Machines for underground mines - Safety requirements for hydraulic powered roof supports - Part 3: Hydraulic and electro hydraulic control systems

This document specifies the safety requirements for hydraulic and electro hydraulic control devices, including hydraulic valves and their control elements, valve combinations, control systems, pipes and hose assemblies, fittings, shut-off devices, measuring devices, filters, built-in pressure limiting and check valves in legs and rams and water spraying and dust suppression valves, as well emergency stop, start warning, locking- and control unit when used as specified by the manufacturer or his authorized representative. Excluded are pressure generators, and internal valves of legs and rams (e.g. leg bottom valves, see EN 1804-2).
NOTE   Some components are dealt with in other parts of this standard.
This document applies to hydraulic and electro hydraulic control devices at ambient temperatures from -10 °C to 60 °C.
This document identifies and takes into account:
-   possible hazards which may be caused by the operation of hydraulic and electro hydraulic control devices;
-   areas and operating conditions which may create such hazards;
-   hazardous situations which may cause injury or may be damaging to health;
-   hazards which may be caused by firedamp and/or combustible dusts.
This document describes methods for the reduction of these hazards.
A list of significant hazards covered appears in Clause 4.
This document does not specify any additional requirements for:
-   use in particularly corrosive environments;
-   hazards occurring during construction, transportation, decommissioning;
-   earthquakes.
This document is applicable to all hydraulic and electro hydraulic control unit placed on the market for the first time and which are manufactured after the date on which this standard was published.

Maschinen für den Bergbau unter Tage - Sicherheitsanforderungen für hydraulischen Schreitausbau - Teil 1: Ausbaugestelle und allgemeine Anforderungen

Diese Europäische Norm legt die Sicherheitsanforderungen für die vom Hersteller oder seinem bevollmächtigten Vertreter vorgesehene bestimmungsgemäße Verwendung von Ausbaugestellen fest. Beispiele für Ausbaugestelle sind: Ausbaurahmen, Ausbauböcke, Ausbauschilde, Ausbaugespanne und Ausbauzüge einschließlich der Rückeinrichtungen und der Teile von Abspannungen, welche Ausbaufunktionen haben. Dieser Teil der Norm schließt Anschlagelemente am Förderer, Gewinnungseinrichtungen, Stempel und Zylinder, Ventile, hydraulische und elektrohydraulische Steuerungseinrichtungen, Beleuchtungs  und Signaleinrichtungen sowie sonstige Hilfseinrichtungen aus.  
ANMERKUNG   Einige Komponenten werden in anderen Teilen dieser Normenreihe behandelt.
Diese Norm gilt für Ausbaugestelle, die bei Umgebungstemperaturen zwischen -10°C und 60°C eingesetzt werden.
Diese Norm gilt darüber hinaus für Ausbauteile und Ausbauzubehör, die/das vorgesehen sind/ist, wenn das Ausbaugestell mit Versatzeinrichtungen ausgerüstet wird. Diese Norm identifiziert und berücksichtigt:
-   die Gefährdungen, die womöglich durch den Betrieb von Ausbaugestellen hervorgerufen werden können;
-   die Gefahrenbereiche und die Betriebsbedingungen, die irgendeine Art von Gefährdung verursachen können, und
-   die Situationen, die zu Gefährdungen führen können, die eine Verletzung oder Gesundheitsschädigung verursachen;
-   Gefahren, die durch Grubengas und/oder brennbare Stäube verursacht werden können.
Diese Norm beschreibt Verfahren zur Reduzierung dieser Gefährdungen.
Abschnitt 4 enthält eine Liste der behandelten Gefährdungen.
Diese Europäische Norm spezifiziert keine zusätzlichen Anforderungen für:
-   besonders korrosive Umgebung;
-   Risiken bei Herstellung, Transport und Außerbetriebnahme;
-   Erdbeben.
Diese Norm gilt für alle Ausbaugestelle, die nach dem Ausgabedatum dieser Norm erstmalig in Verkehr gebracht wurden.

