A drain fitting for a toilet cistern including a drain valve, which is constructed from a discharge nozzle mounted on the cistern and a lift-adjustable overflow tube, which closes a flow passage through the discharge nozzle in its closed position, and having a pneumatic actuator, with the aid of which, upon the application of pressure, the overflow tube is adjustable into its open position, in which a quantity of flush water is able to flow out of the discharge nozzle of the toilet cistern. An underpressure may be applied to the pneumatic actuator to lift-adjust the overflow tube into its open position. The drain fitting includes an, in particular water-conducting, underpressure unit, which is connected to the pneumatic actuator and generates an underpressure acting upon the pneumatic actuator upon activation by the user.

A flow diverter for diverting flow between a toilet bowl and a toilet tank, the flow diverter having: a body with an inlet, outlet and pressure relief vent; and a flow adjustment mechanism rotatable around the outlet to selectively divert different percentages of flow between the outlet and the pressure relief vent by moving a stopper in and out of the outlet by rotating a sleeve of the flow adjustment mechanism around the outlet.

The disclosure is directed to a dynamic siphon assembly according to some embodiments. In some embodiments, the dynamic siphon assembly includes a dynamic siphon that is configured to evacuate fluid from a cistern when pushed down. In some embodiments, the dynamic siphon assembly includes a full flush actuation assembly and a partial flush actuation assembly. In some embodiments, each actuation assembly is configured to break the siphonic action of the dynamic siphon at different times and water level. In some embodiments, the dynamic siphon includes an air trap configured to trap surrounding gas such that the dynamic siphon rises during filling of the cistern. In some embodiments, the rising prevents siphonic action by raising a fluid overflow within the dynamic siphon above a fluid level in the cistern.

A method for operating an on-board water supply and distribution system of an aircraft includes a central water tank, central pump, consumer assemblies each including a supply device to supply water, and a high-pressure conduit system. The high-pressure conduit system connects the downstream side and consumer assemblies and is configured where the central pump can deliver water from the downstream side to the consumer assemblies. The method includes operating the central pump where water in the high-pressure conduit system is pressurized to a predetermined first pressure, operating the consumer assemblies where in each of the consumer assemblies the connection between the buffer tank of the consumer assembly and the high-pressure conduit system is in a closed position, monitoring pressure for a predetermined first period of time, and providing a first failure signal when pressure drops below a predetermined second pressure within the first period of time.

A mechanical control logic actuator for a vacuum toilet includes: a pneumatic valve assembly configured to control an air path of the vacuum toilet and a sewage tank; a vacuum tank configured to provide vacuum compensation for the sewage tank; a first pressure tank configured to provide a power source for the pneumatic valve assembly; a second pressure tank configured to feed gas into the sewage tank; and a sewage pipe configured to discharge sewage in the sewage tank; wherein the first pressure tank controls the air path to be in a circulation state or in a cut-off state through the pneumatic valve assembly, the vacuum tank provides vacuum compensation for the sewage tank, the sewage in the toilet is pumped into the sewage tank, the second pressure tank feeds gas into the sewage tank, the sewage tank is pressurized and the sewage is discharged through the sewage pipe.

Some embodiments include a fluid valve assembly with an outlet base dimensioned to be positioned through a drain in a fluid tank, and a float assembly including a moveable float. The moveable float can form a fluid-tight seal at a first end when the moveable float is coupled to the outlet base, and a flow opening when the moveable float is at least partially decoupled from the outlet base. Some embodiments include a housing positioned with the moveable float, where the housing encloses a suction device coupled to a moveable piston. Some embodiments include an actuable diaphragm positioned in the outlet base, and a compressed air tube or passageway coupled to one side the actuable diaphragm. In some embodiments, the actuable diaphragm is configured and arranged to be actuated by compressed air to move the moveable piston.

A flush water tank apparatus has a reservoir tank, a discharge valve, a discharge valve hydraulic drive portion configured to drive the discharge valve, and a discharge/vacuum break valve device configured to supply the water supplied from the upstream side to the discharge valve hydraulic drive portion on a downstream side. The discharge valve hydraulic drive portion includes a cylinder, and a piston configured to be moved by a pressure of the water flowing into the cylinder to move the discharge valve. The discharge/vacuum break valve device includes a valve body that operates to discharge the water flowing backward from the discharge valve hydraulic drive portion while opening the upstream side to an atmosphere when the supply of the water from the upstream side is stopped.

A flow diverter for diverting flow between a toilet bowl and a toilet tank, having: a body having an inlet, a first outlet and a second outlet; and a flow adjustment mechanism rotatable within the body to selectively divert different percentages of flow between the first outlet and the second outlet; and an air vent and diaphragm in the body to prevent a siphon flow from the first or second outlet back to the inlet.

Toilet arrangement, which includes a gravity toilet bowl (1) provided with a water trap (11) and an outlet (12). The arrangement further includes a water valve (5), a flush water tank (4), and a flush valve (6) arranged between the flush water tank (4) and the toilet bowl (1), and an activating means (8) for activating a flushing sequence. In order to allow for the use of a standard gravity toilet bowl in connection with a vacuum sewage system, the toilet arrangement comprises an adapter (13) which is arranged between the gravity toilet bowl (1) and a discharge valve (2) connected to a vacuum sewer piping (3). A control mechanism (7) is connected to the vacuum sewer piping (3), the discharge valve (2), the water valve (5) and the flush valve (6), whereby the control mechanism (7) is arranged to be activated by means of the activating means (8).

Some embodiments include a fluid control system with an outlet valve assembly, an inlet valve assembly including a venturi inlet valve, and an actuator coupled to the inlet valve assembly. In some embodiments, the actuator can enable a user to control a flush volume of fluid control system. Some embodiments include a moveable float positioned in a chamber of the outlet valve assembly, where the chamber includes a variably-sized upper portion with a volume that is based at least in part on a variable position of the moveable float in the chamber. Some embodiments include a adjustable control valves coupled to an outer surface of the outlet valve assembly and the inlet valve assembly. Some embodiments also include a bellows positioned in and coupled to the variably-sized upper portion. In some embodiments, the bellows are fluidly coupled to the venturi inlet valve and at least one of the control valves.