Abstract: A filtration device that includes a pressure vessel having an inlet and an outlet, the filtration device configured to filter a pressurized fluid stream. In an embodiment, the filtration device has at least one disk-shaped filter element housed within the pressure vessel arranged to filter fluid flowing from the inlet to the outlet, and an inlet flow tube disposed within the pressure vessel proximate the inlet tube, wherein the inlet flow tube is configured to direct the pressurized fluid stream from the inlet tube towards a central portion of the at least one disk-shaped filter element.

Abstract: The invention relates to a method for cleaning the filters of a vacuum cleaner. A dirt collecting container of the vacuum cleaner has a suction inlet and is in flow connection with at least one suction unit via at least one filter and at least one suction extraction line. At least one external air inlet is provided which opens into the suction extraction line downstream of the filter and can be closed by a closing valve. The closing valve has a movable valve body which is acted upon by a closing spring with a closing force. In order to clean the filter, the closing valve is opened and the side of the filter that is oriented away from the dirt collecting container is impinged upon by external air. The valve body is acted upon, irrespective of its position, by the closing force of the closing spring and, in a position at a distance from the valve seat, additionally acted upon by a repulsion force of a resilient stop element.

Abstract: An inertial gas-liquid separator and method is provided, including variable orifice jet nozzle structure having a variable orifice area dependent upon axial movement of a plunger relative to a housing sleeve, and in another embodiment having first and second flow branches, with the first flow branch being continuously open, and the second flow branch having a variable flow controller controlling flow therethrough.

Abstract: Methods, techniques, and constructions are provided for use to apply an evacuation valve arrangement on an air cleaner assembly that is configured for pulse jet operation. An example evacuation valve arrangement is provided which comprises a valve member in the form of a sleeve that extends completely around a sidewall portion of an air cleaner housing of a pulse jet air cleaner. Examples are depicted in which the sidewall portion can comprise: a portion of a housing sidewall section that surrounds an installed filter cartridge, in use; a portion of an access cover; or, a drop tube secured to a portion of the housing, for example either on an access cover or on another portion of a housing. Specific features and alternatives are described. Also, methods of assembly and operation are described.

Abstract: A filter assembly comprising a housing having an air inlet and an air outlet and a filter chamber disposed between the inlet and the outlet, the housing having an air flow path there through. A filter element having a first surface area maybe located within the filter chamber and oriented such that the first surface area is angled with respect to the air flow path. The filter element may comprise a filter media adapted to remove contaminants from the air. A drain may be associated with the housing and adapted to remove contaminants filtered out of the air.

Abstract: Embodiments of the invention generally provide a containment system having integrated bubble tight-dampers. In another embodiment, the containment system includes an integral auto-scan mechanism disposed in the housing of the containment system so that a filter element, disposed in the housing, may be leak tested without accessing the interior of the housing. In yet another embodiment, a method for testing a filter disposed in a containment system includes challenging an upstream side of a filter element disposed in a housing of the containment system with a test aerosol, and automatically moving a probe disposed within the housing to obtain samples for leak testing.

Abstract: An inertial gas-liquid impactor separator and method is provided, including multiple stages and multiple variable flow controllers.

Abstract: An air filter and fan device for a vehicle ventilation system is disclosed that, in direction of air flow, includes an air filter, an impeller, and a flow-off channel. A casing is provided that accommodates the impeller and the flow-off channel in an enclosing manner such that the impeller is established with double-suction, receiving air from the air filter from both a first side and a second side or the impeller.

Abstract: An air filter arrangement for an agricultural combine located on a panel at a side wall of the agricultural combine. The air filter arrangement includes a rotary filter mounted for rotation at a first aperture, a scoop enclosing the rotary filter and blocking substantially all air flow to the rotary filter except at a scoop inlet disposed along an upper edge of the scoop above the rotary filter, and at least one stationary filter disposed to filter air passing through a second aperture in the panel, the stationary filter being located between an upper portion of the rotary filter and the scoop inlet.

Abstract: An oil separator arrangement for an internal combustion engine incorporates a vortex chamber oil separator with a vortex chamber extending in a longitudinal direction, where the vortex chamber includes a wall extending in a longitudinal direction, a gas inlet, and a gas outlet opening. The gas inlet is disposed tangential to the wall for tangentially blowing-in of blow-by-gas into the vortex chamber, so that at least one gas vortex flow rotating helically along the wall in the longitudinal direction is generated, where at least one further oil separator is connected in parallel to the vortex chamber oil separator. The further oil separator incorporates a separation chamber with an inlet-side spring tongue automatically controlled by the applied blow-by-gas, and a baffle wall disposed downstream the spring tongue.

