TW202040062A - Gas valve and its control device and control method wherein the gas valve has the function of turning off the gas at fixed time - Google Patents

Abstract

The present invention relates to a gas valve and its control device and control method, wherein the control device receives a voltage generated by a thermocouple, and outputs a first voltage and a second voltage when the voltage generated by the thermocouple is greater than a predetermined voltage. After receiving a turn-off signal, the control device stops outputting the first voltage and starts counting time. When the counted time reaches a predetermined time, it stops outputting the second voltage. The gas valve includes a valve body, a main fire solenoid valve and a mother fire solenoid valve. The valve body has a main fire gas passage and a mother fire gas passage, and the valve body is provided with a first control terminal and a second control terminal. The first control terminal and the second control terminal are respectively electrically connected to the main fire solenoid valve and the mother fire solenoid valve. The main fire solenoid valve receives a first voltage via the first control terminal to open the main fire gas passage. After the first voltage is released, the main fire solenoid valve closes the main fire gas passage. The mother fire solenoid valve receives a second voltage through the second control terminal to open the mother fire gas passage. After the second voltage is released, the mother fire solenoid valve closes the mother fire gas passage. The control device includes a first output terminal connected to the first control terminal; a second output terminal connected to the second control terminal; a first input terminal connected to the thermocouple for receiving the voltage generated by the thermocouple; a second input terminal connected to a main fire control switch for receiving a turn-off signal generated by the main fire control switch; and a controller electrically connected to the first output terminal, the second output terminal, the first input terminal and the second input terminal.

Description

Gas valve and its control device and control method

The invention relates to a gas valve; in particular, it refers to a gas valve with the function of timing off the gas and its control device and control method.

It is known that the conventional gas fireplace is used to burn the gas to generate heat energy and increase the indoor temperature. Figure 1 is a conventional gas fireplace combustion control assembly, which includes a gas valve 1, an ignition electrode 9, an ignition switch 11a, an ignition circuit 11b, a main fire burner 13a, a mother flame burner 13b, a The thermocouple 15 and a main fire control switch 17, wherein the gas valve 1 has a valve body 1a, the valve body 1a has a main fire gas passage 5a and a mother fire gas passage 5b, the valve body 1a is provided with a main fire solenoid The valve 3a and a mother fire solenoid valve 3b are respectively located in the main fire gas passage 5a and the mother fire gas passage 5b. A flow regulating valve 7 is provided on the valve body 1a, and the flow regulating valve 7 is used to control the opening of the main fire gas passage 5a and to activate the main fire solenoid valve 3b with the ejector rod. When the user touches the flow control valve 7, the flow control valve 7 uses the ejector rod to push the mother fire solenoid valve 3b to open the mother fire gas passage 5b, so that the gas flows from the gas source to the mother fire burner 13b through the mother fire gas passage 5b , The user touches the ignition switch 11a, and the ignition switch 11a causes the ignition circuit 11b to output a high voltage to the ignition electrode 9 to ignite, so as to ignite the gas output by the mother fire burner 13b to form a mother fire. The thermocouple 15 detects the flame of the mother fire and outputs a detection voltage to the mother fire solenoid valve 3b. When the detection voltage rises to a predetermined voltage value, the mother fire solenoid valve 3b is magnetized and opened. At this time, when the main fire control switch 17 is turned on, the detection voltage is also supplied to the main fire solenoid valve 3a, so that the main fire gas passage 5a is opened to supply gas to the main fire burner 13a, the main fire burner 13a The output gas is ignited by the mother fire to form the main fire for heating.

When the user wants to turn off the main fire, he only needs to turn off the main fire control switch 17 to block the detection voltage conducted to the main fire solenoid valve 3a, so that the main fire solenoid valve 3a closes the main fire gas passage 5a.

In order to facilitate the next ignition of the main fire and because it is not easy to ignite the main fire in low temperature areas, the conventional gas fireplace does not extinguish the main fire after the main fire is turned off, but keeps the main fire burning. However, the design of such a gas fireplace to keep the mother fire burning not only wastes energy, but also has safety concerns.

In view of this, the object of the present invention is to provide a gas valve and its control device and control method, which can turn off the main fire regularly after a predetermined time after the main fire is turned off.

