Abstract: A coolant supply device 1 includes a coolant tank 2 storing coolant therein, a mounting member 14 covering a part of an upper opening of the coolant tank 2, and supply pumps 32, 33, 34 mounted to the mounting member 14 and configured to pump up coolant C from the coolant tank 2 and supply the pumped-up coolant C to predetermined destinations. The coolant supply device 1 is configured such that the coolant C supplied to the predetermined destinations by the supply pumps 33, 34 is returned to the coolant tank 2. The mounting member 14 is supported by support members 16, 17, 18 such that it is slidable to a non-covered side of the upper opening of the coolant tank 2.

Abstract: A water purification system is configured to create a treated water for a home brewing operation. The water purification system includes a sediment filter, connected to an untreated water source. Untreated water flows from the untreated water source through the sediment filter creating a sediment filtered water. A carbon filter is connected to the sediment filter. The sediment filtered water flows through the carbon filter creating a carbon filtered water. A reverse osmosis system is connected to the carbon filter. The carbon filtered water flows through the reverse osmosis system and is segregated into a treated water and a rejected water. The treated water is distributed to the come brewing operation. A deionizing filter is connected to the reverse osmosis system with an automatic shutoff valve. The deionizing filter receives a second flow of treated water and creates a deionized water.

Abstract: When a lid covers an opening portion formed at an upper end of a filter case with a bottomed substantially cylindrical shape inside which a filter element is disposed, the internal space between the lid and the filter case is formed. A bypass flow path connecting the internal space and outside space is formed in the lid, and a relief valve disposed moveably between a position closing the bypass flow path and a position opening the bypass flow path includes an air bleeder formed from a porous material.

Abstract: A method of producing oil and gas from a gathering manifold or a well. The method includes the steps of channeling field production into a sealed vessel through an inlet pipe, and permitting oil and gas components of the field production to separate naturally from water and other fluids within the vessel. The method further includes the steps of evacuating the separated oil and gas from the vessel via pipelines attached to the vessel at locations corresponding to the separated oil and gas, and pumping seawater into the vessel to pressurize the vessel and thereby aid in the production of oil and gas from the vessel.

Abstract: An improved water-oil separation apparatus with a separation vessel and associated water leg having internal inlet piping that feeds fluids to an engineered degassing boot, having an engineered degassing boot that is more effective in removing entrained gases from the incoming fluid stream, having an umbrella shaped upper baffle instead of an inverted umbrella shaped upper baffle, having an improved oil collection bucket or weir, having a much improved inlet water spiral distribution apparatus, having an improved water leg design, and having a water leg with a functional height that is externally adjustable to make it easier to regulate the oil-water interface level within the separation vessel.

Abstract: An improved water-oil separation apparatus with a separation vessel and associated water leg having internal inlet piping that feeds fluids to an engineered degassing boot, having an engineered degassing boot that is more effective in removing entrained gases from the incoming fluid stream, having an umbrella shaped upper baffle instead of an inverted umbrella shaped upper baffle, having an improved oil collection bucket or weir, having a much improved inlet water spiral distribution apparatus, having an improved water leg design, and having a water leg with a functional height that is externally adjustable to make it easier to regulate the oil-water interface level within the separation vessel.

Abstract: A stormwater treatment system includes water treatment media that defines a helical flow path within a conduit. The water treatment media may include a plurality of helical water treatment media components that are constructed and arranged to seal against an inside surface of the conduit. The individual helical water treatment media components may be installed in situ within the conduit when the conduit is positioned within a chamber having an access opening, and periodically removed and replaced by passing the components to the access opening. The components further may have a flexible frame, which allows the water treatment media to dynamically adjust to swelling of the filtration media and other forces that may occur during use. The performance of the system may be adjusted by adjusting the helical pitch of the helical water treatment media components.

Abstract: A module for optionally recharging sorbent materials in-line, including zirconium phosphate, with an optional bypass and conduits for a sorbent cartridge. The sorbent cartridge can have one or more modules contained therein having connectors connecting each of the modules. One or more of the modules can be reusable and the sorbent materials therein recharged.

Abstract: A water treatment apparatus comprises a chamber divided by a partition into a treatment section and an outlet section. The treatment section may, for example, contain a filter media including organic material which supports a shrub or tree. Runoff water enters the treatment section over an inlet chamber which forms a bridge over the outlet section. During heavy flow conditions, some of the incoming water overflows inlet bypass weirs to pass directly to the outflow section, bypassing the filter media in the treatment section.

