................28
9 Maintenance ..................................................................................................29
9.1 Term definition ........................................................................................29
9.2 Cleaning and care ...................................................................................30
9.3 Inspection and maintenance ...................................................................30
9.4 Repair .....................................................................................................31
9.5 Spare parts .............................................................................................32
10 Decommissioning .........................................................................................34
10.1 Preparing the components for storage/further use .................................34
11 Disassembly and replacement ....................................................................34
12 Disposal .........................................................................................................35
12.1 Environmental protection ........................................................................35
12.2 Return to Bosch Rexroth AG ..................................................................35
12.3 Packagings .............................................................................................35
12.4 Materials used.........................................................................................35
12.5 Recycling ................................................................................................36

4/40 Bosch Rexroth AG W.H; WM.H | RE 24851-B/06.09
13 Extension and conversion ...........................................................................36
13.1 Optional accessories...............................................................................36
14 Troubleshooting ............................................................................................37
14.1 How to proceed for troubleshooting ........................................................37
15 Technical data ..............................................................................................38
16 Appendix ........................................................................................................39
16.1 Project/installation drawings ...................................................................39
16.2 Address directory ....................................................................................39
Contents

RE 24851-B/06.09 | W.H; WM.H Bosch Rexroth AG 5/40
About this document
1 About this document
These operating instructions are valid for Rexroth 3/2-, 4/2-, and
4/3 directional valves, pilot operated.
These instructions contain important information on the safe and appropriate as-
sembly, transport, commissioning, operation, maintenance, disassembly and
simple troubleshooting of the valve.
Read these instructions completely, especially chapter
"2 General safety instructions" on page 6 before working with the valve.
Target group of these operating instructions
The target group of these operating instructions comprises all groups of per-
sons installing, operating, servicing, and maintaining the products or systems of
Bosch Rexroth.
Product scope
Main product featuresTable 1:
Valve type Size Component
series
Max. operating pressure
A, B, P
Max. operating pres-
sure T
Max. flow
.W.10 10 4X 280 bar 280 bar 160 l/min
.W.16 16 7X 280 bar 250 bar 300 l/min
.W.22 25 7X 280 bar 250 bar 450 l/min
.W.25 25 6X 280 bar 250 bar 700 l/min
.W.32 32 6X 280 bar 250 bar 1100 l/min
H.W.10 10 4X 350 bar 315 bar 160 l/min
H.W.16 16 7X 350 bar 250 bar 300 l/min
H.W.22 25 7X 350 bar 250 bar 450 l/min
H.W.25 25 6X 350 bar 250 bar 700 l/min
H.W.32 32 6X 350 bar 250 bar 1100 l/min

6/40 Bosch Rexroth AG W.H; WM.H | RE 24851-B/06.09
General safety instructions
Related documents1.1
The valve is a system component. Also observe the instructions for the other sys-
tem components. Also observe the instructions in the following manuals:
System documentation from the system manufacturer •
Technical data sheets, see table 2 •
Technical data sheets and operating instructions of the pilot control valves, •
see table 2
Technical data sheets and operating instructions of the additional functionsTable 2:
Valve type Technical data sheet Operating instructions of
additional functions
.WPH, H-.WPH,
.WHH, H-.WHH RE 24851, RE 22282 RE 23001-B
.WPH...QM, H-.WPH...QM,
.WHH...QM, H-.WHH...QM
RE 24851, RE 22282,
RE 24830 RE 23001-B
.WM.H, H-.WM.H RE 24851, RE 22280 RE 23001-B
.WM.H...QM,
H-.WM.H...QM
RE 24851, RE 22280,
RE 24830 RE 23001-B
You will find technical data sheets and operating instructions on the Internet at
http://www.boschrexroth.com/Rexroth-IHD/.
Also observe the generally applicable, legal or otherwise binding regulations of
the European or national legislation and the rules for the prevention of accidents
and for environmental protection applicable in your country.
General safety instructions2
The valve has been manufactured according to the accepted rules of current
technology. There is, however, still a risk of personal injury or damage to property
if the following safety instructions and warnings before instructions contained in
these operating instructions are not observed.
Read these instructions completely and thoroughly before working with
f
the valve.
Keep these instructions in a location where they are accessible to all users
f
at all times.
Always include the operating instructions when you pass the valve on to
f
third parties.
About this document | General safety instructions