In order to achieve the above objective, the present invention provides a gas valve control device, wherein the gas valve includes a valve body, a main fire solenoid valve and a mother fire solenoid valve, and the valve body has a main fire gas passage and a mother fire solenoid valve. A fire gas passage, and the valve body is provided with a first control terminal and a second control terminal, the first control terminal and the second control terminal are respectively electrically connected to the main fire solenoid valve and the mother fire solenoid valve; The main fire solenoid valve receives a first voltage via the first control terminal to open the main fire gas passage. After the first voltage is released, the main fire solenoid valve closes the main fire gas passage; the mother fire solenoid valve passes through the The two control terminals receive a second voltage to open the mother fire gas passage, and after the second voltage is released, the mother fire solenoid valve closes the mother fire gas passage;

The control device includes a first output terminal, a second output terminal, a first input terminal, a second input terminal, and a controller, wherein the first output terminal is connected to the first control terminal, and the second output The terminal is connected to the second control terminal, the first input terminal is connected to a thermocouple to receive the voltage generated by the thermocouple, and the second input terminal is connected to a main fire control switch to receive the main fire control switch. Generates a fire-off signal, the controller is electrically connected to the first output terminal, the second output terminal, the first input terminal, and the second input terminal; the controller receives the voltage at the first input terminal When the voltage is greater than a predetermined voltage, output the second voltage to the second output terminal and output the first voltage to the first output terminal; after the controller receives the switch-off signal at the second input terminal, the controller Stop outputting the first voltage to the first output terminal, and the controller starts timing. When the time counted reaches a predetermined time, the controller stops outputting the second voltage to the second output terminal.

The present invention also provides a gas valve including a valve body, a main fire solenoid valve and a mother fire solenoid valve, wherein the valve body has a main fire gas passage and a mother fire gas passage, and the main fire solenoid valve is arranged on the The valve body is used to receive a first voltage to open the main fire gas passage. After the first voltage is released, the main fire solenoid valve closes the main fire gas passage. The mother fire solenoid valve is arranged on the valve body and used for Receiving a second voltage to open the mother fire gas passage, after the second voltage is released, the mother fire solenoid valve closes the mother fire gas passage, characterized in that it further comprises a control device, the control device comprising a first input Terminal, a second input terminal and a controller, wherein the first input terminal is connected to a thermocouple to receive the voltage generated by the thermocouple; the second input terminal is connected to a main fire control switch to receive the main A fire off signal generated by a fire control switch; the controller is electrically connected to the main fire solenoid valve, the main fire solenoid valve, the first input terminal and the second input terminal; the controller is connected to the first input terminal When the received voltage is greater than a predetermined voltage, output the second voltage to the main fire solenoid valve and output the first voltage to the main fire solenoid valve; the controller receives the fire off signal at the second input terminal , The controller stops outputting the first voltage to the main fire solenoid valve, and the controller starts timing, when the time counted reaches a predetermined time, the controller stops outputting the second voltage to the main fire solenoid valve

The present invention provides a method for controlling a gas valve, wherein the gas valve includes a valve body, a main flame solenoid valve and a mother flame solenoid valve, the valve body has a main flame gas passage and a mother flame gas passage, the The main fire solenoid valve is arranged on the valve body and used to receive a first voltage to open the main fire gas passage. After the first voltage is released, the main fire solenoid valve closes the main fire gas passage; the main fire solenoid valve is set The valve body is used to receive a second voltage to open the mother fire gas passage. After the second voltage is released, the mother fire solenoid valve closes the mother fire gas passage; the control method is executed by a control device including The following steps:

Receive a voltage generated by a thermocouple, and when the voltage generated by the thermocouple is greater than a predetermined voltage, output the second voltage and output the first voltage; after receiving a fire signal, stop outputting the first voltage , And start timing, when the counted time reaches a predetermined time, stop outputting the second voltage.

The effect of the present invention is that after the main fire gas passage is closed, the controller automatically closes the mother fire gas passage to stop the mother fire after a set predetermined time has elapsed. In this way, not only can the continuous combustion of the mother fire cause energy The waste can also avoid accidents such as fires.

In order to explain the present invention more clearly, a few preferred embodiments are listed below in detail in conjunction with the drawings. Please refer to Figure 2 for the gas valve 100 and the control device 200 of the first preferred embodiment of the present invention. The gas valve 100 and the control device 200 in this embodiment are used in a fireplace, but it is not limited to this, and can be any Gas heating device.