Abstract: A fluid strainer is disclosed for use in a fluid piping system, the fluid strainer having a first valve chamber and a second valve chamber. The first valve chamber can have a strainer inlet and contain first and second angled members, and the second valve chamber can have a strainer outlet and contain third and fourth angled members. A first pivotable seal can be movable within the first valve chamber into sealing engagement against either of the first or second angled members, and a second pivotable seal can be movable within the second valve chamber into sealing engagement against either of the third or fourth angled members. A first strainer chamber can be in communication with the first angled member and the third angled member, and a second strainer chamber can be in communication with the second angled member and the fourth angled member.

Abstract: A biological wastewater treatment system is provided comprising a watertight basin and a filter. The basin has an open top and is configured for being placed on a substrate. The filter is located in the basin and includes five layers, each layer configured for removing biological contaminants from water traveling therethough. A first perforated pipe is located in the second layer and is connected to a second perforated pipe located in the fourth layer. If the third layer becomes clogged and prevents the passage of water, the water in the second travels into the first perforated pipe and exits the second perforated pipe in the fourth layer. In this manner, the third layer is bypassed, and the treatment system can be used despite the clogging of the third layer.

Abstract: The invention provides a bioretention system comprising one or more chambers and a high flow bypass system with top and bottom weirs for water filtration and storm water flow management. The invention also provides methods that are useful for managing storm water flow and inhibiting the flow of pollutants, debris, and other contaminants into drainage systems.

Abstract: A storm water treatment system accomplishes low impact development compliant treatment of storm water with filtrate discharged to an underground infiltration structure. The system has an automatic high-flow bypass under gravity flow, even on flat sites, plus automatic standing water drain-down for mosquito control and de-watering of collected solids. This system incorporates unique distributional piping schemes enabling periodic removal of suspended solids from otherwise inaccessible structures.

Abstract: An apparatus for separating a liquid from other substances comprises a first chamber, a second chamber, an inlet connected to the first chamber, an outlet connected to the second chamber, a bypass conduit passing from the inlet, through the first chamber, and into the second chamber, and a passage between the first and second chambers and configured to allow the liquid to flow from the first chamber to the second chamber, the passage located below the bypass conduit, wherein the bypass conduit comprises a first orifice located within the first chamber and a second orifice located in the second chamber.

Abstract: A wastewater treatment process that produces primary sludge and biological sludge. The system and process hydrolyzes the biological sludge in a hydrolysis reactor. The primary sludge is directed to a pasteurization unit and pasteurized. Thereafter, the hydrolyzed biological sludge and the pasteurized primary sludge are directed to an anaerobic digester where the combined sludges are subjected to anaerobic digestion.

Abstract: A self-bypassing filter system for a fluid reservoir. The system includes a filter disposed within the reservoir, positioned to intercept the fluid flow proceeding out of the reservoir. A bypass fluid flow path extending from upstream to downstream of the filter, without passing through the filter. In addition, the system includes a membrane, positioned to completely block the bypass fluid flow path upstream of the filter, the membrane being formed of a material dissolvable in the fluid.

Abstract: A membrane separation device that treats water constructed such that at least two permeate streams of different electrical conductivity are generated therein, including at least two membrane modules arranged in a common pressure vessel such that they can be successively subjected to incoming flow of the water to be treated, wherein the pressure vessel is a tube in which the at least two membrane modules are arranged one behind the other in an axial direction and the at least two membrane modules are spirally wound modules.

Abstract: Apparatus for treating run-off water, the apparatus including a mechanical-sorption filter for removing particulate and colloidal material; an ion exchange filter for removing positively charged ions; and, a sorption filter for removing at least other soluble contaminants.

Abstract: A method and apparatus for removing metallic material from a circulating well fluid stream provides a treatment vessel that is divided into first and second sections. Each of the sections includes a magnetic field that can be in the form of one or more magnets. In one embodiment, multiple magnets are provided in each of the sections. Manifolds attach to an influent and to an effluent of the treatment vessel. Each manifold enables selective transfer of fluid to either of the selected sections. Similarly, discharge of circulating fluid can be from either of the sections via a discharge manifold. The treatment vessel enables continuous treatment by valving fluid flow so that only one section need be used at a time in order that the other section could be serviced for removing collected metallic material from the magnetic field or from the magnets.

