Abstract: A processing system includes a processor including a separator, a set configured to cooperate with the separator to separate whole blood into plasma and other components, the set including an inlet line attachable to a patient to receive whole blood and an return line attachable to a patient to return processed fluid, and a source of replacement fluid connected to the disposable set, the processor configured to combine the other components with replacement fluid to define the processed fluid. The processor includes a controller and an input device coupled to the controller, the controller configured to receive an input via the input device, the input representing a volume of replacement fluid, and to control the processor to separate whole blood passing through the set and to combine the other components with the replacement fluid according to the input until the source of replacement fluid is empty.

Abstract: In one aspect, a device for use in a wellbore includes a tubular body; a barrier member associated with an outer surface of the tubular body configured to retain a proppant; an actuating member associated with the barrier member configured to expand the barrier member in an annular direction; and a fluid channel associated with an upper extent and a lower extent of the barrier member, configured to allow a fluid flow therethrough. In another aspect, a method for completing a multi-zone wellbore, includes deploying a barrier device at a downhole location within the wellbore; expanding a barrier member in an annulus of the wellbore; providing proppant in the annulus of the wellbore; retaining the proppant in the annulus via the barrier member; and providing a fluid flow between an upper extent and a lower extent of the barrier member.

Abstract: An automatic drainage device with a level controller is provided with a tank, a level detection member 3, an isolation layer, and a control unit. The tank has a water storage space. The level detection member is fixed to the tank and includes a fixing portion to be fixed to the tank, and a detection portion connected to the fixing portion and disposed in the water storage space. The detection portion includes a first detection section connected to the fixing portion, and a second detection section connected to the first detection section. The isolation layer is coated on the first detection section of the detection member. The control unit is electrically connected to the level detection member. The automatic drainage device is capable of reducing the possibility of wrong determination of water level.

Abstract: This invention relates to an overfill prevention system for preventing the overfilling of tanks when filling up large tanks from a fuel distribution truck. The system operates by monitoring and automatically controlling the filling process by use of a power take off switch assembly that is connected electronically to a secondary overfill prevention system that is also connected to a signal probe located in the tank that is being filled. In operation, once fuel contacts the signal probe, a communicator signal is sent from the signal probe to a secondary overfill prevention system, which interrupts a looping electrical current through a fuel shut off sensor assembly to a power take off switch assembly along a connecting cable.

Abstract: A rail vehicle contains a sanitary system which has a waste water tank and a fresh water tank which are each equipped with associated filling level sensors. A control device is provided for establishing a link in terms of control between the filling levels in the fresh water tank and waste water tank. The control device monitors the filling level in the waste water tank by associated sensors and controls the filling level in the fresh water tank as a function of a measured filling level in the waste water tank.

Abstract: 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 moulding 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?).

Abstract: A fuel supply system includes a fuel tank for holding a volume of fuel and a fuel reservoir disposed within the fuel tank. A fuel pump is provided for pumping fuel from the fuel reservoir to a fuel consuming device. A jet pump is provided in selective fluid communication with the fuel pump through a jet pump line to selectively aspirate fuel from the fuel tank into the fuel reservoir. A fuel level indicator is provided which is responsive to the level of fuel within the fuel reservoir and a valve which is responsive to the fuel level indicator closes the jet pump line when the fuel level indicator indicates that the fuel level reservoir contains a predetermined amount of fuel.

Abstract: A pumpbox, the pumpbox being in fluid communication with one or more vessels, wherein the pumpbox comprises a classification portion and level control means adapted to control the level of fluid within the one or more vessels.

Abstract: 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.

Abstract: A recycling sprinkler system incorporates at least one collection vessel assembly for runoff water, as well as a pump module for recycling a substantial portion of the collected runoff water back into an irrigation sprinkler system along with the primary water source for the irrigation sprinkler system, so that the amount of water required from the primary water source is reduced and a substantial portion of the runoff water is prevented from being discarded.

