An apparatus for a urinal is described. The apparatus comprises a plate member adapted to form a seal with a urinal outlet, the plate member defining a throughbore permitting the passage of liquid, in use, from the urinal to a soil pipe and a diaphragm located in the plate member throughbore, the diaphragm adapted to permit the passage of liquid through the throughbore in one direction only from the urinal to the soil pipe.

A fitting (10) for a sanitary unit outlet (5) has a tubular housing (12) having an inlet (14) and an outlet (16), a grid (18) associated with the housing inlet (14) and a one-way valve (20) associated with the housing outlet (16). The housing (12), grid (18) and one-way valve (20) are removable from the sanitary unit outlet (5) as a single entity.

A fitting (10) for a sanitary unit outlet (5) has a tubular housing (12) having an inlet (14) and an outlet (16), a grid (18) associated with the housing inlet (14) and a one-way valve (20) associated with the housing outlet (16). The housing (12), grid (18) and one-way valve (20) are removable from the sanitary unit outlet (5) as a single entity.

A drain valve has a housing defining a drain conduit for the passage of fluids to be drained, the drain conduit having a first rim defining an inlet to the drain conduit opposite a second rim defining an outlet from the drain conduit. One or more non-return valves are within the drain conduit between the first rim and the second rim and have a closed configuration and an open configuration adapted to allow fluids to flow through the outlet of the drain conduit. A vent conduit extends within the drain conduit and comprises internally a lower valve seat, an upper valve seat and a bypass valve positioned between the lower valve seat and the upper valve seat. The bypass valve is adapted to allow gas to bypass the one or more non-return valves and escape to atmosphere when the gas reaches a predetermined pressure.

A drain valve has a housing defining a drain conduit for the passage of fluids to be drained, the drain conduit having a first rim defining an inlet to the drain conduit opposite a second rim defining an outlet from the drain conduit. One or more non-return valves are within the drain conduit between the first rim and the second rim and have a closed configuration and an open configuration adapted to allow fluids to flow through the outlet of the drain conduit. A vent conduit extends within the drain conduit and comprises internally a lower valve seat, an upper valve seat and a bypass valve positioned between the lower valve seat and the upper valve seat. The bypass valve is adapted to allow gas to bypass the one or more non-return valves and escape to atmosphere when the gas reaches a predetermined pressure.

A apparatus and system for filtering wastewater from a basin is disclosed, wherein the apparatus prevents backflow of waste water, provides easy access for cleaning and replacing strainers, and a viewing window. The apparatus also provides additional ports for draining the apparatus.

A apparatus and system for filtering wastewater from a basin is disclosed, wherein the apparatus prevents backflow of waste water, provides easy access for cleaning and replacing strainers, and a viewing window. The apparatus also provides additional ports for draining the apparatus.

A sealing device having a positive and negative pressure resistant water seal protection function. The sealing device comprises a sleeve body; an opening and closing valve plate is rotatably connected to the lower end of the sleeve body; a negative pressure valve mechanism is arranged at a side portion of the sleeve body; the negative pressure valve mechanism comprises a groove body and a multifunctional cover; the groove body is of a bevel structure; a pressure conduction film is provided on the bevel of the groove body facing the inner side of the sleeve body; a pressure conduction body corresponding to the pressure conduction film is arranged in the groove body; a push rod of the pressure conduction body passes through the multifunctional cover in a connection fit with the groove body; the push rod works in conjunction with the opening and closing valve plate by means of a locking mechanism; and the multifunctional cover is provided with a gas pressure hole communicated with a sewer line. The sealing device can prevent negative pressure from damaging water seal.

A sealing device having a positive and negative pressure resistant water seal protection function. The sealing device comprises a sleeve body; an opening and closing valve plate is rotatably connected to the lower end of the sleeve body; a negative pressure valve mechanism is arranged at a side portion of the sleeve body; the negative pressure valve mechanism comprises a groove body and a multifunctional cover; the groove body is of a bevel structure; a pressure conduction film is provided on the bevel of the groove body facing the inner side of the sleeve body; a pressure conduction body corresponding to the pressure conduction film is arranged in the groove body; a push rod of the pressure conduction body passes through the multifunctional cover in a connection fit with the groove body; the push rod works in conjunction with the opening and closing valve plate by means of a locking mechanism; and the multifunctional cover is provided with a gas pressure hole communicated with a sewer line. The sealing device can prevent negative pressure from damaging water seal.

A non-flushing urinal system with a large sealing and flow area using a bell-shaped valve with supporting ribs on its interior surface, which utilizes low crack pressure, or ease of initial opening to create for high flow rate and superior sealing.