Abstract: A method and a device for recycling compressed gas where the compressed gas used in a compressed gas consumer, particularly a container blow-molding machine, is fed back into a compressed gas generator. In order to increase the recycling volume, the compressed gas from the compressed gas consumer is collected separately and fed back to at least a first and a second pressure range of the pressure generator separately according to pressure stages.

Abstract: A top for a table, desk, counter or the like includes a watertight tank with a clear top surface. A mirror or other surface having dimensions less than the outer dimensions of the tank is positioned in the tank below the top. The tank is filled with a liquid to a level below the mirror such that air remains in the space between the top surface and the surface to the mirror. A pump discharges the liquid through tubes positioned around the perimeter of the tank in the space between the top surface and the surface of the mirror, causing bubbles to form and circulate in the space.

Abstract: A dispensing apparatus for dispensing predetermined volumes of fluid into receptacles receives the fluid to be dispensed from a fluid supply into a reservoir. A fill tube is connected to the fluid reservoir such that it forms a closed loop with the reservoir. The fill tube minimizes the fluid turbulence that occurs inside the reservoir while the reservoir is being re-supplied with fluid from the fluid source. Additionally, the fill tube holds the predetermined volume of fluid to be dispensed into the receptacle. A fluid level sensor is disposed along the fill tube to control the volume of fluid flowing into or out of the fill tube, while a timer controls a dispense valve to meter the flow of fluid into or out of a dispense tube.

Abstract: The present invention provides a liquid replenishing device comprising a liquid storage tank, a chemical liquid supply pipeline, an ultrapure water supply pipeline, an ultrapure water quantitative supplement pipeline and a circulating pipeline. The chemical liquid supply pipeline supplies chemical liquids to the liquid storage tank. The ultrapure water supply pipeline supplies ultrapure water to the liquid storage tank. The ultrapure water quantitative supplement pipeline quantitatively replenishes ultrapure water to the liquid storage tank. One end of the circulating pipeline is connected with the outlet of the liquid storage tank, the other end of the circulating pipeline is connected with the inlet of the liquid storage tank.

Abstract: A method of removing slag formed during laser cutting a hypotube may include flowing cooling gas into a laser nozzle, directing flow of the cooling gas onto an external surface of the hypotube, and injecting cooling fluid into an inner lumen of the hypotube at a velocity. Flowing the cooling gas and injecting the cooling fluid may at least partially remove slag from the external surface of the hypotube.

Abstract: A gas recycling system for a controlled atmosphere furnace includes a controlled atmosphere furnace having a product entry, a product exit, a process gas inlet adjacent said product exit, and a spent gas outlet adjacent said product entry. A spent gas recycler is operationally connected to the spent gas outlet. The recycler produces a recycled process gas stream and a waste gas stream. The recycled process gas stream is returned to the controlled atmosphere furnace. The waste gas stream is returned to the controlled atmosphere furnace at a point downstream from the spent gas outlet.

Abstract: A method for detecting a leak in a closed-volume liquid system comprises circulating a fluid through a closed-loop with a pump having a reservoir and that is driven by an electric motor. The method also comprises sensing a pressure in the closed-loop, sensing current draw by the motor and sensing fluid level in the reservoir. The method further comprises determining a presence of a leak of fluid from the closed-loop based upon two of the sensed signals using a first leak detection logic, and determining the presence of a leak of fluid from the closed-loop based upon at least one of the sensed signals using a second leak detection logic.

Abstract: High-throughput OVJP systems and methods are provided that may use multiple flow paths having different conductances to enable deposition with relatively short lag times. A high-throughput OVJP system may include a flow tube having a cross-sectional area much larger than the diameter of one or more apertures through which source material may be expelled during deposition. Use of such a configuration may allow for deposition with reduced lag times.

Abstract: An article of laboratory glassware for directing the flow of chemical materials is described. The article includes a glass manifold having a plurality of input ports and at least one output port, and a plurality of stopcocks. Each stopcock has an inlet port and an outlet port connected by a passageway through the plug. Each of the stopcock output ports is connected to one of the manifold input ports, and each of the stopcock input ports is connected with one end of a hollow glass tube, and the other end of the hollow glass tube is connected to a female ground glass joint. The output ports of the manifold are terminated to a male ground glass joint. Each plug is rotated by an electrical motor or a servo, and sensed by a sensor. The rotation of each rotating plug is controlled by a computer.

