ISO 19973-4:2007
(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 19973-4:2007 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 without repairs, but exclude outliers. ISO 19973-4:2007 applies to manually adjustable and remote-piloted pressure regulators, both relieving and non-relieving. ISO 19973-4:2007 does not apply to pressure regulators that have a permanent bleed. ISO 19973-4:2007 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
General Information
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 19973-4
First edition
2007-08-01
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 19973-4:2007(E)
©
ISO 2007
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ISO 19973-4:2007(E)
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ISO 19973-4:2007(E)
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 . 3
6 Test conditions . 3
6.1 General test conditions. 3
6.2 Inlet and outlet pressures . 3
6.3 Pressure-cycle trace for the endurance test. 3
7 Test procedure . 3
7.1 Selection of test units. 3
7.2 Timing of checks and measurements. 3
7.3 Type and scope of checks and measurements . 4
7.4 Endurance test . 4
8 Threshold levels. 5
8.1 General. 5
8.2 Functional failure. 5
8.3 Failure due to leakage . 5
8.4 Failure due to pressure characteristics. 6
9 Data analysis . 6
10 Test report . 6
11 Identification statement. 6
Annex A (informative) Flow chart illustrating the test procedure specified in this part of ISO 19973 . 7
Bibliography . 8
© ISO 2007 – All rights reserved iii
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ISO 19973-4:2007(E)
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.
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
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ISO 19973-4:2007(E)
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.
Machine producers need to 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, the 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 specific 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.
© ISO 2007 – All rights reserved v
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INTERNATIONAL STANDARD ISO 19973-4:2007(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 without
repairs, but exclude 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 cycles.
This part of ISO 19973 applies to manually adjustable and remote-piloted pressure regulators, both relieving
and non-relieving. This
...
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