Abstract: The present invention is directed towards a rainwater collection and distribution device comprising at least one substantially elongate collector tank having an open upper free end and a closed lower free end, whereby the elongate collector tank is dimensioned to fit within a downpipe with its open upper free end exposed to rainwater entering the downpipe; the rainwater collection and distribution device further comprising a connection conduit having a lower open end adjacent the lower closed end of the elongate collector tank, and an upper free end connected to a pump; whereby, a delivery conduit is connected between the pump and a water storage tank. The advantage of providing the pump is that complete control may be exerted over the delivery of the collected rainwater to a water storage tank.

Abstract: An improved apparatus and method for monitoring the levels of propane or other consumable liquid in remotely located storage tanks and coordinating delivery of liquid to those tanks, including an improved method of using the remote monitoring data to identify out-of-ordinary conditions at remote tanks, optimally schedule purchases or deliveries, improve safety, and more efficiently operate a propane dealership. More accurate and timely information concerning the status of customer tanks serves to improve operational efficiencies and increase safety. Data received from remote sensors can be collected and organized so that it is easily understood and utilized through the implementation of a user interface accessible via the Internet that allows the information to be presented in an efficient graphical and contextual fashion.

Abstract: 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 permissivity 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 permissivity of the dielectric medium; and fill level-dependent drainage of the dielectric medium from the collecting vessel.

Abstract: A method of controlling overflow in a below-ground transfer pump sump used in the dispensing of liquid fuels. The method comprises providing a sump having a sump bottom below a level of ground immediately adjacent the sump, providing a storage tank having an internal cavity for the storage of liquid fuel, the storage tank having a conduit in communication with the sump and providing an overflow assembly having an inlet disposed within the sump and an outlet communicating with the conduit. The method includes permitting water from the ground adjacent the sump to enter the sump and mix with any liquid fuel in the sump and if the liquid fuel and water mixture in the sump reaches a predetermined level, allowing the liquid mixture to pass through the overflow assembly, into the conduit and into the storage tank containing the liquid fuel.

Abstract: 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.

Abstract: A water discharge device may include a water collection chamber including a water drainage valve. At least one water sensor may be arranged in a region of the water collection chamger for determining a water level in the water collection chamber and for controlling the water drainage valve. A device may be configured to maintain the water sensor in contact with the water by keeping a water level artificially high in the region of the water collection chamber at the water sensor.

Abstract: An apparatus for the contamination-free drainage of fresh water in an aircraft, the apparatus having a fresh water supply line (8) with a fresh water outlet (2) from which water issues during drainage, and disposed downstream thereof an inlet opening (4) of a line (9), the inlet opening being provided for receiving drainage water and the line (9) being connected to the waste water system of the aircraft, and the fresh water outlet (2) and the inlet opening (4) being disposed in a housing (1) which has an overflow (7).

Abstract: A clothing treating apparatus and a method of controlling such an apparatus are provided. The clothing treating apparatus may make use of a draining function which may be automatically or manually performed after determining whether or not water received in a detachable water supply tank may be re-used or not.

Abstract: An improved apparatus and method for monitoring the levels of propane or other consumable liquid in remotely located storage tanks and coordinating delivery of liquid to those tanks, including an improved method of using the remote monitoring data to identify out-of-ordinary conditions at remote tanks, optimally schedule purchases or deliveries, improve safety, and more efficiently operate a propane dealership. More accurate and timely information concerning the status of customer tanks serves to improve operational efficiencies and increase safety. Data received from remote sensors can be collected and organized so that it is easily understood and utilized through the implementation of a user interface accessible via the Internet that allows the information to be presented in an efficient graphical and contextual fashion.

Abstract: A closed loop geothermal system has a fluid circulation loop that includes in series: a heat pump, a ground loop heat exchanger, a tank flow center and a circulation pump. The tank flow center includes a tank, a first valve, a second valve and a tank bypass line all mounted in a common housing. The tank may include a refill inlet that opens through a top surface of the housing. A cap may be attached to close the refill inlet. The tank flow center has the regular geothermal operation configuration, a system flush configuration, and a refill configuration. The tank flow center may be elevated above the circulation pump a distance to produce a water column that is greater than a minimum cavitation avoidance head pressure for the circulation pump.