RE 24851-B/06.09 | W.H; WM.H Bosch Rexroth AG 7/40
General safety instructions
Intended use2.1
The valve is exclusively intended for being integrated in a machine or system or
for being assembled with other components to form a machine or system. The
product may only be commissioned if it is integrated in the machine/system for
which it is designed.
You should observe the operating conditions and performance limits specified in
the technical data.
The valve is technical equipment and not designed for private use.
Intended use includes having read and understood these instructions, especially
the chapter "2 General safety instructions" on page 6.
Valves with spool position monitoring ...Q...
The valves with spool position monitoring in safety-relevant controls may only as-
sembled and commissioned by hydraulically and electrically trained experts.
Servicing works may only be carried out by authorized experts or by
Bosch Rexroth.
After disassembly of the spool position monitoring, the complete valve may only
be assembled and re-adjusted by authorized experts or by Bosch Rexroth.
Improper use2.2
Any use of the valve other than described in section "2.1 Intended use" is consid-
ered as improper.
Conversions exceeding the extent described in these operating instructions are
not permitted.
The valve is not suitable for being operated in explosive environments.
Qualification of personnel2.3
Assembly, commissioning and operation, disassembly, maintenance (including
servicing and care) require basic mechanical, electrical, hydraulic and pneumatic
knowledge as well as knowledge of the appropriate technical terms. In order to en-
sure operational safety, these activities may only be carried out by corresponding
experts or an instructed person under the direction and supervision of an expert.
Experts are those who can recognize potential hazards and apply the appropriate
safety measures due to their professional training, knowledge and experience, as
well as their understanding of the relevant conditions pertaining to the work to be
undertaken. An expert must observe the relevant specific professional rules.

8/40 Bosch Rexroth AG W.H; WM.H | RE 24851-B/06.09
General safety instructions
Safety instructions in this document2.4
In these instructions, there are warnings before an instruction whenever there is
a risk of personal injury or damage to property. The measures described for pre-
venting these hazards must be observed.
Safety instructionss are set out as follows:
Type of risk!
Consequences
Precautions
f
Warning sign (warning triangle): Draws attention to the hazard •
Signal word: Identifies the degree of hazard •
Type of risk: Specifies the type or source of the hazard •
Consequences: Describes the consequences of non-compliance •
Precautions: Specifies how the hazard can be prevented •
The signal words have the following meaning:
Signal words/warning signsTable 3:
Signal word Application
DANGER! Indicates an imminently hazardous situation which, if not avoided, will
certainly result in death or serious injury.
WARNING! Indicates a potentially hazardous situation which, if not avoided, could
result in death or serious injury.
CAUTION! Indicates a potentially hazardous situation which, if not avoided, could
result in minor or moderate injury or damage to equipment.
If this information is disregarded, the operating procedure may
be impaired.
Adhere to the following instructions2.5
General notes
Observe the regulations on accident prevention and environmental protection •
for the country where the product is used and at the workplace.
Exclusively use Rexroth valves in good technical order and condition. •
Check the valve for visible defects, for example cracks in the housing or miss- •
ing lead seals, screws, cover caps or seals.
Do not modify or retrofit the valve. •
Only use the valve within the performance range provided in the technical data. •
Persons who assemble, operate, disassemble or maintain Rexroth valves must •
not consume any alcohol, drugs or pharmaceuticals that may affect their ability
to react.
Make sure that all safety devices belonging to the valve are present, have been •
installed properly and are fully functional. Do not displace, bypass or disable the
safety devices.
SIGNAL WORD

