Automatic level control system for a fluid in a pressureless reservoir supplied by a pressure line

摘要

For many problems in an unpressurized reservoir an approximate level must be maintained. Refilling from the pressure line takes place in known systems either with a solenoid valve, which is controlled by a level measurement, or with a float, which operates the valve directly. The level measurement is complex and possibly error prone, while the float valve can be installed in small containers poor and with its moving parts is also a source of error. By an additional pressure-resistant container, which is installed at approximately the same height as the reservoir and connected at the top and bottom by a line with a throttle element to the reservoir and which is connected to a controllable valve to the pressure line, by opening the valve for a constant time, the level in the reservoir are kept approximately constant when similar amounts are removed between refills.