| 摘要 |
The invention concerns a valve (1) for measuring a liquid or powdery product, comprising a fixed conduit (5) for supplying the product; a closure (13) mounted at a lower end (11) of the conduit (5); and a coaxial sleeve (15), mounted outside the conduit (5), having a lower end (19) shaped into a valve seat, said sleeve (15) being mobile in translation relative to the conduit (5) between a so-called closed position wherein the valve seat (19) co-operates tightly with the closure (13), and a so-called open position wherein the valve seat (19) is spaced apart from the closure (13) to allow the product to flow. |
