Draining device and the use thereof

Abstract From the Canadian patent

A draining device removes excess liquid in devices of the type wherein liquid is pumped from a liquid supply to a location of use and excess liquid is collected and removed periodically. There is at least one draining conduit connected to a suction conduit extending between the liquid supply and the location of use. A valve keeps the or each, draining conduit closed when the amount of collected excess liquid is below a preselected limit value the location of, use then being supplied with liquid only from the liquid supply, The or each valve opens the corresponding draining conduit when the amount of collected excess liquid exceeds the limit value so as to re-circulate the collected excess …