Porting

Trang has been working very hard on porting features from the old design to the new design.

[…] portings distributed radially about the housing bore. It then is necessary only to arrange six equally spaced portings at the outside diameter of the control sleeve which rotates within the housing, and to size these portings […]

[…] portings in said tracer valve to said cylinder inlet port in said servo valve unit for actuating said servo valve member from said set position to control fluid flow through said inlet and outlet portings in said servo valve unit […]