Provided are: a drainage device with which the timing of drainage can be controlled; and a drainage system equipped with the same. The drainage device is characterized by comprising a siphon mechanism 2 that is provided inside a water tank 1, and is constituted from a siphon pipe 20 and a cylindrical part 30. The drainage device is also characterized in that: one end side of the siphon pipe 20 has a first opening part 21a that is open at the top part thereof, and the other end side has a first connection part 24a that is connected to an overflow pipe 3; the cylindrical part 30 has a second opening part 21b of which the inner diameter is larger than that of the siphon pipe 20, into which the first opening part 21a of the siphon pipe 20 is inserted, and which is open at the bottom part thereof; the second opening part 21b is set at a position lower than the first opening part 21a; and a second connection part 30b, which is for selectively connecting the inside of the cylindrical part to an air pump 5 or to the atmosphere, is provided to the top surface of the cylindrical part 30.

Provided are: a drainage device with which the timing of drainage can be controlled; and a drainage system equipped with the same. The drainage device is characterized by comprising a siphon mechanism 2 that is provided inside a water tank 1, and is constituted from a siphon pipe 20 and a cylindrical part 30. The drainage device is also characterized in that: one end side of the siphon pipe 20 has a first opening part 21a that is open at the top part thereof, and the other end side has a first connection part 24a that is connected to an overflow pipe 3; the cylindrical part 30 has a second opening part 21b of which the inner diameter is larger than that of the siphon pipe 20, into which the first opening part 21a of the siphon pipe 20 is inserted, and which is open at the bottom part thereof; the second opening part 21b is set at a position lower than the first opening part 21a; and a second connection part 30b, which is for selectively connecting the inside of the cylindrical part to an air pump 5 or to the atmosphere, is provided to the top surface of the cylindrical part 30.

A multiple stage discharge system for a gravity-fed emergency shower system is provided herein. The multiple stage discharge system includes a drain; a first opening defined by the drain; a second opening defined by the drain; and a valve mechanism coupled to the second opening to permit fluid in a fluid tank of the gravity-fed emergency shower system to flow at least partly through the drain via the second opening in response to a fluid level in the fluid tank decreasing to at or below a threshold fluid level.

A hydrodynamic electrification system that generates electricity from water moving from a high side to a low side and around a structure that divides the low side from the high side generally includes a water transport system that directs the water from the high side presenting a hydraulic head, over the structure, and to the low side. The system includes a power extraction system having a wheel that receives the water from said water transport system and a mounting system having a high side anchor that connects near an intake to the water transport system at the high side and having a low side anchor that connects to the power extraction system at the low side.

The invention is a fluid handling process whereby a submerged pulsating low-pressure gas displacement pump is assisted by an inverted hydrostatic standpipe for the purpose of transporting ambient pressure liquid and gas. An apparatus with no moving parts pumps and transports gas and liquid at near-ambient pressure as a mixed medium by means of subtle design-induced pressure differentials within the inverted hydrostatic standpipe, siphon, pump chamber and riser, enabling conveyance over extended distances and inclined planes.

The invention is a fluid handling process whereby a submerged pulsating low-pressure gas displacement pump is assisted by an inverted hydrostatic standpipe for the purpose of transporting ambient pressure liquid and gas. An apparatus with no moving parts pumps and transports gas and liquid at near-ambient pressure as a mixed medium by means of subtle design-induced pressure differentials within the inverted hydrostatic standpipe, siphon, pump chamber and riser, enabling conveyance over extended distances and inclined planes.

A drainage apparatus (100, 300-800) for siphoning liquid between first and second reservoirs (102, 104) is disclosed. In a first embodiment, the apparatus (100) includes a conduit arrangement having a first opening (112) disposed in the first reservoir (102), a second opening (114) disposed in the second reservoir (104) and a liquid injection inlet (106M2) arranged between the first and second openings (112,114), and a plurality of valves (108, 110) for controlling flow of the liquid along the conduit arrangement. A method (200) for priming the drainage apparatus (100) comprises directing liquid into the conduit arrangement at (202) via the liquid injection inlet (106M2) to fill up most of the conduit arrangement as controlled by the valves' configuration; directing liquid into the first reservoir (102) to enable more liquid to enter into the conduit arrangement via the first opening (112) to flood the conduit arrangement to form a continuous liquid flow path which extends from the first opening (112) up to at least the second opening (114), the continuous liquid flow path creating a siphon; and with the first opening (112) kept below the liquid's surface level in the first reservoir (102), stopping the flow of liquid into the first reservoir (102) to achieve a state of equilibrium of the siphon to prime the conduit arrangement. After the priming and in use, the siphon is triggered when more liquid is added into the first reservoir (102) which causes the added liquid to be siphoned to the second reservoir (104) via the primed conduit arrangement.

A drainage apparatus (100, 300-800) for siphoning liquid between first and second reservoirs (102, 104) is disclosed. In a first embodiment, the apparatus (100) includes a conduit arrangement having a first opening (112) disposed in the first reservoir (102), a second opening (114) disposed in the second reservoir (104) and a liquid injection inlet (106M2) arranged between the first and second openings (112,114), and a plurality of valves (108, 110) for controlling flow of the liquid along the conduit arrangement. A method (200) for priming the drainage apparatus (100) comprises directing liquid into the conduit arrangement at (202) via the liquid injection inlet (106M2) to fill up most of the conduit arrangement as controlled by the valves' configuration; directing liquid into the first reservoir (102) to enable more liquid to enter into the conduit arrangement via the first opening (112) to flood the conduit arrangement to form a continuous liquid flow path which extends from the first opening (112) up to at least the second opening (114), the continuous liquid flow path creating a siphon; and with the first opening (112) kept below the liquid's surface level in the first reservoir (102), stopping the flow of liquid into the first reservoir (102) to achieve a state of equilibrium of the siphon to prime the conduit arrangement. After the priming and in use, the siphon is triggered when more liquid is added into the first reservoir (102) which causes the added liquid to be siphoned to the second reservoir (104) via the primed conduit arrangement.

A double-bell siphon for liquid flow control that improves upon existing bell siphons by the addition of an outer bell which helps the bell siphon to stop siphoning when the liquid level drops below the intended level. Optionally, a cup further enhances the ability for the siphon to stop properly.

A double-bell siphon for liquid flow control that improves upon existing bell siphons by the addition of an outer bell which helps the bell siphon to stop siphoning when the liquid level drops below the intended level. Optionally, a cup further enhances the ability for the siphon to stop properly.