ISO 19973-5:2015

Overview

ISO 19973-5:2015 - Pneumatic fluid power - Assessment of component reliability by testing - Part 5 specifies test procedures and reporting methods to assess the reliability of key pneumatic valve types. It covers non-return (check) valves, pilot-operated non-return valves, shuttle valves, dual pressure valves (AND function), one-way adjustable flow control valves, and quick-exhaust valves. The standard defines test equipment, cycling conditions, measurement methods and threshold levels; general procedures and lifetime-calculation methods are provided in ISO 19973‑1. Note: in this part, “time” is expressed as a number of cycles (lifetime = cycles).

Key topics and technical requirements

• Scope of testing: Functional checks, leakage measurement, shifting-pressure measurement and recording of test data for each valve type.
• Failure detection: First-failure determination uses the three-points moving average (3PMA) method as defined in ISO 19973‑1 (no repairs; outliers excluded).
• Test equipment and circuits: Basic circuits, ports identification and volumes are specified; silencers must not restrict flow and connecting tubing should be short to meet timing.
• Cycling conditions: Example requirement - for non-return and one-way flow control valves the outlet pressure in the test volume must drop below 10% and rise above 90% of supply pressure during each cycle. Adjustment screws on one-way adjustable flow controls are locked during tests. Specific cycling sequences are defined for pilot-operated, quick-exhaust, shuttle and dual-pressure valves.
• Data handling: Timing of checks, scope of measurements, recording formats, failure criteria and threshold levels, data analysis and test-report content are prescribed.
• Complementary rules: Units, symbols and graphical symbols conform to ISO 80000-1 and ISO 1219‑1; ports identified per ISO 11727.

Practical applications and users

• Who uses it: Pneumatic component manufacturers, test laboratories, OEMs, machine builders, reliability engineers, R&D teams, quality assurance and maintenance planners.
• Practical value:
  • Provides reproducible test methods to quantify valve lifetime in cycles.
  • Enables comparison of component reliability for procurement and design.
  • Supports reliability modelling, FMEA, maintenance planning, spare-parts inventory and warranty analysis.
  • Helps validate prototype designs and production-quality valves before field deployment.

Related standards

• ISO 19973-1 (General procedures for component reliability testing)
• ISO 1219-1 (Graphical symbols)
• ISO 5598 (Vocabulary)
• ISO 11727 (Port identification)
• ISO 8778 (Standard reference atmosphere)
• ISO 80000-1 (Quantities and units)
• IEC 60050-191 (Dependability vocabulary)

Keywords: ISO 19973-5:2015, pneumatic fluid power, component reliability, non-return valve, shuttle valve, dual pressure valve, one-way adjustable flow control, quick-exhaust valve, test procedures, lifecycle cycles, 3PMA, test equipment, leakage measurement.