Abstract: Fire fighting equipment is adapted for installation in association with a swimming pool or spa and associated water filtering and circulating equipment. A three-way valve is fluidly connected to a pipe which delivers water to a swimming pool filter under the pressure of a pump normally used for circulating water in the conventional swimming pool installation. The three-way valve or equivalent valve system, normally delivers the water to the filter from where it is recirculated into the swimming pool or spa. The three-way valve, or equivalent valve system, is capable of optionally diverting a substantial amount of the water, under the pressure of the pump, into a fire hose which is fluidly connected to the three-way valve. The fire hose, with a suitable hose attached to one end thereof, is thus capable of fighting a fire in the proximity of the swimming pool by using the available water and pump normally associated with the swimming pool.

Abstract: A monitoring device (18, 19 or 21) for optically monitoring residual contamination of oil particles is arranged downstream of filter zone for filtering water (9) in order to block off, if necessary, a discharge line (7). Circulatory operation in which the liquid is recycled through the filter zone (9) is preferably first switched in on exceeding a threshold value for the residual contamination, in order to overcome any eventually occurring "apparent contamination", for example small air bubbles, there is also provided mechanisms for distinguishing between residual and apparent contamination.

Abstract: A method and apparatus for removal of solids from aqueous wash solutions such as, but not limited to, solutions used in hot jet-spray parts washers. Coarse solids are removed by a vortex separator during all operations. Solids accumulated in the parts washer storage tank are intermittently removed and fine solids are removed by intermittent depth filtration. In one embodiment of the invention, the method includes the purging of the vortex separator to the primary stage of depth filtration.

Abstract: Hydraulic energy is recovered from the waste brine through a control device, having a central rotatable spool piece controlling fluid flow paths therethrough. The control device, in turn, directs the brine stream of reverse osmosis systems by diverting the brine into work exchangers used to pressurize the feed liquor. All components are made of corrosion resistant materials suitable for use in brine environments. Membrane pressure is held stable by equalization lines within the control device. System capacity can be adjusted externally by changing control dwell time.

Abstract: A multi-stage fluid filter filters entrained particulate matter from a moving fluid stream at substantially constant fluid pressure and filtration efficiency during continuous on-line operation. The filter includes a housing having a fluid inlet and a fluid outlet, first and second stationary filtration elements positioned in the housing, each having a filtration medium therein from an upstream side to a downstream side thereof. The two elements are positioned in series for fluid flow from the downstream side of one of the two elements defined as a first filter stage for accumulating particulate matter on the filtration medium thereof to the upstream side of the other of the two elements defined as a second filter stage having a previously accumulated layer of particulate matter on the filtration medium thereof.

Abstract: An axial flow filtration cartridge, a system, a support assembly, an apparatus, as well as a process are provided for removing particulate matter as well as dissolved heavy metal ions and the like from an aqueous effluent stream. The invention is useful for removing contaminants from industrial waste streams. The cartridge contains features which make it relatively resistant to fouling by solid particles. Additionally, the cartridge has no central void volume. No separate housing for the cartridges is required. In a system embodiment the cartridge has a filtering chamber containing absorbent clay particles confined between porous liquid-permeable retainer means. An upstream cartridge cap and a downstream cartridge cap removably receive the ends of the filter cartridge in a liquid-tight seal. The flow of aqueous effluent to each of the cartridges is individually controlled.

Abstract: Apparatus is described for use in an industrial plant that contain machines (14) having oil reservoirs (12), which facilitates cleaning of the oil. The apparatus includes a stand (20) and equipment mounted on the stand, including input and output hoses (36,38) whose ends can be dropped into a machine oil reservoir. The equipment on the stand also includes a centrifuge (24), pump (26), valve (34), and porous filter device (40). In a first mode of operation, the pump draws oil from the reservoir to flow through the input hose into the centrifuge, and then to the output hose to flow back to the reservoir. The valve can be switched to a second mode wherein fluid from the input hose is directed through the pump to the porous filter device, for final cleaning of the oil before returning it to the reservoir. The stand has wheels to enable it to roll to another machine and clean its oil.

Abstract: A self-cleaning filter comprises a filter element in a housing. A cleaning unit, movable with respect to the filter element, removes filtered-out solids from the upstream face of the filter element. The cleaning unit includes an axially movable cleaning element engageable with the filter element.