Abstract: Systems and methods for determining when a fluid supply container of a blood processing apparatus becomes empty. The system uses a scale to monitor and detect when a fluid supply container is empty based on the rate of change of the container weight and whether the container weight is below a pre-established threshold, and a controller receives a signal from the scale and controls the operation of a pump to stop pumping when the fluid supply container is empty.

Abstract: A control system for a purge valve that can be actuated by low pressure, which can be used for a low pressure or vacuum waste water system, encompassing a first valve and a second valve. The purge valve can be actuated as a function of its position, and the accumulated waste water can be drawn off via the sewage system.

Abstract: Fluidizing transport apparatus comprises a hopper, a pressure vessel and a valve element which controls a port between the hopper and the vessel. The valve element is retained closed against the port under pressure within the vessel. A fluidizing nozzle receives transport fluid, such as water from a fluid line. Water supplied through the fluid line thus fluidizes solids in the vessel and raises the pressure to maintain the valve element in the closed position. The fluidized solids material is then supplied to a transport pipeline from the vessel. Solids material loaded into the hopper depress the valve element when pressure within the vessel is relieved, so allowing a fresh charge of the solids material to enter the vessel for a subsequent cycle. The position of the valve element within the vessel is influenced by a float which responds to the water level within the hopper.

Abstract: A drainage device for draining liquid out of a closed chamber includes an air cylinder, a driving assembly, a first channel, a second channel, a first sealing assembly, a second sealing assembly, and a controller. The air cylinder includes a main body defining a receiving chamber, an action piston positioned in the receiving chamber of the main body, and a connecting rod connected to the action piston. The main body defines a liquid inlet and a liquid outlet, both of which communicate with the receiving chamber, and the presence of a fixed piston with a seal in each of the inlet and outlet creates a double-acting one-way valve when the action piston is moved up and down.

Abstract: A fluid level sensor and drain fitting is provided that includes a fitting body having a first annular end, a second external-threaded end with an opening therein, and a passage extending from the opening to the first annular end. The drain fitting further includes a plurality of sensors forming an array on the second external-threaded end radially spaced around the opening such that at least one sensor is above the centerline of the opening regardless of the rotational position of the fitting. Each of the sensors are configured to provide an output that changes in response to contact with water. The plurality of sensors are configured to detect a water level relative to the opening in the fitting body based on the number of sensors in the array that provide an output indicative of contact with water.

Abstract: Liquid separation systems for installing in liquid distribution installations having a conduit with a first liquid destination, a first liquid supply for supplying a first liquid into the conduit, and a second liquid supply for supplying a second liquid into the conduit via an accessible conduit access unit with an inlet and an outlet in flow communication with the conduit. The liquid separation systems are configured to redirect the second liquid to a second liquid destination different from the first liquid destination.

Abstract: A pressurized wastewater effluent chlorination system including a treatment tank defining a contact chamber and an aeration chamber. The treatment tank receives wastewater effluent. The system includes a pressure vessel within a liquid chlorine storage container positioned in or near the treatment tank. Preferably, the pressure vessel is a floating vessel having a check valve at its bottom, enabling the vessel to fill with a predetermined amount or measured charge of chlorine depending on the position of a float on the vessel. In response to a timer control or float switch, a valve operates to communicate air pressure from a compressor to the vessel to displace the measured charge of liquid chlorine into the wastewater effluent in the contact chamber. Effluent flow and air discharge into the contact chamber enhances mixing of the chlorine and the effluent.

