Abstract: In the ISO6358 standard about determination of flow rate characteristics of pneumatic component, there is no prescript to small valves. Using size converting standard fittings, flow rate characteristics experiment of the small valves with the standard fittings were carried out. Compared to the results of caliper-type measurement, the effect of the standard fittings on the flow rate characteristics of small valve is confirmed. A new resultant method of flow rate characteristics is proposed. There is good agreement between the resultant results and the experiment ones. It is proved applicable for the proposed resultant method. The feasibility of calculating the flow rate characteristics of the valve itself is also discussed.

Key words: Flow rate characteristics, Resultant, Small pneumatic valve, Standard fitting