Machines pour mines souterraines - Exigences de sécurité relatives aux soutènements marchants applicables aux piles - Partie 3 : Systèmes de commande hydrauliques et électro-hydrauliques

Le présent document spécifie les exigences de sécurité relatives aux systèmes de commande hydrauliques et électro-hydrauliques lorsqu’ils sont utilisés tel que spécifié par le fabricant ou son mandataire. Les systèmes de commande hydrauliques et électro-hydrauliques comprennent les soupapes hydrauliques et leurs organes de commande, les combinaisons de soupapes, les systèmes de commande, les tuyaux et flexibles, les raccords, les dispositifs d’arrêt et de mesure, les filtres, les soupapes de limitation de pression et les clapets de non-retour intégrés aux étançons et vérins, les soupapes de pulvérisation d’eau pour l’élimination des poussières ainsi que le dispositif d’arrêt d’urgence et l’unité d’avertissement, de verrouillage et de commande de démarrage. Sont exclus les générateurs de pression ainsi que les soupapes internes des étançons et vérins (par exemple soupapes inférieures des étançons, voir l’EN 1804-2).
NOTE   Certains composants sont traités dans d’autres parties de la présente norme.
Le présent document s’applique aux systèmes de commande hydrauliques et électro-hydrauliques à des températures ambiantes comprises entre -10 °C et 60 °C.
Le présent document identifie et tient compte :
-   des phénomènes dangereux potentiels pouvant résulter de l’utilisation des systèmes de commande hydrauliques et électro-hydrauliques ;
-   des zones dangereuses et des conditions d’utilisation susceptibles de créer de tels phénomènes dangereux ;
-   des situations dangereuses susceptibles d’entraîner des blessures ou de porter atteinte à la santé ;
-   des phénomènes dangereux dus au grisou et/ou à des poussières combustibles.
Le présent document décrit des méthodes de réduction de ces phénomènes dangereux.
Une liste des phénomènes dangereux significatifs couverts est donnée à l’Article 4.
Le présent document ne définit pas d’exigences supplémentaires concernant :
-   une utilisation dans des milieux particulièrement corrosifs ;
-   les phénomènes dangereux dus à la construction, au transport et à la mise hors service ;
-   les tremblements de terre.
Le présent document s’applique à toutes les unités de commande hydrauliques et électro-hydrauliques commercialisées pour la première fois et fabriquées après la date de publication de la présente norme.

Stroji za podzemne rudnike - Varnostne zahteve za hidravlično podporje - 3. del: Hidravlični in elektrohidravlični krmilni sistemi

General Information

Status
Published
Public Enquiry End Date
24-Apr-2019
Publication Date
03-Mar-2021
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
05-Jan-2021
Due Date
12-Mar-2021
Completion Date
04-Mar-2021

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SLOVENSKI STANDARD
SIST EN 1804-3:2021
01-april-2021
Nadomešča:
SIST EN 1804-3:2006+A1:2010
Stroji za podzemne rudnike - Varnostne zahteve za hidravlično podporje - 3. del:
Hidravlični in elektrohidravlični krmilni sistemi
Machines for underground mines - Safety requirements for hydraulic powered roof
supports - Part 3: Hydraulic and electro hydraulic control systems

Maschinen für den Bergbau unter Tage - Sicherheitsanforderungen für hydraulischen

Schreitausbau - Teil 1: Ausbaugestelle und allgemeine Anforderungen

Machines pour mines souterraines - Exigences de sécurité relatives aux soutènements

marchants applicables aux piles - Partie 3 : Systèmes de commande hydrauliques et

électro-hydrauliques
Ta slovenski standard je istoveten z: EN 1804-3:2020
ICS:
73.100.10 Oprema za gradnjo predorov Tunnelling and tubbing
in podzemnih železnic equipment
SIST EN 1804-3:2021 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 1804-3:2021
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SIST EN 1804-3:2021
EN 1804-3
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2020
EUROPÄISCHE NORM
ICS 73.100.10 Supersedes EN 1804-3:2006+A1:2010
English Version
Machines for underground mines - Safety requirements for
hydraulic powered roof supports - Part 3: Hydraulic and
electro hydraulic control systems

