| 摘要 |
The system comprises a D.C motor (1) which is speed regulated by voltage variation. The motor direction of rotation can be altered by pole change of the fed-in current. The motor (1) drives a pump (2), the suction and pressure sides of which are changed by rotation direction alteration, and capacity (fluid amount) is varied with the speed. To each pump side are connected a max. pressure valve (3) for restriction of fluid pressure, a check valve (4) for fluid feed to the pump, a throttle (5) for conducting fluid from the pump, and, in certain cases, also from a connected regulator object. - A further second throttle (6) permits a small amount of fluid to circulate around the system to bleed if of air. Also, air and gas can be fed to a tank by the first throttle (5). Finally, a regulator cylinder (7) is connected to the pump, and the system can be completed with an electrical feed-back (8) for position determination of the cylinder (7), working in conjunction with a comparator (9) controlled by a manoeuvring unit (10). |