Abstract: The device described in the present invention can trap plugging particles contained in the liquid feed supplying a reactor functioning in gas and liquid co-current down-flow mode using a specific distributor tray comprising a filtration medium. The present device is of particular application to the selective hydrogenation of feeds containing acetylenic and dienic compounds.

Abstract: A power steering fluid filter includes a housing that defines an interior chamber, an inlet port communicating with the upstream end of the interior chamber, and an outlet port communicating with the downstream end of the interior chamber. A movable thimble filter is disposed within the housing and an annular magnet is located at the mouth of the thimble filter. A spring biases the thimble filter and magnet toward the inlet port of the housing. In use, power steering fluid passes through the housing and debris is captured by the thimble filter. Ferrous particles entrained in the fluid flow are attracted to and captured by the magnet. When the thimble filter becomes clogged, it is displaced by the pressure of the fluid against the clogged filter so that fluid can flow around and bypass the thimble filter while still being exposed to the magnet for removing ferrous particles.

Abstract: The present invention relates to a mobile water purification system employing crossflow filtration, such as reverse osmosis filtration. One embodiment of the invention discloses a mobile water purification system comprising a housing, a pump unit and a piping system for providing fluid communication between a water inlet, a pre-filtration unit, a crossflow filtration unit, a disinfection unit and an outlet for supply of purified water, wherein the pre-filtration unit comprises sediment/cartridge filtrations means and dechlorination means, the cross-flow filtration unit comprises a plurality of parallel and/or sequentially arranged membrane filters, and the piping system is reconfigurable such that the crossflow filtration unit can be bypassed. The present water purification system is adapted to be deployed in remote areas substantially anywhere in the world.

Abstract: A stormwater gully comprises a chamber in which an outlet assembly is installed. The outlet assembly comprises filter units connected to an outlet housing. In use, stormwater can flow from the chamber in an upwards direction through filter units into the outlet housing. The outlet housing has an outlet, which extends from the gully. At high rates of flow, the water level in the chamber will rise until water can flow into the outlet housing through bypass inlets. The bypass inlets are connected to the interior of the housing by siphons defined by arched regions of a top cover. The siphons allow rapid discharge of water until the water level returns below the level of the bypass inlets. A slow drain down feature is provided which enables the chamber and outlet assembly to be drained below the level of the primary inlet.

Abstract: Three flow paths within a single container are provided for the separation of contaminates, such as floating debris, heavy trash, lighter fluids and heavier fluids, from an effluent stream. A first flow path is provided for low flow conditions wherein the effluent stream pools in a first chamber within the container and the surface of the pooled fluid is drawn off, leaving heavy contaminates within the first chamber. The drawn fluid, with lighter and/or floating contaminates, enters a second chamber. The fluid is drawn from the second chamber below the surface level of the fluid, leaving the lighter and floating contaminates within the second chamber. In moderate flow conditions, a second flow path is established from the first chamber and out the container, bypassing the second chamber. Fluid for the second flow path is drawn from below the surface of the fluid in the first chamber to exclude light and floating contaminates.

Abstract: The invention relates to a method for two-step separation of water, salt and particles from a hydraulic fluid by the use of a control unit. The hydraulic fluid is carried into a return oil tank with an electrostatic coalescer provided with a high-voltage transformer with direct current to two electric grids whose electrostatic field gathers water into drops which settle into a collecting tank. The hydraulic fluid is circulated to a filter module for removing any remaining water, salt and particles in filter elements connected in parallel, having hygroscopic cellulose fibers which swell until saturation, the swelling being measured by a sensor measuring the degree of saturation, alternatively conductivity.

Abstract: A collection valve for use in a water reclamation system is provided. The collection valve comprises (i) a drain pipe connectable to a drain line in which gray water flows, the drain pipe comprising an inlet pipe, a medial pipe, and an outlet pipe; the medial pipe having a first opening rotatable from a first position to a second position; (ii) a valve plug pipe, surrounding the medial pipe, having an second opening; and (iii) an actuator assembly for rotating the medial pipe between the first and second positions. Rotating the medial pipe to the first position causes the first opening to be in alignment with the second opening causing gray water to drain into a tank. Rotating the medial pipe to the second position misaligns the first and second opening causing fluid passing through the medial pipe or drain to a sewer or septic tank.

