Abstract: A backwater gate valve assembly having a gate valve movable between a closed position where the gate occludes an outlet opening and an open position where the gate valve does not occlude the outlet opening. The gate valve is coupled to a motorized actuator that is configured to move the gate valve between the open and closed positions upon sensing of a predetermined level of water in the body of the backwater gate valve assembly.

Abstract: An embodiment wall hydrant includes a reservoir, conduits containing an operating rod assembly and a service rod assembly, and a fluid outlet with a hose connector. The service rod assembly allows water supply to the hydrant to be shut-off from the front of the hydrant which allows servicing of the hydrant without requiring water shut-off to all or a portion of the water supply to the building. Embodiments include a vacuum relief dual check valve assembly at the fluid outlet which prevents backflow of water into the hydrant. Embodiments include a box which protects the hydrant controls.

Abstract: An embodiment wall hydrant includes a reservoir, conduits containing an operating rod assembly and a service rod assembly, and a fluid outlet with a hose connector. The service rod assembly allows water supply to the hydrant to be shut-off from the front of the hydrant which allows servicing of the hydrant without requiring water shut-off to all or a portion of the water supply to the building. Embodiments include a vacuum relief dual check valve assembly at the fluid outlet which prevents backflow of water into the hydrant. Embodiments include a box which protects the hydrant controls.

Abstract: An embodiment wall hydrant includes a reservoir, conduits containing an operating rod assembly and a service rod assembly, and a fluid outlet with a hose connector. The service rod assembly allows water supply to the hydrant to be shut-off from the front of the hydrant which allows servicing of the hydrant without requiring water shut-off to all or a portion of the water supply to the building. Embodiments include a vacuum relief dual check valve assembly at the fluid outlet which prevents backflow of water into the hydrant. Embodiments include a box which protects the hydrant controls.

Abstract: An embodiment wall hydrant includes a reservoir, conduits containing an operating rod assembly and a service rod assembly, and a fluid outlet with a hose connector. The service rod assembly allows water supply to the hydrant to be shut-off from the front of the hydrant which allows servicing of the hydrant without requiring water shut-off to all or a portion of the water supply to the building. Embodiments include a vacuum relief dual check valve assembly at the fluid outlet which prevents backflow of water into the hydrant. Embodiments include a box which protects the hydrant controls.

Abstract: An embodiment includes a drain pipe waste water closure protection device which allows passage of fluids through a drain into a pipe waste water closure and a waste water pipe while preventing backflow of fluid or gas from the waste water pipe and pipe waste water closure, as well as preventing evaporation of a water-containing pipe waste water closure located below the drain pipe waste water closure protection device in the waste water pipe. Embodiment drain pipe waste water closure protection devices are easily installed in existing or new drains. Embodiments have two radial disc seals which insure a strong seal between the drain pipe waste water closure protection device and the drain wall. Embodiments include a reinforcing band embedded below the radial disc seals which prevents failure of the radial disc seals. Embodiments include a quadruple pressure accumulating seal which protects against the flow of gas or fluid from the waste water pipe.

Abstract: An embodiment providing one or more improvements includes a drain trap seal which allows passage of fluids through a drain into a waste pipe while preventing backflow of fluid or gas from the waste pipe, as well as preventing evaporation or a water-containing trap seal located below the drain trap seal in the waste pipe. Embodiment drain trap seals are easily installed in existing or new drains. Embodiments have two annular ring seals which insure a strong seal between the drain trap seal and the drain wall. Embodiments include a reinforcing band embedded below the annular ring seals which prevents failure of the annular ring seals.

Abstract: An exemplary embodiment providing one or more improvements includes a positive acting sensor which detects the flow of water through a flat roof secondary or emergency roof drain. In embodiments a signal from the sensor is conveyed by a conductor or by wireless means to an alarm box. In embodiments the alarm box provides an audible and or a visual signal indicating a minimal water flow in the secondary drain.

Abstract: The automatic grease separator receives wastewater containing grease and other light fluids, separates the water portion from the light fluids portion, and stores the light fluids portion. A computer is used to control the operation of separator functions including automatic transfer of light fluids from the separator to grease containers and automatic shut-down of the separator when its capacity is exceeded. Warning devices which indicate malfunction or the need for maintenance also are controlled by the computer. The grease separator uses grease level sensors based on capacitive level sensing. These sensors are insensitive to coating of the sensors by grease and oil. The grease and other light fluids are maintained in a fluid phase by the thermostatic-controlled addition of hot water. This feature provides an added element of safety by eliminating the need to heat the separator by a resistant heater which introduces the possibility of a grease fire.