A drain insert is described that provides a valve that prevents backflow of objects and materials through the drain inlet and which has an internal wall with a convex curvature. This convex curvature, which can be elliptical, provides improved fluid flow rates relative to straight walled, cylindrical configurations, permitting small diameter drains to utilize the drain insert while meeting IAPMO flow rate requirements.

A combined sewer/enclosure overflow (CSO) sensor system is described for accurate detection and measurement of overflow events. From the combined data, trending information can determine if there is debris accumulation. Rain masks can be used in the trending data to measure overall health. External sensors in combination with the CSO sensors provide predictive information and additional levels of information/data accuracy. The sensor system automatically and remotely monitors CSO locations and provides real-time data regarding start times, stop times, duration, and flow volumes of overflows that occur in these structures and provide regulatory and public notification of these events.

A combined sewer/enclosure overflow (CSO) sensor system is described for accurate detection and measurement of overflow events. From the combined data, trending information can determine if there is debris accumulation. Rain masks can be used in the trending data to measure overall health. External sensors in combination with the CSO sensors provide predictive information and additional levels of information/data accuracy. The sensor system automatically and remotely monitors CSO locations and provides real-time data regarding start times, stop times, duration, and flow volumes of overflows that occur in these structures and provide regulatory and public notification of these events.

A non-return valve includes a cylindrical valve seat insert that defines a fluid passageway and a valve seat terminating the passageway. A valve closure includes a valve flap that is pivotal about a pivot region with respect to the valve seat between a closed condition in which a periphery of the valve flap operatively engages the valve seat to close the fluid passageway and an open condition in which fluid is permitted to flow through the passageway. A biasing mechanism is interposed between the valve flap and an internal surface of the insert to bias the valve flap into the closed condition, the biasing mechanism being configured and arranged with respect to the valve flap such that a level of bias is adjusted to facilitate movement of the valve flap into the open condition.

A drain insert is described that provides a valve that prevents backflow of objects and materials through the drain inlet and which has an internal wall with a convex curvature. This convex curvature, which can be elliptical, provides improved fluid flow rates relative to straight walled, cylindrical configurations, permitting small diameter drains to utilize the drain insert while meeting IAPMO flow rate requirements.

A drain insert is described that provides a valve that prevents backflow of objects and materials through the drain inlet and which has an internal wall with a convex curvature. This convex curvature, which can be elliptical, provides improved fluid flow rates relative to straight walled, cylindrical configurations, permitting small diameter drains to utilize the drain insert while meeting IAPMO flow rate requirements.

A valve device for a domestic wastewater pipe is provided. The valve device includes a shutter and a fixing element to hold the shutter in the passage of the main duct between the inlet opening and the outlet opening of the pipe. The shutter is movable between a first configuration occluding the passage to prevent the flow of gaseous fluids, and a second configuration allowing the wastewater to flow from the inlet opening to the outlet opening of the pipe. The valve device includes a deformable main body partly defining the shutter, which occludes the passage of the main duct when the shutter is in the first configuration so that a pressure exerted by the wastewater on the shutter causes a reversible elastic deformation of said main body that moves the shutter from the first to the second configuration.

A valve device for a domestic wastewater pipe is provided. The valve device includes a shutter and a fixing element to hold the shutter in the passage of the main duct between the inlet opening and the outlet opening of the pipe. The shutter is movable between a first configuration occluding the passage to prevent the flow of gaseous fluids, and a second configuration allowing the wastewater to flow from the inlet opening to the outlet opening of the pipe. The valve device includes a deformable main body partly defining the shutter, which occludes the passage of the main duct when the shutter is in the first configuration so that a pressure exerted by the wastewater on the shutter causes a reversible elastic deformation of said main body that moves the shutter from the first to the second configuration.

An internal trap drain with large volume/high mass water seal for improved absorption of pressure fluctuations and extended duration of seal against evaporation in low-use conditions. Includes adjustable height strainer and water seal-protected weep holes.

An internal trap drain with large volume/high mass water seal for improved absorption of pressure fluctuations and extended duration of seal against evaporation in low-use conditions. Includes adjustable height strainer and water seal-protected weep holes.