Abstract: There is provided a tap water purifier to be directly coupled to a faucet pipe, which includes a water purifying barel filled with a filter medium and a cylindrical valve body integral with the purifying barrel. The purifying barrel having opposite opening ends. The valve body is inserted in a cylindrical bore formed in a casing for rotation about the longitudinal axis of the valve body. The casing has tap water inlet port means, tap water outlet port means and purified water outlet port means formed therein, the tap water inlet port means and the purified water outlet port means opening to the cylindrical bore in the casing at an angular distance of 180.degree. from each other in the same axial position. The valve body includes first and second flow path means formed therein, the first flow path means being communicated with one opening end of the purifying barrel, the second flow path means being communicated with the other opening end of the purifying barrel.

Abstract: A multi-functional valve includes a body and a circular piston. The piston has at least one circular O-ring surrounding the piston body. There is also a side mounted O-ring with a central axis substantially perpendicular to the circular O-ring.

Abstract: A fresh water generator includes a primary pump for pumping up water to be treated, a secondary pump for pressure sending, and a filtering device for purifying the water to be treated which is sent from the secondary pump by pressure. The fresh water generator further includes interlocking devices for interlocking clutch means of transmission devices and an operation lever of a three-way valve. The operation lever can be switched to one position from the other position and vice versa. The one position is a position in which the clutch means are actuated, thereby transmitting drive power from an internal combustion engine to the primary pump. The other position is a position in which the clutch means are relaxed, thereby blocking transmission of the drive power to the primary pump.

Abstract: A multi-functional valve has a combined safety, bypass, shut-off and inservice capability. The multi-functional valve is modified to attach directly to the cylinder of an exchange unit of water treatment. This multi-functional valve has a base member and a head portion. The base member fits onto the exchange cylinder. The head portion of the multi-functional valve includes a water receiving section capable of being tapped directly into the waterline. Mounted to the head section is a lever arm to move the valve to the desired position.

Abstract: The improved valve apparatus is particularly useful in connection with fluid filtering using a cartridge. The apparatus includes a valve body with inlet and outlet ports and a rotatable spool mounted in the body. The spool has an angularly affixed seal member which directs fluid flow. When the spool is in one position, fluid is directed along a flow path which includes the inlet port, the cartridge and the outlet port. When the spool is in the other position, fluid is directed along another flow path which includes the ports but which bypasses the cartridge. In that way, the cartridge can be replaced without interrupting continuity of flow.

Abstract: A valve assembly for use in a filter device is disclosed herein. The valve assembly includes a valve housing, a cylindrical bore in the housing defining at least one open end, a valve stem inserted in the bore and including a groove about the circumference thereof, and a face plate mounted onto the housing about the open end in locking engagement with the housing. The face plate is provided with a cylindrical opening for receiving the valve stem, and a plurality of compressible fingers with gripping tabs about the distal end thereof which engage with the circumferential groove when the stem is inserted into the opening to create a fixed, rotatable relationship with the valve housing. The face plate also includes a locking tab which engages a recess in the housing to lock the face plate to the housing.

Abstract: A twin filter comprises two filter housings 11 and 12 which are selectively supplied by a switchover device having a housing 13 with a liquid to be filtered. A closure slide 42 is movable in the housing 13 into two closed positions in which it blocks the supply of the liquid to one of the two filter housings. The closure slide 42 is released from its closed position for displacement into the respective other closed position by a releasing device in the form of a lifting device 48.

Abstract: The invention provides a faucet-mounted water filter comprising an upright tubular diverter body that is adapted to be secured to the open end of the water faucet. At the bottom of the diverter body is a water outlet through which unfiltered water can be dispensed. In the diverter body is a valve with a valve outlet duct projecting from one side of the diverter body. A manually movable valve handle projects from the diverter body and is connected to the valve for directing the flow of water either through the water outlet (when unfiltered water is required) or for diverting water through the outlet duct. A filter housing is mounted upon the duct and is preferably connected to the diverter by means of the duct. A carbon block filter element is provided in the filter housing which includes a vertical water inlet surface on an outside wall and a water outlet at the bottom. The filter housing includes an annular water distribution chamber for unfiltered water which surrounds the filter element.

Abstract: The present invention comprises a closed-loop filter system for continuously removing a metal hydroxide precipitate from an alkali metal hydroxide solution. The filter system comprises a filter having a filter surface and a plurality of small diameter openings in said surface. The alkali metal hydroxide solution is impacted onto said filter surface, metal hydroxide precipitate agglomerating on said surface. The filter surface openings have an average diameter effective for said agglomerating. Means are provided to remove the agglomerated precipitate from said filter surface, and to separate the agglomerated precipitate from the alkali metal hydroxide solution, the agglomerated precipitate having a particle weight to surface area ratio effective for said separation.

