ISO 19973-5:2015

ISO 19973-5:2015 provides test procedures for assessing the reliability of the following types of pneumatic valves:
-   non-return (check) valves;
-   pilot-operated non-return valves;
-   shuttle valves;
-   dual pressure valves (AND function);
-   one-way adjustable flow control valves;
-   quick-exhaust 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 these pneumatic valves is usually given as a number of cycles. Therefore, whenever the term "time" is used in this part of ISO 19973-5:2015, this variable is understood as a number of cycles.
ISO 19973-5:2015 also specifies test equipment and threshold levels for tests to assess the reliability of these pneumatic valves.