RE 24851-B/06.09 | W.H; WM.H Bosch Rexroth AG 9/40
General safety instructions
The valve is no safety device. • The valve alone must not be assigned the hold-
ing of a position; there must be another monitoring feature.
The valve could block in an undefined position due to internal pollution – •
e.g. through polluted hydraulic fluid, wear debris or residual dirt from sys-
tem components. As a result, the driven actuator may no longer be under the
operator’s control.
Provide for an appropriate emergency stop function to make sure that the driv- •
en actuator can be set to a safe position (e.g. immediate stop).
Please comply with the specified cleanliness class • 20/18/15 in accordance with
ISO 4406 (c).
If it is necessary to disable safety devices, for example for commissioning or •
maintenance works, always take the appropriate measures to ensure that no
hazard to a person's life or health or to property may occur. Also observe the
superordinate operating instructions for the machine or system.
Works or modifications at the spool position monitoring may only be carried out •
by Bosch Rexroth.
Risk of burning!
During operation, the valve may even get so hot that you may burn yourself.
Allow the valve to cool down sufficiently before touching it.
f
Wear heat-resistant protective clothing, e.g. gloves. f
Provide for a suitable touch guard. f
Please also observe ISO 13732-1 and EN 982. f
Risk of burning!
During operation without hydraulic fluid and with simultaneous switching, the
valve surface reaches temperatures high enough for you to burn yourself. The
max. hydraulic fluid temperature is 80 °C.
Prevent the unwanted leaking of hydraulic fluid from the valve.
f
The warranty only applies to the delivered configuration. •
The warranty will not apply if the product is incorrectly assembled. •
Do not expose the valve to any mechanical loads under any circumstances. •
Never use the valve as a handle or step. Do not place any objects on top of it.
During assembly
Make sure the relevant system component is not under pressure or voltage be- •
fore assembling the valve or when connecting and disconnecting connectors.
Protect the system component against being switched on.
Lay cables and lines so that they cannot be damaged. •
Before commissioning, make sure that all seals and plugs of the plug-in con- •
nection are installed correctly to ensure that they are leakproof and fluids and
foreign bodies are prevented from penetrating the valve.
When assembling, provide for absolute cleanness in order to prevent welding •
beads or metal cuttings from getting into the hydraulic lines and causing valve
wear or malfunctions.
CAUTION!
CAUTION!

10/40 Bosch Rexroth AG W.H; WM.H | RE 24851-B/06.09
General safety instructions
During commissioning
Let the valve acclimate itself for several hours before commissioning, otherwise •
water may condense in the housing.
Make sure that all electrical, hydraulic and pneumatic connections are either •
used or covered. Commission the valve only if it is installed completely.
During cleaning
Cover all openings with the appropriate protective devices in order to prevent •
cleaning agents from penetrating the system.
Never use solvents or aggressive detergents. Only clean the valve using a •
slightly damp, lint-free cloth. Only use water and a mild cleaning agent, if neces-
sary, to do so.
Do not use pressure washers for cleaning. •
During maintenance
Perform the prescribed maintenance works at the intervals specified in the op- •
erating instructions.
Make sure that no lines, connections or components are disconnected as long •
as the system is under pressure and voltage. Protect the system against being
switched on.
During disposal
Dispose of the valve in accordance with the currently applicable national regula- •
tions in your country.
Dispose of the hydraulic fluid in accordance with the currently applicable na- •
tional regulations in your country.
Dispose of hydraulic fluid residues according to the applicable safety data •
sheets for hydraulic fluids.
Obligations of the operator2.6
The operator of the valve from Bosch Rexroth is bound to provide for personnel
training on a regular basis regarding the following subjects:
Observation and use of the operating instructions as well as the •
legal stipulations
Intended use and operation of the Bosch Rexroth valve •
Observation of the instructions from the factory security offices and of the work •
instructions from the operator
What to do in an emergency •
Bosch Rexroth offers training support in specific fields. You can find an
overview of the training contents in the Internet under
http://www.boschrexroth.com/didactic.