Abstract: As useful in a filter device for diverting fluid flow either through a filter medium or directly in by-pass thereof, there is disclosed a valve stem for a fluid diverter valve to divert water from an inlet in the valve selectively to each of two outlets in the valve, and a compressible o-ring surrounding the valve stem and forming a fluid tight seal between the outlets. The valve stem fits in a cylindrical bore of a valve body having an inlet and first outlet perpendicular to the axis of the stem, and a second outlet in axial alignment with the stem. Radial conduit means in the stem are aligned with the valve inlet and first outlet. One end of an axial conduit in the stem is aligned with the inlet of the valve and the other end of the axial conduit opens to the second outlet.

Abstract: A shower filter is adapted to be installed between a plumbing pipe and a shower head. The filter includes a changeable filter cartridge. A three position valve in the appliance is able to (a) block all flow of water, (b) deliver filtered water, or (c) deliver unfiltered water. An adapter may be used to enable the appliance to receive different types of filter cartridges.

Abstract: An apparatus is disclosed for allowing mixing of solutions in low gravity environments so as to carry out crystallization of proteins and other small molecules or other chemical syntheses, under conditions that maximize crystal growth and minimize disruptive turbulent effects. The apparatus is comprised of a housing, a plurality of chambers, and a cylindrical rotatable valve disposed between at least two of the chambers, said valve having an internal passageway so as to allow fluid movement between the chambers by rotation of the valve. In an alternate embodiment of the invention, a valve is provided having an additional internal passageway so that fluid from a third chamber can be mixed with the fluids of the first two chambers. This alternate embodiment of the invention is particularly desirable when it is necessary to provide a termination step to the crystal growth, or if a second synthetic step is required.

Abstract: A vascular access device includes a case having a first connection structured to couple with an end of a cut blood vessel such as an artery, a second connection structured to couple with an end of a cut blood vessel such as a vein, and access ports for removal means and admission means to be connected into the blood vessels. A valve is arranged in a rotating manner with two positions defining two independent passages. In a first position the valve establishes connection between the first connection and one of the access ports and between the second connection and the other of the access ports, respectively. The first position is apt for performance of a blood purification treatment. In a second position of the valve, one of the passages establishes mutual connection between the connections and the other of the passages establishes mutual connection between the access ports.

Abstract: A device (10) for filtering and directing effluent to one of a plurality of angularly spaced drainfield trenches. The device (10) includes a housing (12) in which a core (14) is received. A filter medium (18) is inserted within the core (14) and extends around an inside of the core (14). Effluent channelled into the core (14) passes outwardly therefrom through a port (52) formed therein. This port is in registration with one of a plurality of ports (54) formed in the housing (12). Selective registration is accomplished by rotating the core (14) relative to the housing (12).

Abstract: A filter unit using a bump-type filter is disclosed. Briefly stated, a chamber has a split fluid inlet conduit so that contaminated fluid, upon entering the chamber, is directed upwardly towards filter tubes and downwardly towards the bottom of the chamber. The fluid flow is diverted during startup so as to be directed only downward thereby enabling precoat of the filter element. Two tube sheets are utilized with incoming fluid in the vertically upward inlet conduit forcing incoming contaminated fluid to be deposited between the two tube sheets thereby. During operation contaminated fluid flows upwardly and downwardly towards the filter tubes so as to prevent disturbance of filter tubes as a result of turbulence in the chamber.

Abstract: A valve comprises a housing having an inlet port, an outlet port, and a backflush port for discharging the dirt from the filter during a backflushing operation. A first passageway interconnects the inlet port and outlet port, and a second passageway interconnects the outlet port and the backflush port. A displaceable valve member is movable to a filtering position to effect a filtering operation wherein the inlet port is connected to the outlet port via the first passageway, or to a backflushing position to effect a backflushing operation wherein the outlet port is connected to the backflush port via the second passageway.

Abstract: An installation having interchangeable functions for the replacement of the natural filtration of the blood. The installation has a reservoir of a sterile physiological solution. A three-way valve is provided in communication with an outlet of the reservoir. By selective adjustment of the three-way valve, the physiological solution from the reservoir may be selectively conveying to a first compartment of an exchanger for the spontaneous or assisted blood circulation and a second compartment for spontaneous or assisted circulation of a dialysis liquid and/or of an ultrafiltrate. A hydraulic resistor is provided for adjusting the circulation conditions of the physiological solution.

