ISO 19973-2:2015提供了通过测试评估气动方向控制阀可靠性的测试程序和报告测试结果的方法。ISO 19973-1中提供了一般试验条件和计算方法。ISO 19973-1中规定的方法适用于第一次故障，如使用三点移动平均（3PMA）方法获得的，无需修复，但不包括异常值。 气动和电动气动方向控制阀的使用寿命通常以循环次数表示。因此，当ISO 19973-2:2015本部分中使用术语“时间”时，该变量应理解为周期。 ISO 19973-2:2015还规定了用于评估气动方向控制阀可靠性的试验设备和阈值水平。

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.