Grooved butterfly valves direct connect to pipe using iron pipe size couplings. Grooved valves are easiest to install. 管状蝶阀:采用铸铁管接头直接与管道连接。管状阀门安装最容易。
Method : Taken away the flat iron circle used as a tooth pad from an ordinary oropharyngeal airway, the new device is made by fixing an air pipe in size 8 or 9 at the connector. 方法:取出口咽通气管作牙垫用的扁形铁圈,插入8号~9号一次性气管导管接头。