Abstract: A water filter has an elongated base with an inlet opening near one end thereof to which is secured an adaptor ring for attachment to a water faucet. A first outlet opening on the base dispenses unfiltered water and there is a channel defined within the base that leads toward the other end, with an externally-operable valve being included for selecting between unfiltered flow to that outlet and flow down the channel. Located near the other end of the base is a mounting on which sits a water filter cartridge that communicates with the channel, and the cartridge delivers filtered water to a second outlet. A number of features include a color indicator to exhibit degree of cartridge usage, a reversible adaptor ring to accommodate different faucets and there are different aerator structures. Of particular note is the replaceable cartridge which includes a deflector for obtaining better usage of the main filtering material, an exteriorally-mounted first filter and an internally-mounted second filter.

Abstract: A valve-in-head filter includes an outer housing (2) adapted to receive a fluid filter cartridge (4) therein. A valve head (7) is provided which includes an annular stand pipe (22) for locating an end of the filter. The stand pipe is cut away (32) on its downstream side to reduce fluid back pressure. Furthermore, a passage (13) is disposed between the head inlet (11) and outlet (12), with the passage receiving a slidable plunger (23) therein. A manually actuatable handle (28) connects through a rotary actuator (29) to move the plunger. The actuator includes a stem (30) mounted eccentrically to the handle axis, with the stem received in a recess (31) in the plunger so that turning of the handle moves the plunger between "on" and "off" positions. The plunger includes a seal (26) which continuously engages the passage wall in all plunger positions, and the construction provides full "on" and "off", with no fluid bypass in the "off" position.

Abstract: A dialysis reuse system for cleansing, sterilizing and testing a hemodialysis machine and its associated dialyzer and blood tubing set. The reuse control device automatically controls either the selected reuse cycle or dialyzer test cycle as desired. In the reuse cycle a proper solution of bleach, rinse water and formaldehyde disinfectant is flushed through the system for a prearranged time period and in proper sequence to completely cleanse and disinfect the entire dialysis system including the dialyzer and blood lines. At the end of the cycle, the system is isolated, leaving the disinfectant solution intact within the system to prevent bacteria growth and contamination. In the dialyzer test cycle, a dialyzer clearance test is automatically performed using the associated hemodialysis machine to test the condition of the dialyzer membrane prior to patient treatment.

Abstract: A water filter has an elongated base with an inlet opening near one end thereof to which is secured an adaptor ring for attachment to a water faucet. A first outlet opening on the base dispenses unfiltered water and there is a channel defined within the base that leads toward the other end, with an externally-operable valve being included for selecting between unfiltered flow to that outlet and flow down the channel. Located near the other end of the base is a mounting on which sits a water filter cartridge that communicates with the channel, and the cartridge delivers filtered water to a second outlet. A number of features include a color indicator to exhibit degree of cartridge usage, a reversible adaptor ring to accommodate different faucets and there are different aerator structures. Of particular note is the replaceable cartridge which includes a deflector for obtaining better usage of the main filtering material, an exteriorally-mounted first filter and an internally-mounted second filter.

Abstract: A strainer for trapping solid particles entrained in a fluid flowing through the strainer includes a two-chambered housing, each chamber containing a removable strainer basket. The strainer also includes a plurality of valve mechanisms for routing fluid flow through the two chambers in a predetermined manner. A user actuated directional flow control valve includes a multi-ported ball member rotatably supported by and between a pair of opposed valve seat plates, each associated with a respective one of the chambers wherein rotation of the ball directs fluid flow through it into one or the other or both of the chambers. An optional seal member, engageable with the ball, acts at a predetermined position of the ball member to block inlet fluid flow through any of the ports in the ball member thereby providing a shut off condition. A pair of spring biased, normally closed, check valves are used to automatically control the flow of strained fluid out of the strainer chambers.

Abstract: A filter for purifying drinkable and non-drinkable water is described, which comprises a body (1) for association with a water inlet and defining an inlet end (2) in communication with a purifying filter including sequentially a bacteria hold-back membrane (23) and an active carbon zone (31), and deflector means (40-74) which may be positioned in a first position, where the inlet end (2) is in communication with a direct water dispensing conduit (41-71) by bypassing the purifying filter, and in a second position, where the communication between the inlet end (2) and the direct water dispensing conduit is cut off and where the dispensing through a purified water conduit (42-71) is allowed.

