Method and apparatus for furnishing process machines with liquid color from a supply thereof provides a loop conduit having respective ends receiving liquid color from the supply and discharging liquid color back into the supply, pumping liquid color through the loop conduit and discharging liquid color from the loop conduit at an intermediate position into a reservoir associated with a process machine upon liquid color level in the reservoir being at a low level limit.

The present invention relates to a draining device for discharging the water contained in a fuel filter manifold, including a draining solenoid valve comprising a valve body (1, 2) provided with a draining channel (17), a coil winding (10), a piston (8, 12) arranged such as to be movable between a passive position for closing the draining channel (17) and an active opening position allowing the water to be drained, the movement of the piston being controlled by the coil, characterized in that the valve body includes a first portion (1) that is integral with the manifold of said filter, the coil (10) and the electric circuit (3) being embedded by molding in said first portion (1) and a second portion (2) removably mounted on the lower end of the first portion (1) and provided with the draining channel (17).

An apparatus for detecting an error in the measurement of a water level in a washing machine includes a water level sensor measuring a water level in a washing tub; a water supply and drain device supplying water to the washing tub or discharging water from in the washing tub; and a control unit controlling the water supply and drain device to adjust the water level in the washing tub, and detecting a measurement error of the water level sensor based on a water level change measured by the water level sensor while the water level is adjusted.

An automatic water drain apparatus includes a reservoir, a fluid inlet, and a fluid outlet. A first valve member is moveable between an open position for admitting fluid to the reservoir via the fluid inlet and a closed position for preventing admission of fluid to the reservoir. A second valve member is moveable between an open position for exhausting fluid from the reservoir and a closed position for preventing exhaust of fluid from the reservoir. At least one actuator is operable to move the fluid inlet and the fluid outlet between their respective open and closed positions. A sensor is disposed outside the reservoir and is operable to produce a first sensor output signal in response to detection of the presence of water, wherein the at least one actuator moves the first valve to the open position in response to the first sensor output signal.

A system is provided to control fluid flow in a wastewater treatment system through wastewater level manipulation. The wastewater treatment system may include a wastewater treatment plant connected to a plurality of pump stations by a main. Each of the plurality of pump stations may include a wet well with a pump therein. The system may include a central server in communication with a sensor to sense a level of wastewater within the wet well. The pump may be automatically moved to an on position when the level of the wastewater in the wet well is at or above a first level and may be automatically moved to an off position when the level of the wastewater in the respective wet well is at or below a pump cutoff level. The central server may systematically manipulate the first level to selectively set the level of wastewater within the wet well.

Fill level monitoring relates to a method for controlling the fill level of a collecting vessel, wherein the collecting vessel could be filled with a dielectric medium. A fill level is monitored by a monitoring circuit with a measuring capacitor, the capacity of which changes steadily in correlation with the fill level, at least beyond a fill level range of the collecting vessel. The method includes: determining a capacity of the measuring capacitor; determining the quality of the measuring capacitor; determining a permittivity of the dielectric medium on the basis of the quality of the measuring capacitor; determining a fill level of the collecting vessel on the basis of the determined capacity of the measuring capacitor and the permittivity of the dielectric medium; and fill level-dependent drainage of the dielectric medium from the collecting vessel.