Abstract: A multiple fuel tank arrangement for maximizing fuel delivery to a vehicle during off level operation. The system has a tank from which fuel is withdrawn and at least one additional tank located at approximately the same level. The tanks are connected by a transfer line and crossover line. The transfer line connects the bottom of the tanks and only allows fuel flow into the fuel withdrawal tank. Openings for the crossover line are positioned such that a large volume of fuel is trapped in the fuel withdrawal tank when the tanks are as different relative elevations during off level operation.

Abstract: A main storage tank (2) is pressurized by engine bleed air. A supply tank (12) communicates with tank (2) and with an engine feed line (50). A fluid impermeable expandable wall (34) separates tank (12) into isolator chamber (38) and pressure chamber (40). A surface tension screen (44) covers inlet (42) into isolator chamber (38) to allow liquid fuel to enter chamber (38) and prevent gas from entering chamber (38). During operation of the flight vehicle, a fuel pump withdraws fuel from chamber (38). Pressure chamber (40) is vented to ambient air when the flight vehicle is under no power or is operating under g forces greater than zero, to allow wall (34) to expand and contract to compensate for changes in temperature and pressure. Chamber (40) is pressurized by engine bleed air when the vehicle is operating under zero or negative g forces.

Abstract: A subsea system for the storage of petroleum products or other liquids with densities lighter than water is disclosed. The system includes at least one storage tank disposed alongside a bowl-like structure. A flexible membrane sealed to a top peripheral surface of the bowl structure or a hollow bladder supported by the bowl is provided. Pipes run from the bottom of the tank to the space between the membrane and the bowl or to the interior of the bladder. Water stored in the tank is displaced to the bowl/membrane volume space or to the hollow bladder. When discharge of the petroleum products is desired, a supply/discharge valve at the top of the tank is opened and sea pressure acting on the flexible membrane forces water from the membrane/bowl space or bladder back into the bottom of the tank causing the petroleum products to be discharged via the supply/discharge pipe.

Abstract: A water storage reservoir, prevailingly underground, comprising a first reservoir provided above the ground level and connected to water feeding and distribution means, an underground tank which is also connected to said water feeding means, a second reservoir provided inside said tank and on its bottom, and connected to said tank through opening means, the pressure of the water columns in series in the first reservoir and in the tank being always lower than the water feeding pressure.

Abstract: An electroplating solution recovery system is disclosed which includes an electroplating tank containing an electroplating solution and one or more rinse tanks containing rinse solutions. A tubular interconnection extends between a first of the rinse tanks and the electroplating tank and is operative for transferring rinse solution from the first rinse tank to the electroplating tank by a siphoning process when the level in the plating tank is significantly lower than the level in the rinse tank. Additional tubular interconnections extend between the other rinse tanks for interconnecting them in series relation so that the solution in the tanks is automatically replenished as it is consumed, the solution level in the last tank in the series, however, being replenished from a continuous water supply. Maximum recovery of plating solution is assured by the system, and the pollution levels in the overflow effluent from the last rinse tank are minimized.

Abstract: The partial vacuum produced at the inlet passage of a vortex chamber is employed to move liquid from one compartment to another in order to maintain the level of liquid in at least one of the compartments within a predetermined level of the liquid in the other compartment. In one embodiment, the vortex unit or other suction means develops a partial vacuum at the maximum height of a siphon tube extending between the two chambers, the vacuum drawing fluid from both or at least one of the chambers to the top of the tube thus initiating siphoning. A sump pump having a negative pressure insufficient to lift the liquid to the maximum height of the siphon tube is employed to deliver liquid to a load and concurrently to the vortex unit to establish the required partial vacuum to initiate siphoning.

Abstract: Apparatus for automatically purging the primary reservoir in an evaporative cooler which utilizes a secondary reservoir supplied with a portion of the output flow of the recirculating pump. The primary and secondary reservoirs each contain drain valves actuated when the fluid level therein exceeds a predetermined level. The normal operating fluid level in the primary reservoir is established below the drain level. When the secondary reservoir is filled and drains, its flow is directed into the primary reservoir causing it to exceed its fluid drain level and thus automatically purge the primary reservoir of fluid.

