On plug stroke length determination at pneumatic valve distributors

Résumé

The values of operational distribution parameters for the usually pneumatic drive are very important for adequate function of these systems. The common approximations done in their calculus may generate errors. That is why for the situation when transit flow rate must be calculated with high precision; the real flow area has a major role for this. In this paper this area is compute as a function of stroke length for the valve distributors with truncated cone plug. The maximum stoke length for the two kinds of plugs (truncated cone and cone) were also calculated. The variation of maximum stroke length with cone angle was studied for cone plugs. Finally a comparison between the maximum stroke lengths for different cone angle was done.