Disclosed is a water stop valve. A water inlet channel, a water outlet channel, and a water sealing surface are formed in a valve body. A valve stem has a middle portion movably disposed in the valve body and a lower portion mounted in a back-pressure hole of a water-plugging stopper. A back-pressure cavity is formed above the water-plugging stopper. A sealing end surface matching the back-pressure hole is formed on the valve stem. When in use, the valve stem drives the water plugging stopper to move downwards, the sealing end surface blocks the back-pressure hole, and the water plugging stopper blocks the water sealing surface, such that the water enters the back-pressure cavity, and the water pressure enables the water-plugging stopper to block the water sealing surface to stop the water. The water stop valve stops a water inlet valve from feeding in water in a timely manner.

Disclosed is a water stop valve. A water inlet channel, a water outlet channel, and a water sealing surface are formed in a valve body. A valve stem has a middle portion movably disposed in the valve body and a lower portion mounted in a back-pressure hole of a water-plugging stopper. A back-pressure cavity is formed above the water-plugging stopper. A sealing end surface matching the back-pressure hole is formed on the valve stem. When in use, the valve stem drives the water plugging stopper to move downwards, the sealing end surface blocks the back-pressure hole, and the water plugging stopper blocks the water sealing surface, such that the water enters the back-pressure cavity, and the water pressure enables the water-plugging stopper to block the water sealing surface to stop the water. The water stop valve stops a water inlet valve from feeding in water in a timely manner.

A vacuum pump for use with a siphon system to continuously purge gases that accumulate in a high point of the siphon system, or for priming the inlet to a pump, or to create vacuum for another purpose. Siphon systems require regular purging of gases when operating for long periods of time. The vacuum pump provides a mechanism that operates in a cycling manner. A first stage of the cycle involves filling a chamber using a pressurised liquid supply, and purging all gases from the chamber. A second stage involves isolating the chamber from the surrounding environment, and then allowing the liquid in the chamber to drain into the siphon system, while at the same time gases from within the siphon system are allowed to enter the chamber. Once the liquid has drained from the chamber, the chamber is isolated from the siphon system, and the liquid filling stage is repeated. Continual cycling of this process can purge the siphon system of gases, or be used to produce a vacuum for other purposes.

A vacuum pump for use with a siphon system to continuously purge gases that accumulate in a high point of the siphon system, or for priming the inlet to a pump, or to create vacuum for another purpose. Siphon systems require regular purging of gases when operating for long periods of time. The vacuum pump provides a mechanism that operates in a cycling manner. A first stage of the cycle involves filling a chamber using a pressurised liquid supply, and purging all gases from the chamber. A second stage involves isolating the chamber from the surrounding environment, and then allowing the liquid in the chamber to drain into the siphon system, while at the same time gases from within the siphon system are allowed to enter the chamber. Once the liquid has drained from the chamber, the chamber is isolated from the siphon system, and the liquid filling stage is repeated. Continual cycling of this process can purge the siphon system of gases, or be used to produce a vacuum for other purposes.

A fill valve for receiving a fluid flow includes a lower pipe and a flow restrictor cartridge. The flow restrictor cartridge is received in the lower pipe. The flow restrictor cartridge receives the fluid flow at a first fluid flow rate and provides the fluid flow as a second fluid flow rate lower than the first fluid flow rate. The flow restrictor cartridge includes a receiver and a compact flow restrictor. The compact flow restrictor is received by the receiver. The compact flow restrictor is configured to facilitate the reduction from the first fluid flow rate to the second fluid flow rate.

An opening/closing device according to the present invention includes a gate, a fall prevention unit, a support release unit, a first float, a floating prevention unit, a second float, and a floating prevention release unit. The gate receives a flow of fluid, and is able to fall down toward a downstream direction of the flow. The fall prevention unit supports the gate, thereby preventing the gate from falling down. The support release unit releases the support for the gate by the fall prevention unit. The first float is arranged on an upstream side of the gate, is arranged on one of the left side and the right side of the gate viewed from upstream, and is less in the specific gravity than the fluid. The floating prevention unit prevents the first float from floating.

An opening/closing device according to the present invention includes a gate, a fall prevention unit, a support release unit, a first float, a floating prevention unit, a second float, and a floating prevention release unit. The gate receives a flow of fluid, and is able to fall down toward a downstream direction of the flow. The fall prevention unit supports the gate, thereby preventing the gate from falling down. The support release unit releases the support for the gate by the fall prevention unit. The first float is arranged on an upstream side of the gate, is arranged on one of the left side and the right side of the gate viewed from upstream, and is less in the specific gravity than the fluid. The floating prevention unit prevents the first float from floating.

A fuel shutoff valve includes a valve, a float, and an auxiliary member. The valve is configured to open or close an air passage of a fuel tank. The float floats on fuel and moves in a valve closing direction to close the valve, or in a valve opening direction opposite to the valve closing direction to open the valve. The auxiliary member has a predetermined weight, and abuts on the float to apply a weight on the float in the valve opening direction, or separating from the float not to apply the weight on the float in the valve closing direction.

The present invention proposes a valve assembly for controlling a fluid to flow only in a certain direction according to inclination directions. A valve body 10 of the valve assembly includes a partition 14 formed with a through hole 14a and dividing an inside into a first internal channel 18a and a second internal channel 18b, a first entrance 12a for supplying a fluid from the first internal channel to an outside or a fluid from the outside to the first internal channel, and a second entrance 12b for supplying a fluid from the second internal channel to an outside or a fluid from the outside to the second internal channel. Further, a first check roller 11a and a second check roller 11b are in close contact with or separated from the through hole by buoyancy or sedimentation according to inclination directions of the valve body, thereby controlling the fluid to flow in a certain direction. Further, the first check roller and the second check roller are prevented from being in contact with the first entrance and the second entrance by the flow of the fluid in the first internal channel and the second internal channel, and the flow of the fluid is accurately controlled by only the inclination directions.

A fully-integrated, flow-control module for top-fill fuel tanks operates with a fuel line attached that supplies fuel under pulsating pressure. There are two bleed paths in the module, which open and close sequentially in response to the position of a fuel float within the module. In order for a main valve plunger, which controls fuel entry into the tank, to fully close, both bleed paths must be closed. A first bleed path closes first, followed by closure of the second. For the main valve plunger to fully open, both bleed paths must be open. The second bleed path opens first. Movement of the main valve plunger is controlled by both a biasing spring and pressure beneath the plunger. Pressure beneath the plunger builds up to a level sufficient for the biasing spring to fully close the plunger against a valve seat when both bleed paths are closed.