Abstract: The present invention provides a receptacle filter for charging hydrogen which can reliably remove impurities from hydrogen gas when charging hydrogen into a tank. The receptacle filter of the present invention includes a filtering unit which removes impurities from hydrogen gas, and a one-way control valve which controls the flow direction of hydrogen gas.

Abstract: A sorption column for waste-gas cleaning has a vat-shaped housing (1) for receiving a solid stationary sorbent, an inlet for waste gas to be cleaned into the housing (1) and an outlet for cleaned waste gas out of the housing (1). The housing circumferential wall (2) is provided in the area of the housing bottom (3) and the housing cover (4) in each case with a depression (9, 10) for receiving a ball valve (11) at the waste gas inlet or a ball valve (12) at the waste gas outlet.

Abstract: A gas-liquid separator assembly has dual flow first and second split partial paths. The first path is an impaction separation path effecting liquid particle separation from a gas-liquid stream by inertial impaction. The second path is a coalescence-separation path effecting liquid particle separation from the gas-liquid stream by coalescence.

Abstract: A cyclonic chamber for use in air filtration devices. The chamber includes an apex opposite a base with sidewalls extending therebetween. The cyclonic chamber is preferably parabolic in cross-section or tubular with a hemi-spherical cap. The base contains an outflow passage and a conical filter extending therefrom. An inflow passage is provided proximate the apex. The inflow and outflow passages are parallel but not aligned. The chamber interior is smooth. The smooth interior and offset relationship of the inflow and outflow passages causes air to take a cyclonic path between the inflow passage and the filter. Debris in the airstream is pushed outward—away from the filter—by centripetal force. Eddies form proximate the base. Debris escapes the airstream there, where it either remains or, depending upon the chamber's orientation relative to gravity, falls back into the airflow where it is again directed away from the filter.

Abstract: A filter assembly for use with compressor assemblies such as oxygen concentrators, ventilators and other breathing apparatus including a compartmented housing member having at least one inlet opening, an outlet opening, a filter member, and an adjustment member associated with the at least one outlet opening for varying the size of the at least one outlet opening for adjusting the amount of ambient air entering the filter assembly.

Abstract: An air inlet assembly for an automotive heating and ventilating air conditioning (HVAC) system includes a casing extending along an axis (A). The casing defines a plurality of inlets for receiving air and an outlet for delivering air from the inlets. A filter filters air between the inlets and the outlet. An air moving device disposed about the outlet for expelling air from the casing. A valve mechanism supports the filter. Furthermore, the valve mechanism moves along the axis (A) between an outside-air position and a cabin-air position for controlling air from the inlets to the outlet.

Abstract: An electric vacuum cleaner includes a first dust separation device configured to separate sucked dust, a first dust collection section for collecting the separated dust, a second dust separation device configured to separate the dust, a dust removing device configured to remove the dust adhering to the second dust separation device, a second dust collection section for accumulating the removed dust, a partition wall for zoning the first dust collection section and the second dust collection section and an introduction opening for introducing the removed dust into the second dust collection section; the partition wall includes a communication opening for communicating the first dust collection section to the second dust collection section and an opening and closing member for closing either of the introduction opening or the communication opening and switching the closing to the other by rotating, and the opening and closing member closes the introduction opening with a negative pressure by an electric fan and

Abstract: An in-line filter provided with a substantially elongated filter housing (1; 51) in which filtering material (A) is included, the filter housing being provided on a first end with an inflow opening (2) and, on a second, opposite end with an outflow opening (3), while at the inflow opening (2) and the outflow opening (3) fastening means (4-7) are provided for fastening a supply or discharge tube, respectively (8 or 9, respectively), while the fastening means (4-7) are quick-change couplings (4-7), a respective quick-change coupling (4, 5; 6, 7) having a coupled condition and an uncoupled condition, while in the quick-change coupling (4, 5; 6, 7) a shut-off valve (10) is provided which, in the coupled condition, assumes an open position thus allowing gas to pass and which, in an uncoupled condition, assumes a closed position thus not allowing gas to pass.