Abstract: A reserve tank is built into the vehicle, and communicates with a filler pipe. A sleeve extends into the reserve tank, the upper end of which defines the reserve capacity, and the other end of which is connected with the inlet of the fuel tank. The contents of the reserve tank can be transferred readily into the fuel tank via a bypass with a valve. An expansion tank with a volume of at least 10% of the tank volume, is likewise connected with the fuel tank via a pipe. An air vent connection of the fuel tank and an air vent connection of the expansion tank are alternately connected with the atmosphere via valves controlled by a closure device, in such a way that, when the filler is open, the air vent connection of the fuel tank is opened, while the air vent connection for the expansion tank is shut. A non-return valve is incorporated in the passage which leads from the connection on the fuel tank via the expansion tank into the air vent connection for the expansion tank.

Abstract: A vehicle fuel tank has a filter and a secondary reservoir disposed above the filter. An intank fuel pump is situated within the secondary reservoir and draws fuel from the interior of the filter. An inertia responsive valve controls fuel communication between the secondary reservoir and the interior of the filter. The valve opens when the vehicle undergoes acceleration to allow fuel in the secondary reservoir to enter the filter interior. The secondary reservoir is filled by a fuel return line from the vehicle engine.

Abstract: A water well pumping system for controlling the volume of fluid supplied to a supply reservoir from a primary reservoir and drawn off through an outlet conduit to the volume of fluid produced and pumped from the well. A fixed or variable resistance is interposed in piping between the primary and supply reservoir.

Abstract: A device for a fuel tank for a car with a main fuel tank, comprising a filling tube, a ventilation box, and a piping system leading from the filling tube to the main tank. A reserve tank permanently built into the car is located within the piping system. The reserve tank has an upper wall and a wall with an opening therein. The reserve tank communicates with the filling tube. A pipe protrudes into the reserve tank and has at one end an upwardly open rim, whereby the height of the upper rim determines the volume of gasoline reserve inside the reserve tank. The pipe travels via the opening through the wall of the reserve tank, and forms at its other end the inlet to the main tank. The ventilation box is located at a point above the upper wall of the reserve tank. A by-pass hose by-passes the opening, and has an upper end which leads into a wall area of the reserve tank, and a lower end which leads to a point downstream of the opening.

Abstract: Portable liquid measuring and dispensing device comprising a main reservoir for containing oil and to which a chamber is connected for metering a predetermined quantity of oil, this chamber being solid with the main reservoir and having a visual indicator showing the quantity of liquid contained in the chamber. The device includes a liquid moving assembly solid with the reservoir and the chamber, this assembly being formed of a rotary pump brought into rotation by a D.C. motor connected to a power source including a polarity inverter switch having a pair of buttons, each actuatable to cause rotation of the pump in one of its two directions of rotation.

Abstract: Method and apparatus for high speed vacuum pumping of an air lock. A vacuum pumped expansion tank having a volume larger than the volume of the air lock is coupled through a valve to the air lock. When evacuation of the air lock is desired, the valve is opened for a brief duration and the gas in the air lock rapidly expands into the expansion tank. Multiple pumping stages, each including a vacuum pumped expansion tank coupled through a valve to the air lock, can be utilized to decrease the final pressure in the air lock. The valves are sequentially opened to permit sequential expansion of the gas in the air lock into the expansion tanks. Multiple air locks can time share the same pumping system.

Abstract: An auxiliary float chamber is provided for use in a cistern. A float operating in the chamber controls a valve allowing water into the cistern. In the floor of the chamber there is a syphonic tube. The chamber is held to the cistern wall by means of the valve which is of the type comprising a sliding tube sealing against a washer in a sealing cap so that the seal is not against the pressure of the inlet water. The auxiliary float chamber is mounted below the normal level of liquid in the cistern. As the cistern is discharged, the valve remains closed until water has drained from the auxiliary chamber. Water flowing into the cistern is thus not short-circuited through the discharge.