Machines pour mines souterraines - Exigences de Maschinen für den Bergbau unter Tage -

sécurité relatives aux soutènements marchants Sicherheitsanforderungen an hydraulischen

applicables aux piles - Partie 3 : Systèmes de Schreitausbau - Teil 3: Hydraulische und elektro-

commande hydrauliques et électro-hydrauliques hydraulische Steuerungen
This European Standard was approved by CEN on 25 October 2020.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this

European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references

concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN

member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by

translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 1804-3:2020 E

worldwide for CEN national Members.
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SIST EN 1804-3:2021
EN 1804-3:2020 (E)
Contents Page

European foreword ............................................................................................................................................ 5

Introduction .......................................................................................................................................................... 6

1 Scope .......................................................................................................................................................... 7

2 Normative references .......................................................................................................................... 7

3 Terms and definitions ......................................................................................................................... 9

4 Safety requirements .......................................................................................................................... 15

4.1 General requirements ....................................................................................................................... 15

4.1.1 General.................................................................................................................................................... 15

4.1.2 Hazard areas ......................................................................................................................................... 15

4.1.3 Arrangement of the control devices ............................................................................................. 15

4.1.4 Hold-to-run control ............................................................................................................................ 15

4.1.5 Shut-off devices.................................................................................................................................... 15

4.1.6 Pressure indicator .............................................................................................................................. 15

4.1.7 Arrangement of in-shield and inter-shield hose routing ..................................................... 15

4.1.8 Pipe and hose assemblies ................................................................................................................ 16

4.1.9 Hydraulic fluids ................................................................................................................................... 16

4.1.10 Lifting points ......................................................................................................................................... 17

4.2 Design requirements ......................................................................................................................... 17

4.2.1 Protection against ejected fluids ................................................................................................... 17

4.2.2 Roof contact advance ......................................................................................................................... 17

4.2.3 Pressure limiting ................................................................................................................................. 17

4.2.4 Interruption of the operating pressure ...................................................................................... 17

4.2.5 Travel speed ......................................................................................................................................... 17

4.2.6 Actuating forces ................................................................................................................................... 17

4.2.7 Resistance to back pressure ........................................................................................................... 17

4.2.8 Adjustable valves ................................................................................................................................ 17

4.3 Requirements of type A valves ....................................................................................................... 18

4.3.1 General.................................................................................................................................................... 18

4.3.2 Leaktightness ....................................................................................................................................... 18

4.3.3 Yield pressure ...................................................................................................................................... 18

4.3.4 Working pressure ............................................................................................................................... 18

4.3.5 Closing pressure .................................................................................................................................. 18

4.3.6 Pressure pulses.................................................................................................................................... 18

4.3.7 Impact resistance ................................................................................................................................ 18

4.3.8 Pressure flow behaviour .................................................................................................................. 18

4.3.9 Operating reliability .......................................................................................................................... 18

4.3.10 Temperature effects .......................................................................................................................... 18

4.3.11 Resistance to back pressure ........................................................................................................... 18

4.4 Requirements for type B and C valves ......................................................................................... 19

4.4.1 General.................................................................................................................................................... 19

4.4.2 Leaktightness ....................................................................................................................................... 19

4.4.3 Resistance to pressure ...................................................................................................................... 19

4.4.4 Switching behaviour .......................................................................................................................... 19

4.4.5 Operating reliability .......................................................................................................................... 19

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SIST EN 1804-3:2021
EN 1804-3:2020 (E)

4.4.6 Resistance to back pressure ........................................................................................................... 19

4.5 Requirements for type D valves .................................................................................................... 19

4.6 Materials ................................................................................................................................................ 19

4.6.1 Metallic materials ............................................................................................................................... 19

4.6.2 Light metal ............................................................................................................................................ 19

