ISO 19973-4:2014
(Main)Pneumatic fluid power — Assessment of component reliability by testing — Part 4: Pressure regulators
Pneumatic fluid power — Assessment of component reliability by testing — Part 4: Pressure regulators
ISO 19973-4:2014 provides test procedures for assessing the reliability of pneumatic pressure regulators by testing and the methods of reporting the results of testing. General test conditions and the calculation method are provided in ISO 19973-1. The methods specified in ISO 19973-1 apply to the first failure, as obtained with the three-points moving average (3PMA) method, without repairs, but excluding outliers. ISO 19973-4:2014 applies to manually adjustable and remote-piloted pressure regulators, both relieving and non-relieving. It does not apply to pressure regulators that have a permanent bleed. ISO 19973-4:2014 also specifies test equipment and failure criteria (threshold levels) for tests to assess the reliability of pneumatic pressure regulators.
Transmissions pneumatiques — Évaluation par essais de la fiabilité des composants — Partie 4: Régulateurs de pression
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INTERNATIONAL ISO
STANDARD 19973-4
Second edition
2014-03-01
Pneumatic fluid power — Assessment
of component reliability by testing —
Part 4:
Pressure regulators
Transmissions pneumatiques — Évaluation par essais de la fiabilité
des composants —
Partie 4: Régulateurs de pression
Reference number
©
ISO 2014
© ISO 2014
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2014 – All rights reserved
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Symbols and units . 2
5 Test equipment. 2
5.1 Basic test equipment . 2
5.2 Directional control valve . 4
5.3 Volumes . 4
6 Test conditions . 4
6.1 General test conditions . 4
6.2 Inlet and regulated pressures . 5
7 Test procedure . 5
7.1 Timing of checks and measurements . 5
7.2 Type and scope of checks and measurements . 5
7.3 Endurance test . 5
8 Failure criteria and threshold levels . 7
8.1 General . 7
8.2 Functional failure . 7
8.3 Failure due to leakage . 7
8.4 Failure due to pressure characteristics . 7
8.5 Customised agreements . 7
9 Data analysis . 7
10 Test report . 8
11 Identification statement (reference to this part of ISO 19973) . 8
Annex A (informative) Flow chart illustrating the test procedure specified in this part of
ISO 19973 . 9
Annex B (informative) Optional expanded test circuit .10
Annex C (informative) Test data sheet .12
Bibliography .16
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers
to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 131, Fluid power systems.
This second edition cancels and replaces the first edition (ISO 19973-4:2007), which has been technically
revised.
ISO 19973 consists of the following parts, under the general title Pneumatic fluid power — Assessment of
component reliability by testing:
— Part 1: General procedures
— Part 2: Directional control valves
— Part 3: Cylinders with piston rod
— Part 4: Pressure regulators
The following part is under preparation:
— Part 5: Non-return valves, shuttle valves, dual pressure valves (AND function), one-way adjustable flow
control valves, quick-exhaust valves
iv © ISO 2014 – All rights reserved
Introduction
In pneumatic fluid power systems, power is transmitted and controlled through a gas under pressure
within a circuit. Pneumatic fluid power systems are composed of components and are an integral part of
various types of machines and equipment. Efficient and economical production requires highly reliable
machines and equipment. Within the ISO 19973 series, this part is intended to provide requirements and
test conditions that permit the assessment of the inherent reliability of pneumatic pressure regulators.
It is necessary that machine producers know the reliability of the components that make up their
machine’s pneumatic fluid power system. Knowing the reliability characteristic of the component, the
producers can model the system and make decisions on service intervals, spare parts inventory, and
areas for future improvements.
There are three primary levels in the determination of component reliability:
a) preliminary design analysis — finite element analysis (FEA), failure mode and effect analysis
(FMEA);
b) laboratory testing and reliability modelling — physics of failure, reliability prediction, pre-
production evaluation;
c) collection of field data — maintenance reports, warranty analysis.
Each level has its application during the life of a component. A preliminary design analysis is useful to
identify possible failure modes and eliminate them or reduce their effect on reliability. When prototypes
are available, in-house laboratory reliability tests are run and initial reliability can be determined.