Abstract: The transportation of oil and gas under high pressure in tanks on board a ship is carried out by loading and unloading the oil/gas utilizing a suitable pressurized liquid, for example water, in the individual tanks, whereby during loading, a tank or a group of tanks containing pressurized liquid are filled with oil and gas while the pressurized liquid simultaneously is displaced into the next tank or group of tanks which are to be filled, after which the said next tank/group of tanks are filled and the pressurized liquid displaced into a third tank/group of tanks, etc., and that during unloading, the cargo in one tank or one group of tanks is removed by introducing a pressurized liquid into the tank/group of tanks, and unloading of the cargo in the next tank/group of tanks occurs by transferring the pressurized liquid from the said first tank/group of tanks to the next.

Abstract: A safety air gap system for an exemplary high volume evacuator having a water-sealed pump to provide suction thereto and including a gray water discharge from the pump to a drain, the system including a closed housing adapted to be mounted at a higher level than the evacuator, a reservoir for fresh water in the housing terminating a predetermined distance below the top, a coaxial pair of inner and outer tubes extending upward from the bottom of the reservoir and terminating above the top of the reservoir, the lower end of the inner tube receiving municipal water for discharge at the top to the outer tube which discharges the water at the lower end to the reservoir as controlled by a float-operated valve between the upper ends of the tubes, the housing having in one sidewall an outlet port connectable to a drain at a level below the top of the reservoir to prevent accidental filling of the housing with water in the event of a malfunction of the system, and an air gap opening positioned in a sidewall of the hou

Abstract: A sensor utilizes the opposition of a fluid to physical displacement to provide information about the fluid itself, such as its quality as measured by its density or viscosity, or about the state of a fluid system which contains it, such as the fluid pressure existing at some point in the system. The sensor includes a fluid displacement device or element physically adapted to displace the fluid and repetitively urged into displacement by the application of a known impetus or urging force. The resulting motion of the element is then analyzed to obtain the information desired. The fluid displacement element may additionally perform a pumping function, or it may operate in a fluid stream externally powered. When employed as a pump, the sensor may provide information on the fluid pumped or on the state of the fluid system.

Abstract: A device in a fuel tank for motor vehicles which, if the fuel level is low when driving on an inclined surface, retains a required amount of fuel around the fuel line opening to prevent air intake. Around a container on the tank bottom, into which the fuel line opens, is a larger container, and the two containers have inlets for fuel from the surrounding tank. One container has the inlet in its front side wall and the other container in its rear side wall, as viewed in the longitudinal direction of the vehicle.

Abstract: A tractor trailer, the trailer being a cylindrical tank for transporting liquid material having a set of supporting wheels about one-quarter of its length from its rear wall. On level ground, the tank is inclined downwardly forwardly at an angle of about 3.5.degree. and has a framework extending from its front wall about midway of its height, a drawpin depending from the front of the frame for connection to the tractor being intersected by an extension of the tank's longitudinal center line. The frame supports a pressure-vacuum pump connected through a conduit to a dome at the rear of the tank for exerting pressure or creating a vacuum within the tank's interior. The tank has a central vertical baffle, extending its length and having openings at the top and bottom, and two transverse baffles which divide the tank into three parts of about equal volume also having openings at the top and the bottom. Pipes extend outboard from the tank's forward bottom which have ports.

Abstract: An indicator/controller for dispensing medical fluids (e.g., intravenously) is disclosed. The device has vented chambers that are movable vertically with respect to one another, thin-plate orifices, capillary chambers, and membrane valves, in addition to other features. The device need be set only once to the desired flow and it will maintain that flow rate regardless of changes in temperature or the height of fluid in the supply.

Abstract: A vestibular tank is connected in series with a main fuel tank and provided with an inlet and a rimmed outlet so spaced as to inhibit passage of a siphon tube through the inlet and over the rim of the outlet. The outlet's rim also functions to retain a predetermined quantity of fuel in the vestibular tank which may be readily siphoned off and thus induce a belief that all the fuel remaining in the tanks has been removed.