Abstract: A portable water treatment plant includes a membrane filter, a booster pump and a pressurized water tank. The membrane filter preferably receives water through a pump in a screen filter, but could receive water from other sources. The booster pump pumps water from an output of the membrane filter into the pressurized water tank. The water from the membrane filter is preferably pumped through at least one carbon filter for additional filtering. An air compressor is used to inject air into a backwash solution. An auxiliary inlet and an auxiliary outlet are created to receive a removable reverse osmosis filter. An electronic controller includes a touch screen monitor, which provides control of and displays various information concerning the portable water treatment plant. The electronic controller senses the insertion of the reverse osmosis filter into the portable water treatment plant. Chemicals in the cleaning solutions are neutralized before discharge.

Abstract: The invention provides a bioretention system comprising one or more chambers and a high flow bypass system with top and bottom weirs for water filtration and storm water flow management. The invention also provides methods that are useful for managing storm water flow and inhibiting the flow of pollutants, debris, and other contaminants into drainage systems.

Abstract: There is disclosed a unique water treatment system which incorporates a unique primary valve. The primary valve comprises an interconnected first part and second part. The first part attaches to a water source and provides untreated water to water treatment units which are controlled by the second part of the primary valve. Untreated water flows to a first water treatment unit and subsequently through a valve to the second part of the primary valve and to use or to a second water treatment unit. From the second water treatment unit the water flows to the second part of the primary valve and to use. The second part of the primary valve has a unique bore and slideable shaft valve structure. The water treatment units can purify the water and/or add substances to the water.

Abstract: Systems and methods for the recovery of iodine are described. In particular, recovery systems and methods produce an iodine complex from an aqueous brine containing iodide. A head tank for maintains a supply of the brine, a pH controller acidifies brine received from the head tank and an oxidizer converts iodide in the acidified brine to elemental iodine. At least one activated carbon contactor module is removably inserted into a stream of the oxidized brine provided by the oxidizer and binds the molecular iodine to form the iodine complex. A container may enclose the head tank, the pH controller and the oxidizer in order to facilitate transportation of the system and performance of the methods and processes in proximity to a brine source. The brine may be employed or associated with oilfield operations.

Abstract: A system designed to control and filter runoff water in storm drains is presented. Drain water frequently carries trash, organic matter, suspended solids, hydrocarbons, metals, nutrients and bacteria collected from streets and parking lots into a storm drain inlet, which enters storm water drain pipe systems. The present invention supplies a series of baffle boxes inserted in the drain water stream with a final box possessing an upflow filter and a hydrocarbon absorbing boom. The system can also support a storm flow bypass that directs high-flow storm runoff water directly to the outlet to protect the filter system.

Abstract: A stormwater gully comprises a chamber in which an outlet assembly is installed. The outlet assembly comprises filter units connected to an outlet housing. In use, stormwater can flow from the chamber in an upwards direction through filter units into the outlet housing. The outlet housing has an outlet, which extends from the gully. At high rates of flow, the water level in the chamber will rise until water can flow into the outlet housing through bypass inlets. The bypass inlets are connected to the interior of the housing by siphons defined by arched regions of a top cover. The siphons allow rapid discharge of water until the water level returns below the level of the bypass inlets. A slow drain down feature is provided which enables the chamber and outlet assembly to be drained below the level of the primary inlet.

Abstract: A heat exchanger for cooling a liquid has an inlet and an outlet for a liquid to be cooled. A bypass is provided that bypasses the heat exchanger. A valve controls flow of liquid into the heat exchanger or into the bypass. The valve has a valve seat, a valve cone, and at least one spring made of a shape memory material. The at least one spring counteracts a liquid pressure existing in the inlet.

Abstract: A process for producing ultrapure water, in which a stream of water is purified in a reverse osmosis device, wherein the water stream is subject to pretreatment including splitting the water stream into at least two partial streams, partial exchange of cations present in at least one of the partial streams for H+ ions by a cation exchanger operated in the H? mode, and complete exchange of the anions present in at least one further of the partial streams for OH? ions by a softener operative in parallel to the cation exchanger, and treating the partial streams treated by the cation exchanger and the softener by at least one anion exchanger operating in the OH? mode, and wherein the water stream obtained from the pretreatment is fed into the reverse osmosis device.