RE 24851-B/06.09 | W.H; WM.H Bosch Rexroth AG 11/40
Scope of delivery
Safety labels2.7
Warning signTable 4:
Warning sign Meaning
Hot surface warning
Due to the valve's surface temperature, the warning sign "Hot surface
warning" must be applied to the end product by the machine/system
manufacturer.
Safety equipment2.8
Personal protective equipment
The operator must provide personal protective equipment (e.g. gloves, safety
shoes, safety goggles, overall, etc.).
Touch guard
As protection against the hot valve surfaces, Bosch Rexroth recommends the in-
stallation of a touch guard so that unwanted contact with the hot surface can be
avoided.
Scope of delivery3
The scope of delivery includes:
Valve in accordance with "Technical data sheet" and "Order specification" •
Check the scope of delivery for completeness, particularly the seal rings at the
valve connection surfaces.
Check the scope of delivery for possible transport damage, also see chap-
ter "5 Transport and storage" on page 14.
Check whether the operating instructions are suitable for the valve.
General safety instructions | Scope of delivery

12/40 Bosch Rexroth AG W.H; WM.H | RE 24851-B/06.09
Product description
Product description4
Performance description4.1
See "Technical data sheet"
The assignment of the valves to the technical data sheets is contained in
table 2 on page 6.
Device description4.2
See "Technical data sheet"
The assignment of the valves to the technical data sheets is contained in
table 2 on page 6.
Product identification4.3
Information on the name plate
The meaning of the details on the name plate can be found on the basis of the
enumerated fields from the following figure and the table.
The position of the name plate at the valve is shown in the technical data sheet.
For the meaning of the information of the other name plates (e.g. pilot control
valve, switching time setting, pressure reducing valve, etc.) please refer to the
corresponding operating instructions.
Name plate size 10Fig. 1:
10
1
9
8
7
11
13
3
4
2
16
18
15
17
12
14
19
5
6

RE 24851-B/06.09 | W.H; WM.H Bosch Rexroth AG 13/40
Product description
Name plate size 16, 25, 32Fig. 2:
About the name plateTable 5:
No. Type of information Information or example
1Manufacturer's logo Rexroth
2Material no. of the valve (= order no.) e.g.: R9012345678
3Type designation complete valve e.g.: .WM.H...1)
4--- ---
5Manufacturer's factory number e.g.: 7081
6Date of manufacture (year and week) e.g.: FD: 08W01
7Maximum operating pressure e.g.: Pmax = 350 bar
8Ambient temperature range e.g.: – 30 °C ≤ Ta ≤ + 50 °C
9Hydraulic symbol according to ISO 1219 Graphic
10 Designation of origin Made in Germany
11 Name and address of the manufacturer BOSCH REXROTH AG
D-97816 LOHR
12 Customer or fabrication order number e.g.: 123456789012345678
13 Customer material number or
additional information
e.g.: CNR: 1234567890
14 --- ---
15 --- ---
16 --- ---
17 --- ---
18 --- ---
19 --- ---
1) For the meaning of the individual details of the type designation please refer to the "Technical data
sheet" of the corresponding valve.
For information on the name plate of the pilot control valve please refer to the
operating instructions of the pilot control valve.
1
9
10
2
18
11
13
3
16
7
17
15
8
12
14
19
5
64

