| 摘要 |
Ventilators and anesthetic systems are generally equipped with a number of different safety functions. An improved, manually operated safety valve device has a valve element, slideingly or rotatably arranged in a valve seat inside a valve body. The valve element is connected to an operating element. In a sliding embodiment, when the operating element is not actuated the valve element is retained in a first position by a spring, which presses against the operating element. When the operating element is partly depressed, a gas channel is exposed to an input channel and gas can pass to an output channel at a first defined flow rate. The operating element can be affixed in this position by means of an arresting unit. If a larger flow of gas is needed, the operating element can be completely depressed, whereupon a flow-through channel with a lower resistance to flow opens to pass a second defined flow of gas. In a rotating embodiment, the degree of rotation of the valve element results in the same functions as the extent of depression in the sliding embodiment. |