Reliability testing is often continued into the initial production run and throughout the production
lifetime as a continuing evaluation of the component. Collection of field data is possible when products
are operating and data on their failures are available.
INTERNATIONAL STANDARD ISO 19973-4:2014(E)
Pneumatic fluid power — Assessment of component
reliability by testing —
Part 4:
Pressure regulators
1 Scope
This part of ISO 19973 provides test procedures for assessing the reliability of pneumatic pressure
regulators by testing and the methods of reporting the results of testing. General test conditions and
the calculation method are provided in ISO 19973-1. The methods specified in ISO 19973-1 apply to the
first failure, as obtained with the three-points moving average (3PMA) method, without repairs, but
excluding outliers.
The lifetime of pneumatic pressure regulators is usually given as a number of cycles. Therefore, whenever
the term “time” is used in this part of ISO 19973, this variable shall be understood as either cycles or
time.
This part of ISO 19973 applies to manually adjustable and remote-piloted pressure regulators, both
relieving and non-relieving. This part of ISO 19973 does not apply to pressure regulators that have a
permanent bleed.
This part of ISO 19973 also specifies test equipment and failure criteria (threshold levels) for tests to
assess the reliability of pneumatic pressure regulators.
The life determined by the method in this part of ISO 19973 and in ISO 19973-1 will be more closely
related to applications that have a large variation in flow rate.
NOTE See Annex A for a flow chart illustrating the test procedure specified in this part of ISO 19973.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 1219-1, Fluid power systems and components — Graphical symbols and circuit diagrams — Part 1:
Graphical symbols for conventional use and data-processing applications
ISO 5598, Fluid power systems and components — Vocabulary
ISO 6953-1, Pneumatic fluid power — Compressed air pressure regulators and filter-regulators — Part 1:
Main characteristics to be included in literature from suppliers and product-marking requirements
ISO 6953-3, Pneumatic fluid power — Compressed air pressure regulators and filter-regulators — Part 3:
Alternative test methods for measuring the flow-rate characteristics of pressure regulators
1)
ISO 19973-1:— , Pneumatic fluid power — Assessment of component reliability by testing — Part 1: General
procedures
ISO 80000-1, Quantities and units — Part 1: General
IEC 60050-191, International Electrotechnical Vocabulary. Chapter 191: Dependability and quality of service
1) To be published. (Revision of ISO 19973-1:2007)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 5598, ISO 6953-1, ISO 19973-1,
and IEC 60050-191 app
...
INTERNATIONAL ISO
STANDARD 19973-4
Second edition
2014-03-01
Pneumatic fluid power — Assessment
of component reliability by testing —
Part 4:
Pressure regulators
Transmissions pneumatiques — Évaluation par essais de la fiabilité
des composants —
Partie 4: Régulateurs de pression
Reference number
©
ISO 2014
© ISO 2014
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2014 – All rights reserved
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Symbols and units . 2
5 Test equipment. 2
5.1 Basic test equipment . 2
5.2 Directional control valve . 4
5.3 Volumes . 4
6 Test conditions . 4
6.1 General test conditions . 4
6.2 Inlet and regulated pressures . 5
7 Test procedure . 5
7.1 Timing of checks and measurements . 5
7.2 Type and scope of checks and measurements . 5
7.3 Endurance test . 5
8 Failure criteria and threshold levels . 7
8.1 General . 7
8.2 Functional failure . 7
8.3 Failure due to leakage . 7
8.4 Failure due to pressure characteristics . 7
8.5 Customised agreements . 7
9 Data analysis . 7
10 Test report . 8
11 Identification statement (reference to this part of ISO 19973) . 8
Annex A (informative) Flow chart illustrating the test procedure specified in this part of
ISO 19973 . 9
Annex B (informative) Optional expanded test circuit .10
Annex C (informative) Test data sheet .12
Bibliography .16
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers
to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 131, Fluid power systems.
This second edition cancels and replaces the first edition (ISO 19973-4:2007), which has been technically
revised.