Abstract: Provided is a fluid device unit structure in which a chemical solution stagnation portion that is formed between a valve of a main fluid flow path and a branching point of a return flow path is minimized to cause hardly any solidification of a chemical solution. In the fluid device unit structure in which a plurality of fluid devices that are connected via flow paths are integrated on a base member (10) to form a single unit, and the main fluid flow path (11) and the return flow path (12) formed in the base member (10) are respectively provided with a first valve (20) and a second valve (40) for switching the flow paths, the branching inlet (12a) at which the return flow path (12) branches from the main fluid flow path (11) is close to the upstream side of the first valve (20).

Abstract: A nuclear plant is provided with a pipe-passivating alkali-injecting device including an alkali-injecting tank, an actuator, a counter-balance valve, a pressure gauge, exhaust valves and switching valves. The actuator is connected to the alkali-injecting tank via a first pipe. The counter-balance valve is connected to the actuator via a second pipe and connected to the alkali-injecting tank via a third pipe. The pressure gauge is provided between the actuator and the counter-balance valve and connected to the second pipe. The exhaust valves are connected to the first and second pipes, and so are the switching valves. The alkali-injecting tank, the actuator and the counter-balance valve are used together to expel gases from the pipes while injecting alkali, thus effectively avoiding feedback of liquid in the nuclear plant, transmitting pure alkali in the pipes, and reducing damage to the pipes.

Abstract: A water circulating system is for distributing instant hot water at a fixture that has respective hot and cold water inlets. The system includes hot and cold water piping, a pump constructed and arranged to pump water through said hot water piping. A by-pass device is provided at the sink area and connected directly between the hot water inlet and the cold water inlet. The by-pass device includes a pump for drawing hot water, a thermal switch, and a check valve. The pump, thermal switch, and check valve are constructed and arranged in series. A controller is connected to the pump so as to control the duty cycle of the pump so as to establish at least one of a selectable pump cycle time, and a selectable pump running time.

Abstract: A water recirculation system for a shower unit comprises a plurality of reservoirs and switching means for selecting from which of the reservoirs the shower unit receives water. A pump recirculates water from a waste trap of the shower unit to the active reservoir. Each reservoir contains a heater. At the user's command, a system of valves is reconfigured so that the shower unit becomes supplied with fresh water circulated from a second reservoir. Meanwhile, the first reservoir is emptied, refilled and reheated to be ready for further use if required. Further pipes may be provided to allow preheating and circulation of the water in the system prior to use of the shower unit; and to allow the system to be flushed with water from a mains supply.

Abstract: A hydraulic flow sensing apparatus is provided. The apparatus includes: a manifold; a hole in the manifold in fluid communication with a fluid pathway; a poppet valve in the hole in the manifold configured to move when fluid in the pathway flows; and a proximity switch configured to detect movement of the poppet valve. A method of operating a hydraulic circuit may also be provided.

Abstract: Process for transferring a liquid from a passive tank (1) for storing the liquid to an active tank (2) using a pump intended for pumping the liquid held in the passive tank (1) and transferring it to the active tank (2), according to which the pump is commanded so as to transfer liquid from the passive tank (1) to the active tank (2) when said active tank (2) has a liquid level below a set point level Lsp and when the passive tank (1) contains liquid at a temperature above the freezing point of the liquid.

Abstract: A commercial hot water system includes a hot water source, and a hot water delivery line connected between the hot water source and at least one plumbing fixture. A pump, enables circulation of hot water to and from the fixtures. A controller provides for turning on the pump in conjunction with an external signal, and a detector, preferably a temperature sensor, in conjunction with the controller, is effective in stopping the pump to prevent heated water from being circulated.

Abstract: A water delivery system is provided, comprising at least one faucet device with a cold water faucet part and a hot water faucet part, a cold water line to the at least one faucet device, a tankless heater device for heating water, a hot water line having a first portion running from an outlet of the tankless heater device to the at least one faucet device and having a second portion running from the at least one faucet device to an inlet of the tankless heater device, and a circulatory pump arranged in the second portion of the hot water line, wherein the circulatory pump has a prefixed first performance level and a prefixed second performance level, wherein the first performance level causes a finite water flow in the hot water line which is below an operation threshold value of the tankless heater device.