Abstract: A filter housing assembly having a gas-tight seal and a method of replacing a filter are generally provided. In one embodiment, the filter housing assembly includes a housing having an opening adapted to receive a filter and an inlet. A seal member is coupled to the housing and is moveable between a first position and at least a second position, the second position sealing the inlet. The filter housing assembly may be configured to retain a roomside replaceable filter or have a filter permanently adhered within the opening.

Abstract: A semiconductor manufacturing process facility requiring use therein of air exhaust for its operation, such facility including clean room and gray room components, with the clean room having at least one semiconductor manufacturing tool therein, and wherein air exhaust is flowed through a region of the clean room. The facility includes an air exhaust treatment apparatus arranged to (i) receive air exhaust after flow thereof through said region of said clean room, (ii) produce a treated air exhaust, and (iii) recirculate the treated air exhaust to an ambient air environment in the facility, e.g., to the gray room of the facility.

Abstract: The invention provides an air filter assembly including an air filter extending along a central axis from a first end to a second end. The air filter decreases in width along the central axis from the first end to the second end. The air filter assembly also includes a filter housing partially enclosing the air filter and defining an aperture adjacent to the second end. One or more airstreams can be directed through the aperture to the air filter. The air filter assembly also includes at least one valve member rotatable about a rotation axis. The valve member pivots around the second end to block at least a portion of the aperture.

Abstract: A sandwich filter device including a block body and an insert held in the block body. The insert and the block body each have a passage for gas flow through. Positioned across the insert passage is a filter for removing contaminants from a gas stream.

Abstract: A continuous pressure letdown system connected to a hopper decreases a pressure of a 2-phase (gas and solid) dusty gas stream flowing through the system. The system includes a discharge line for receiving the dusty gas from the hopper, a valve, a cascade nozzle assembly positioned downstream of the discharge line, a purge ring, an inert gas supply connected to the purge ring, an inert gas throttle, and a filter. The valve connects the hopper to the discharge line and controls introduction of the dusty gas stream into the discharge line. The purge ring is connected between the discharge line and the cascade nozzle assembly. The inert gas throttle controls a flow rate of an inert gas into the cascade nozzle assembly. The filter is connected downstream of the cascade nozzle assembly.

Abstract: A filtration unit for use with an environmental control unit (ECU), usually a portable ECU, which includes at least two air flow paths wherein at least one of the air flow paths allows for use of air which has not passed through a nuclear, biological, and chemical (NBC) filter and at least one other does. The filtration unit may have at least three air paths, at least two of which provide NBC filtered air. This filtration unit can provide for longer expected operational life before filter replacement is required in both contaminated and non-contaminated environments. Further, the filtration unit may include remote sensing and control apparatus allowing for quick switching between operational modes depending on the need for filtered vs. unfiltered air and for a decreased reliance on personnel for maintenance and control, and a more simplified setup.

Abstract: A filter housing assembly having a leak testable aerosol injection port is a conduit coupled to an aerosol injection selectively traps aerosol port of the filter housing assembly after disconnecting an aerosol generator used to challenge a filter installed in the housing assembly. The trapped aerosol provides a high concentration challenge that facilitates leak testing of the aerosol injection port after the aerosol generator has been removed.

Abstract: The present invention is an apparatus for containing and dispensing a high purity fluid comprising an outer vessel capable of containing a quantity of high purity fluid in its interior; an outlet associated with the outer vessel for dispensing the high purity fluid; a valve capable of controlling high purity fluid flow out of the outer vessel through the outlet; an inner vessel at least partly situated in the outer vessel and communicating with the outlet and an inlet which communicates with the interior of the outer vessel; a purification media contained within the inner vessel for purifying the high purity fluid of undesired components; and fluid flow control device which prevents high purity fluid from flowing from the inner vessel to the interior of the outer vessel.

Abstract: A separator tank assembly comprising a cast hollow tank and a cast lid. The cast hollow tank has a closed end and an open end having a first opening and a second opening. The cast lid has a first passage configured for fluid communication with the tank first opening and a second passage configured for sealed fluid communication with the second opening. The first passage is formed with an integral port configured to receive a pressure control valve and the second passage is formed with an integral port configured to receive an oil filter and wherein the tank is configured such that air having undergone primary separation flows through the first opening and oil within the tank flows through the second opening.