ISO 19973 consists of the following parts, under the general title Pneumatic fluid power — Assessment of
component reliability by testing:
— Part 1: General procedures
— Part 2: Directional control valves
— Part 3: Cylinders with piston rod
— Part 4: Pressure regulators
The following part is under preparation:
— Part 5: Non-return valves, shuttle valves, dual pressure valves (AND function), one-way adjustable flow
control valves, quick-exhaust valves
iv © ISO 2014 – All rights reserved
Introduction
In pneumatic fluid power systems, power is transmitted and controlled through a gas under pressure
within a circuit. Pneumatic fluid power systems are composed of components and are an integral part of
various types of machines and equipment. Efficient and economical production requires highly reliable
machines and equipment. Within the ISO 19973 series, this part is intended to provide requirements and
test conditions that permit the assessment of the inherent reliability of pneumatic pressure regulators.
It is necessary that machine producers know the reliability of the components that make up their
machine’s pneumatic fluid power system. Knowing the reliability characteristic of the component, the
producers can model the system and make decisions on service intervals, spare parts inventory, and
areas for future improvements.
There are three primary levels in the determination of component reliability:
a) preliminary design analysis — finite element analysis (FEA), failure mode and effect analysis
(FMEA);
b) laboratory testing and reliability modelling — physics of failure, reliability prediction, pre-
production evaluation;
c) collection of field data — maintenance reports, warranty analysis.
Each level has its application during the life of a component. A preliminary design analysis is useful to
identify possible failure modes and eliminate them or reduce their effect on reliability. When prototypes
are available, in-house laboratory reliability tests are run and initial reliability can be determined.
Reliability testing is often continued into the initial production run and throughout the production
lifetime as a continuing evaluation of the component. Collection of field data is possible when products
are operating and data on their failures are available.
INTERNATIONAL STANDARD ISO 19973-4:2014(E)
Pneumatic fluid power — Assessment of component
reliability by testing —
Part 4:
Pressure regulators
1 Scope
This part of ISO 19973 provides test procedures for assessing the reliability of pneumatic pressure
regulators by testing and the methods of reporting the results of testing. General test conditions and
the calculation method are provided in ISO 19973-1. The methods specified in ISO 19973-1 apply to the
first failure, as obtained with the three-points moving average (3PMA) method, without repairs, but
excluding outliers.
The lifetime of pneumatic pressure regulators is usually given as a number of cycles. Therefore, whenever
the term “time” is used in this part of ISO 19973, this variable shall be understood as either cycles or
time.
This part of ISO 19973 applies to manually adjustable and remote-piloted pressure regulators, both
relieving and non-relieving. This part of ISO 19973 does not apply to pressure regulators that have a
permanent bleed.
This part of ISO 19973 also specifies test equipment and failure criteria (threshold levels) for tests to
assess the reliability of pneumatic pressure regulators.
The life determined by the method in this part of ISO 19973 and in ISO 19973-1 will be more closely
related to applications that have a large variation in flow rate.
NOTE See Annex A for a flow chart illustrating the test procedure specified in this part of ISO 19973.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 1219-1, Fluid power systems and components — Graphical symbols and circuit diagrams — Part 1:
Graphical symbols for conventional use and data-processing applications
ISO 5598, Fluid power systems and components — Vocabulary
ISO 6953-1, Pneumatic fluid power — Compressed air pressure regulators and filter-regulators — Part 1:
Main characteristics to be included in literature from suppliers and product-marking requirements
ISO 6953-3, Pneumatic fluid power — Compressed air pressure regulators and filter-regulators — Part 3:
Alternative test methods for measuring the flow-rate characteristics of pressure regulators
1)
ISO 19973-1:— , Pneumatic fluid power — Assessment of component reliability by testing — Part 1: General
procedures
ISO 80000-1, Quantities and units — Part 1: General
IEC 60050-191, International Electrotechnical Vocabulary. Chapter 191: Dependability and quality of service
1) To be published. (Revision of ISO 19973-1:2007)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 5598, ISO 6953-1, ISO 19973-1,
and IEC 60050-191 app
...
