| 摘要 |
A selector valve (4) which automatically cutsoff the flooded vent line (6, 7) from the inoperative chamber of a hydro-kinetic brake comprises two self-sealing ball valves (9, 10), one in each vent line. A balance beam (15) extends between the two valves (9, 10) so that the first to close tips the beam (15) towards the other valve preventing it from sealing. A common passage (17) leads from these two valves (9, 10) to an atmospheric vent port (24) closable by a third ball-valve (22, 23) and a connection (8) to a pressure actuated friction brake system. When the second vent line floods the third valve (22, 23) seals the vent port (24) permitting pressure to build up in the friction brake system. |