4.6.3 Other materials ................................................................................................................................... 19

4.6.4 Seals ......................................................................................................................................................... 20

4.7 General electro hydraulic ................................................................................................................ 20

4.7.1 General requirements ....................................................................................................................... 20

4.7.2 Arrangement of in-shield and inter-shield cable routing .................................................... 20

4.7.3 Electro hydraulic valves ................................................................................................................... 20

4.7.4 Stroke measurement devices ......................................................................................................... 20

4.7.5 Pressure indicator .............................................................................................................................. 20

4.7.6 Pressure transducer .......................................................................................................................... 20

4.7.7 Electro hydraulic control unit ........................................................................................................ 20

5 Verification of the safety requirements ..................................................................................... 23

5.1 Type testing .......................................................................................................................................... 23

5.2 Additional tests ................................................................................................................................... 23

6 User Information ................................................................................................................................ 25

6.1 General requirements ....................................................................................................................... 25

6.2 Technical and application data...................................................................................................... 26

6.2.1 Introduction ......................................................................................................................................... 26

6.2.2 General description ........................................................................................................................... 26

6.2.3 Performance data ............................................................................................................................... 26

6.2.4 Hydraulic data ..................................................................................................................................... 26

6.2.5 List of additional drawings and documents .............................................................................. 26

6.3 Handling, transport and storage ................................................................................................... 26

6.3.1 Introduction ......................................................................................................................................... 26

6.3.2 Handling and transport .................................................................................................................... 26

6.3.3 Storage .................................................................................................................................................... 27

6.4 Installation and commissioning .................................................................................................... 27

6.4.1 Installation ............................................................................................................................................ 27

6.4.2 Commissioning .................................................................................................................................... 27

6.5 Operation ............................................................................................................................................... 27

6.6 Maintenance ......................................................................................................................................... 27

6.6.1 Introduction ......................................................................................................................................... 27

6.6.2 Technical description ........................................................................................................................ 27

6.6.3 Maintenance instructions ................................................................................................................ 27

6.6.4 Fault diagnosis and correction ...................................................................................................... 28

6.6.5 Preventive maintenance schedules ............................................................................................. 28

6.7 Spare parts identification lists ....................................................................................................... 28

6.8 Marking .................................................................................................................................................. 28

6.9 Residual risks ....................................................................................................................................... 28

Annex A (normative) Test for verification of the safety requirements ........................................ 29

A.1 Load tests ............................................................................................................................................... 29

A.1.1 General ................................................................................................................................................... 29

A.1.2 Lifting points ........................................................................................................................................ 29

A.1.3 Testing of type A valves .................................................................................................................... 29

A.1.4 Testing of type B valves .................................................................................................................... 33

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SIST EN 1804-3:2021
EN 1804-3:2020 (E)

A.1.5 Testing of type C valves ..................................................................................................................... 36

A.1.6 Testing of type D valves .................................................................................................................... 37

Annex B (informative) List of significant hazards ................................................................................ 38

Annex ZA (informative) Relationship between this European Standard and the essential

requirements of Directive 2006/42/EC aimed to be covered ............................................ 41

Bibliography ....................................................................................................................................................... 43

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SIST EN 1804-3:2021
EN 1804-3:2020 (E)
European foreword

This document (EN 1804-3:2020) has been prepared by Technical Committee CEN/TC 196 “Mining

machinery and equipment - Safety”, the secretariat of which is held by DIN.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by June 2021, and conflicting national standards shall be

withdrawn at the latest by June 2021.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN 1804-3:2006+A1:2010.

The main differences between this document and EN 1804-3:2006+A1:2010 are as follows:

a) Normative references (updated);
b) Terms and definitions (revised/modified/enhanced);
c) List of significant hazards (revised/enhanced) (see Annex B);
d) Requirements for automatic hydraulic functions (deleted);
e) Requirements for in- and inter-shield hose routing (added);
f) Requirements for pipe and hose assemblies (updated);
g) Requirements for type “A” valves (modified);
h) Requirements for electro hydraulic control systems (added);
i) List of verification tests (updated/enhanced);
j) Figures and pictures (revised/added).