Abstract: A valve includes housing and body members that have cylindrical valve surfaces. The valve body being centered in the housing by an array of at least three resilient support elements circumferentially spaced about the valve body. The valve body includes a plurality of ports arranged for selective alignment with housing ports as the valve body member is rotated and a through passage that connects two of the valve body ports. The resilient support members are apertured and conform in sealing engagement between the juxtaposed cylindrical valve surfaces so that they also function as annular valve seal members.

Abstract: A flow control device adapted for use with a vertically aligned array of storage battery formation tubs, for controlling the fluid level within a formation tub, the flow device comprising a hollow cylindrical member capable of extending vertically between the drain of the formation tub in which the fluid level is to be controlled, and a second formation tub placed thereon; a first sleeve concentric with and slidingly engaging the upper portions of the cylindrical member and adapted to engage the drain of the upper formation tub; and a second sleeve concentric with and slidingly engaging the lower portions of the cylindrical member; wherein the second sleeve includes a first slot extending through the sleeve and to its lower most edge, and is capable of variably engaging second slots extending through the central portions of the cylindrical member to permit adjustment of the fluid level in the formation tub.

Abstract: A fuel tank arrangement for a tractor which stores its fuel in an auxiliary tank and a main tank that are spaced apart in the tractor. The tractor's engine receives its supply of fuel from a fuel pump after it has passed through a primary fuel filter. The fuel tank arrangement incorporates a first line fluidly connecting the main tank to the fuel pump. The arrangement also utilizes a main vent to connect the forwardmost portion of the upper section of the main tank to the atmosphere, and an auxiliary vent to connect the rearwardmost portion of the upper section of the auxiliary tank to the atmosphere. The next element of the arrangement is a supply system which requires all of the fuel to pass through the main tank to reach the fuel pump. The supply system fluidly connects the bottom section of the auxiliary tank with the forwardmost portion of the top section of the main tank through a second line.

Abstract: PCT No. PCT/SE78/00065 Sec. 371 Date June 28, 1979 Sec. 102(e) Date June 25, 1979 PCT Filed Oct. 26, 1978 PCT Pub. No. WO79/00241 PCT Pub. Date May 3, 1979A fluid tank arrangement of the kind adapted to deliver a fluid to a consumption unit and comprising a reserve fluid container (16), which is operable to deliver the reserve fluid into the tank (3) when the fluid in the tank has been consumed, said container being arranged in association with a filling hole (4) in the tank. According to the invention, it is proposed that said container is combined with a cap (1) for the filling hole in the tank so as to compulsorily follow the cap when it is removed from and replaced onto the tank and that the container, when containing said reserve fluid, is adapted to retain the reserve fluid independently of the position of the cap and tank. The container is preferably an absorption element.

Abstract: Apparatus for submerged grinding of ferrous and non-ferrous metals comprising a work tank adapted to contain a liquid, and means for supporting a workpiece in the work tank. The level of liquid in the tank can be raised to cover the work for grinding or lowered to expose the work for inspection. Changing the liquid level is accomplished by a ballast tank connected to the work tank, and a liquid displacement member in the ballast tank. Raising the displacement member lowers the liquid level in both tanks, and lowering it raises the liquid level in both tanks.

Abstract: A method and apparatus is provided whereby a pressurized long vertical shaft bioreactor is protected against extreme surges of influent waste liquid. The method provides for the transfer of excess waste from the top of the bioreactor head tank to an adjacent collection vessel where, in response to the pressure created in the bioreactor, the collected waste is caused to overflow and is returned to the influent waste stream. The method permits the return of waste from the reactor to the influent stream while bypassing the normal circulation route through the reactor. Simplification of control is provided and float or level control valves may be eliminated thereby reducing construction, operating and maintenance costs.