Abstract: A water collection, storage, and distribution system includes one or more individual water storage tanks. Each water storage tank has its own microprocessor that controls the operation of the storage tank so that each storage tank can operate either as a stand-alone storage tank or can be integrated into a series or a daisy chain of storage tanks. Each individual storage tank monitors its water level, its temperature, and its flow rate. When a risk of freezing exists, based on time and temperature, the storage tank can dump water. When the water in the storage tank is approaching stagnation, based on flow rate and time, the storage tank can dump water. When a storage tank is part of a daisy chain of storage tanks, each individual tank monitors not only its own water level but also the water level of the next downstream storage tank and pumps water to the downstream storage tank as required.

Abstract: A reduced pressure treatment system includes a porous pad positioned at a tissue site and a canister having a collection chamber, an inlet, and an outlet. The inlet is fluidly connected to the porous pad. A reduced pressure source is fluidly connected to the outlet of the canister to such that fluid from the tissue site may be drawn into the collection chamber. A hydrophobic filter is positioned adjacent the outlet to prevent liquid from exiting the collection chamber through the outlet. A baffle is positioned within the canister to create a tortuous path between the inlet and the outlet to prevent premature blocking of the hydrophobic filter.

Abstract: A monitor embodiment, monitoring overflow levels in a bathtub, comprises an input water unit, including a control circuitry, coupled to a hot-cold water facet; a water level detection unit including telescopically joined tubes with a floatable lowest tube associated with an indicator, an uppermost tube fixed to the input unit, sensors attached to non-lowest tubes variably coupled. The sensors detect the indicator's position reaching a predetermined alarm or shutoff level, causing respective initiating an alarm signal, or terminating the input unit's water flow. Another embodiment additionally comprises an output water unit associated with the circuitry, incorporating a temperature sensor and a user preset-temperature selector. The output unit outlets cooled water from the bathtub, the input unit inlets hot water until the preset-temperature is reached, provided no alarm signal was issued. An additional sensor, incorporated in the input unit, allows adding the hot water when it's hotter than the bathtub water.

Abstract: Provided is a fuel cartridge in which a follower is prevented from being deformed and from separating even when heavy vibration is exerted onto the fuel cartridge. The fuel cartridge is detachably connected with a fuel cell main body and assumes a construction in which the fuel cartridge is equipped with a fuel-storing vessel for storing a liquid fuel, a fuel discharge part, and a follower which seals the liquid fuel and moves as the liquid fuel is consumed at a rear end part of the liquid fuel. The follower is provided with a follower auxiliary member and a cap member both of which have no fluidity and are insoluble in the liquid fuel.

Abstract: A recycling sprinkler system incorporates at least one collection vessel assembly for runoff water, as well as a pump module for recycling a substantial portion of the collected runoff water back into an irrigation sprinkler system along with the primary water source for the irrigation sprinkler system, so that the amount of water required from the primary water source is reduced and a substantial portion of the runoff water is prevented from being discarded.

Abstract: Provided are an air conditioner with a humidifier and an air conditioning system. The humidifier is modularized within the air conditioner, enabling humidifying to be performed together with air conditioning. Moreover, by providing the humidifier as a module, indoor space utilization efficiency is improved, and a multi-function, low-cost air conditioner can be manufactured. Furthermore, the humidifier can be linked in operation to the air conditioner, allowing air discharged from the air conditioner to be distributed evenly across an indoor space.

Abstract: A waste pumping system is provided that includes a tank having a floor, a body, and a tank inlet. Embodiments include those wherein the system includes a first designated area formed by a first baffle portion and the body, a second designated area formed by a second baffle portion and the body, and a third baffle portion for directing material toward the first designated area. In some embodiments, the system includes a pump substantially disposed within the first designated area and a sensing system substantially disposed within the second designated area for activating the pump when material within the tank reaches a predetermined level.

Abstract: The invention provides a protection system for a fluid compartment of variable volume. The protection system comprises a detection means for detecting when the volume of the fluid compartment is outside a predetermined acceptable limit. The protection system also comprises a valve arrangement mountable on at least one port that is in selective fluid communication with the fluid compartment. The protection system further comprises an actuator, wherein the detection means is coupled to the valve arrangement via the actuator. When the detection means detects that the volume of the fluid compartment is outside the predetermined limit, the actuator causes the valve arrangement to change state and alters the volume of the fluid compartment. The protection system can be used with a compensator to protect a movable part of the compensator from damage.

