Butterfly valve with a sealing element in elastomeric material with an internal metal reinforcement

Abstract From the Canadian patent

Butterfly valve with a sealing element of elastomeric material with an internal metal reinforcement, made of a substantially tubular outer valve body, with flow pipe connections for fluids at its extremities, in which there is a seal of elastomeric material encircling a disc-shaped, internally mobile shutter, equipped with a diametral axis shaft transversal to the valve body axis, protruding out of the same body and bearing the rotation commanding organs the sealing, element being equipped with an inside metal ring axially, extended substantially for the entire length of the same sealing element, and with external sealing reliefs in, correspondence to which there are related seatings in the …