14/40 Bosch Rexroth AG W.H; WM.H | RE 24851-B/06.09
Transport and storage
Transport and storage5
Risk of personal injury and damage to property!
In case of improper transport, the valve may fall down and cause damage to the
valve and/or injuries as the components may be sharp-edged, oily, unstable,
loose and bulky.
Provide for a stable position during transport to the place of installation.
f
Use personal protective equipment (like e.g. gloves, working shoes, safety f
goggles, working clothes, etc.).
Comply with the national laws and regulations regarding occupational health
f
and safety and transport.
Risk of health hazards!
When lifting the valves with high weight, there is the risk of health hazards.
In manual transport, use a suitable lifting, putting down and moving technique
f
or use suitable lifting gear.
There are the following possibilities for the transport, depending on the weight:
Transport by hand (valves with low weight; in case of short-term lifting, the latter •
should not exceed 15 kg for women and 25 kg for men).
Transport by means of lifting gear and corresponding accessories (valves with •
high weight and in case of longer transport).
The information on the weight of your valve is contained in the Technical
data sheet.
Transport damage must be reported within one week to Bosch Rexroth to the
following address:
Bosch Rexroth AG
Service Industriehydraulik [Industrial hydraulics]
Bürgermeister-Dr.-Nebel-Straße 8
97816 Lohr am Main
Germany
Phone [phone]
Fax [phone]
For transporting and storing the product always observe the environmental condi-
tions specified in the technical data (see "Technical data sheet").
DANGER!
CAUTION!

RE 24851-B/06.09 | W.H; WM.H Bosch Rexroth AG 15/40
Transport and storage
Transport by hand5.1
Risk of personal injury and damage to property!
In case of improper transport, the valve may fall down and cause damage to the
valve and/or injuries.
Use personal protective equipment (like e.g. gloves, working shoes, safety
f
goggles, working clothes, etc.).
Don't transport the valve using components with little stability, e.g. pilot control
f
valve and spool position monitoring.
In case of transport by hand, the following points are to be observed:
Use a suitable lifting, putting down and moving technique.
f
Use personal protective equipment (like e.g. gloves, working shoes, safety f
goggles, working clothes, etc.).
Don't transport the valve using components with little stability,
fe.g. pilot control
valve and spool position monitoring.
Don't jam the valve.
f
Put the valve carefully onto the contact surface in order not to damage it. f
Transport using lifting gear5.2
Crush injuries and fractures!
Valves that are falling down may cause serious injuries,
e.g. crush injuries, fractures.
Use suitable lifting gear for the transport.
f
Observe the prescribed position of lifting straps. f
Risk of personal injury and damage to property!
In case of improper transport, the valve may fall down and cause damage to the
valve and/or injuries. Parts of the valve may be torn off or deformed.
In order to transport the valve, don't fasten it using components with little sta-
f
bility, e.g. pilot control valve and spool position monitoring.
Make sure that the attachment devices don't contact components with little
f
stability, e.g. pilot control valve and spool position monitoring.
In transport, consider the following aspects:
Properties of the load (e.g. weight, center of gravity, mounting and •
attachment points).
Type of attachment or pick-up of the load. •
Ensure that the lifting gear's lifting capacity is sufficient in order to transport the
valve without risk.
Use textile attachment devices - according to DIN EN 1492-2.
More information regarding the transport is available from Bosch Rexroth.
DANGER!
WARNING!
DANGER!

16/40 Bosch Rexroth AG W.H; WM.H | RE 24851-B/06.09
Transport and storage
Put a transport belt around the valve so that it does not lie over the attachment
f
parts (e.g. pilot control valve and spool position monitoring), see figure 3.
Position of the lifting strapFig. 3:
Storage5.3
Coming from the works, the valve is suitable for being stored up to six months ac-
cording to the following criteria:
Do not store outside, but only under a roof or in a well-ventilated room. •
Protect against soil humidity: Store in shelves or on a wood pallet. •
Cover with foil as protection against dust and dirt. •
All connections at the valve must be covered with plugs. •
At all connection surfaces and blank parts, there must be preservative protec- •
tion. If there is no or insufficient preservative protection, they are to be pre-
served using Bran-O-Rost protective oil.
After opening the transport packaging, it must be closed properly again for •
the storage.
In case of storage of more than six months or in case of sea transport, coordi-
nation with Bosch Rexroth is required.

