| 摘要 |
The invention relates to a valve arrangement (13) for controlling the flow of pressurized-air, water and/or other media to at least one hand-operated tool (6-9), preferably an instrument for dental work. The valve arrangement (13) includes for each tool (6-9) a valve for each medium. According to the invention, each valve comprises a first valve part (14) and a second valve part (15), those valve parts being arranged for relative movement between an open and a closed position under the influence of actuating means (11, 12) and further comprises a flexible hose (16) connected at respective ends to the two first and second valve parts (14, 15). When the valve parts (14, 15) occupy their valve-closed position, the part of the hose (16) located between the two valve parts is folded so as to exhibit a flow-inhibiting fold or kink (30), whereas when the valve parts (14, 15) occupy their valve-open positions the flow-inhibiting fold (30) is no longer present in the hose (16). |
