ISO 19973-2:2015 PDF

Pneumatic fluid power — Assessment of component reliability by testing — Part 2: Directional control valves

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Title (English):

ISO 19973-2:2015

Pneumatic fluid power — Assessment of component reliability by testing — Part 2: Directional control valves

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 14
Publication date:: September 1, 2015
Edition:: ISO IS 19973 edition 2 version 1
ICS:: 23.100.01

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Description (English):

ISO 19973-2:2015 provides test procedures for assessing the reliability of pneumatic directional control valves 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 and electro-pneumatic directional control valves is usually given as a number of cycles. Therefore, whenever the term "time" is used in this part of ISO 19973-2:2015, this variable is to be understood as cycles. ISO 19973-2:2015 also specifies test equipment and threshold levels for tests to assess the reliability of pneumatic directional control valves.

Technical details

Technical committee: ISO/TC 131 - Fluid power systems
SKU: ISO 19973-2:2015

Abstract

Overview

ISO 19973-2:2015 - "Pneumatic fluid power - Assessment of component reliability by testing - Part 2: Directional control valves" specifies test procedures, equipment and reporting methods for assessing the reliability of pneumatic and electro-pneumatic directional control valves. It complements ISO 19973-1 (general procedures) and defines how lifetime is expressed (cycles), how the three-points moving average (3PMA) method is applied to determine first failure (without repairs, excluding outliers), and the threshold levels used to judge failures.

Key Topics and Requirements

Scope and lifetime unit: Lifetime is expressed in cycles; whenever the standard uses “time” it means cycles.
Test equipment: Basic circuits for testing two-position (bi-stable and mono‑stable) and three‑position valves, rules for silencers, pilot supply and safety considerations.
Connecting piping and volumes: Guidance to avoid flow restrictions; keep tubing short so volumes charge/vent within control-signal timing.
Test conditions: Initial functional checks; cycling requirements (outlet pressures must fall below 10% and rise above 90% of supply during a cycle); actuation on/off ratio 1:1.
Control signals: Defined patterns for mono‑stable and bi‑stable/three‑position valves to ensure reproducible cycling.
Checks and measurements:
- Functional checks (acoustic, visual, tactile) to detect switching failures or incomplete charging.
- Leakage measurements (functional leakage and specific internal/external pilot leak checks depending on valve type).
- Measurement of shifting pressures (performance change over cycles).
Failure criteria and thresholds: Criteria for functional failure, leakage failure and shifting-pressure failure; customizable agreements allowed between parties.
Data analysis and reporting: Use methods from ISO 19973-1 for statistical analysis and prepare a standardized test report.

Applications and Users

ISO 19973-2:2015 is intended for:

Valve manufacturers - for design validation, production testing and reliability claims.
Test laboratories and OEMs (machine builders) - to evaluate component reliability, set maintenance intervals, and optimize spare-part inventories.
Reliability and quality engineers - for reliability modelling, warranty analysis and continuous improvement. Practical uses include predicting valve lifetime in cycles, establishing service schedules, and informing FMEA, design changes and production acceptance tests.

Related Standards

ISO 19973-1 (General procedures)
ISO 1219-1 (Graphical symbols)
ISO 5598 (Vocabulary)
ISO 8778 (Standard reference atmosphere)
ISO 80000-1 (Units)
IEC 60050-191 (Dependability vocabulary)

Keywords: ISO 19973-2:2015, pneumatic directional control valves, reliability testing, 3PMA, leakage measurement, cycling frequencies, test procedures, threshold levels.

Related standards

Standards mentioned in the description

Abstract

Overview

Key Topics and Requirements

Scope and lifetime unit: Lifetime is expressed in cycles; whenever the standard uses “time” it means cycles.
Test equipment: Basic circuits for testing two-position (bi-stable and mono‑stable) and three‑position valves, rules for silencers, pilot supply and safety considerations.
Connecting piping and volumes: Guidance to avoid flow restrictions; keep tubing short so volumes charge/vent within control-signal timing.
Test conditions: Initial functional checks; cycling requirements (outlet pressures must fall below 10% and rise above 90% of supply during a cycle); actuation on/off ratio 1:1.
Control signals: Defined patterns for mono‑stable and bi‑stable/three‑position valves to ensure reproducible cycling.
Checks and measurements:
- Functional checks (acoustic, visual, tactile) to detect switching failures or incomplete charging.
- Leakage measurements (functional leakage and specific internal/external pilot leak checks depending on valve type).
- Measurement of shifting pressures (performance change over cycles).
Failure criteria and thresholds: Criteria for functional failure, leakage failure and shifting-pressure failure; customizable agreements allowed between parties.
Data analysis and reporting: Use methods from ISO 19973-1 for statistical analysis and prepare a standardized test report.

Applications and Users

ISO 19973-2:2015 is intended for:

Valve manufacturers - for design validation, production testing and reliability claims.
Test laboratories and OEMs (machine builders) - to evaluate component reliability, set maintenance intervals, and optimize spare-part inventories.
Reliability and quality engineers - for reliability modelling, warranty analysis and continuous improvement. Practical uses include predicting valve lifetime in cycles, establishing service schedules, and informing FMEA, design changes and production acceptance tests.

Related Standards

ISO 19973-1 (General procedures)
ISO 1219-1 (Graphical symbols)
ISO 5598 (Vocabulary)
ISO 8778 (Standard reference atmosphere)
ISO 80000-1 (Units)
IEC 60050-191 (Dependability vocabulary)

Keywords: ISO 19973-2:2015, pneumatic directional control valves, reliability testing, 3PMA, leakage measurement, cycling frequencies, test procedures, threshold levels.

ISO 19973-2:2015 PDF

Technical details

Abstract

Overview

Key Topics and Requirements

Applications and Users

Related Standards

Related standards

Abstract

Overview

Key Topics and Requirements

Applications and Users

Related Standards

Related standards

Pneumatic fluid power — Assessment of component reliability by testing — Part 1: General procedures

Fluid power systems and components - Graphical symbols and circuit diagrams - Part 1: Graphical symbols for c…

Fluid power systems and components — Vocabulary

Pneumatic fluid power -- Standard reference atmosphere

Quantities and units - Part 11: Characteristic numbers - Amendment 1 (ISO 80000-11:2019/Amd 1:2025)

Amendment 2 - International Electrotechnical Vocabulary (IEV) - Part 191: Dependability and quality of service