RE 24851-B/06.09 | W.H; WM.H Bosch Rexroth AG 17/40
Assembly
Assembly6
Unpacking6.1
Dispose of the packaging in accordance with the national regulations of
your country.
Risk of personal injuries and damage to property!
In case of improper opening of the packaging, components of the valve may fall
out and cause damage to the components or even injuries as the components
may be sharp-edged, heavy, oily, unstable, loose and bulky.
Put the packaging on a level ground with sufficient load carrying capacity.
f
Take the device out and provide for a stable position during transport to the f
place of installation.
Use personal protective equipment (like e.g. gloves, working shoes, safety
f
goggles, working clothes, etc.).
Coating the valve before installation 6.2
If the valve is to be painted before the assembly, please observe the following:
Protect the hydraulic ports against paint application by screwing-in plastic
f
threaded plugs completely beforehand.
Protect the mounting bores against paint application.
f
Mask the valve connection surfaces as well as the connection and end plates f
carefully before coating so that no dirt or paint may enter.
Protect the name plate against paint application.
f
Protect existing information signs against paint application. f
Mask the connector of the electrical connections and make sure not to cause f
any damage to the connector.
For the valve types ...QM..., the spool position monitoring must not
be painted.
When removing the coating protection and the plastic threaded plugs make
sure that no paint chips or other foreign bodies enter the valve.
The name plate must be readable after coating.
If you want to coat the valve after the assembly, the same points as when
coating the valve before the assembly have to be observed.

18/40 Bosch Rexroth AG W.H; WM.H | RE 24851-B/06.09
Assembly
Installation conditions6.3
For installing the product always observe the environmental conditions specified
in the technical data (see "Technical data sheet").
Installation position
See "Technical data sheet"
The assignment of the valves to the technical data sheets is contained in ta-
ble 2 on page 6.
Requirements on the valve connection plate
Loss of valve function due to overheating
Falling below the minimum values causes the risk of excess heating of the sole-
noid coil and thus of possible malfunctions.
Observe the specified minimum distance when installing several valves to a
f
valve battery.
Observe the specified minimum size and heat conductivity of the valve con-
f
nection plate.
For recommended subplates, see section "13.1 Optional accessories"
on page 36.
Note on the valve use
Observe the following information during the project planning: f
Damage to the valve, the supply line, and other hydraulic components
Be aware of possible pressure intensification if the valve is connected to the
chamber on the piston rod side of a single-rod cylinder. If the outflow of the hy-
draulic medium from this chamber is obstructed, pressure on the cylinder may re-
sult in a pressure intensification that may damage cylinder chamber, supply line,
and valve.
Make sure that there is adequate mechanical screening against any high-
f
pressure water jet that may be used during cleaning.
If due to the operating conditions to be expected during the switching actions
flows must be anticipated lying outside the valve's performance limits evident from
the characteristic curve, a throttle insert of type B must be used in channel P of
the pilot control valve for flow limitation.
For more information on throttle inserts refer to the related Technical data
sheets and/or operating instructions of the pilot control valve.
In order to safely switch the valve or keep it in its spool position, the performance
limits must be complied with, see Technical data sheet.
The counterpressure at port T must not exceed the value specified in the
Technical data sheet.
WARNING!
WARNING!