DRAFT INTERNATIONAL STANDARD ISO/DIS 19973-4
ISO/TC 131 Secretariat: ANSI
Voting begins on Voting terminates on
2012-10-03 2013-01-03
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION МЕЖДУНАРОДНАЯ ОРГАНИЗАЦИЯ ПО СТАНДАРТИЗАЦИИ ORGANISATION INTERNATIONALE DE NORMALISATION
Pneumatic fluid power — Assessment of component reliability
by testing —
Part 4:
Pressure regulators
Transmissions pneumatiques — Évaluation par essais de la fiabilité des composants —
Partie 4: Régulateurs de pression
[Revision of first edition (ISO 19973-4:1997)]
ICS 23.100.01
To expedite distribution, this document is circulated as received from the committee
secretariat. ISO Central Secretariat work of editing and text composition will be undertaken at
publication stage.
Pour accélérer la distribution, le présent document est distribué tel qu'il est parvenu du
secrétariat du comité. Le travail de rédaction et de composition de texte sera effectué au
Secrétariat central de l'ISO au stade de publication.
THIS DOCUMENT IS A DRAFT CIRCULATED FOR COMMENT AND APPROVAL. IT IS THEREFORE SUBJECT TO CHANGE AND MAY NOT BE
REFERRED TO AS AN INTERNATIONAL STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS BEING ACCEPTABLE FOR INDUSTRIAL, TECHNOLOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON OCCASION HAVE TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL TO BECOME
STANDARDS TO WHICH REFERENCE MAY BE MADE IN NATIONAL REGULATIONS.
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT, WITH THEIR COMMENTS, NOTIFICATION OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPORTING DOCUMENTATION.
© International Organization for Standardization, 2012
ISO/DIS 19973-4
Copyright notice
This ISO document is a Draft International Standard and is copyright-protected by ISO. Except as permitted
under the applicable laws of the user’s country, neither this ISO draft nor any extract from it may be
reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic,
photocopying, recording or otherwise, without prior written permission being secured.
Requests for permission to reproduce should be addressed to either ISO at the address below or ISO’s
member body in the country of the requester.
ISO copyright office
Case postale 56 CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Reproduction may be subject to royalty payments or a licensing agreement.
Violators may be prosecuted.
ii © ISO 2012 – All rights reserved
ISO/DIS 19973-4
Contents Page
Foreword . iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Symbols and units . 2
5 Test equipment . 2
5.1 Basic test equipment . 2
5.2 Directional control valve . 3
5.3 Connecting piping and volumes . 3
6 Test conditions . 4
6.1 General test conditions. 4
6.2 Inlet and outlet pressures . 4
7 Test procedure . 4
7.1 Timing of checks and measurements . 4
7.2 Type and scope of checks and measurements . 4
7.2.1 Functional check . 4
7.2.2 Set pressure and leakage measurements . 4
7.3 Endurance test . 5
8 Failure criteria and threshold levels . 6
8.1 General . 6
8.2 Functional failure . 6
8.3 Failure due to leakage . 6
8.4 Failure due to pressure characteristics . 6
9 Data analysis . 7
10 Test report . 7
11 Identification statement (reference to this part of ISO 19973) . 7
Annex A (informative) Flow chart illustrating the test procedure specified in this part of
ISO 19973 . 8
Annex B (informative) Expanded test circuit . 9
Bibliography . 10
ISO/DIS 19973-4
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 19973-4 was prepared by Technical Committee ISO/TC 131, Fluid power systems, Working Group 4,
Pneumatic component reliability.
ISO 19973 consists of the following parts, under the general title Pneumatic fluid power — Assessment of
component reliability by testing:
Part 1: General procedures
Part 2: Directional control valves
Part 3: Cylinders with piston rod
— Part 4: Pressure regulators
__ Part 5: Non-return valves, shuttle valves, dual pressure valves (AND function), one-way adjustable flow
control valves, quick-exhaust valves
iv © ISO 2006 – All rights reserved
ISO/DIS 19973-4
Introduction
In pneumatic fluid power systems, power is transmitted and controlled through a gas under pressure within a
circuit. Pneumatic fluid power systems are composed of components and are an integral part of various types
of machines and equipment. Efficient and economical production requires highly reliable machines and
equipment. Within the ISO 19973 series, this part 4 is intended to provide requirements and test conditions
that permit the assessment of the inherent reliability of pneumatic pressure regulators.
