Abstract: A robotic cleaner includes a housing, a suction conduit with an opening, and a leading roller mounted in front of a brush roll. An inter-roller air passageway may be defined between the leading roller and the brush roll wherein the lower portion of the leading roller is exposed to a flow path to the suction conduit and an upper portion of the leading roller is outside of the flow path. Optionally, a combing unit includes a plurality of combing protrusions extending into the leading roller and having leading edges not aligned with a center of the leading roller. Optionally, a sealing strip is located along a rear side of the opening and along a portion of left and right sides of the opening. The underside may define side edge vacuum passageways extending from the sides of the housing partially between the leading roller and the sealing strip towards the opening.

Abstract: Methods and Apparatuses for steam cleaning comprise a steam cleaning device/system employed for steam cleaning or treating operations. In an embodiment, a steam cleaning device may comprise agitation features employed for steam cleaning or treating. In another embodiment, the steam cleaning device may be a steam accessory employed for steam cleaning or treating. In yet another embodiment, the steam cleaning device may comprise various features employed for multi-purpose steam cleaning or treating.

Abstract: A valve for limiting differential pressure applied to a downhole tool includes a housing and a movable piston/mandrel assembly therein. In a closed position, drilling mud or other fluid may be communicated through a central bore of the valve to the tool. When the differential pressure between the central bore and the wellbore exceeds a first predetermined value, the piston/mandrel assembly moves from a first position obstructing one or more relief ports to a second position not obstructing them, thereby providing a fluid path from the central bore of the valve to the wellbore bypassing the tool and relieving the differential pressure thereacross. When the differential pressure decreases to less than another preselected value, the piston/mandrel assembly returns to its original position again obstructing the relief ports. A trigger mechanism is provided to allow more precise control and separation of the preselected differential pressure values.

Abstract: A surface cleaning head includes dual rotating agitators (e.g., a leading roller and a brush roll) and a removable cover for covering a top of the agitators and allowing access to the agitators from a top of the surface cleaning head. The dual agitators may be used to facilitate capturing of debris in the air flow into a suction conduit on the underside of the surface cleaning head. The brush roll may be located in a brush roll chamber and at least partially in an opening to the suction conduit. The leading roller may be positioned adjacent to and in advance of the suction conduit opening such that the leading roller engages debris and moves the debris toward the brush roll and the opening. The leading roller may be removable from the housing and held in place by the removable cover. The cover may be coupled using isolated latching mechanisms.

Abstract: A surface cleaning head with dual rotating agitators (e.g., a leading roller and a brush roll) may be used to facilitate capturing of debris in the air flow into a suction conduit on the underside of the surface cleaning head. The leading roller is generally positioned adjacent to and in advance of the opening of the suction conduit. The rotating brush roll may be located in the suction conduit with the leading roller located in front of and spaced from the brush roll, forming an inter-roller air passageway therebetween. The leading roller may provide a softer cleaning element than the brush roll and may also have an outside diameter that is less than the outside diameter of the brush roll. The surface cleaning head may also include debriding protrusions contacting the leading roller and/or a leading bumper that extends in front of the leading roller.

Abstract: A closure (10) for use with a beverage keg (20) is disclosed. The closure (10) comprises an inlet, a barrier (1) and a housing (2) that defines a venting hole (11). The barrier (1) seals the venting hole (11). The closure (10) comprises an unvented configuration in which a keg to which the closure is fitted can be pressurized. The closure (10) also comprises a vented configuration in which the barrier (1) is unsealed from the venting hole (11) to permit depressurization of the keg (20).

Abstract: Vacuum cleaning devices include foldable wands to provide a storage configuration and/or facilitate use. A vacuum cleaning device includes a wand having a first end coupled to a vacuum unit and a second end coupled to a vacuum head or surface cleaning head. The wand defines an air passage allowing air to pass from the surface cleaning head to the vacuum unit and includes a flexible air passage along at least a portion of the wand. The wand also includes a plurality of segments pivotably connected together such that the wand is foldable about 180° in a forward direction until the vacuum unit is positioned proximate a top of the surface cleaning head, thereby providing a storage configuration.

Abstract: Methods and Apparatuses for steam cleaning comprise a steam cleaning device/system employed for steam cleaning or treating operations. In an embodiment, a steam cleaning device may comprise agitation features employed for steam cleaning or treating. In another embodiment, the steam cleaning device may be a steam accessory employed for steam cleaning or treating. In yet another embodiment, the steam cleaning device may comprise various features employed for multi-purpose steam cleaning or treating.

Abstract: A closure (10) for use with a beverage keg (20) is disclosed. The closure (10) comprises an inlet, a barrier (1) and a housing (2) that defines a venting hole (11). The barrier (1) seals the venting hole (11). The closure (10) comprises an unvented configuration in which a keg to which the closure is fitted can be pressurised. The closure (10) also comprises a vented configuration in which the barrier (1) is unsealed from the venting hole (11) to permit depressurisation of the keg (20).

Abstract: A valve for limiting differential pressure applied to a downhole tool includes a housing and a movable piston/mandrel assembly therein. In a closed position, drilling mud or other fluid may be communicated through a central bore of the valve to the tool. When the differential pressure between the central bore and the wellbore exceeds a first predetermined value, the piston/mandrel assembly moves from a first position obstructing one or more relief ports to a second position not obstructing them, thereby providing a fluid path from the central bore of the valve to the wellbore bypassing the tool and relieving the differential pressure thereacross. When the differential pressure decreases to less than another preselected value, the piston/mandrel assembly returns to its original position again obstructing the relief ports. A trigger mechanism is provided to allow more precise control and separation of the preselected differential pressure values.

Abstract: A cement handling system may include an aggregate container, a first component container, a second component container, and a metered water supply. The first component container may house a first mortar component and may include a metered opening in communication with the aggregate container. The second component container may be isolated from the first component container and may house a second mortar component. The second component container may include a second metered opening in communication with the aggregate container. The metered water supply may be in communication with the aggregate container.