This document has been prepared under a mandate given to CEN by the European Commission and the

European Free Trade Association and supports essential requirements of EU Directive(s).

For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this

document.

According to the CEN-CENELEC Internal Regulations, the national standards organisations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia,

Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,

Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North

Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United

Kingdom.
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SIST EN 1804-3:2021
EN 1804-3:2020 (E)
Introduction
This document is a type C standard as stated in EN ISO 12100.

The machinery concerned and the extent to which hazards, hazardous situations and events are covered

are indicated in the scope of this document.

This document is of relevance, in particular, for the following stakeholder groups representing the market

players with regard to machinery safety:
— machine manufacturers (small, medium and large enterprises);

— health and safety bodies (regulators, accident prevention organizations, market surveillance, etc.).

Others can be affected by the level of machinery safety achieved with the means of the document by the

above-mentioned stakeholder groups:
— machine users/employers (small, medium and large enterprises);

— machine users/employees (e.g. trade unions, organizations for people with special needs);

— service providers, e.g. for maintenance (small, medium and large enterprises);
— consumers (in the case of machinery intended for use by consumers).

The above-mentioned stakeholder groups have been given the possibility to participate at the drafting

process of this document.

The machinery concerned and the extent to which hazards, hazardous situations or hazardous events are

covered are indicated in the Scope of this document.

When requirements of this type-C standard are different from those which are stated in type-A or type-B

standards, the requirements of this type-C standard take precedence over the requirements of the other

standards for machines that have been designed and built according to the requirements of this type-C

standard. The extent to which hazards are covered is indicated in the scope of this document.

While preparing this document, it was assumed that:
— only trained and competent persons operate the machine;
— components without specific requirements are:

— designed in accordance with the usual engineering practice and calculation code;

— of sound mechanical construction;
— free of defects;
— components are kept in good working condition / order;

— a negotiation took place between the user and the manufacturer concerning the use of the machinery.

---------------------- Page: 8 ----------------------
SIST EN 1804-3:2021
EN 1804-3:2020 (E)
1 Scope

This document specifies the safety requirements for hydraulic and electro hydraulic control devices,

including hydraulic valves and their control elements, valve combinations, control systems, pipes and

hose assemblies, measuring devices, built-in pressure limiting and check valves in legs and rams and, as

well emergency stop, start warning, blocking- and control unit when used as specified by the

manufacturer or his authorized representative. Excluded are pressure generators, and internal valves of

legs and rams (e.g. leg bottom valves, see EN 1804-2:2020).
NOTE Some components are dealt with in other parts of this standard.

This document applies to hydraulic and electro hydraulic control devices at ambient temperatures from

–10 °C to 60 °C.
This document identifies and takes into account:

— possible hazards which can be caused by the operation of hydraulic and electro hydraulic control

devices;
— areas and operating conditions which can create such hazards;
— hazardous situations which can cause injury or can be damaging to health;
— hazards which can be caused by firedamp and/or combustible dusts.
This document describes methods for the reduction of these hazards.
A list of significant hazards covered appears in Clause 4.
This document does not specify any additional requirements for:
— use in particularly corrosive environments;
— hazards occurring during construction, transportation, decommissioning;
— earthquakes.

A complete hydraulic powered roof support consists of the support units (EN 1804-1:2020), legs and

support rams (EN 1804-2:2020) and the hydraulic and electro hydraulic controls (EN 1804-3:2020).

Each part of this multipart document addresses the safety requirements of the components mentioned

in the scopes of the respective parts of this multipart series.