RE 24851-B/06.09 | W.H; WM.H Bosch Rexroth AG 19/40
Assembly
Pressure peaks in the joint return line of more than one valve can result in un- •
wanted spool movements and thus cause undesired switching processes. It is
recommended to use separate return lines.
Ports P, A, B and T are clearly fixed according to their function and must not be •
swapped arbitrarily or closed. The flow is only permitted in the direction of the
arrow specified in the Technical data sheet.
Required tools6.4
In order to install the valve, you need standard tools only.
Required accessories6.5
In order to assemble the valve, you need the following accessories, which are not
included in the delivery and can be ordered from Bosch Rexroth.
Valve mounting screws •
Due to reasons of stability, only the following valve mounting screws have to
be used.
Valve mounting screwsTable 6:
Valve type Hexagon socket head cap screws Quantity Tightening torque1) Material no.
..W.10 ISO 4762 - M6 x 45 – 10.9 - flZn-240h-L 4 12.5 Nm ± 10 % 2) R913000258
1/4-20 UNC x 1 3/4" ASTM-A574 4 - 3) Self procurement
..W.16 ISO 4762 - M10 x 60 – 10.9 - flZn-240h-L 4 75 Nm ± 10 % 2) R913000116
ISO 4762 - M6 x 60 – 10.9 - flZn-240h-L 2 12.5 Nm ± 10 % 2) R978800115
3/8-16 UNC x 1 3/4" ASTM-A574 4 - 3) Self procurement
1/4-20 UNC x 2 1/4" ASTM-A574 2 - 3) Self procurement
..W.22
..W.25
ISO 4762 - M12 x 60 – 10.9 - flZn-240h-L 6 130 Nm ± 10 % 2) R913000121
1/2-13 UNC x 2 1/2" ASTM-A574 6 - 3) Self procurement
..W.32 ISO 4762 - M20 x 80 – 10.9 - flZn-240h-L 6 430 Nm ± 10 % 2) R913035246
3/4-10 UNC x 3 1/4" ASTM-A574 6 - 3) Self procurement
1) Please use a torque power screwdriver with a tolerance of ≤ 10 % for tightening purposes.
2) Friction coefficient µtotal 0.09 - 0.14 according to VDA 235-101
3) The operator must ensure for self-procured valve mounting screws that the tightening torque for the
valve mounting screws is complied with and sealing function is guaranteed.
Address for ordering accessories and valves
The addresses of our responsible sales companies can be found on the Internet at
http://www.boschrexroth.de and in section "16.2 Address directory" on page 39.

20/40 Bosch Rexroth AG W.H; WM.H | RE 24851-B/06.09
Assembly
Assembling the valve6.6
Have sufficiently dimensioned collection containers, enough clean-
ing cloths and medium-binding materials ready in order to collect or bind
leaking medium.
Risk of personal injury and damage to property!
Incorrectly assembled valves can cause substantial material damage and per-
sonal injuries. An improperly attached valve may move in an uncontrolled manner
and damage other system components and also cause errors in the hydraulic cir-
cuit or may lose oil and pollute the environment.
Before any work such as assembly or disassembly is carried out at the valve, f
the hydraulic system must be depressurized and the electrical control system
de-energized.
Assembly of the valve requires basic mechanical, hydraulic, pneumatic and
f
electrical knowledge. Only qualified personnel (see section "2.3 Qualification
of personnel" on page 7) are authorized to assemble the valve.
Ensure that the valve is attached securely.
f
Wear, tear and malfunctions!
The cleanliness of the hydraulic fluid has a considerable impact on the
cleanliness and service life of the hydraulic system as a whole. Any pollution/con-
tamination of the hydraulic fluid will result in wear and malfunctions. Particularly
foreign bodies like e.g. welding beads or metal cuttings in the hydraulic lines may
damage the valve.
Always ensure absolute cleanliness. f
Assemble the valve free from any pollution. f
Make sure that all connections, hydraulic lines and attachment parts f
(e.g. measuring devices) are clean.
Ensure that also when sealing the connections, no contaminations are able
f
to penetrate.
Ensure that no cleaning agents are able to penetrate the hydraulic system.
f
Do not use cotton waste or linting cloths for cleaning. f
Do not under any circumstances use hemp as a sealant. f
Installing the valve in the system
Risk due to the use of an improper valve
Installing an improper valve may result in uncontrolled activities and in personal
injuries or damage to other system components.
Check based on the type designation on the name plate of the valve whether
f
there is the correct valve type.
Check the scope of delivery for completeness, particularly the seal rings at the
f
valve connection surfaces.
Check the scope of delivery for possible transport damage.
f
Check whether the operating instructions are suitable for the valve. f
Please observe all safety instructions. f
DANGER!
CAUTION!
CAUTION!