| 摘要 |
A duct interception device of a machine suitable for the treatment of food mixtures comprises a butterfly valve (12, 12', 12''), equipped with a circumferential sealing portion on a duct (15), and activation devices (13) of said valve (12, 12', 12''). According to the invention, said circumferential sealing portion is pressurized with a pneumatic circuit (14) for the inlet of compressed air. <IMAGE> |