Abstract: A debris filtering apparatus and method. The apparatus includes a first filter assembly. The first filter assembly includes an outer conduit and an inner conduit received within the outer conduit. An inner conduit flow-path is defined within the inner conduit and an outer conduit flowpath is defined between the inner conduit and the outer conduit. The inner conduit includes a filter. A fluid inlet is in communication with the inner conduit flowpath and a fluid outlet is in communication with the outer conduit flowpath. The filter permits a fluid to pass between the inner conduit flowpath and the outer conduit flowpath while retaining debris within the inner conduit. The method includes passing the fluid through the first filter assembly, removing the inner conduit from within the outer conduit, removing the debris from the inner conduit, and replacing the inner conduit within the outer conduit.

Abstract: A water producing system is provided that produces fresh water by treating treatment target water A at a first semipermeable membrane treatment plant, that mixes concentrate resulted by the treatment carried out at the first semipermeable membrane treatment plant with treatment target water B, and that treats the mixed water at a second semipermeable membrane treatment plant to produce fresh water. A bypass line allows the treatment target water A to be mixed with the treatment target water B or the concentrate while bypassing the first semipermeable membrane treatment plant, so that the second semipermeable membrane treatment plant can operate even when any trouble occurs at the first semipermeable membrane treatment plant and treatment cannot be carried out thereby.

Abstract: A method of starting up a filtration plant for the filtration of a process liquid, after cleaning of the filtration plant, and a filtration plant which is arranged to be able to started up in accordance with this method. A secondary liquid supply unit connected to the post-treatment equipment during the starting up of the plant provides a flow of e.g. sterilized water to the post-treatment equipment, so that this can be held in a condition in which it is ready for operation. Thereafter, the process liquid is led to the filtration equipment, and the flow of liquid from the secondary liquid supply unit to the post-treatment equipment is shut off when a flow of filtered process liquid is obtained, and which thereafter replaces the liquid from the secondary liquid supply unit.

Abstract: A water-on-water filtration system is provided that includes a filter member (480), two water-on-water vessels, and a precision metering device. Each water-on-water vessel also includes a first and a second chamber as well as a first piston (412) defining a mixing portion and a driving portion of the first chamber and a second piston (422) defining a concentrate portion of the second chamber. The system includes a plurality of valves that are controlled to place the first vessel in a fill state in which the first vessel is being filled with filtered water and concentrate, and a service state in which the diluted concentrate is pushed through a product conduit to its end use.

Abstract: A return flow filtration assembly for filtering return hydraulic fluid is provided. The filtration assembly includes a first return fluid chamber including a first inlet and first and second of outlets. The second outlet is configured to be coupled to a secondary return flow filter for providing micro-filtering of the return fluid. The first outlet includes a restriction element for restricting flow through the first outlet and generating an artificial back pressure within the first return fluid chamber to drive fluid through the second outlet, when the second outlet is coupled to a secondary return flow filter.

Abstract: An improved biological fluid filtration system is shown having, seriatim, a blood container, a biological fluid filtration device downstream of the blood container, and a blood receiving container downstream of the biological fluid filtration device; a bypass line is provided to allow fluid communication between the blood container and the blood receiving container, the bypass line includes a loop, the loop of the bypass line being configured to be disposed above the blood container at a sufficient height to prevent the passage of fluid around the leukocyte depletion device; the loop of the bypass line being disposed in a tube support device, the tube support device being configured to support substantially the entire weight of the biological fluid filtration system without substantially crimping said bypass line.

Abstract: The anti-clogging drainage inlet is adapted for use in lawn or field environments that require drainage systems to prevent flooding or unwanted pooling during periods of rain. The inlet includes a grate mounted to a rectangular frame. The frame and the grate are adapted to be positioned in the opening of a conventional drainage box in a manner that the top surface of the grate is flush with the surface of the lawn or field. A linkage system is mounted to the frame and grate and operates to raise the grate from its flush position. The linkage system includes a container positioned below the grate and within the drainage box.

Abstract: A modular water filter assembly is disclosed. The modular water filter assembly includes a primary module having primary filter media for treating water; a secondary module having a first end and a second end; and a manifold defining an inlet connectable to a water source, and an outlet connectable to a water dispenser. The secondary module is removably coupled to the manifold at the first end thereof, and to the primary module at the second end thereof, the secondary module defining a flow path for carrying water therethrough. The water filter assembly is variably configurable for treating water passed from the water source through the inlet of the manifold and through at least one of the primary module and the secondary module and then through the outlet of the manifold. An appliance incorporating such a modular water filter assembly is also disclosed.