Abstract: A semiconductor manufacturing process facility requiring use therein of air exhaust for its operation, such facility including clean room and gray room components, with the clean room having at least one semiconductor manufacturing tool therein, and wherein air exhaust is flowed through a region of the clean room. The facility includes an air exhaust treatment apparatus arranged to (i) receive air exhaust after flow thereof through said region of said clean room, (ii) produce a treated air exhaust, and (iii) recirculate the treated air exhaust to an ambient air environment in the facility, e.g., to the gray room of the facility.

Abstract: A self-sealing protection filter port for gas masks prevents contamination of the inner-environment of the mask during exchange of filters and therefore increases safety. A biased valve closes the air inlet to the port when the protection filter is not installed. As a new filter is inserted, the valve is forced open, allowing filtered air to flow through the air inlet to the user. The protection filter engages the filter port using a retaining element. The self-sealing protection filter in a protection mask having an internal close-biased valve is installed in the standard protection filter port of the mask.

Abstract: An air dryer assembly for removing moisture and oil from a compressed air system includes a desiccant material received in a shell for adsorbing moisture as compressed air passes therethrough. A coalescing element is disposed between an inlet and outlet for removing oil aerosols from the compressed air. A check valve is disposed in parallel with the coalescing element and forces the compressed air to pass through the coalescing element as air flows from the inlet to the outlet. During a purge or reverse flow, compressed air bypasses the coalescing element and removes oil collected in the cartridge through the inlet.

Abstract: This filter-drier for removing moisture from a refrigerant includes a casing having an inlet for receiving refrigerant, an outlet for discharging and a molded core disposed in the casing between inlet and outlet. In one embodiment, the core includes an outer surface in part engaging the inner surface of the casing. Axial movement of the core is prevented by bonding with the casing or by an indentation protruding into the core or both. Another embodiment-includes a filter media pad bonded to the core sufficiently to hold the pad in place eliminating the need for outlet support screens. In another embodiment suitable for reversible operation in a heat pump system, the filter-drier includes a hollow cylindrical core having a filter media bonded to the core and defining a filter media lined passage, the core being held in place by end plates having opposed axial check valves and offset check valves.

Abstract: A quick-change filter system provided with at least one base and at least one quick-change filter, which base is provided with a filter coupling part provided with a gas inlet stub for connection to an inlet of the quick-change filter and with a gas outlet stub for connection to an outlet of the quick-change filter, the quick-change filter being provided with a filter housing, which is at least partly filled with filter material and to which the inlet and the outlet are connected, and with a quick-change coupling arranged for cooperation with the filter coupling part of the base, the quick-change coupling containing the inlet and the outlet of the quick-change filter, the base being provided with means for manually connecting the quick-change filter to the base, and being provided with sealing means for automatic, gastight sealing of the gas outlet stub and the gas inlet stub when decoupling the quick-change filter from the base.

Abstract: A dehydrator breather is provided that includes a vessel, a desiccant container, a valve housing coupled to the vessel, and a vent assembly coupled to the valve housing. The vent assembly includes screened ports disposed along a vertical axis of the vent assembly body that allow air to enter and exit the dehydrator breather. The vent assembly, along with a filter placed between a desiccant container and the valve housing, individually and jointly, prevent desiccant that escapes the desiccant container from clogging the valve assembly.

Abstract: An exhaust system for a diesel engine which includes a particulate filter for filtering a flow of engine exhaust gas includes, as part of the exhaust system, a catch basin for the collection of oxidation by-products from the particulate filter. Important in the design is to orient the particulate filter in a generally vertical orientation based upon the normal orientation of the diesel engine when in use. By vibration of the engine due in part to engine operation and due in part to vehicle vibrations, oxidation by-products shake loose from the particulate filter and fall through a connecting conduit. By positioning the catch basin below the particulate filter and connecting it to the conduit, the oxidation by-products are able to be collected in the catch basin for removal at a later time.

Abstract: An integrated sampling device with liquid eliminator is provided. The device includes a body with integrated valving. A liquid eliminator device is provided within the body and interposed in a flow path such that gas will pass through and liquid will not. The gas will then be conducted to a sampling device while the liquid will pass through an exhaust port back to the source of fluid. An inlet valve is also provided to control the flow of fluid from the source to the liquid eliminator element. An outlet valve may be provided to control liquid back to the source.