Abstract: A water filter connects into a waterline which feeds a faucet separate from the filter. A filter cartridge is seated within a canister and has an inlet and an outlet. The canister is removably attached to a cap in which is disposed an entrance port to communicate with the outlet and an exit port to communicate with the inlet. Also in the cap are an input port for receiving water from the line, an output port for delivering water into the line to feed the faucet, a passage which communicates between the input port and the exit port, a passageway which communicates between the input port and the output port and a channel which communicates between the entrance port and the output port. A diverter in the cap responds to a rate of water flow from the faucet of less than a predetermined amount for opening the passage and the channel and closing the passageway, while being responsive to a rate of flow greater than such amount for closing the passage and the channel but opening the passageway.

Abstract: A filtering system for potable water has a stand and a basket-shaped filter for filtering potable water. The stand has an upper cantilevered branch with an opening sized to hold said filter. This filter is detachably mounted in the opening.

Abstract: A polymer filtration system comprises plural passages each having therein a filter selectively removable for cleaning and replacement. A single valve controls the closing off of the passages from an inlet to the filters, and check valves in each of the passages downstream of the filters prevent backflow. By adapting the system to permit simultaneous flow in plural passages between filter changes, the filters may be changed in staggered sequence at intervals chosen to attain optimum system performance.

Abstract: A water filter for use in connection with a replaceable cartridge is disclosed. The cartridge filter has four stages, and a housing for the cartridge filter has a base in which the cartridge filter is mounted on a water-flow-control section extending from the base. The water-flow-control section includes a linearly slidable plunger that directs water either toward or away from the cartridge filter by means of a rotatable lever connected to a slot in the plunger.

Abstract: A duplex strainer having a housing with an inlet port and a outlet port. st and second strainer chambers each have first and second ports which are in separate fluid communication with the housing. An efficient scotch yoke design coverts rotation of a first shaft into reciprocal lateral displacement of first and second disk assemblies to permit either the first or second strainer chambers to be closed off to flow while the other of the first and second strainer chambers remain open to flow.

Abstract: A method for separating fructose from glucose in mixture containing both sugars is disclosed, wherein the separation is carried out with anion-exchange resins in bisulfite form in a 3-column-system which is fed continuously from bottom to top. The process permits the simultaneous collection of both glucose and fructose which are separated in have a minimum dilution, the chromatographic bed being wholly expolited, thus making the instant process economically interesting.

Abstract: The invention relates to a process for continuous separation of mixtures of sugars and/or polyols. The mixture is fed to an installation comprised of at least 3 adsorbent filled columns connected in series. The columns represent absorption, enrichment and desorption zones respectively. The process provides for the continuous sequential operation of the columns as absorption, enrichment and desorption zones.

Abstract: A duplex cam-operated pressure-balanced sleeve valve is provided for controlling fluid flow into either one or both of two fluid lines, such as to either one or both of two filter elements, comprising, in combination;(1) a valve housing;(2) first and second valve chambers in the housing in alignment with a cam chamber therebetween;(3) first, second, and third fluid flow ports in the housing communicating with the first valve chamber, and fourth, fifth, and sixth fluid flow ports in the housing communicating with the second valve chamber;(4) a first reciprocable sleeve valve member in the first valve chamber, axially movable within the first valve chamber between positions controlling flow from the first fluid port to one or both of the second and third fluid flow ports;(5) a second reciprocable sleeve valve member, preferably coaxial with the first sleeve valve member, in the second valve chamber axially movable within the second valve chamber with the first sleeve valve member between positions controlling f

Abstract: A filter assembly having bypass valves to allow continued liquid flow during the removal and reinsertion of a new filter. The assembly includes a cylindrical filter housing threadedly mounted to a valve housing with a cylindrical filter removably mounted within the filter housing. The valve housing has an inlet connectable to a source of liquid. A first valve is rotatable from a filter position directing all liquid flow from the inlet to the filter to a bypass position directing all liquid flow from the inlet to the outlet of the assembly. A shut off valve prevents liquid flow into the filter when the first valve is in the bypass position.

Abstract: A process for separating a ketose from a feed mixture comprising a ketose and an aldose which process comprises contacting the mixture with an adsorbent comprising a X zeolite containing one or more selected cations at exchangeable cationic sites thereby selectively adsorbing a ketose from the feed mixture and thereafter recovering the ketose. Preferably, the ketose will be recovered by desorption from the adsorbent with a desorbent material.