Abstract: A simple device for automatically filling a plurality of open containers, such as bottles, to permit a plurality of such containers to be sequentially filled, when connected to a constant source of liquid, without possibility of running over. A common header receiving the liquid has a plurality of depending traps, each connected thereto with an inlet tube which is shorter than the distance the traps outlet tube extends into the container, whereby the entrance of the liquid is automatically cut off when the liquid level in the container rises sufficiently to cover the lower end of the outlet tube and the hydrostatic pressure thereat equals that of the inlet tube.

Abstract: An improved battery formation apparatus wherein a specially designed overflow/drain plug is provided for directing the flow of fluid out of a water tub used to control the temperature of batteries during the formation thereof. The plug is a combination of a hollow plug member and a collar member fitted around this plug member. The plug member is designed to fit inside the drain opening and extend upward therefrom to control the liquid level in the container, and furthermore, the plug is designed to fit around the bottom of the drain opening to facilitate draining of the fluid from the opening. The plug member has an elongated slot therethrough, and the collar means is slidably fitted around the plug member to adjustably determine the height along the plug member which the fluid must reach before it is drained through the elongated slot.

Abstract: A liquid transport container unit carried by a vehicle for transporting liquid products such as water or gasoline is disclosed, such unit utilizing an elongated base section positioned parallel to the direction of movement of the vehicle. This base section contains an internal chamber for containing the liquid to be transported. An elongated upper section positioned substantially parallel to the base section is also mounted to the vehicle. This upper section is elevated with respect to the base section and also has an internal chamber for receiving the liquid. A plurality of return portions are connected between the base section and the upper section and are adapted for communicating the liquid between the internal chambers of the upper and base sections.

Abstract: The invention relates to an apparatus for the continuous preparation of photographic emulsions by a continuous flow process, in which a volume stream entering a pipe system flows successively through the various sections of this system corresponding to the individual stages of the process, such as the inlet points for introduction of the volume streams, mixing paths and ripening paths.

Abstract: An edible high-protein flour is produced by an improved process. Cottonseed meats are dried, and then comminuted in a combination of mills having certain specifications which prevent rupturing the pigment glands of the cottonseed. Recycling of partially ground meats is practiced. This improvement is correlated with liquid cyclone separation followed by oil and solids recovery steps, thus comprising an improved process which consistently yields an edible cottonseed protein concentrate and high grade cottonseed oil. An apparatus is disclosed for interconnecting tanks in an in-line liquid process for the purpose of minimizing spills and directing overflow from the tanks at the end of the process to the tanks at the beginning of the process. This apparatus includes a number of processing tanks located in proximity to one another. Overflow conduits are provided to sequentially connect one process tank to the other from the first tank to the last tank of the process.

Abstract: Fluid is withdrawn from plural fluid-filled tanks via respective outflow conduits leading into a common mixing conduit which includes a mixing pump, and then branches off through respective inflow conduits for return of intermixed fluid back to the individual tanks. Each inflow conduit is provided with a valve unit comprising a vessel-like housing having an inlet port and an outlet port. The flow from the inlet port to the outlet port is regulated in dependence upon the height of fluid in the respective tank. The fluid height is sensed indirectly by sensing the height or pressure of fluid in the interior of the vessel-like housing, the latter being at least partly lower than the height of fluid in the respective tank. Thus, the return of fluid into each tank is regulated to maintain a respective fluid height therein independently of the other tanks.

Abstract: The interelectrode gap of an ionography imaging chamber is connected with a variable-volume container which is filled with a high Z gas at atmospheric pressure, and with first and second accumulators which respectively contain high Z gas at a higher and lower superatmospheric pressure. A timer circuit actuates valves in the conduits between the chamber on the one hand and the container and accumulators on the other hand in a given sequence so that, when the pressure of high Z gas in the gap is to be raised to an operating pressure which exceeds the aforementioned higher pressure, the circuit opens a first valve which allows gas to flow from the second accumulator into the chamber and thereafter a second valve which allows gas to flow from the first accumulator into the chamber. The circuit thereupon starts a pump which conveys gas from the container into the chamber whereby the volume of the container decreases. The pumping step is terminated when the pressure in the gap reaches the operating pressure.