Abstract: A visual bilgewater quality indicator for use in a bilgewater filtration system which includes a filtration stage for removing oily contaminants. The quality indicator utilizes one or more filtration status chambers which are provided with a fluorescent or phosphorescent dye or pigment treated filtration media. The status chamber has a transparent outer wall. Flow through the status chamber is from the outer lateral wall toward its central axis, whereby oily contaminants in the flow collect selectively at the outer portions of the filtration media which are highly visible to an observer. Oil droplets as small as one micron, are captured and immobilized by the primary filter and are instantly visible against the background of the exemplary dye. If two status chambers are used in series, due to the ability of the infused media to permanently capture oil without re-entrainment, the second chamber is always kept transparent until complete loading and supersaturating breakthrough at the primary chamber.

Abstract: A portable lubricant filtration system and method is provided for facile pre-filtering of used or new lubricant prior to pumping the lubricant into its intended machinery.

Abstract: A stormwater detention system includes a containment row for removing and collecting solids from stormwater. The containment row may be surrounded by a water-impermeable membrane, and designed to receive incoming water before other rows of the detention system. The containment row collects solids from the stormwater before the water is redirected into one or more additional rows, which are water permeable and buried in water permeable media. Filter structure may be associated with a flow system that delivers water from the containment row to the additional rows.

Abstract: An object is to provide a fresh water generating method that is capable of efficiently producing purified water, such as fresh water, from unpurified water, such as sea water. Provided is a fresh water generating method for generating fresh water by way of reverse osmosis membrane filtration, which includes mixing sea water with low salt concentration water having a salt concentration lower than sea water to produce mixed water, and subjecting the mixed water prepared by the mixing to reverse osmosis membrane filtration, thereby generating fresh water.

Abstract: An embodiment of the present invention includes: a spiral type pressure vessel 15 in which a plurality of reverse osmosis membrane apparatuses 13-1 to 13-10 having spiral reverse osmosis membranes is connected through a permeated water pipe 14, and is housed in a connected state; a raw water supplying line that supplies raw water 11 into the pressure vessel 15; a concentrated water discharging line through which concentrated water 16 concentrated is discharged; a plug 17 that blocks the permeated water pipe 14 at the center of the reverse osmosis membrane apparatuses 13-1 to 13-10; a front-side permeated water line and a front-side permeated water line through which front-side permeated water 12-1 and rear-side permeated water 12-2 are discharged to the exterior, respectively, which are separated fore and aft, respectively, of the permeated water pipe 14 blocked by the plug 17; a pressure regulating valve 20 that is mounted in the raw wares supplying line and regulates the supply pressure of the raw water 11;

Abstract: An underground stormwater management system includes a receiving tank connected to a source of non-first flush runoff and a storage chamber that accumulates stormwater runoff for discharge to a storm drain. The storage chamber includes a first inlet connected to a source of first flush runoff, a second inlet connected to receive overflow from the receiving tank, a first discharge and a second discharge above the first discharge. First flush is discharged from the first discharge and is filtered before reaching the storm drain. The receiving tank assists in delaying the receipt of non-first flush runoff into the storage chamber during a major rain event. During major rain events runoff is also discharged from the storage chamber directly to the surrounding media.

Abstract: A liquid filter heat exchanger unit has a heat exchanger having an inlet through which a liquid is supplied to the heat exchanger and a drain through which the liquid exits after having passed through the heat exchanger. The unit also has a liquid filter with a filter housing and a filter element exchangeably arranged in a receiving chamber, wherein the liquid is supplied through the drain of the heat exchanger to an unfiltered side of the filter element. A bypass connects an inlet passage for supplying the liquid to be filtered to the receiving chamber in the filter housing. A switching member opens and closes the bypass. The switching member is formed by the filter element such that the bypass is closed when the filter element is inserted in the filter housing and is opened when the filter element is removed from the filter housing.

Abstract: A filter arrangement for filtering liquids has a central tube and a first filter element flowed through in radial direction outwardly and disposed on the central tube. A downstream second filter element is disposed on the central tub and flowed through in radial direction inwardly. The first filter element is moveable along the central tube from a basic position into an extended position. In the basic position a connection between the inlet line and a clean side of the first filter element is provided by the first filter element. In the extended position a bypass between an inlet line and the clean side of the first filter element is provided to bypass the first filter element. A spring element, applying a restoring force in a direction of extension of the central tube, is arranged on the first filter element at a side facing away from the second filter element.