A flow protector which protects drain weep holes. The flow protector is a cover, which maintains a space on top of the drain assembly that includes the weep holes which receive under-floor moisture, the flow protector cover including a top surface forming an angled surface, surrounded by an outer perimeter edge which is spaced from the top surface of the clamping ring, and forms an opening to the space only around the outer perimieter edge, This protects against mortar and other materials spilling into the weep holes.

An inflow fitting for the filling of a cistern comprises a housing, a water conduit disposed in the housing and having an entry and an exit, a float-controlled valve, which is disposed in the water conduit and which shuts off the water conduit or opens it up in the filling operation, and a float, which cooperates with the valve, for controlling the valve, wherein the float has a cavity, which is fillable with water, and at least one buoyancy chamber. The inflow fitting further comprises a supplemental water tap, branched off from the water conduit, for filling the said cavity in order to provide an additional weight. In the water conduit, in the region of the supplemental water tap, is arranged at least one backflow element, with which a backflow can be provided in the region of the supplemental water tap for the pressure-independent removal of supplemental water.

A hydropower installation includes a water supply and an energy generating station, with the supply at a higher level than the energy generating station; and a duct extending between the supply and the energy generating station. The energy generating station of the hydropower installation is configured based on high water velocity and low pressure. The duct may comprise plastic pipes. The duct may be arranged on a foam support and enclosed by a foam embedment. The duct may comprise at least two duct sections, with an intermediate energy generating station arranged between the duct sections of the duct. The duct may comprise internally extending protrusions, such as dimples to promote a laminar flow of fluid through the pipe. The duct may taper. Water pressure inside the duct may be maintained at atmospheric level. The proposed features all contribute to a pressure free velocity based system.

A dispenser system includes at least one main tubular element, at least one nozzle, and openings formed on the main tubular element. The at least one nozzle receives and injects a first fluid inside the main tubular element. The openings in conjunction with the nozzle (20) enable fluid circulation between inside and outside of the main tubular element.

A drainage control device includes a main body, an upper cover, a lower cover, a pressure relief cover, a membrane, and a return member. The main body has a water filling trough, a drainage trough, and a water passage trough. A drainage chamber having a drainage port is defined between the upper cover and the drainage trough. A water filling chamber has a water filling port is defined between the lower cover and the water filling trough. The pressure relief cover and the main body hold a periphery of the membrane. A water passage chamber is defined between the membrane and the water passage trough. A back-pressure chamber having a drain port is defined between the membrane and the pressure relief cover. The membrane is configured to open or close a junction of the water passage chamber and the drainage chamber. The membrane is returned by the return member.

A discharge valve apparatus of the present invention includes: a discharge portion main body member attached to discharge opening, forming the inside of discharge flow path for guiding flush water from an inflow opening formed at one end thereof to an outflow opening formed at the other end thereof; a valve body for opening and closing the inflow opening of the discharge portion main body member; and an affixing portion, formed to project into the discharge flow path of a discharge portion main body member, for affixing the discharge portion main body member to a reservoir tank; wherein the inside surface of side wall portion in the discharge portion main body member at the same height as this affixing portion forms a curved portion, which curves outward so as to expand the cross-sectional area of the flow path.

The invention relates to a heat recovery unit to transfer heat from a gray water source discharged from a bath or a shower to preheat fresh cold water supplying a bath, a shower, a boiler system or hot water heater. The heat recovery unit comprises an inner tube, an outer tube, a non-return valve, an anode, deflectors as well as associated piping and fittings. Fresh water from a pressurized public network or well flows through the inner tube while the gray water flows between the inner and outer tubes. The non-return valve installed in the fresh water pipe prevents contamination of the drinking water system. A translucent pipe may be installed in a section of the gray water piping system to detect any leaks. An insulated jacket may be placed around the unit to reduce heat loss. The heat recovery unit may be used in domestic, commercial, industrial and institutional buildings.

A shower system includes a shower waterway and a fluid control valve. The shower waterway is configured to be coupled to a shower device. The fluid control valve is coupled to the shower waterway and comprises a valve body and a piston. The valve body includes a chamber and a reservoir. The piston is slidably coupled to the valve body and fluidly separates the chamber from the reservoir. The chamber includes a compressible gas. The piston is configured to slidably translate within the valve body to compress the compressible gas in response to a water pressure fluctuation in the shower waterway.

The invention discloses a building drainage riser, its forming mold and forming method. The riser comprises a riser body and at least one spiral blade. The spiral blade is in a spiral direction on the inner wall of the riser body, and the spiral blade is fixedly connected to the inner wall of the riser body through its bottom side; the inner side of the radial section of the spiral blade presents the first normal distribution curve and the first normal distribution The abscissa axis of the curve is located on a chord of the inner wall of the riser body, and the distance from the chord to the center of the riser body is greater than half of the inner diameter of the riser body and less than the inner diameter of the riser body. The inner wall of the building drainage riser is provided with a spiral inner reinforcement with a radial section inside the first normal distribution curve, which completely eliminates the sharp tip and the sharp joint between the top and the inner wall of the building drainage riser, reduces the pressure fluctuation in the pipe during drainage and reduces the falling water flow speed. In addition, the molding die and forming method have the advantages of simple structure and low cost.

The invention discloses a building drainage riser, its forming mold and forming method. The riser comprises a riser body and at least one spiral blade. The spiral blade is in a spiral direction on the inner wall of the riser body, and the spiral blade is fixedly connected to the inner wall of the riser body through its bottom side; the inner side of the radial section of the spiral blade presents the first normal distribution curve and the first normal distribution The abscissa axis of the curve is located on a chord of the inner wall of the riser body, and the distance from the chord to the center of the riser body is greater than half of the inner diameter of the riser body and less than the inner diameter of the riser body. The inner wall of the building drainage riser is provided with a spiral inner reinforcement with a radial section inside the first normal distribution curve, which completely eliminates the sharp tip and the sharp joint between the top and the inner wall of the building drainage riser, reduces the pressure fluctuation in the pipe during drainage and reduces the falling water flow speed. In addition, the molding die and forming method have the advantages of simple structure and low cost.