Abstract: A steam trap system including a steam trap having a steam inlet and a water collector that can collect water. An orifice arrangement is included having a plurality of valved orifices spaced apart from each other at different heights. Selected valved orifices can be configured to open as water in the water collector rises and reaches the height of the selected valved orifices, allowing the water to be removed from the water collector.

Abstract: A water reservoir which uses a corrugated metal tube as its main body. A solid plate seals one end of said corrugated metal tube and another solid plate seals the other end. The Corrugated metal tube has an opening at the top on which is secured a collar. A sleeve slides over the collar and extends up to ground level.

Abstract: A controller for a grey water retention system which utilizes a programmable logic controller to control the dispersal of the grey water. The controller receives a signal from a water sensor showing the level of grey water within a holding tank/reservoir. This signal is sent to a remote computer. When an activation signal from the remote computer is received, the programmable logic controller activates a pump to deliver the grey water to an irrigation system.

Abstract: A grey water control system utilizing a computer configured to selectively disburse grey water as required. This disbursement is to: irrigate plants on the site of the business where the grey water is collected; irrigate plants on a site remote from the location where the grey water is collected; or, discharge of the grey water into a water disposal mechanism.

Abstract: A liquid recovery apparatus of the present invention is a liquid recovery apparatus 20 which recovers a liquid f, the liquid recovery apparatus 20 comprises a liquid recovery nozzle 6 having a porous plate 22, a container 23 configured to be filled with the liquid f, a recovery pipe 17 having one end and the other end, the one end being connected with the liquid recovery nozzle 6 and the other end being configured to be disposed inside the container 23, a pressure chamber 27 configured so that the liquid recovery nozzle 6 is disposed outside the pressure chamber 27 and the container 23 is disposed inside the pressure chamber 27, and a pressure regulator 30 configured to regulate an internal pressure of the pressure chamber 27.

Abstract: A refrigeration system includes a primary loop that cools a secondary loop that circulates a coolant through a refrigeration load. The secondary loop includes a suction header to receive the coolant from the load, and a discharge header to direct the coolant to the heat exchanger, and a pump to pump the coolant from the suction to the discharge header. A charging loop maintains a pressure of the coolant in the supply header within a predetermined range, and includes an inlet from the discharge header and an outlet to the suction header. A flow nozzle and a valve are located between the inlet and the outlet, and a reservoir of make-up coolant communicates with the flow nozzle. Upon a low pressure condition in the suction header, the valve opens to permit flow of coolant through the flow nozzle to draw in make-up coolant from the reservoir.

Abstract: In a liquid treating equipment to maintain a small amount of liquid to a desired liquid level with constantly supplying an additional liquid into a small capacity vessel, a storage vessel 13 to store the small amount of liquid, an injection tube 16 to inject the small amount of liquid into the storage vessel 16, liquid supplying apparatus 23–25 to supply the small amount of liquid into the storage vessel through the injection tube, a flow path 15 of which one end is joined with the storage vessel, a discharge vessel 14, joined with the storage vessel 13 via the flow path, having a larger surface area than that of the storage vessel, a discharge tube 17 of which the discharging inlet is positioned at the same level position as a desired liquid level of the small amount of liquid in the storage vessel and liquid discharging apparatus 27–29 to discharge the liquid from the discharge vessel through the discharge tube are provided.

Abstract: Apparatus is provided for controllably delivering liquid, preferably foam producing liquid, from a remote supply tank to a holding tank for replenishment of liquid in the holding tank. The apparatus utilizes a pressurized air source of a vehicle to supply the energy to move the liquid. A liquid level sensing, signaling element is adapted to automatically control the filling of the holding tank and terminating operation when the holding tank is no longer being replenished.