Abstract: A vehicle air cleaner system 10 includes a cyclone chamber 14 and a variable inlet 30. The variable inlet 30 communicates airflow to the cyclone chamber 14 at a relatively constant velocity by varying an opening 32 in response to airflow which enters the inlet 12. During a relatively low airflow condition the variable inlet 30 directs airflow closer to a center of the cyclone chamber 14 which increase the angular velocity of the airflow by directing airflow toward smaller radii 42s within the cyclone chamber. During a relatively high airflow condition the variable inlet directs airflow toward the outer diameter of the cyclone chamber 14 and larger radii 42 L to assure an angular speed sufficient to separate out undesirable particles yet prevent an undesirable pressure drop across the air cleaner system 10. By varying communication of airflow to particular radii within the cyclone chamber 14, a relatively constant pressure drop across the air cleaner system 10 is provided regardless of airflow velocity.

Abstract: A vehicle air cleaner system 10 includes a cyclone chamber 14 and a variable inlet 30. The variable inlet 30 communicates airflow to the cyclone chamber 14 at a relatively constant velocity by varying an opening 32 in response to airflow which enters the inlet 12. During a relatively low airflow condition the variable inlet 30 directs airflow closer to a center of the cyclone chamber 14 which increase the angular velocity of the airflow by directing airflow toward smaller radii 42s within the cyclone chamber. During a relatively high airflow condition the variable inlet directs airflow toward the outer diameter of the cyclone chamber 14 and larger radii 42 L to assure an angular speed sufficient to separate out undesirable particles yet prevent an undesirable pressure drop across the air cleaner system 10. By varying communication of airflow to particular radii within the cyclone chamber 14, a relatively constant pressure drop across the air cleaner system 10 is provided regardless of airflow velocity.

Abstract: An air cleaner intake door is provided. An air cleaner with at least one sidewall and an opening defined in the sidewall has a door mounted over the opening. The door is rotationally movable between an open and a closed position and a cam extends from the door. A spring is in contact with the door for biasing the door towards a closed position.

Abstract: A filter-cleaning device and method for cleaning a filter (10) utilizing a compressible fluid pulse generator (20) including a pressure tank (21), a tank inlet (23) for inletting pressurized air or other compressible fluid, and a valve member (24) normally in a closed position closing the tank outlet (28), but being openable in a quick-action manner to produce a high-pressure high-flow impulse of fluid applied via the tank outlet to the filter outlet to back-flush the filter.

Abstract: A valve assembly for a vapor canister includes a partition adapted to be disposed in an interior chamber of the vapor canister and having at least one opening extending therethrough. The valve assembly also includes a valve connected to the partition and covering the at least one opening and being movable to provide variable flow of fluid therethrough.

Abstract: A cyclone is provided above a liquid receptacle (4) in a housing (1,3) whose interior is at reduced pressure in operation. Liquid and solid particles carried by the incoming stream of air accumulate in the cyclone (18) and circulate as a body of solid-laden liquid while coming repeatedly into contact with the incoming stream. Excess solid-laden liquid flows down into the receptacle (4) from the cyclone (18) through a lower outlet (23a). The air leaves the cyclone substantially freed from liquid droplets and solid particles.

Abstract: A steam humidification apparatus includes a dispersion tube having a jacket defining a jacket area. The steam humidification apparatus includes a steam line for supplying steam to the jacket. The steam humidification apparatus includes a valve having a seat, the valve being positioned to deliver dry steam to the dispersion tube. The steam humidification apparatus includes a separator in communication with the valve, the separator being mounted to receive steam and to deliver dry steam to the valve. The separator, the valve, and the dispersion tube are all positioned generally coaxial.

Abstract: A separator for separating entrained particles from a fluid flow incorporates a cyclone chamber having an outer wall and a cyclonic flow region; a fluid inlet for introducing a cyclonic fluid flow to the cyclonic flow region; a fluid outlet for removing the fluid flow from the cyclone chamber; a particle separation member positioned in the cyclone chamber beneath at least a portion of the cyclonic flow region, the particle separation member having an upper surface and plurality of apertures; and a particle receiving chamber disposed beneath the particle separation member for receiving particles passing into the particle receiving chamber through the apertures. In operation, a fluid is introduced to flow cyclonically in a chamber having a cyclonic flow region and a particle separation member positioned in the cyclone chamber to define a particle receiving chamber. The back pressure in the chamber is adjusted to promote the formation of a laminar boundary layer adjacent the particle separation member.

