Bosch Rexroth H-4WEH...XE Series User manual

Operating instructions
RE 24751-XE-B/04.16
Replaces: 09.13
English
4/2 and 4/3 directional valves,
internally pilot-operated,
externally pilot-operated
(Area of application according to the explosion protection directive 2014/34/EU: II 2G)
Type H-4WEH...XE...

The data specified serves to describe the
product. If there is also information on the
use, itis only to be regarded as application
examples and proposals. Catalog information
does not constitute warranted properties.
Theinformation given does not release the
user from the obligation of own judgment and
verification. Our products are subject to a
natural process of wear and aging.
© 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 cover shows an example configuration.
Theproduct supplied may therefore differ from
the figure shown.
The original operating instructions were
prepared in German.

RE 24751-XE-B/04.16, H-4WEH...XE..., Bosch Rexroth AG
3/52Contents
Contents
1 About this documentation 5
1.1 Validity of the documentation 5
1.2 Required and amending documentation 5
1.3 Representation of information 5
2 Safety instructions 7
2.1 General information on this chapter 7
2.2 Intended use 7
2.3 Improper use 8
2.4 Qualification of personnel 9
2.5 General safety instructions 10
2.6 Product-specific safety instructions 11
2.7 Notices on the valve use 13
2.8 Personal protective equipment 14
2.9 Obligations of the machine end-user 14
3 General information on damage to property and damage to product 15
4 Scope of delivery 16
5 Product information 16
5.1 Product identification 17
6 Transport and storage 22
6.1 Transporting the valve 22
6.2 Storing the hydraulic valve 23
7 Assembly 24
7.1 Unpacking 24
7.2 Changes to the surface protection of the valve 24
7.3 Installation conditions 24
7.4 Before the assembly 25
7.5 Required tools 25
7.6 Required accessories 25
7.7 Assembling the valve 26
8 Commissioning 34
9 Operation 37
9.1 General information 37
9.2 Operating the manual override (only relevant for type H-4WEH./.NXE.) 38
10 Maintenance and repair 39
10.1 Cleaning and care 39
10.2 Inspection and maintenance 39
10.3 Maintenance schedule 41
10.4 Repair 41
10.5 Rectifying external leakages 41
10.6 Spare parts 42
11 Disassembly and removal 43
12 Disposal 44
12.1 Environmental protection 44
12.2 Return to Bosch Rexroth AG 44
12.3 Packaging 44
12.4 Materials used 45

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12.5 Recycling 45
13 Extension and modification 45
14 Troubleshooting 46
14.1 How to proceed for troubleshooting 46
15 Technical data 47
16 Appendix 48
16.1 List of addresses 48
17 Declaration of conformity 49
18 Alphabetical index 50

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1 About this documentation
1.1 Validity of the documentation
This documentation applies to the following products:
•H-4WEH...XE...
This documentation is intended for assemblers, operators, service engineers, system
end-users, machine and system manufacturers.
This documentation contains important information on the safe and proper
assembly, transport, commissioning, operation, use, maintenance, disassembly and
simple troubleshooting of the product.
▶ Read this documentation thoroughly and in particular chapter2 "Safety
instructions" and chapter 3 "General information on damage to property and
damage to product" before working with the valve.
1.2 Required and amending documentation
▶ The product may not be commissioned until you have been provided with the
documentation marked with the book symbol and you have understood and
observed it.
Table 1: Required and amending documentation
Title Document number Document type
4/2 and 4/3 directional valves, internally
pilot-operated, externally pilot-operated
24751-XE Data sheet
General product information on
hydraulic products
07008 Data sheet
Subplates 45100 Data sheet
Declaration of conformity H-4WEH...XE... Document
Refer to operating
instructions
24751-XE-B
1.3 Representation of information
Uniform safety instructions, symbols, terms and abbreviations are used to ensure
quick and safe working with the product using this documentation. For a better
understanding, they are explained in the following sections.
1.3.1 Safety instructions
In this documentation, safety instructions are included in chapter2.6 "Product-
specific safety instructions" and in chapter3 "General information on damage
to property anddamage to product" and whenever a sequence of actions or
instructions is explained which bear the danger of personal injury or damage to
property. Thehazard avoidance measures described must be observed.

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Safety instructions are structured as follows:
SIGNAL WORD
Type and source of danger!
Consequences in case of non-compliance
▶ Hazard avoidance measures
▶ <Enumeration>
•Warning sign: draws attention to the danger
•Signal word: identifies the degree of danger
•Type and source of danger: specifies the type and source of danger
•Consequences: describes the consequences in case of non-compliance
•Precaution: specifies how the danger can be prevented
Table 2: Risk classes according to ANSI Z535.6-2006
Warning sign, signal word Meaning
DANGER Indicates a dangerous situation which will cause death or
severe injury if not avoided.
WARNING Indicates a dangerous situation which may cause death or
severe injury if not avoided.
CAUTION Indicates a dangerous situation which may cause minor or
moderate (personal) injury if not avoided.
NOTICE Damage to property: The product or the environment could
be damaged.
1.3.2 Symbols
The following symbols indicate notices which are not safety-relevant but increase the
comprehensibility of the documentation.
Table 3: Meaning of the symbols
Symbol Meaning
If this information is not observed, the product cannot be used and/or
operated optimally.
▶ Individual, independent action
1.
2.
3.
Numbered instruction:
The numbers indicate that the actions must be carried out one after
theother.
1.3.3 Abbreviations
The following abbreviations are used in this documentation:
Table 4: Abbreviations
Abbreviation Meaning
ATEX EU Explosion Protection Directive (Atmosphère explosible)
EN European Standard
ISO International Organization for Standardization

