| 摘要 |
Valve means 10 has an internal chamber 11 the entrances 15,16 to which are normally closed by supply and delivery non-return valves 13,14, and has a manually actuable member 18 movable from a blocking position, in which the chamber 11 is sealed, to either of:- a supply position in which the supply valve is held open, and an exhaust position in which the delivery valve is held open and an exhaust path 24,25 from the chamber is opened. |
