| 摘要 |
An air supply valve 300 for connection between a compressed air cylinder and a respirator of a breathing apparatus. The air supply valve 300 comprises a valve body having a first inlet for connection to an air supply cylinder, a second inlet 310 including a coupling for connection to an auxiliary air supply, an outlet for the supply of air to a respirator and, a switching means 330 to selectively communicate the first inlet or the second inlet 310 with the outlet for the supply of air thereto. The switching means comprises a spool valve 330 in the first inlet to open and close an airflow passage therefrom and, an actuator 331 associated with the second inlet 310 operable to close the spool valve 330 when an auxiliary air supply 322 is connected to the second inlet 310. |