Abstract: A water dispenser provided with a synchronous supply water valve system to control the simultaneous flow of water into and from the dispenser and further provided with a water purifier and an ultraviolet tank to provide purified and sterilized water for use.

Abstract: A valve assembly for a fluid filter includes a rotatable valve spindle movable with respect to the value housing and having first and second channels communicating with the filter, the channels also communicating with first and second bores of the housing when the spindle is in a first position in which fluid flows through the filter. The valve spindle further includes a third channel to provide a bypass around the fluid filter when the spindle has been rotated to a second position. The valve spindle also includes seal means for sealing the first and second bores when in the second or filter bypass position, which means includes a pair of chambers arranged to be aligned with the bores and a seal member within each chamber arranged to seal the respective bores. Each seal member has an aperture providing communication between its chamber and its respective bore to allow fluid to enter and charge the chambers for forcing the seal members against the bores in fluid tight sealing engagement therewith.

Abstract: The invention relates to a control device for the feeding and drainage of a column or a treatment station such as a demineralization station.The device includes a centralized distribution valve mounted on top of the column; which is equipped with at least three inner chambers having movable pistons adapted to connect various ports which the valve contains. The valve is connected with driving means, e.g., a hydraulic dispenser adapted to generate the shifting of the movable pistons for the purpose of positioning them in several specific positions.The device of the invention can especially be used in conjunction with demineralization columns containing ion exchanging resins. The device makes it possible to initiate and progress through the various operating phases or modes either automatically or semi-automatically.

Abstract: An extraction apparatus for extraction analysis of solid material is described, which consists of an extraction column mounted on a frame and a tubular filter holder mounted on the frame beneath the column. The holder is movable in the frame into and out of engagement with the lower end of the column.A multi-port valve is connectable to the lower end of the holder for supply of extraction liquid and flushing liquid to the column through the filter and for withdrawal of extraction liquid and flushing liquid from the column through the filter. The filter holder is removable from the frame for analysis of the solid material remaining after the extraction.

Abstract: A water purification device includes a housing having a base portion and a generally-cylindrical cup-shaped cap removably secured thereto. An input fluid channel in the base portion communicates with one end of the chamber defined by the cup and an outlet fluid channel communicates with that chamber end. A filter cartridge disposed within the cap has a conduit that extends between its opposite end walls. Filter material surrounds the conduit. An inlet opening in the cartridge is positioned to communicate with the input fluid channel so as to permit water to flow through the filter material. An outlet opening in the cartridge is arranged to communicate from the filter material to the other end of the aforementioned conduit remote from said outlet channel. The conduit other end is positioned to communicate to the outlet channel. A valve is included in an extension of the base portion in order selectively to control the distribution of water as between an outlet passage and the inlet channel.

Abstract: A water filter apparatus includes a housing having a horizontally-disposed base unit. A coupling upstands from one end portion of the base unit and is attachable to a faucet for receiving a supply of water. An outlet is downwardly directed from the base unit to discharge water received through the coupling. Also disposed within the base unit is a valve that selectively permits the flow of water through the coupling and in discharge from the outlet. Upstanding from another portion of the base unit is an inverted cup-shaped cap. An input fluid channel within the base unit leads from the valve to the chamber defined by the cap, and the valve selectively permits the flow of water through the coupling into the input channel and from that into the chamber. A filter cartridge disposed within the cap has an inlet opening communicating water from the input channel to the filter material.

Abstract: A flow control valve for multicycle liquid treatment apparatus has a pair of rotatable, slotted circular discs at its opposite ends. Rotation of the discs causes the slots to be selectively aligned with various ports, passages, holes and channels so as to control the direction and duration of liquid flow during the different cycles of the apparatus.

Abstract: A filter device, particularly a dry filter device for refrigerant in cooling systems, comprises an inlet- and outlet-equipped housing having a chamber containing the filter, which chamber has a sealable aperture for allowing replacement of the filter in the chamber, and a valve having a valve body which in an operating position establishes communication between the inlet and the outlet via the chamber containing the filter and which in a service position establishes communication between the inlet and the outlet around the chamber containing the filter to allow replacement of the filter. The valve body has an evacuation position in addition to the two said positions, in which evacuation position said valve body seals the inlet and establishes communication between the chamber containing the filter and the outlet.