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 application discloses a pneumatic valve control device, which comprises an air cylinder provided with a first piston and an air outlet and a hydraulic cylinder provided with a second piston and an air vent; a partition is arranged between the hydraulic cylinder and the air cylinder, and a partition channel is arranged on the partition; the second piston is connected with a piston rod capable of passing through the partition channel; the piston rod is connected with a tappet valve for opening and closing the partition channel, and the tappet valve is capable of withdrawing from the partition channel with an upward movement of the piston rod and jacking up the first piston; and the air cylinder further comprises a locking and releasing mechanism capable of locking and releasing the first piston that is jacked up; and herein, when the locking and releasing mechanism is unlocked and the first piston is in a descending, falling back state, the partition channel is in a closed state, and the air outlet is in an outward exhaust state. The pneumatic valve control device disclosed by the application is more labor-saving and convenient to operate, and improves a performance of products.

A double flow control mechanism of a soft touch drain valve and a double flow control method, includes a base, a float component and a starting component. The base is assembled with a valve body. The float component is has a flowing passage and can move relative to the base to open and close the drainage opening. The flowing passage connects the inside and the outside of the float chamber of the float component. The starting component controls the size of the flowing passage. The first starting switch can open a smaller flowing passage of the float component; the resultant force drains a first drainage volume of water. The second starting switch can open a larger flowing passage of the float component; the resultant force drains a second drainage volume of water.

There are provided a flush water tank apparatus capable of accurately setting the amount of flush water to be discharged while opening a discharge valve by a discharge valve hydraulic drive unit. A flush water tank apparatus includes a valve controller, where, in a case where a first amount of flush water is selected, the valve controller causes the timing control mechanism to be engaged with the discharge valve and causes the timing control mechanism to operate such that engagement is released after a lapse of a first period of time, and in a case where a second amount of flush water is selected, the valve controller causes the timing control mechanism to be engaged with the discharge valve and causes the timing control mechanism to operate such that engagement is released after lapse of a second period of time shorter than the first period of time.

The present invention is a flush water tank apparatus (4) and includes: a storage tank (10) on which a drain port (10a) is formed, a discharge valve (12) opening/closing the drain port; a discharge valve hydraulic drive unit (14) driving the discharge valve using water supply pressure; a clutch mechanism (30) coupling the discharge valve and the discharge valve hydraulic drive unit to pull up the discharge valve; flush water amount selection device capable of selecting between a first and a second amount of flush water; a timing control mechanism controlling a timing of the drain port being blocked; and a control jet unit (20) jetting, when the second amount is selected, flush water to a water receiving surface provided on the timing control mechanism so that a timing of the drain port being blocked is earlier than a case of the first amount of flush water.

A flush water tank apparatus enabling accurately setting an amount of flush water to be discharged while opening a discharge valve via a discharge valve hydraulic drive unit and a flush toilet apparatus including the flush water tank are provided. A flush water tank apparatus includes a first float device; a second float device that prevents from descent of the discharge valve according to the water level so as to discharge a second amount of flush water; and an adjustment mechanism configured so that when the second amount of flush water is selected by the flush water amount selection portion the clutch mechanism is disconnected at a pull-up height of the discharge valve such that the discharge valve descended by the disconnection of the clutch mechanism is held by the second float device in a holding state.

The flush water tank apparatus of the present invention includes: a clutch mechanism 30 coupling the discharge valve 12 and the discharge valve hydraulic drive unit 14 to pull up the discharge valve, and being disconnected at a predetermined timing to cause the discharge valve to descend; flush water amount selection device capable of selecting from a first and a second amounts of flush water; a float device 26 including a float and a holding mechanism switchable between a holding and a non-holding states in conjunction with movement of the float; and a timing control mechanism controlling a timing of a drain port 10a being blocked; and, when the second amount is selected, causes the second amount of flush water to be discharged by switching the holding mechanism to the non-holding state before a water level in a storage tank drops to a predetermined water level.

A flushometer system includes a pressure vessel with a flow path defined between a valve inlet chamber and an outlet and a valve assembly disposed within the pressure vessel and configured to selectively open and close the flow path. A primary diaphragm assembly is disposed within the pressure vessel and includes a primary disc configured to be moveable to actuate the valve assembly to selectively open and close the flow path between the valve inlet chamber and the outlet, and a primary diaphragm connected to the primary disc. A secondary diaphragm assembly is disposed within the pressure vessel and includes a secondary diaphragm and a secondary disc, the secondary diaphragm assembly configured to actuate the primary diaphragm assembly by venting fluid pressure on one side of the primary diaphragm. An activation assembly is configured to actuate the secondary diaphragm assembly by venting fluid pressure on one side of the secondary diaphragm.

A pressure flushing system including a first container and a second container, and a communicating member that communicates with the first container and the second container; the first container is formed with a first water inlet and a drain, water flows into the first container from the first water inlet, and water in the second container flows in from the first container by means of the communicating member; gas in the first container and the second container is gradually compressed and stored in an upper part of the second container during a water intake process, and the compressed gas pushes the water in the first container and the second container to be discharged from the drain when draining. The present invention solves the disadvantages of the large volume and inconvenient installation of pressure water tank that have existing structures, and has the characteristics of a small volume and flexible installation.

A fill valve system with a float nested in a container connected to the fill valve and a siphon device passing water out of the container into the toilet tank, with the siphon device having an air vent dimensioned such that: (i) tank refilling is delayed until after the flush valve closes; (ii) the fill valve is not turned on by small leaks in the tank; and (iii) the fill valve turns off when it encounters large leaks in the tank.