Abstract: Apparatus for siphoning liquid such as water which accumulates in a ponding area (16) located on a flat roof (12) to a drain (14) is disclosed. The apparatus includes a first liquid conduit (21) which has one end (58) in the accumulated water and a second end (52) in drain (14). A reservoir (26) (64) accumulates a selected volume of water which is transferred from the reservoir (26) (64) by a second liquid conduit (38) to the first liquid conduit (21) such that the first liquid conduit (21) is completely filled with water suitable for initiating siphoning action of the water in ponding area (16) to drain (14). A means for controlling the flow of liquid from reservoir (26) (64) to first conduit (21) such as float valve (36) is included such that there is no transfer of liquid from reservoir 26 to first liquid conduit 21 until the selected volume of water has accumulated.

Abstract: Apparatus for periodically draining, flushing and replacing the operational water supply in an evaporative cooler during operation thereof and for completely draining the cooler when its operation is terminated. The apparatus includes a special siphon drain valve mounted in the sump of the cooler so as to be normally in an unprimed non-siphoning state and when in such a state, the evaporative cooler will operate in the normal manner. When the cooler is in normal operation, its water supply will increase in mineral salt concentration and other contaminants, such as dirt, bacteria and the like.

Abstract: Apparatus for periodically draining, flushing and replacing the water supply in an evaporative cooler during operation thereof and for completely draining the cooler when its operation is terminated. The apparatus includes a siphon drain valve mounted in the sump of the cooler and configured for movement between siphoning and non-siphoning positions with the movement being controlled by a solenoid. When the cooler is in normal operation, the solenoid is deenergized which places the siphon drain valve in the non-siphoning position and when in such normal operation, the water supply will increase in mineral salt concentration and other cooler damaging contaminants. At periodic intervals, such as under control of a time clock, the apparatus is switched to its draining, flushing and water replacing operation mode. This is accomplished by energizing the solenoid to initiate the siphoning action of the siphon drain valve to drain the water from the cooler.

Abstract: Apparatus for intermittently supplying a predetermined quantity of water at regular, predetermined intervals comprising: a water tank for accumulating and storing water; water feeding means and inlet valve means; float-actuated valve means within said water tank; a down pipe connected to said water tank and terminating in a tapered tube; a siphon tube from said water tank terminating in a tapered tube which extends together with the tapered tube of said down pipe into a venturi outlet; and, an ejector tube extending downwardly from said venturi outlet.

Abstract: An apparatus is disclosed which is capable of producing usable energy as a result of the rise and fall of ocean tides. A second reservoir is connected to a natural reservoir such as the ocean by means of a duct system wherein the duct openings in the two reservoirs are established at levels which will constantly be submerged. Upon charging the duct system with water, the siphon principle will urge the flow of water back and forth through the duct system between the two reservoirs as the water in the second reservoir seeks a level of equilibrium with that of the ocean. A turbine is mounted in the duct system and is driven by the substantially continuous flow of water back and forth through the system thereby producing a source of useable energy.

Abstract: An automatic water supply device for animals or plants, which uses a siphon tube for transferring a batch of water from a vessel having a float-valve type water inlet control device to a tray. The water transferring operation of the siphon tube is triggered by the water head applied to the siphon's outlet end and by the water received in the tray being reduced by a predetermined amount due to reduction of water level in the tray. The inlet tube portion of the siphon tube located in the internal space of the vessel has a diverged open end having an opening area which is substantially larger than that of the outlet tube portion of the siphon tube.

Abstract: A flat roof solar powered auxiliary drain system having master and satellite modules with respective drain lines and electric pumps for charging the drain lines for syphoning standing water from a flat roof, the master module having a battery and a solar cell for charging the battery for supplying power for operating the electric pumps and a control circuit for selectively energizing the electric pumps for removing standing water.

Abstract: An automatic flushing device for an evaporative cooling system contains a water sump, circulating pump, and float-operated water makeup source. A small, adjustable portion of the return flow enters a separate timing reservoir. When the timing reservoir is full, water from the well and the sump are flushed from the system through a siphon tube which communicates with both chambers.

Abstract: An apparatus for feeding substantially uniform amounts of a chemical into a liquid stream having an irregular flow pattern. In accordance with an embodiment of the present invention there is provided a holding tank having an inlet port for receiving a liquid stream, such as the effluent of a septic system. The tank has an aperture located at a relatively high position in a side wall thereof. A siphon means is provided and comprises an inverted U-shaped section of pipe passing through the aperture and having an inner leg which extends to a position near the bottom of the tank. The siphon means also has an outer leg which extends to a position substantially below the bottom of the tank. Chemical feeding means, preferably in the form of an erosion feeder, are coupled to the outer pipe leg of the siphon means. The feeding means contains a supply of the chemical additive and is operative to feed the chemical into the liquid discharged from the outer leg.