Abstract: A water flow control valve (10) designed to be installed externally on a toilet tank (108) or as an integral element of a toilet ballcock (110). The valve (10) incorporates a diaphragm (46), a spring (62), a poppet assembly (70), and an inlet port (38) that is connected to a utility water supply (100) and an outlet port (42) that is connected through a pipe (102) to a fitting (106) on the the toilet tank (108). The valve functions by sensing the pressure at the inlet port (38). When no large demands are placed on the water supply (100), the valve (10) remains open, thus allowing the toilet tank (108) to fill. When a shower is turned on, the water pressure drops which reduces the upward force on the diaphragm (46), thus allowing the spring (62) to place the poppet (70) in a closed position which prevents the toilet tank (108) from filling. When the water demand ceases, the water pressure opens the valve (10), which allows the toilet tank (108) to fill.

Abstract: A remotely controlled security lighting system (10) that utilizes the common utility power lines of a building to provide communication between a master control/transmitting unit (12) and a plurality of remote light/receiving units (50). The unit (12) includes a light selector switch (16) that allows a particular light to be selected, a light power switch (18) that powers the selected light and a joystick (20) that positions the selected light in azimuth and elevation. The remote light/receiving unit (50) includes azimuth and elevation motors (64)(68) that are mechanically linked to the light (72), and a light power controller (70) that applies power to the light. In a typical situation, a remote light/receiving unit (50) would be attached to each upper corner of a structure and each unit (50) would be connected to the utility power line.