Abstract: A water supply system for supplying water to a building including a water tank (13) for collecting water from the roof (10) and gutters (12) of the building (11); a water level sensor means (21) for sensing the level of water in the water tank; a tank water system (22) for supplying water from the water tank (13); a water pump (23) for pumping water from the water tank (13) along the tank water system (22); a non-return valve (25) downstream of the pump in the tank water system; a pressure sensor means (26) for sensing water pressure of water within the tank water system, said pressure sensor means (26) is located downstream of the non-return valve (25); a mains water system for supplying mains water; a three port valve (35) having a first port (34) connected to the tank water system downstream from the pressure sensor means (26), a second port (37) connected to the mains water system and a third port (41) connected to the building's water reticulation system; wherein when the first (34) and third port (41) a

Abstract: Effluent-operated valves provide, in a septic system, distribution of effluent uniformly to a plurality of portions or fingers of a drain field. The installation of such valves in a tank that collects septic system effluent to be distributed to a plurality of fingers permits the uniform distribution of effluent from within the tank to a plurality of portions of a drain field, either simultaneously, or to one portion at a time in sequence.

Abstract: A water protection system apparatus for detecting and stopping a flow of water which includes a power supply, a water ionization switch, and a controlled valve assembly. The water ionization switch selectively conducts electricity when exposed to water and includes an initially dry non-conductive crystallized compound. The compound ionizes when exposed to water to form an electrolyte which conducts electricity. This switch is connected to a controlled valve assembly to stop the flow of water in response to the detection of water by the switch. Other refinements include modifications to the switch housing and condition indicators for monitoring the system and signaling water detection and shutdown operations.

Abstract: A fluid level control apparatus for selectively controlling the movement of liquid flowing out of a flotation cell is described. The fluid level control apparatus is significantly reduced in size in comparison with the flotation cell or cells to which it is connected which enables less expensive construction and reduced operating costs in terms of both the equipment and the plant as a whole. The fluid level control apparatus comprises a vessel having a valve positioned therein which includes a valve body structured with a curved surface which provides selective and finite control of fluid flowing through the vessel of the control apparatus. In one embodiment at least one of the inlet and outlet of the control apparatus exhibit a cross-sectional area taken transverse to the intended fluid flow therethrough having a substantially horizontal dimension which is greater than a substantially vertical dimension.

Abstract: A system for circulating water between a container and an external system in such a way as to maintain a desired water level in the container may include, an overflow assembly and a return assembly. The overflow and return assemblies are generally tubular structures, each of which includes a pair of concentric tubes. The overflow assembly typically includes a skimmer and a silent overflow device towards its upper portion, as well as a strainer towards its lower portion, wherein water is taken out of the container through the skimmer and/or the strainer. The return assembly typically comprises an upper capped diffuser and a lower diffuser, wherein the former allows for water to exit into an tipper portion of the container and the latter provides for water inflow at a lower portion of the container. Both assemblies are installed inside the container by attaching to a lower wall of the container.

Abstract: An accumulator for collecting a volume of a liquid, which includes controls to permit the liquid to rise in a container to a preset upper level, at which level a drain valve is opened causing liquid to flow out of the accumulator. The accumulator utilizes two opened bottom pipes, which are connected through check valves to a controller. The controller is sensitive to the pressure at its inlet port. The pipes are interconnected so that when the liquid reaches an upper level, the pressure at the controller is sufficient to open the drain valve, and once the accumulator is almost empty, the drain valve is closed.

Abstract: A control system for maintaining the liquid levels in a plurality of reservoirs connected in series includes one or more nested control modules. The nested control module, one for each reservoir, includes a proportional only level controller in electrical communication with the respective level sensor of each respective reservoir and is adapted to produce an output that becomes a set point for one or more respective PID flow controllers adapted to control the respective outflows of said respective reservoirs. The control system results in maintaining liquid levels in the reservoirs while substantially eliminating flow and level oscillations.