Abstract: Systems and processes are disclosed for forming a thin film photovoltaic device. A process includes heating a thin film photovoltaic sub-device to an anneal temperature. The thin film photovoltaic sub-device includes a glass substrate and a transparent conductive oxide deposited on the glass substrate. The process further includes quenching the thin film photovoltaic sub-device with a quenching gas to cool the thin film photovoltaic sub-device to a quenched temperature. The quenching gas includes an inert gas.

Abstract: Method for carrying out a bleed and feed of process solutions in a process tank. The feed solution is pumped out of a first tank into a first receiving space. The first receiving space is subsequently emptied into the process tank of with a pump. The volume of delivered feed solution in the process tank is measured. The bleed solution is pumped from the process tank with a pump into a second receiving space. The volume of delivered bleed solution in the second receiving space is measured. The bleed solution in the second receiving space is subsequently emptied into the second tank. The first receiving space differs from the second receiving space. A correction factor is calculated by comparing the measured and calculated volumes of the bleed and feed solution delivered by the pumps, with which correction factor the nominal delivery volume of the pumps are corrected in the next cycle.

Abstract: A fluid cartridge, comprising a channel layer within which at least one circumferentially sealed fluid channel is formed, the channel layer comprising a substrate and an elastic layer fixedly arranged on the substrate, wherein the substrate has a rigidity being greater than that of the elastic layer, and wherein the at least one fluid channel is defined on at least one side thereof by the elastic layer.

Abstract: A closed-loop system includes a pump driving a fluid through a series of conduits. A control system is included that minimizes pressure fluctuations in a bootstrap reservoir to maintain a desired minimum pressure at the pump inlet. Moreover, the control system reduces a maximum system pressure by reducing the magnitude of pressure fluctuations encountered by the bootstrap reservoir.

Abstract: A pressure washer device is provided that employs an unloader bypass valve that directs a selective amount of fluid via a small diameter bypass line back to a water storage tank. The small amount of fluid allows for the pump to remain working and introduces cooler water into a bypass circuit, thereby allowing the thermal relief valve to be omitted. The diameter of the bypass line is of such a diameter to prevent siphonage of the detergent associated with the pressure washer system into the water storage tank as well.

Abstract: The present embodiments relate to ballast systems for marine structures. The ballast system comprises a ballast tank and a pump. The pump comprises a low side and a high side and the ballast system comprises a first inlet conduit assembly adapted to provide a fluid communication between the ballast tank and the low side. The ballast system is adapted to provide a first operating condition in which first operating condition a fluid is pumped from the low side to the high side.

Abstract: Systems and methods are provided for preventing oil migration in an engine lubrication system. The system includes a gearbox, a shaft disposed at least partially in the gearbox, an oil reservoir in flow communication with the gearbox, an oil supply pump in flow communication with the oil reservoir and coupled to the shaft, an oil scavenge pump coupled to the shaft and configured to pump oil from the gearbox, and an oil cooler in flow communication with and disposed between the oil scavenge pump and the oil reservoir. The system also includes a bypass drain line disposed between the oil source and the oil supply pump, a drain valve disposed in the bypass drain line configured to close when the pressure is above a predetermined pressure, and a check valve disposed between the oil supply pump and the gearbox configured to open when the pressure is above the predetermined pressure.

Abstract: An arrangement is provided for feeding a liquid additive from a receptacle into a fuel line or into an exhaust line of an internal-combustion engine of a motor vehicle by way of a blockable feed line leading into at least one of the above-mentioned line and by way of a pump which at least temporarily generates a feed pressure in the feed line. The receptacle can be filled with additive from a larger storage tank also accommodated in the motor vehicle by way of a connection line that can be blocked. The feed line branches off the connection line between the receptacle and the storage tank. The pump is installed in the receptacle or between the receptacle and the branching-off of the feed line into the connection line. The connection line can be shut-off in the storage tank or between the storage tank and the branching-off of the feed line.

Abstract: The invention includes a method for continually circulating a fluid in a system, in the absence of an external pumping mechanism, by providing a fluid, an active space capable of generating a higher pressure zone and causing a contiguous lower pressure zone, a passive space, and a porous medium disposed between the active space and the passive space, and generating a pressure differential relationship between the active space and the passive space causing the fluid to circulate freely in both directions between the active space and the passive space, across the porous medium, without the aid of an external pumping system, such that the fluid circulation defines a self-acting self-circulating fluid system, and to the system created thereby.

