A method for supplying compressed gas via an assembly (1) having a plurality of liquid-injected elements (6, 8) for compressing gas, wherein the method includes providing a first liquid connection between a first liquid circuit related to a first of the plurality of liquid-injected elements (6) and the second liquid circuit related to a second of the plurality of liquid-injected elements (8).

Disclosed is a germicidal device for air and for liquids, characterised in that it has five different operation modes, which comprises a series of particle-retaining filters (2, 14, 22, 25, 35) made of activated carbon and silver-ion fabric and through which a current of fluid passes at different pressures, propelled by motor-turbines (16, 17) towards labyrinth plates (5, 6). The plates surround a refrigeration compartment (9) containing emitters (7) of germicidal radiation, which refrigerate and purify gases such as ozone, preventing the consumption thereof and allowing same to be used as a germicidal reinforcement in the system. Purified air to be inhaled and exhaled air are carried through tubes (31, 32) between the device and a mask worn by the user, which are attached to the neck or head by means of retentive supports (37, 39, 40, 44, 45).

A handheld vacuum cleaner including a suction inlet, a main body, a handle defined by a portion of the main body, a motor disposed within the main body operating a suction source, and a filter coupled to the main body. The filter is configured to separate debris from a flow of fluid drawn through the suction inlet. The filter includes a housing forming a first volume and a filter media forming a second inner volume. The filter media is coupled to the housing such that the first and second inner volumes together at least partially define a collection container configured to store debris separated by the filter media from the flow of fluid. The filter further includes an inlet opening that extends through the housing to provide fluid communication into the collection container such that the flow of fluid with the debris can flow into the collection container such that the flow of fluid with the debris can flow into the collection container and a relatively clean flow of fluid exits through the filter media.

A filter configured to separate debris from a flow of fluid. The filter includes a housing and a filter media coupled to the housing to form a collection container. The collection container is configured to store debris separated by the filter media from a flow of fluid. The filter further includes an inlet opening that extends through the housing to provide fluid communication into the collection container such that the flow of fluid with the debris can flow into the collection container and a relatively clean flow of fluid exits through the filter media. The filter further includes an attachment member that couples the filter media to the housing.

An apparatus and methods for air filtration are disclosed. The apparatus includes a body and first and second replaceable filters. The body of the apparatus further contains an air-exchange assembly and a filter receiver attached to the air exchange assembly. The air-exchange assembly contains an exhaust tube with an open end and a closed end, two wings on opposite sides of the exhaust tube, and an intake check valve and an exhaust check valve inside the exhaust tube. The first replaceable filter surrounds the filter receiver; and the second replaceable filter is inside the filter receiver. Several apertures and the check valves are strategically disposed in the exhaust tube to achieve optimal air filtration and avoid contamination of a user's exhaust.

A filtration system comprises a filter head assembly comprising an outlet slot, valve element, and latch element. The valve element is in fluid communication with the outlet slot and includes an open position and a closed position. In the open position fluid flow travels through the outlet slot. In the closed position fluid flow is prevented through the outlet slot. The latch element is configured to lock the valve element in the closed position. The filtration further comprises a filter cartridge structured to engage the filter head assembly. The filter cartridge comprises a first and second filter end. The filter cartridge comprises filter media and a keyed element disposed on the first filter end. The keyed element is structured for engagement of the latch element, wherein the engagement unlocks the valve element causing the valve element to be in the open position.

A filter has a filter cup, a filter element arranged in the filter cup, and a filter head. Filter cup and filter head are connected by a releasable bayonet-type connection with interacting locking parts connected to filter cup and filter head. A locking nose on the first locking part and a recess on the second locking part interact. The recess has an insertion/removal region for joining and separating locking nose and recess and also a locking region for hooking the locking nose. A spring between filter cup and filter head generates pretension on the locking nose in the recess. The recess has a locking shoulder with a shoulder tip between locking region and insertion/removal region. The locking nose has a locking tip. When locking tip and shoulder tip contact each other, the locking nose is forced by the spring into the locking region or into the insertion/removal region.

Implementations disclosed herein provide a compact downdraft table system comprising a vertically oriented cylindrical filter cartridge located below a work surface in a main housing of the downdraft table, a purge assembly in the main housing vertically aligned with the filter cartridge that discharges purged air to an interior of the filter cartridge to purge particulates collected on an exterior of the filter cartridge, and a self-closing louvre in the main housing that permits air flow from the work surface, through the louvre, and through the filter assembly in a first direction, and prevents purged air flow from flowing through the louvre to the work surface in a second direction opposite the first direction.

Implementations disclosed herein provide a compact downdraft table comprising a spark arrestor oriented below a work surface, a vertically oriented cylindrical filter cartridge located below the work surface, a fan assembly that draws air through the work surface, the spark arrestor, and the filter cartridge and exhausts filtered air out of the downdraft table, a purge assembly that discharges purged air to an interior of the filter cartridge to purge particulates collected on an exterior of the filter cartridge, wherein the spark arrestor, filter cartridge, fan assembly, and purge assembly are all contained within a main housing for the downdraft table.

Embodiments of air admittance valve assembly and piping system incorporating the same are provided herein. In some embodiments, a valve assembly comprising a housing, a first valve comprising a first valve sealing member and a first valve seat, and a second valve comprising a second valve sealing member and a second valve seat, and a pipe, an inlet, an outlet, a first zone, a second zone, a third zone, the first and second valve sealing member is closed by gravity and open based upon the pressure differential between the first zone, second zone and third zone.