Handheld hookah

1. A hookah, comprising a gas valve assembly comprising a gas valve and a central shaft;

wherein:

the gas valve comprises a first air duct and a second air duct the central shaft comprises a third air duct and a fourth air duct the first air duct and the second air duct each comprises a first end and a second end;

when in use, the hookah is placed vertically and added with water, a liquid level of the water is lower than that of the first end of the second air duct, and higher than that of the second end of the first air duct;

the first end of the first air duct is connected to the third air duct so that smoke goes into the first air duct from the third air duct;

the second end of the first air duct is disposed in the water so that the smoke is filtered through the water;

the first end of the second air duct is disposed above the liquid level of the water so that the filtered smoke enters the second air duct;

the second end of the second air duct is connected to the fourth air duct through which the smoke is discharged to a cigarette holder for user's inhaling;

the gas valve is disposed on the central shaft and is rotatable around a central line of the central shaft the gas valve comprises a first side and a second side, and the first side is heavier than the second side; the first air duct communicates with the first side, and the second air duct communicates with the second side; the third air duct and the fourth air duct of the central shaft are separated from each other; and

the gas valve is connected to the central shaft via a bearing assembly; the bearing assembly is rotatable around the central axial of the central shaft to drive the gas valve to rotate.

2. The hookah of claim 1 , wherein the bearing assembly comprises a first bearing, a first sleeve, and a second bearing; the first bearing and the second bearing are respectively disposed on the central shaft; the first sleeve is configured to receive the first bearing and the second bearing; the valve is disposed on the first sleeve.

3. The hookah of claim 2 , wherein the gas valve assembly further comprises a circlip, an upper seal ring and a low seal ring; the circlip is disposed on a top of the first sleeve; the upper seal ring and the low seal ring are respectively disposed on both ends of the central shaft so as to prevent gas leakage from the central shaft.

4. The hookah of claim 3 , wherein the hookah further comprises a cylindrical glass tube.

5. The hookah of claim 3 , wherein the hookah further comprises an electromagnetic induction heater; the electromagnetic induction heater comprises a conductive container and a plurality of electromagnetic coils; the plurality of electromagnetic coils is disposed coaxially around the conductive container so that when the plurality of electromagnetic coils is electrified, the conductive container produces heat through electromagnetic induction to heat a smoking material placed in the conductive container.

6. The hookah of claim 5 , wherein the hookah further comprises a gas regulating assembly; the gas regulating assembly comprises a third seal ring and a fixed base; the third seal ring comprises a first hole, and the fixed base comprises a second hole; the third seal ring is configured to rotate such that the first hole can be aligned with the second hole for regulating a volume of airflow.

7. The hookah of claim 5 , wherein the electromagnetic induction heater further comprises a third sleeve, a cover, and a ceramic cup; the cover is disposed on the conductive container; the conductive container with the cover is disposed in the ceramic cup, and the third sleeve is configured to receive the plurality of electromagnetic coil, so as to prevent short circuit due to a direct contact of the conductive container and the plurality of electromagnetic coil.

8. The hookah of claim 7 , wherein the electromagnetic induction heater further comprises a temperature sensor disposed in a bottom of the ceramic cup; the temperature sensor is configured to transmit a request for a decrease of an output power when a preset temperature is detected in the conductive container.

9. The hookah of claim 8 , wherein the electromagnetic induction heater further comprises a set screw, a control board, and a battery cell; an output terminal of the battery cell is connected to an input terminal of the control board; an output terminal of the control board is secured to an input terminal of the plurality of electromagnetic coils via a set screw so as to supply electric power to the plurality of electromagnetic coil.

10. The hookah of claim 3 , wherein the hookah further comprises a gas regulating assembly; the gas regulating assembly comprises a third seal ring and a fixed base; the third seal ring comprises a first hole, and the fixed base comprises a second hole; the third seal ring is rotated until the first hole is aligned with the second hole to regulate a volume of airflow.

11. The hookah of claim 10 , wherein the gas regulating assembly further comprises a fourth sleeve and a second seal ring; the third seal ring is disposed outside the fourth sleeve; the second seal ring is disposed between the fourth sleeve and the third seal ring to prevent air leakage; the fixed base is disposed in the fourth sleeve.