Abstract: Draining apparatus is provided for a fluid reservoir having an opening. The apparatus includes a guide housing connected about the reservoir opening and a fluid carrier conduit slidably positioned within the guide housing. The fluid carrier conduit is movable relative to the guide housing from a first nesting position to a second extended position for draining the fluid reservoir.

Abstract: A compact fluid pressure regulation valve includes a valve body, the valve ody having a pair of passageways, one passageway being a fluid pressure regulating passageway and the other passageway being a high pressure fluid supplying passageway. The fluid supplying passageway extends substantially perpendicular to the pressure regulating passageway and has a downstream end which opens to an upstream portion of the pressure regulating passageway. The fluid supplying passageway has on and off modes for supplying high pressure fluid to the pressure regulating passageway. A device is provided for activating the fluid supplying passageway from an off mode to an on mode. Further, a device is provided within the pressure regulating passageway for utilizing pressure within this passageway as a back pressure to regulate the pressure of the fluid flowing therethrough. With this arrangement a very compact fluid pressure regulation valve is provided.

Abstract: System for controlling flow rate in pipelines connecting a plurality of reservoirs is disclosed. Flow rate Q.sub.ij (t) of fluid flowing from one reservoir (i) to another reservoir (j) is first calculated from the water levels H.sub.i (t), H.sub.j (t) of both reservoirs (i), (j) and then water level H.sub.j (t+1) of the reservoir (j) at the time (t+1) is calculated from its inflow and outflow taking into account the predicted amount of demand Q.sub.je (t).If the water level h.sub.j (t+1) is below or over the predetermined lower or upper limitation, manipulated variables for valves and pumps installed in pipelines are regulated to control inflow of the reservoir (j) so that the required fluid-feed is satisfied while maintaining the scheduled water level of the reservoir (j).

Abstract: A separate reservoir of fuel having sufficient capacity to operate a vehicle for approximately ten minutes is inserted in the line between the fuel pump and the carburetor. A normally opened remote controlled valve is inserted between the reservoir and the fuel pump and which is independently operable by the vehicle owner. A vent is located in the uppermost portion of the reservoir and consists of a float type check valve that is closed by the rising level of fluid urged into the reservoir from the fuel pump. Leaving the valve open allows the vehicle to operate in the normal fashion. The operator closes the normally opened remotely located valve when leaving the vehicle or giving the vehicle to a parking attendant who has limited authority to only park and service the vehicle. Unauthorized use of the vehicle converts the pressurized fuel system into a gravity fuel system with the limited fuel flowing from the reservoir into the engine carburetor until the fuel is exhausted, thereby stalling the engine.

Abstract: Treating and venting gaseous nuclides in the gas space above the liquid level in tanks containing radioactive liquid is accomplished by connecting the gas spaces in series with the gas space at one end having the highest radioactivity, normally discharging at a limited rate into a waste gas system, and air to replace the discharged gas, introduced into the gas space at the other end. Sudden surges or fluctuations in gas pressure in the gas spaces due to rapid filling of the tank with liquid is relieved by discharging gas from the gas space of low activity at the other end into a stack. Voids in the tanks created by rapid emptying of the tanks is filled by air entering the gas space of low activity at the other end. A self cleaning filter which removes nuclides from the gas before entering the stack is reactivated by the passage of air in a reverse direction through the filter with the return of the nuclides to the gas space of low activity.

Abstract: Chemical distribution system having a pressurized tank for causing flow of chemical to a plurality of appliances and having an apparatus for introducing a chemical into the tank from bulk storage and maintaining the pressure at a constant, predetermined value.

Abstract: A recycle system for polymerization of monomers to produce polymers of wide-molecular weight distribution comprising two reactors and two conduit lines disposed between said two reactors for forming a cyclic path, and means disposed in said lines for conveying the contents of one of said reactors to the other without affecting the polymerization conditions in each of said reactors which conditions may be different.

