A backflow preventer for water filtering equipment, the water filtering equipment has a plurality of filtering units, the filtering units are connected among each other via at a plurality of connectors connected by at least one hose and connected to a water source via the at least one of the connectors, at least one of the connectors has a check valve set, and the check valve set has a check valve and an unidirectional valve. The check valve has an elastic tube with a duckbill valve at one end and is connected to a base at another end, and the base has a socket sleeved onto the elastic tube. The unidirectional valve has a first main portion with a larger diameter and a second main portion with a smaller diameter, the diameter of the second main portion corresponding to an inner diameter of the socket of the check valve.

A diffusion system comprising an upper unit and a lower unit. The upper unit comprises a series of tubing that is situated so as to effectuate collision of the fluid and air molecules. The upper unit uses vortex winding and unwinding and pressure gradients to avoid gas and liquid separation to accomplish successful collisions between a gas and a liquid. The lower unit comprises a filtering system, liquid intake system, air intake system, and submersible liquid transportation system.

The invention relates to a drinking water supply system including a drinking water line system, a plurality of drinking water withdrawal points connected to the drinking water line system, at least one sensor which is designed to determine measuring values, a central control device which is designed to receive and evaluate the measuring values determined by the at least one sensor, a plurality of decentralized control elements which are designed to influence at different locations in the drinking water supply system one or more properties of the water guided in the drinking water supply system, wherein the central control device is designed to control the control elements for influencing the one or more properties of the water guided in the drinking water supply system, and wherein a plurality of control elements are or can be combined to form a virtual group.

An installation structure of an external filter case for a refrigerator is provided. The filter case may include a main body that provides an inner space in which an internal line may be installed and water filters may be installed, and a cover that covers the inner space of the main body and is detachably coupled with the main body. The main body may have an open front side and may include bosses that protrude from its bottom face. The cover may include insertion holes into which the bosses may be inserted. A lower portion of the main body may be coupled with a lower portion of the cover. Magnets may be installed in upper portions of the main body and the cover, respectively, such that the main body and the cover may be coupled with each other by a magnetic force.

A plumbing fitting includes a housing and a missing valve. The housing includes a first aperture, a second aperture, a third aperture, and a mixing chamber in fluid communication with the first aperture, the second aperture, and the third aperture. The mixing valve is disposed within the housing. The mixing valve includes a first flow control valve that is configured to control a first flow of fluid from the first aperture to the mixing chamber.

The invention is configured for water-supply and comprises the vertically oriented hydraulic accumulator; the inlet and outlet connections; the connected to the hydraulic accumulator filter with the removable cartridge, located in the casing; the hydraulic accumulator is made in the suspended manner and equipped with the commutator with a flange for the attachment to the hydraulic accumulator, located in its lower part; the commutator is made with the channels, connected with the inlet and outlet connections, and with the holes for the controlling and regulating equipment attachment; and the filter casing is installed on the thread at the commutator. The technical effect—the size is reduced and the structure of the device is simplified due to minimizing the number of transition and connecting parts, while simultaneous improving the conditions for the monitor and control of water supply modes from one work place—from the commutator, which is the set of equipment for the device control automation in general.

A water discharge apparatus WD executes a water film formation step of ejecting running water and forming a water-splash suppression water film of the running water on a surface of a sterilization object, before executing a sterilization step of discharging sterilization water from a sterilization water ejection unit 20 toward the sterilization object.

A plumbing fitting with an outer body having a flow path extending therethrough, an inner body disposed in, and axially movable along an axis relative to the outer body, and sealing configured to prevent leakage of fluid from the plumbing fitting is disclosed. The inner body has tracks and the outer body has projections that are movable. Each track has a primary, outer portion, a secondary central portion and a tertiary outer portion. The angle of inclination of the secondary central portion is greater than the angle of inclination of the primary outer portion and of the tertiary outer portion. The angle of inclination is relative to the axis of axial movement. The plumbing fitting is movable between a first sealing configuration in which the projections are arranged in the primary outer portions, and a second sealing configuration in which the projections are arranged in the tertiary outer portions.

A safety device of a recirculating-water utilization system to be constructed in a specific area includes: at least one of a circulating-water monitoring unit configured to monitor a water quality of circulating water purified by a purifying unit, or a treatment-vessel monitoring unit configured to detect abnormality of treatment vessels constituting the purifying unit.

A household appliance includes a water inlet configured to connect the appliance to an external water supply; a pressure control device configured to prevent water entering the appliance from the water inlet from exceeding atmospheric pressure; a treatment container configured to treat household items with water; and a seal between the pressure control device and the treatment container configured to prevent gas flowing from the treatment container to the pressure control device.