Multi-function masks are presented including: a mask body forming a chamber, where the mask body includes an inner surface, an outer surface, an edge portion, a first intake portion, a second intake portion, a third intake portion, and an exhaust outlet portion, where the first intake portion passes filtered ambient air, where the second intake portion passes filtered and vaporized air, and where the third intake portion passes any of a fluid or a pressurized gas; a flexible contact portion positioned along the edge portion of the mask body for tightly contacting the mask body to a face when worn; and a filter unit positioned along the outer surface of the mask body for providing filtered ambient air to the first and second intake portions and for filtering exhaust air from the exhaust outlet portion.

A valve arrangement (900) for generating a pulse of air (1100) to clean an air filter (125) of a pre-separator (120), the arrangement (900) comprising: a main valve closure body (950) arranged to seal a passage (951) between a high pressure (P2) side and a low pressure (P3) side of the valve arrangement (900), a control body (940), connected to the main valve closure body (950), such that a position of the main valve closure body (950) Is determined by a position of the control body (940), a control chamber (930), partially defined by the control body (940), whereby a volume of the control chamber (930) Is variable In relation to the position of the control body (940), and a control chamber valve (920) having an open state and a closed state for regulating a pressure (P1) In the control chamber, wherein the control chamber (930) Is fluidly connected to the low pressure (P3) side via a connecting channel (935) configured with a connecting channel aperture (936), wherein the control chamber valve (920) Is configured with an aperture larger than the connecting channel aperture (936) such that the control chamber valve (920) Is arranged to overcome the connecting channel (935), and wherein the state of the control chamber valve (920) Is determined by a trigger device (910, 980). The arrangement also comprises a resilient trigger membrane (980) arranged between the high-pressure (P2) side and the low pressure (P3) side wherein the state of the control chamber valve (920) is determined by the position of the resilient trigger membrane (980).

The present invention provides a multi-stage coalescing filter for separating coalesced liquid from an aerosol-containing gas stream. The multi-stage coalescing filter includes an end cap having a chamber formed within and a plurality of coaxial, nested, tubular filter elements supported upright on the end cap. Pairs of successive filter elements are spaced from each other such that the end cap between pairs of successive filter elements forms respective annular sumps for collection of coalesced liquid separated by the filter elements from the aerosol-containing gas stream as it passes radially through the nested filter elements. The chamber has one or more inlets in fluid communication with the or each sump for receiving the coalesced liquid from the sump, and further has one or more outlets for guiding the received coalesced liquid out of the filter. The chamber houses a porous element which is configured to saturate under contact with the received coalesced liquid so as to allow the received coalesced liquid to flow through the porous element to the outlet while simultaneously preventing the aerosol-containing gas stream from passing through the chamber to bypass the nested filter elements.

A filter device is provided with a filter housing and a filter element arranged in the filter housing. The filter element is provided with an annular filter medium body that has an inflow side. The filter housing has a dirt collecting region in flow communication with the inflow side of the annular filter medium body. The dirt collecting region has an annular circumferentially extending configuration. A flow-tight separation element is arranged at or adjacent to the annular filter medium body. The dirt collecting region adjoins the flow-tight separation element. An inflow region is positioned at the inflow side of the annular filter medium body and immediately adjoins the dirt collecting region. The dirt collecting region has a radial extension relative to a longitudinal axis of the annular filter medium body, and the radial extension of the dirt collecting region is larger than a radial extension of the inflow region.

A filter device for a vacuum cleaner having a turbine device for generating at least one first and one second main air flow through at least a portion of the vacuum cleaner having and a control unit. The filter device has a first chamber including a first filter element, a first outflow opening, a first inlet opening and a first pressure surge element dividing the first chamber into a first chamber first space and a first chamber second space and reversibly movable between a first pressure surge element first position and a first pressure surge element second position, and a second chamber including a second filter element, a second outflow opening, a second inlet opening and a second pressure surge element dividing the second chamber into a second chamber first space and a second chamber second space reversibly movable between a second pressure surge element first position and a second pressure surge element second position.

A filtration system comprises a housing and a shell housing removably coupled to the housing. A valve comprise a valve housing and a plunger. The plunger comprises a seal member structured to seal an opening in the valve housing. The plunger is axially movable between a closed position, in which the seal member seals the opening, and an open position, in which the seal member does not seal the opening, thereby permitting fluid to flow through the valve housing. A filter element comprises filter media and an endcap. The endcap comprises an alignment tab configured to rotationally secure the filter element with respect to the shell housing when the shell housing is received in the housing. The endcap comprise a valve interaction projection structured to transfer rotation of the filter element and the shell housing to the plunger during installation of the filter element.

A filter device for a vacuum cleaner, including a turbine device, for generating at least one first and one second main air flow through at least a portion of the vacuum cleaner, and a control unit. The filter device includes a first chamber including a first filter element, a first outflow opening, a first inlet opening and a first pressure surge element, which divides the first chamber into a first and a second space and is reversibly movable between a first and a second position, the first main air flow being able to flow into the first space of the first chamber through the first filter element and to flow back out through the first outflow opening, a second chamber including a second filter element, a second outflow opening, a second inlet opening and a second pressure surge element, which divides the second chamber into a first and a second space and is reversibly movable between a first and a second position, the second main air flow being able to flow into the first space of the second chamber through the second filter element and to flow back out through the second outflow opening. The first pressure surge element and the second pressure surge element alternately are reversibly movable to alternately clean the first and second filters.

A flush valve, a dust collector provided with such a flush valve and a dust collection system, are disclosed. The flush valve includes a valve body and a valve spool. The valve body is internally provided with a fluid passageway. The valve body is provided with an inlet, a first outlet and a second outlet. The first outlet is fluidly connected to a device to be flushed. The valve spool includes a movable part, a fixed part and an elastic part, the fixed part being provided in the valve body, and the elastic part elastically connecting said fixed part to the movable part. One end of the movable part being provided with a first spool land for blocking the first outlet. The first spool land being configured to be pushed away from said first outlet by fluid in the fluid passageway when the pressure drops due to blockage.

An air treatment system is described, for a closable room of a vehicle, comprising: an air conditioning device provided with a fan and connectable to the room; an inlet opening for outside air, connected to the air conditioning device; a filtration device for filtering the outside air entering from the inlet opening; a recirculation port; a valve assembly provided with a shutter member, interposed between the inlet opening, the recirculation port and the air conditioning device and movable between a plurality of operating positions, in which it varies the shares of air coming from the inlet opening and the recirculation port; and a control unit to adjust the operating position of the shutter member so as to control the shares of air being drawn from the inlet opening and from the recirculation port and to maintain a predetermined value of overpressure in the room with respect to the outside.

The present disclosure relates to a dust container arrangement (15, 120, 210) adapted to be fluidly coupled to a fan arrangement (13) comprised in a power tool (1) via an at least partly flexible dust conduit (14). The dust container arrangement (15, 120, 210) comprises a frame (100, 126) which in turn comprises a holder part (102, 123) with a container inlet (101, 125). The dust container arrangement (15, 120, 210) further comprises a first container (107, 121) and a second container (108), which containers (107, 108; 121) are releasably attached to the holder part (102, 123) in a sealed manner. The first container (107, 121) is air-permeable such that air (A1) that is blown into the container inlet (101, 125) is permitted to escape through a wall (115 132) of the first container (107, 121), while the second container (108) is air-tight during operation and adapted to receive dust (113A, 113B, 113C) that is brought into the container inlet (101, 125).