Abstract: An overflow unit for a water heater installation has a plastic, resilient polystyrene pan with a bottom wall for receiving the bottom of the heater and a continuous side wall including inner and outer walls which diverge downwardly in a range of approximately five to fifteen degrees. A bottom edge portion of the outer wall is substantially coplanar with the bottom or outer face of the bottom wall but, preferably, extends outwardly a distance up to approximately 0.0001 inch from the outer face of the bottom wall when the pan is in a relaxed condition. Upon being placed on a supporting surface and receiving the water heater, the bottom edge portion of the outer wall is snugly and closely seated on the supporting surface. A drain coupling for receiving a drain line opens through the inner and outer walls and is in sealed engagement with the inner wall.

Abstract: A reservoir tank has filling and outlet ports which are provided in a common aperture formed through the tank top.

Abstract: A method for use in surface treatment systems for maintaining a desired fluid level in the process and rinse tanks. The invention uses a dryrunning-safe pump, inserted in the tank. An overflow for the tank serves as an intake leading to the suction side of this pump. The pressure side of the pump is connected to an outlet outside the tank.

Abstract: Apparatus for the staged, controlled dilution of a sample comprised of a particulate solids containing fluid with a preselected amount of a fluid diluent. The apparatus consists of a plurality of vessels connected together in series such that diluent introduced into the first vessel flows consecutively from vessel to vessel, to exit from the last vessel of the series. The raw sample of particulate solids is introduced into the last vessel of the series, diluted, and progressively diluted specimens of the original sample are transferred from vessel to vessel countercurrent to the flow of diluent. The sample, diluted with a preselected quantity of diluent in the several stages of dilution, is finally removed from the first vessel of the series, suitable for analysis, e.g., via the use of electronic counters.

Abstract: Liquid effluent from a sewage treatment plant is injected into a disposal well by gravity feed, and alternatively by pressurized feed when the effluent load becomes too great for the gravity feed to handle, or when the gravity feed is slowed by the presence of solids in the effluent. The disposal well is reverse purged when necessary to remove obstructing solids.

Abstract: A storage container is disclosed as well as a liquid storage system. Each container has walls of thin plastic material with the top and one sidewall of each container including a plurality of protuberances and the bottom and other sidewall including a plurality of indentations complementary to the protuberances so that, when like storage containers are brought into adjacent relationship, protuberances in one wall of one container are received in and mate with the indentations in one wall of the other container to facilitate maintaining vertical stacking and/or abutting side-by-side relationship of the system. The protuberances and indentations preferably have complementary slanting walls and each container wall preferably includes three such protuberances or indentations which are of substantial dimensions to also strengthen said walls.

Abstract: Metal in the molten state is transferred from one treating stage or zone to a succeeding stage or zone by gravity flow, the flow from one zone to the next being controlled by gas pressure, thus eliminating the need for valves, gates or similar moving parts. The process is particularly adapted to the treating of ferrous metal, more particularly to the making of steel. By providing sufficient zones in the series a continuous process can be run, starting with feed from a blast furnace, and conducting the material through alloying stages and a degassing stage and into a continuous casting zone.

Abstract: A hydraulic circuit comprises a first tank elevated above a second tank and openly communicating therewith by a conduit adapted to continuously maintain the second tank at full capacity with a hydraulic fluid. The hydraulic fluid is pumped out of the second tank and to a work system wherefrom it is recircuited back through a filtering system, retained in the first tank. Upon malfunctioning of the filtering system to prevent the egress of hydraulic fluid therethrough, the increased pressure level of the recircuited hydraulic fluid will function to open a directional control check valve in the second tank to by-pass the conduit normally communicating hydraulic fluid from the first tank to the second tank.

Abstract: A blood analysis system comprises a plurality of flow through measuring chambers, each of which has an associated measuring electrode system for producing an output signal as a function of a parameter of the blood sample in its measuring chamber; and a control device which in a first condition places the measuring chambers in fluid communication with the system inlet and in a second condition isolates the chambers to that the electrode systems may be calibrated concurrently and independently of one another