Ball valve with noise damping means

摘要

A regulation ball valve for a fluid flow in which a ball (14) is rotatable to bring a passage (16) thereof from a limit position of full opening of the valve to a limit position of full closure of the valve and vice versa. Present in the passage (16) are perforated baffles (17) that at least at an intermediate position between the limit positions are passed through by a fluid flow. The perforated baffles (17) comprise two perforated metal sheets (18, 19) between which a layer (20) permeable to the fluid is disposed. In particular the layer can advantageously be formed of chaotically-disposed filaments, like in steel wool.