Abstract: A filter arrangement for use with a vessel containing pressurized fluid includes a body engageable with the vessel. The arrangement further includes a coalescing filter assembly supported by the body such that the filter assembly is disposable inside the vessel when the body is engaged with the vessel. In one embodiment of the filter arrangement, the coalescing filter assembly includes a housing having a cavity, a coalescing filter disposed in the cavity for removing entrained liquid from the fluid, and a drain device in fluid communication with the cavity for draining the liquid removed by the coalescing filter from the cavity into the vessel.

Abstract: An air filter for an internal combustion engine having a housing (10) and a filter element (11) which is arranged in the housing. The housing (10) is provided with a filtered air outlet (15) and at least one untreated air inlet (16) with a screen (17) or a closable flap. An auxiliary untreated air inlet (18) which is closed by a flap valve (19) is also provided. The screen (17) or the flap of the untreated air inlet (16) opens when the temperature of the untreated air is above a certain threshold value and closes when the temperature of the untreated air is below a certain threshold value.

Abstract: A residual gas removing device for a gas supply apparatus in a semiconductor fabricating facility, includes a low stress valve disposed between a mass flow controller and a chamber. The low stress valve alternately supplies or cuts off a gas from the mass flow controller to the chamber. A WF6 gas removing apparatus is in flow communication with a gas inlet line of the low stress valve to remove a residual WF6 gas in the gas inlet line, before proceeding with a subsequent deposition step.

Abstract: A method of diverting flow with a valve through a first filter and a second filter to purify exhaust gas with at least one of the filters and to regenerate at least one of the filters with the exhaust gas. Positioning the valve in a first operative position purifies the exhaust gas with the first filter and regenerates the second filter with the exhaust gas. Positioning the valve in a second operative position that is different that the first operative position purifies the exhaust gas with the second filter and regenerates the first filter with the exhaust gas. The method can be achieved by a valve for an exhaust system that including a body and a flow inhibitor. The body defines a volume and has a first inlet, a second inlet, a recirculation chamber, and an outlet chamber in fluid communication with the volume.

Abstract: A filter apparatus is connected to an outlet portion of a canister mounted on a fuel supply system for a vehicle. A housing and a filter element are provided. The housing has a connection-opening portion connected to the outlet portion and atmospheric release opening portion communicating with the atmosphere. The filter element includes a frame which surrounds a filter body and is joined over its entire periphery to an inner wall of the housing, dividing an interior of the housing into a clean-side and dirty-side zone. The frame includes only one one-way valve, which allows fluid flow only from the clean-side zone to the dirty-side zone, bypassing the filter element. The filter apparatus is arranged so that fluid entering the housing by the connection-opening portion may pass through the filter element and exit by the atmospheric release opening portion.

Abstract: The system and method for molecular contamination control permits purging a SMIF pod to desired levels of relative humidity, oxygen, or particulates. The SMIF pod includes an inlet port including a check valve and filter assembly for supplying a clean, dry gaseous working fluid to maintain low levels of moisture, oxygen, and particulate content around materials contained in the SMIF pod. The SMIF pod outlet port, which also includes a check valve and filter assembly, is connected with an evacuation system. Flow of purge gas inside the SMIF pod can be directed with one or more nozzle towers to encourage laminar flow inside the pod, and one or more outlet towers, having a function similar to that of the inlet tower, may also be provided. The purge gas can be dried by exposure to a desiccant, heated to temperatures between about 100° C. and about 120° C., and can be tested for baseline constituent levels prior to or after introduction into a SMIF pod.

Abstract: A vacuum receiver for separating particles entrained in a gas-particle stream and for allowing a gas stream to exit from the vacuum receiver to an exhaust blower while simultaneously allowing the particles to remain in a particle receiving vessel having an open top. A cover is provided which has a top wall with a perimeter thereof resting on a surface of the receiving vessel encircling the open top. The cover has two openings therethrough, the first opening being oriented directly above the particle receiving vessel and a second opening being oriented on an axis that is wholly outside a peripheral boundary of the particle receiving vessel. The cover further includes a structure defining a passageway extending from the particle receiving vessel to the aforesaid second opening. A reciprocal valve member is mounted in the passageway and a drive motor is provided therefor which is mounted on an exterior part of the passageway to facilitate easy access thereto.