Patent attributes
A vacuum cleaner for collecting liquid material is capable of continuously operating while periodically discharging liquid from an outlet. The vacuum cleaner includes a tank having first and second chambers and divided by an intermediate apertured wall and a vent located on the second chamber. A pressure responsive drain valve member is associated with a tank outlet. A pressure responsive control valve member associated with the aperture having a normally open position in which the liquid material is allowed to flow through and having a closed position to close off the aperture when a high liquid level is present in the second chamber. The vent reduces the partial vacuum level in the second chamber, thereby to discharge liquid material from the second chamber through the outlet. A reset assembly is provided for reestablishing the partial vacuum level in the tank second chamber.