This document is not applicable to hydraulic and electro hydraulic control systems manufactured before

the date of its publication.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

EN 853:2015, Rubber hoses and hose assemblies — Wire braid reinforced hydraulic type — Specification

EN 854:2015, Rubber hoses and hose assemblies — Textile reinforced hydraulic type — Specification

EN 856:2015+AC:2019, Rubber hoses and hose assemblies — Rubber-covered spiral wire reinforced

hydraulic type — Specification
---------------------- Page: 9 ----------------------
SIST EN 1804-3:2021
EN 1804-3:2020 (E)

EN 857:2015, Rubber hoses and hose assemblies — Wire braid reinforced compact type for hydraulic

applications — Specification

EN 981:1996+A1:2008, Safety of machinery — System of auditory and visual danger and information

signals

EN 1804-1:2020, Machines for underground mines — Safety requirements for hydraulic powered roof

supports — Part 1: Support units and general requirements

EN 1804-2:2020, Machines for underground mines — Safety requirements for hydraulic powered roof

supports — Part 2: Power set legs and rams

EN ISO 3949:2020, Plastics hoses and hose assemblies — Textile-reinforced types for hydraulic applications

— Specification (ISO 3949:2020)

EN 62061:2005 , Safety of machinery — Functional safety of safety-related electrical, electronic and

programmable electronic control systems (IEC 62061:2005 + A1:2012 + A2:2015)

EN ISO 80079-36:2016 , Explosive atmospheres — Part 36: Non-electrical equipment for explosive

atmospheres — Basic method and requirements (ISO 80079-36:2016)

EN ISO 4413:2010, Hydraulic fluid power — General rules and safety requirements for systems and their

components (ISO 4413:2010)

EN ISO 12100:2010, Safety of machinery — General principles for design – Risk assessment and risk

reduction (ISO 12100:2010)

EN ISO 13849-1:2015, Safety of machinery — Safety-related parts of control systems — Part 1: General

principles for design (ISO 13849-1:2015)

EN ISO 13849-2:2012, Safety of machinery — Safety-related parts of control systems — Part 2: Validation

(ISO 13849-2:2012)

EN ISO 13850:2015, Safety of machinery — Emergency stop function — Principles for design

(ISO 13850:2015)
EN IEC 60079 (all parts), Explosive atmospheres (IEC 60079)

ISO 6805:2020, Rubber hoses and hose assemblies for underground mining — Wire-reinforced hydraulic

types for coal mining — Specification

ISO 7745:2010, Hydraulic fluid power — Fire-resistant (FR) fluids — Requirements and guidelines for use

DIN 22100-5:2010, Articles and materials from synthetic for use in underground mines — Part 5: Tubes,

tube isolations and hoses — Safety requirements, testing, marking

As impacted by EN 62061:2005/A1:2013, EN 62061:2005/A2:2015 and EN 62061:2005/corrigendum Feb. 2012.

As impacted by EN ISO 80079-36:2016/AC:2019.
---------------------- Page: 10 ----------------------
SIST EN 1804-3:2021
EN 1804-3:2020 (E)
3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN ISO 12100:2010,

EN 1804-1:2020, EN 1804-2:2020 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
3.1
hydraulic control devices

system required to control all the functions of the hydraulic powered roof supports

3.2
sensor
measuring element
3.3
pressures
3.3.1
yield pressure of a pressure limiting valve

hydraulic pressure to which a pressure limiting valve is adjusted and at which it should operate (pressure

specified by manufacturer)
3.3.2
cracking pressure of a pressure limiting valve

hydraulic pressure at which a valve begins to open and hydraulic fluid is passing through it

3.3.3
working pressure of a pressure limiting valve
pressure during operation of a pressure limiting valve
3.3.4
closing pressure of a pressure limiting valve

pressure at which the valve is closed and the flow of hydraulic fluid is shut off

3.3.5
maximum permissible working pressure
pressure specified by manufacturer
3.4
valves
3.4.1
type A valves
(pressure limiting valves) limit the internal hydraulic pressure of actuators
3.4.2
type B valves
(e.g. check valves) shut off the hydraulic fluid directly from the actuators
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SIST EN 1804-3:2021
EN 1804-3:2020 (E)
3.4.3
type C valves
(e.g. directional control valves) in their neutral positi
...

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