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Abbreviation Meaning
IEC International Electrotechnical Commission
RE Rexroth document
IP Ingress protection rating
A, B Hydraulic connections (actuator)
T Hydraulic connection (tank)
P Hydraulic connection (pump)
X, Y Hydraulic connection (pilot oil)
ANSI American National Standards Institute
2 Safety instructions
2.1 General information on this chapter
The product has been manufactured according to the generally accepted codes of
practice. However, there is still the danger of personal injury and damage to property
if you do not observe this chapter and the safety instructions in this documentation.
▶ Read this documentation completely and thoroughly before working with
theproduct.
▶ Keep this documentation in a location where it is accessible to all users at
alltimes.
▶ Always include the required documentation when you pass the product on to
third parties.
2.2 Intended use
The product is a hydraulic component.
You may use the product as follows:
•as a pilot-operated valve with solenoid actuation for intended use in explosive
atmospheres.
The product is only intended for professional use and not for private use.
Intended use includes having read and understood this documentation completely,
especially chapter 2 "Safety instructions".
The valve is designed and constructed for the control of oil flows. It complies with
the requirements of the EU explosion protection directive 2014/34/EU. According
to directive 2014/34/EU, the device group, category and temperature class to which
the valve corresponds are indicated in the "Area of application" section of the
datasheet.

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For information on the device group, category and temperature class according to
the explosion protection directive 2014/34/EU, please refer to "Data sheet 24751-XE"
under "Information on explosion protection" and to the name plate of the valve.
The valve may only be operated in a technically perfect condition and used as
described in these operating instructions. The connection conditions, application
conditions and performance data defined in these operating instructions must not
be changed.
If you intend to use the valve with other connection, application or performance
data than those defined by Bosch Rexroth AG in these operating instructions, please
contact Bosch Rexroth AG beforehand. The valve must not be used with other
connection, application and performance data than those defined in these operating
instructions without the written approval by Bosch Rexroth AG.
2.3 Improper use
Any use deviating from the intended use is improper and thus not admissible.
The installation or use of inappropriate products in safety-relevant applications
could result in unintended operating states during use which in turn could cause
personal injuries and/or damage to property. Therefore, please only use a product
for safety-relevant applications if this use is expressly specified and permitted in
the documentation of the product. For example, in explosion-protected areas or in
safety-related control components (functional safety).
Improper use of the product includes:
•Faulty assembly
•Incorrect transport
•Lack of cleanliness during storage and assembly
•Faulty installation
•Use of inappropriate/non-admissible hydraulic fluids
•Non-compliance with the specified performance limits
Changes and/or modification at the valve are not admissible, see chapter 13
"Extension and modification".
Bosch Rexroth AG does not assume any liability for damage caused by improper use.
The user assumes all risks involved with improper use.

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2.4 Qualification of personnel
The activities described in this documentation require basic knowledge of
mechanics, electrics, hydraulics, pneumatics as well as knowledge of the appropriate
technical terms. For transporting and handling the product, additional knowledge
of how to handle lifting gear and the necessary attachment devices is required.
Inorder to ensure safe use, these activities may only be carried out by an expert in
therespective field or an instructed person under the direction and supervision of
an expert.
Experts are those who are able to recognize potential dangers 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 and have the necessary expert knowledge.
Expert knowledge means for example for hydraulic products:
•reading and completely understanding hydraulic schemes,
•in particular, completely understanding the correlations regarding the safety
equipment and
•having knowledge of the function and set-up of hydraulic components.
The personnel must have the following additional qualifications to the extent
required to fulfill their tasks:
•Understanding of the general principles of explosion protection, protection classes
and device labelling
•Understanding of those aspects of device design which influence the protection
concept
•Understanding of the contents of certificates and of the relevant parts of this
standard
•General understanding of the testing, maintenance and repair requirements of
IEC60079-17
•Familiarity with the special methods which are to be applied during the selection
and installation of devices to which this standard refers
•Understanding of the additional importance of work permit systems and safe
electrical separation regarding explosion protection
Bosch Rexroth offers measures supporting training in specific fields. You can find
an overview of the training contents on the Internet at:
http://www.boschrexroth.de/didactic
Qualification of personnel
for the installation and
commissioning of valves in
explosive areas

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2.5 General safety instructions
•Observe the valid regulations on accident prevention and environmental protection.
•Observe the safety regulations and provisions of the country in which the product
is used/applied.
•Exclusively use Rexroth products in technically perfect condition.
•Observe all notices on the product.
•Persons assembling, operating, disassembling or maintaining Rexroth products
must not be under the influence of alcohol, other drugs or medication influencing
the ability to react.
•Only use original Rexroth accessories and spare parts in order to exclude any
hazard to persons due to unsuitable spare parts.
•Comply with the technical data and environmental conditions specified in the
product documentation.
•The installation or use of inappropriate products in safety-relevant applications
could result in unintended operating states during use which in turn could cause
personal injuries and/or damage to property. Therefore, only use a product for
safety-relevant applications if this use is expressly specified and permitted in the
documentation of the product, e.g. in explosion protection zones or in safety-
related parts of control systems (functional safety).
•Do not commission the product until you can be sure that the end product (for
example a machine or system) where the Rexroth product is installed complies
with the country-specific provisions, safety regulations and standards of the
application.