| 摘要 |
A water discharge valve comprising a longitudinal surrounding valve housing (2) arranged at a first end portion and an outlet member (3) adjacent to a second end portion, and having a control member (8) by said second end portion, arranged to accomplish movement of a valve cone (5) towards/from a valve seat located adjacent to the first end portion. A tubular shaft communicates with the atmosphere and a valve means (V) is arranged to close the opposite end portion of the tubular shaft (7) by water pressure flowing through the valve housing (2) to the outlet member (3). The valve means (V) opens communication from the internal part of the tubular shaft (7) to the valve housing (2) when said water pressure is lost. Opening of the valve means (V) supplying air into the valve housing (2) simultaneously results in closing of a portion of the valve housing (2), surrounding the valve cone (5), for communication with the part of the valve housing (2) surrounding the tubular shaft (7). <IMAGE> |