Abstract: A hydraulic system includes a tank for hydraulic fluid, a supply line connected to the tank and a plurality of hydraulic functions connected to the supply line. Each hydraulic function includes an actuator that is connectable to a load and that has a first side and a second side. Each function includes a first control valve connected to the first side and a second control valve connected to the second side. Each function also has an independent tank line, and the first and second control valves are connected to both the supply line and the independent tank line. A third control valve is connected between the independent tank line and the tank, and a check valve is connected between the supply line and the independent tank line.

Abstract: A hydraulic storage tank is provided. The hydraulic storage tank includes a storage tank, a return flow filtration chamber, a contaminant containment chamber (CCC) and a tube connecting the return flow filtration chamber with the CCC. The storage tank defines a reservoir for storing hydraulic fluid. The return flow filtration chamber is configured to house a return flow filter. The CCC includes a boundary wall bounding a cavity and a CCC outlet fluidly communicating the cavity with the reservoir. The CCC outlet is radially inward from the boundary wall. The tube defines a discharge passage fluidly connecting the filtration chamber with the cavity of the CCC and includes an inlet in fluid communication with the filtration chamber and an outlet in fluid communication with the CCC. The outlet of the tube directs fluid in angular direction about an axis defined by the contaminant containment chamber outlet.

Abstract: A hydraulic system is disclosed. The hydraulic system may have a first circuit fluidly connecting a first pump to a swing motor and to a first travel motor in a parallel closed-loop manner. The hydraulic system may also have a second circuit fluidly connecting a second pump to a second travel motor and to a first linear tool actuator in a parallel closed-loop manner.

Abstract: A hydraulic system is disclosed. The hydraulic system may have a unidirectional variable displacement first pump, a first hydraulic actuator connected to the first pump via a closed-loop first circuit, a unidirectional variable displacement second pump, and a second hydraulic actuator connected to the second pump via a closed-loop second circuit. The hydraulic system may also have a third pump selectively connectable in closed-loop manner to the first or second circuits, and a first valve disposed between the first hydraulic actuator and the first pump and configured to selectively direct fluid from the first circuit to the second and third pumps.

Abstract: A hydraulic system is disclosed. The hydraulic system may have a plurality of closed-loop circuits fluidly connecting a plurality of pumps to a plurality of actuators, and at least one control valve configured to selectively fluidly connect a first of the plurality of closed-loop circuits to a second of the plurality of closed loop circuits. The hydraulic system may also have an accumulator configured to receive pressured fluid from and discharge pressurized fluid to at least the first of the plurality of closed-loop circuits.

Abstract: A hydraulic system is disclosed. The hydraulic system may have a pump, a first actuator, and a meterless circuit connecting the first actuator to the pump. The hydraulic system may also have a second actuator connected to the meterless circuit in parallel with the first actuator.

Abstract: A fuel flow system for a gas turbine engine includes a first pump, a second pump, a bypass loop, an integrating bypass valve and a pilot valve. The first pump connects to an actuator and a metering valve. The second pump connects to the metering valve and is arranged in parallel with the first pump. The bypass loop recycles fuel flow from the first pump and the second pump to inlets of the first pump and second pump integrating bypass valve includes first and second windows. The first window regulates fuel from the first pump through the bypass loop and the second window that regulates fuel from the second pump through the bypass loop. The pilot valve controls the size of the first and second windows.

Abstract: A fuel cartridge with a deformable inner fuel container connectable to a fuel cell is disclosed. The pressure in the inner fuel container is controlled.

Abstract: Systems and method for delivering materials to a tool are disclosed. A material delivery system utilizes two or more sources of the material to be delivered to the tool. One or more of the sources of the tool may be a batch mixer. The material delivery system also includes at least two material delivery recirculation lines providing material to at tool. The material delivery system may be manually or automatically controlled to switch supply of the material from one source to another, and/or to switch from one material delivery recirculation line to another.