As shown in Figure 2, the gas valve 100 includes a valve body 10, a main fire solenoid valve 12a, and a mother fire solenoid valve 12b. The valve body 10 has a main fire gas passage 10a and a mother fire gas passage 10b. The passage 10a and the main fire gas passage 10b are connected to the same gas source. The main fire gas passage 10a is connected to a main fire burner 14a at the end far away from the gas source, and the main fire gas passage 10b is connected to a mother fire at the end far away from the gas source. The burner 14b, the main fire solenoid valve 12a is arranged at the position between the gas source on the main fire gas passage 10a and the main fire burner 14a, the mother fire solenoid valve 12b is arranged on the gas source and the mother fire on the mother fire gas passage 10b The position between the burners 14b, the main fire solenoid valve 12a and the mother fire solenoid valve 12b in this embodiment are normally closed solenoid valves, which are opened or closed by voltage control. When the solenoid valve is opened, gas is passed through , When the solenoid valve is closed, the gas is blocked. The valve body 10 is provided with a first control terminal 11a and a second control terminal 11b. The first control terminal 11a and the second control terminal 11b are electrically connected to the main fire solenoid valve 12a and the master fire solenoid valve 12b, respectively. The valve 12a receives a first voltage via the first control terminal 11a to open the main fire gas passage 10a. The first voltage is a high potential. When the first voltage is released, the voltage drops to a low potential, and the main fire solenoid valve 12a is closed The main fire gas passage 10a; the master fire solenoid valve 12b receives a second voltage through the second control terminal 11b to open the master fire gas passage 10b, the second voltage is a high potential, and the voltage drops after the second voltage is released To a low potential, the mother fire solenoid valve 12b closes the mother fire gas passage 10b.

The valve body 10 is further provided with a flow regulating valve 16 for the user to rotate to adjust the main fire gas passage 10a. The flow regulating valve 16 has a push rod (not shown) for opening the mother flame solenoid valve 12b to open the mother flame The gas passage 10b allows gas to circulate to the mother fire burner 14b through the mother fire gas passage 10b. When the flow regulating valve 16 rotates, an ignition switch 18 is activated. In other embodiments, the ignition switch 18 can also be pressed by the user When the ignition switch 18 is activated, the ignition circuit 20 is triggered to output a high voltage to the ignition electrode 22, so that the ignition electrode 22 generates a spark and ignites the mother fire burner 14b to ignite the gas flowing to the mother fire burner 14b, and then The mother fire burner 14b generates flames. A thermocouple 24 is provided next to the mother fire burner 14b to detect the flame and output a corresponding detection voltage. After the detection voltage gradually rises to a predetermined voltage value, the mother fire The solenoid valve will remain magnetized and open. At this time, the user releases the flow regulating valve 16, and the main flame solenoid valve 12b remains open.

The control device 200 includes a first output terminal 30a, a second output terminal 30b, a first input terminal 32a, a second input terminal 32b, and a controller 34. The controller 34 is a microcontroller (MCU). Connect the first output terminal 30a, the second output terminal 30b, the first input terminal 32a and the second input terminal 32b, the first output terminal 30a is connected to the first control terminal 11a, and the second output terminal 30b is connected to the second control Terminal 11b, the first input terminal 32a is connected to a thermocouple 24, and the second input terminal 32b is connected to a main fire control switch 26; when the detection voltage of the thermocouple 24 output to the first input terminal 32a continues to rise to a predetermined voltage, the control The device 34 uses the power supplied by the thermocouple 24 to operate, and the controller 34 outputs a second voltage to the second output terminal 30b, and the master flame solenoid valve 12b receives the second voltage through the second control terminal 11b to make the master flame gas channel 10b Keep on, and the controller 34 also outputs the first voltage to the first output terminal 30a at the same time, the main fire solenoid valve 12a receives the first voltage through the first control terminal 11a and opens, so that the gas circulates to the main fire through the main fire gas passage 10a The burner 14a is ignited by the flame of the main fire burner 14b to ignite the gas 14a circulating to the main fire burner, and then the main fire burner 14a generates flame. In addition, the control device 200 can be combined with the valve body 10.

In this embodiment, when the user touches the main fire control switch 26, a fire off signal is generated. After the controller 34 receives the fire off signal at the second input terminal 32b, the controller 34 stops outputting the first voltage to the first The output terminal 30a causes the main fire solenoid valve 12a to close the main fire gas channel 10a, and the controller 34 starts timing. When the time counted reaches a predetermined time, the controller 34 stops outputting the second voltage to the second output The terminal 30b enables the main flame solenoid valve 12b to close the main flame gas passage 10b, thereby extinguishing the main flame. In this embodiment, the predetermined time is seven days, which means that the main flame solenoid valve 12a closes the main flame gas passage 10a for seven days. The controller 34 controls the master flame solenoid valve 12b to close the master flame gas passage 10b.

