ISO 6953-3:20 12规定了用于测试使用可压缩流体（即气体）的气动流体动力部件的替代测试方法。ISO 6953的这一部分仅适用于前向流和泄流特性滞后曲线的流量递减部分。此方法可应用于以下情况: 与充电和放电测试期间压力变化的响应相比，被测部件的压力调节动态足够快，可以忽略不计； 压力响应不显示任何过冲或任何振荡行为。 ISO 6953-3:20 12规定了测试安装、测试程序和结果呈现的要求。 给出了测试结果的例子，以及各种数据处理方法，和数据处理程序的可视化。还给出了调节压力响应的过冲和下冲以及入口压力的大变化的说明。 ISO 6953-3:20 12适用于以下组件: 符合ISO 6953-1的压缩空气压力调节器和过滤器调节器； 符合ISO 10094的电动气动压力控制阀； 其他部件，如安全阀。

ISO 6953-3:2012 specifies alternative test methods for testing pneumatic fluid power components that use compressible fluids, i.e. gases. This part of ISO 6953 is applicable only to the decreasing flow rate part of the hysteresis curve of forward flow and relief flow characteristics. This method can be applied when:

• the pressure regulation dynamics of a component under test is rapid enough to be negligible, compared to the response of pressure changes during charge and discharge tests;
• the pressure response does not show any overshoot or any oscillating behaviour.

ISO 6953-3:2012 specifies requirements for the test installation, the test procedure and the presentation of results. Examples of test results are given, as well as various data processing methods, and visualization of data processing procedures. Illustrations of overshoot and undershoot on regulated pressure response and large variations on inlet pressure are also given. ISO 6953-3:2012 applies to the following components:

• compressed air pressure regulators and filter-regulators according to ISO 6953-1;
• electro-pneumatic pressure control valves according to ISO 10094;
• other components such as relief valves.