Abstract: A feed-control valve for use in a pipe for pneumatically conveying a granular material or transporting a sticky liquid comprises a tubular valve housing, a valve ring having the same inside diameter as that of the tubular valve housing and angularly movably disposed therein, a plurality of flexible, strong and highly stretch resistant and cord spans connected between the valve housing and the valve ring at substantially equally spaced angular positions along their inner surfaces and each span having a length which is substantially the same as the inside diameter of the valve housing or valve ring, and a flexible and strong inner tube mounted in the valve housing and the valve ring and disposed radially inwardly of the plurality of cord spans. The inner tube can be contracted or squeezed radially inwardly by the cord spans from a fully-open position to a fully-closed position in response to angular movement of the valve ring with respect to the valve housing.