A butterfly valve comprising an annular valve body, a ring-shaped elastic valve seat fitted to an inner circumference of the valve body, BUTTERFLY VALVESsaid valve seat having diametrically opposed openings, an annular sliding face around each of the openings and at least a pair of recesses charged with lubricant on each sliding face, Butterfly Valvessaid pair of recesses being disposed symmetrically with respect to the respective opening of the valve seat, a valve stem pivotally fitted to the valve body through the openings of the valve seat, and a valve disk fitted to the valve stem, Butterfly Valvessaid valve disk having a pair of annular sliding faces around the valve stem, each sliding face of the valve disk slidably contacting a respective corresponding sliding face of the valve seat during rotation of the valve disk.

MORE NEWS