Pneumatic fluid power —
Assessment of component
reliability by testing
Iso 19973
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), oneway
adjustable flow control valves, quickexhaust valves
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.
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,
which can be determined from laboratory testing, 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, preproduction
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.
Specific component test procedures and exclusions are provided in ISO 19973-2, ISO 19973-3,
ISO 19973-4 and ISO 19973-5.
Assessment of component
reliability by testing
Iso 19973
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), oneway
adjustable flow control valves, quickexhaust valves
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.
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,
which can be determined from laboratory testing, 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, preproduction
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.
Specific component test procedures and exclusions are provided in ISO 19973-2, ISO 19973-3,
ISO 19973-4 and ISO 19973-5.
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