Abstract: A rotary valve (1) includes a valve body (2) formed with a chamber communication passage (24) for flowing a main fluid and a vent communication passage (25) for discharging the main fluid and a cylindrical valve member (3) rotatably held in the valve body (2) and formed with a main passage (31) for flowing the main fluid. The cylindrical valve member (3) is rotated to switch the connection of the main passage (31) between the chamber communication passage (24) and the vent communication passage (25). The rotary switching valve (1) further includes a purge gas passage for passing purge gas in a clearance (11) between the valve body (2) and the cylindrical valve member (3), the purge gas being supplied to the clearance (11) to prevent the main fluid from leaking out of the main passage (31).

Abstract: A fluidic device unit structure in which a plurality of fluidic devices are integrated and which is effective in reducing a footprint is provided. With a fluidic device unit structure in which a plurality of fluidic devices that are connected by channels are integrated in a base member 10 in parallel, the base member 10, which has a plurality of mounting surfaces 11 on which pure-water opening and closing valves 5 are mounted, includes a pure-water circulation supply line 2 that passes through the base member 10 and that is connected in parallel to the pure-water opening and closing valves 5 via pure-water branch channels 4.

Abstract: A method for isolating a leak in a closed-volume liquid system comprises circulating a fluid through a plurality of isolatable zones and a non-isolatable zone in a closed-volume liquid system, detecting a leak in the closed-volume liquid system, isolating all of the isolatable zones from the non-isolatable zone, sequentially detecting if the leak is present in the non-isolatable zone and each of isolatable zones, and taking corrective action after the leak is detected.

Abstract: An oil tank has return oil from a hydraulic circuit diffused onto a surface of oil stored in a tank body, and thereby the return oil is prevented from going deep in the oil, so that a hydraulic pump is prevented from sucking oil containing air bubbles. The oil tank includes: an intake port provided in the vicinity of a bottom of the tank body and connected to the hydraulic pump of a hydraulic circuit; and an return oil inlet connected to a return pipe of the hydraulic circuit through which the return oil enters the tank body. In the tank body, a container adapted to hold the return oil is provided. The container is configured so that the return oil inlet opens in the vicinity of the bottom of the container.

Abstract: A fluid supply system is provided, especially for delivering liquid hydrocarbon to a fuel-operated vehicle heater or to a reformer. The system includes a fluid reservoir (12), a first fluid line (28) from the fluid reservoir (12) to an on-off valve (30), a second fluid line (32) from the on-off valve (30) to a first system area (14) to be fed with fluid, and a third fluid line (34) from the on-off valve (30) to the reservoir (12). The on-off valve (30) establishes a connection between the first fluid line (28) and the second fluid line (32) in a first valve position and establishes a connection between the second fluid line (32) and the third fluid line (34) in a second valve position. A first fluid delivery arrangement (26) is provided for delivering fluid from the reservoir (12) into the second fluid line (12). A second fluid delivery arrangement (20, 24) is provided for delivering fluid from the third fluid line (34) into the reservoir (12).

Abstract: According to the present disclosure, a fuel supply system having a recirculation loop is provided. The fuel supply system comprises a fuel tank; a return line coupled fluidly to the fuel tank; a fuel manifold; and a recirculation loop, wherein the return line is coupled fluidly to the recirculation loop at a first node to return fuel from the recirculation loop to the fuel tank, and the recirculation loop comprises a heat exchanger positioned downstream of the fuel manifold and upstream of the first node. The recirculation loop may comprise an orifice positioned upstream of the heat exchanger and downstream of the fuel manifold. Additionally, the fuel supply system may further comprise a supply line coupled fluidly to the fuel tank and further coupled fluidly to the recirculation loop at a second node positioned upstream of the fuel manifold and downstream of the first node.

Abstract: A fuel delivery and control system is provided including a dual pump fluid circuit configuration comprising a fixed positive displacement pump sized to supply the main engine burn flow ranging from above windmill through cruise, a positive displacement actuation pump including a variable pressure regulator, wherein the actuation pump is sized to supply fluid to engine actuators, valves and other hydraulically operated engine components and a pump flow sharing system interconnecting the two pumps. The combined flow from the two pumps is sufficient to meet the engine flow demand for windmill relight and maximum flow conditions. During cruise or normal operating conditions, the pumps operate in completely isolated flow circuits, minimizing recirculation and therefore heat input into the fuel supply system.

