An air release valve and an air pressure driven toilet water tank drain valve are provided. The air release valve includes a valve seat, a sliding block, and a push block. A bottom of the valve seat is provided with an air release channel, one end of the air release channel is an air inlet, and the other end of the air release channel forms an air release nozzle. The sliding block is located above the air release nozzle and is slidably arranged on the valve seat. The air pressure driven toilet water tank drain valve includes a drain valve body, an inner core tube, a limit device, a telescopic airbag, an air pump, the air release valve, a controller and an electronic induction switch. The air release valve with mechanical structure does not require power consumption and has low cost.

An air release valve and an air pressure driven toilet water tank drain valve are provided. The air release valve includes a valve seat, a sliding block, and a push block. A bottom of the valve seat is provided with an air release channel, one end of the air release channel is an air inlet, and the other end of the air release channel forms an air release nozzle. The sliding block is located above the air release nozzle and is slidably arranged on the valve seat. The air pressure driven toilet water tank drain valve includes a drain valve body, an inner core tube, a limit device, a telescopic airbag, an air pump, the air release valve, a controller and an electronic induction switch. The air release valve with mechanical structure does not require power consumption and has low cost.

The system includes a fluid valve with a modular and/or replaceable fluid control assembly that requires maintenance over a product life of the fluid valve. The modular and/or replaceable fluid control assembly includes at least one portion including a setting or presetting configured and arranged to control fluid flow behavior in the fluid valve. The setting or presetting is useable to control fluid flow in the modular and/or replaceable fluid control assembly after an upgrade or replacement of at least a portion of the modular and/or replaceable fluid control assembly. Further, the setting or presetting enables the modular and/or replaceable fluid control assembly to retain the fluid flow behavior following one or more upgrades or replacements of one or more portions of the modular and/or replaceable fluid control assembly.

A self-locking water level adjusting mechanism includes a partition plate, an adjusting clamping structure arranged on one side of the partition plate, and an adjusting lock. The adjusting clamping structure is slidably connected with the partition plate in a vertical direction. The adjusting lock is elastically connected with the partition plate through an elastic piece. The adjusting lock is clamped with the adjusting clamping structure under restoring force of the elastic piece.

A self-locking water level adjusting mechanism includes a partition plate, an adjusting clamping structure arranged on one side of the partition plate, and an adjusting lock. The adjusting clamping structure is slidably connected with the partition plate in a vertical direction. The adjusting lock is elastically connected with the partition plate through an elastic piece. The adjusting lock is clamped with the adjusting clamping structure under restoring force of the elastic piece.

A drain valve assembly includes a valve housing having an inlet port and an outlet port and a water collection chamber between the inlet port and the outlet port, and a poppet valve positioned in the water collection chamber and arranged to be normally sealingly positioned across the outlet port to prevent water exiting the water collection chamber to the outlet port. The poppet valve is attached to a pressure diaphragm across the water collection chamber such that when the pressure in the water collection chamber exceeds a predetermined opening pressure it causes the diaphragm to lift and to lift the poppet out of sealing engagement across the outlet port such that water can drain to the outlet port from the water collection chamber. The poppet valve has a hollow body defining a channel from a first end of the poppet valve.

A manual override mechanism for use in a vacuum toilet system may comprise: a shaft extending from a knob; a traveler configured to engage the shaft, the traveler comprising a first gear; a motor rack comprising a second gear configured to engage the first gear; and a flush gate extending from the motor rack, the flush gate configured to transition from a closed position to an open position in response to rotation of the shaft.

A manual override mechanism for use in a vacuum toilet system may comprise: a shaft extending from a knob; a traveler configured to engage the shaft, the traveler comprising a first gear; a motor rack comprising a second gear configured to engage the first gear; and a flush gate extending from the motor rack, the flush gate configured to transition from a closed position to an open position in response to rotation of the shaft.

A drainage system for a pressure-assisted flush water tank includes a tank main body and a drainage structure. The drainage structure includes an accommodating chamber and a membrane. The accommodating chamber has a drain outlet, a water inlet, and a drainpipe. The membrane partitions the accommodating chamber into a back-pressure chamber and a drainage chamber and is provided with a supplement hole that communicates the back-pressure chamber with the drainage chamber. The drain outlet is communicated with the back-pressure chamber, while the water inlet and the drainpipe are both communicated with the drainage chamber. The tank main body defines therein a storage chamber communicated with the water inlet. The membrane moves toward or departs from the drainpipe as a pressure in the back-pressure chamber varies so as to close or open the drainpipe.

An elevated flush valve comprising a vent cover may be used with various assemblies, particularly for high efficiency and high performance toilets, which vent cover has a wall that includes an upper portion, a lower portion configured to define a vent cover inlet opening for receiving air and/or liquid passing upwardly from within a valve body and/or from within a toilet through a toilet inlet when the vent cover is installed on a valve body, an exterior surface, and an interior surface defining a vent cover passage for air passing upwardly from the vent cover inlet opening. At least the upper portion of the vent cover wall is configured for contacting an interior surface of a valve body at a location above an inlet of an overflow or venting tube on a valve body when the vent cover is installed on a valve body and wherein the valve cover wall is configured to at least partially divert flow of fluid from entering an inlet of an overflow tube or a venting tube on a valve body when the vent cover is installed on a valve body.