It is necessary that machine producers know the reliability of the components that make up their machine’s
pneumatic fluid power system. Knowing the reliability characteristic of the component, the producers can
model the system and make decisions on service intervals, spare parts inventory and areas for future
improvements.
There are three primary levels in the determination of component reliability:
a) preliminary design analysis – finite element analysis (FEA), failure mode and effect analysis (FMEA)
b) laboratory testing and reliability modelling – physics of failure, reliability prediction, pre-production
evaluation
c) collection of field data – maintenance reports, warranty analysis.
Each level has its application during the life of a component. A preliminary design analysis is useful to identify
possible failure modes and eliminate them or reduce their effect on reliability. When prototypes are available,
in-house laboratory reliability tests are run and initial reliability can be determined. Reliability testing is often
continued into the initial production run and throughout the production lifetime as a continuing evaluation of
the component. Collection of field data is possible when products are operating and data on their failures are
available.
DRAFT INTERNATIONAL STANDARD ISO/DIS 19973-4
Pneumatic fluid power — Assessment of component reliability
by testing — Part 4: Pressure regulators
1 Scope
This part of ISO 19973 provides test procedures for assessing the reliability of pneumatic pressure regulators
by testing and the methods of reporting the results of testing. General test conditions and the calculation
method are provided in part 1 of ISO 19973. The methods specified in that part of ISO 19973 apply to the first
failure, as obtained with the three-points moving average (3PMA) method, without repairs, but excluding
outliers.
The lifetime of pneumatic pressure regulators is usually given as a number of cycles. Therefore, whenever
the term “time” is used in this part of ISO 19973, this variable shall be understood as either cycles or time.
This part of ISO 19973 applies to manually adjustable and remote-piloted pressure regulators, both relieving
and non-relieving. This part of ISO 19973 does not apply to pressure regulators that have a permanent bleed.
This part of ISO 19973 also specifies test equipment and failure criteria (threshold levels) for tests to assess
the reliability of pneumatic pressure regulators.
The life determined by the method in this part of ISO 19973 and in ISO 19973-1 will be more closely related to
applications that have a large variation in flow rate.
NOTE See Annex A for a flow chart illustrating the test procedure specified in this part of ISO 19973.
2 Normative references
The following referenced documents are indispensable for the application 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.
ISO 1219-1, Fluid power systems and components — Graphic symbols and circuit diagrams — Part 1:
Graphic symbols for conventional use and data-processing applications
ISO 5598, Fluid power systems and components — Vocabulary
ISO 6953-1, Pneumatic fluid power — Compressed air pressure regulators and filter-regulators — Part 1:
Main characteristics to be included in literature from suppliers and product-marking requirements
ISO 6953-3:201X, Pneumatic fluid power — Compressed air pressure regulators and filter-regulators —
Part 3: Alternative test methods for measuring the flow-rate characteristics of pressure regulators (to be
published)
ISO 19973-1:201X, Pneumatic fluid power — Assessment of component reliability by testing—– Part 1:
General procedures (to be published)
ISO 80000-1, Quantities and units – Part 1: General
IEC 60050-191, International Electrotechnical Vocabulary, chapter 191: Dependability and quality of service
ISO/DIS 19973-4
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 5598, ISO 6953-1, ISO 19973-1,
and IEC 60050-191 apply. Where a conflict of definitions exists for a term in any of these four documents, the
following priority order shall apply: first, ISO 19973-1; second, ISO 6953-1; third, ISO 5598; and fourth,
IEC 60050-191.
4 Symbols and units
4.1 The units of measurement are in accordance with ISO 80000-1.
4.2 The graphic symbols used in this part of ISO 19973 conform to the requirements of ISO 1219-1.
5 Test equipment
5.1 Basic test equipment
5.1.1 Each pressure regulator to be tested (test unit) shall be installed in a test circuit that includes the
components shown in either Figure 1 or
...
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