Abstract: The invention relates to a plant for recovering a polluting fluid contained in the tank (4) of a sunken vessel (1) comprising a plurality of pipes (5) fixed to a deck (2), wherein each pipe comprises a first and second ends and, according to the beaching position of the sunken vessel, can form means for introducing a pressurized water into the tank or means for removing the polluting fluid outside thereof. Said invention is characterized in that said pipes are positioned in such a way that the ends thereof enters near each top corner of the tank and the second ends thereof are accessible from the inside of the sunken vessel.

Abstract: A process for mixing a liquid or mixture of a liquid and a fine solid present in a vessel, in which the vessel is supplied with the same liquid or the same mixture as a motive jet of a jet nozzle which is present in the vessel and has a motive jet and a momentum exchange chamber, the suction region between motive nozzle and momentum exchange chamber being provided with a sheath which has a suction orifice below the central jet leading from the motive nozzle into the momentum exchange chamber.

Abstract: The present invention relates to a wet-type recirculation system for particle size analysis of sample including coarse particles (hundreds to thousands ?m). According to the wet-type recirculation system of the present invention, the mixture liquid is recirculated using not a single recirculation line but two recirculation lines between the mixer and the particle size analyzer and the recirculation lines are connected with the mixer at the upper inputting part side of the mixer to discharge the mixture liquid. Further, the rotatable baffle is attached to the inside of the mixer to generate vortex in a horizontal direction as well as a vertical direction within the reservoir of the mixer and the baffle is rotated by a pressure of the mixture liquid discharged from the two recirculation lines to form vortex.

Abstract: An inlet stratification device (5) for a circuit circulating a fluid through a tank (1) and for providing and maintaining stratification of the fluid in the tank (1). The stratification device (5) is arranged vertically in the tank (1) and comprises an inlet pipe (6) being at least partially formed of a flexible porous material and having an inlet (19) and outlets formed of the pores of the porous material. The stratification device (5) further comprises at least one outer pipe (7) surrounding the inlet pipe (6) in spaced relationship thereto and being at least partially formed of a porous material.

Abstract: An injection jet includes a body having a first and a second passage disposed therein for channeling a fluid to a working element. The first passage remains fluidly separated from the second passage. A system includes the injection jet along with a main reservoir and an emergency reservoir. The first passage is in fluid communication with the main reservoir, while the second passage is in fluid communication with the emergency reservoir. The system operates in a standard mode and an emergency mode. Both the first passage and the second passage are configured for jointly supplying fluid to the working element during standard mode. The second passage is configured for independently supplying fluid to the working element during emergency mode.

Abstract: A drinking or domestic water system has a conduit system with a connection to a public water supply system, at least one riser conduit with at least one floor-by-floor conduit branching therefrom and at least one circular conduit branched in the flow direction of the water from the floor-by-floor conduit, at least one consumer connected in the circular conduit, and a return conduit into which the floor-by-floor conduit enters, by means of which it can be secured, avoiding high water consumption and thus operating costs, so that the water in the system meets hygienic conditions. The conduit system composed of supply conduit or riser conduit and return conduit forms a closed circulation conduit in which unit for cooling the water flowing through is integrated so that the drinking or domestic water can be cooled to a predetermined temperature.

Abstract: An arrangement for testing a fire suppression sprinkler system includes a supply conduit for supplying a fire suppression fluid to a plurality of sprinklers. A sensor senses a flow of fire suppression fluid through the supply conduit. A drain conduit drains fire suppression fluid when the fire suppression system is tested. A drain valve controls the flow of the fire suppression fluid so that when the fire suppression system is tested the fire suppression fluid is controlled to enter the drain conduit. A fire suppression fluid collection tank collects the fire suppression fluid which has entered the drain conduit for reintroducing the collected fire suppression fluid to the supply conduit. A circulation valve controls the flow of the fire suppression fluid so that when the fire suppression system is tested the fire suppression fluid enters the fire suppression fluid collection tank.

Abstract: Process for storing an additive and injecting it into the exhaust gases of an engine and comprising two tanks for storing the additive and one pump for supplying the additive from these tanks to an injection line, these two tanks being in parallel and each being connected to the pump by a branch of the supply line, each of these branches being equipped with a non-return valve and these two valves being calibrated so that the valve located in the branch coming from the first tank (1) is normally open but closes when this tank is empty, and so that the valve located in the branch coming from the other tank (2) is normally closed but opens when the valve from tank (1) is closed or when the branch coming from this tank (1) is blocked.