However, after the main fire solenoid valve 12a closes the main fire gas passage 10a, before the time counted by the controller 34 has not reached the predetermined time, the user touches the main fire control switch 26 to generate a fire signal. After the second input terminal 32b receives the fire signal, the controller 34 stops timing and outputs the first voltage to the first output terminal 30a. The main fire solenoid valve 12a receives the first voltage through the first control terminal 11a and opens, so that the gas The gas circulates through the main fire gas passage 10a to the main fire burner 14a, and is ignited by the flame of the main fire burner 14b to ignite the gas flowing to the main fire burner 14a, thereby causing the main fire burner 14a to generate flames.

In this embodiment, the control device 200 further includes a master fire indicator lamp 36, which is electrically connected to the controller 34. When the controller 34 outputs the second voltage to the second output terminal 30b, the controller 34 The master fire indicator 36 is lit, and when the time counted by the controller 34 reaches the predetermined time, the master fire indicator 36 is turned off. The master fire indicator 36 may be an LED light, which can be set for the user to easily see At the location, the user can know the current state of the mother fire by turning on or off the mother fire indicator 36.

With the above-mentioned structure of the gas valve 100 and the control device 200, the gas valve control method of this embodiment can be implemented. The control method includes the following steps as shown in FIG. 3:

First, in step S1, a voltage generated by a thermocouple is received, and when the voltage generated by the thermocouple is greater than a predetermined voltage, the second voltage is outputted and the user ignites the flame. In this embodiment, the controller 34 receives the detection voltage output by the thermocouple 24. When the detection voltage is greater than the predetermined voltage, the controller 34 uses the power supplied by the thermocouple 24 to operate, and the controller 34 outputs the second The voltage is applied to the main fire solenoid valve 12b to keep the main fire gas passage 10b open, and the first voltage is output to the main fire solenoid valve 12a to open the main fire gas passage 10a and the main fire is ignited.

In step S2, after receiving a fire-off signal, stop outputting the first voltage and start timing, and stop outputting the second voltage when the counted time reaches a predetermined time. In this embodiment, the user touches the main fire control switch 26, and the main fire control switch 26 outputs a fire off signal to the controller 34. After receiving a fire off signal, the controller 34 stops outputting the first voltage to the main fire solenoid valve 12a, the main fire gas passage 10a is closed and the main fire is extinguished. At the same time, the controller 34 starts timing. When the time counted reaches a predetermined time, it stops outputting the second voltage to the mother fire solenoid valve 12b to make the mother fire gas passage 10b is closed and the main fire is extinguished.

In step S1, it further includes that when the controller 34 outputs the second voltage, the controller 34 controls a flame indicator 36 to turn on; in step S2, it further includes that when the time counted by the controller 34 reaches the predetermined time , Control the main fire indicator 36 to go out.

In this embodiment, before the time counted by the controller 34 has reached the predetermined time, the user touches the main fire control switch 26, the main fire control switch 26 outputs a fire signal to the controller 34, and the controller 34 receives After the fire signal is reached, the timing is stopped and the first voltage is output to the main fire solenoid valve 12a to open the main fire gas passage 10a.

In this way, when the predetermined time arrives, the controller automatically closes the main fire gas channel to stop the main fire. In this way, not only can the main fire continue to burn and cause energy waste, but also can avoid accidents such as fire.

Please refer to FIG. 4 for the gas valve 300 and control device 400 of the second preferred embodiment of the present invention, the gas valve 300 and control device 400 in this embodiment and the gas valve 100 and control device 200 of the first preferred embodiment described above The structure is roughly the same. The difference is that the ignition switch 18 and the ignition circuit 20 are electrically connected to the controller 34, and the controller 34 is electrically connected to a power source P (such as direct current or battery). Before ignition, the controller 34 operates with the power supplied by the power supply P. When the user turns the flow control valve 16 to the ignition position, the parent flame solenoid valve 12b is opened to open the parent flame gas passage 12b and at the same time the ignition switch 18 is activated to make the ignition switch 18 Output an ignition signal to the controller 34. After receiving the ignition signal, the controller 34 triggers the ignition circuit 20 to output a high voltage to the ignition electrode 22, so that the ignition electrode 22 generates sparks, and the controller 34 simultaneously outputs a second voltage to the second output terminal 30b, and maintain the output of the second voltage, the mother fire solenoid valve 12b receives the second voltage through the second control terminal 11b _, so that the mother fire gas passage 10b remains open, at this time the user releases the flow control valve 16, the mother fire solenoid valve 12b remains open.

The control method of the gas valve of this embodiment can also use the steps of the first embodiment. The difference is that before the controller 34 receives the voltage of the thermocouple 24, the controller 34 uses the power supplied by the power supply P to operate To output the second voltage; after the voltage generated by the thermocouple 24 is greater than the predetermined voltage, the controller 24 switches to use the power of the thermocouple 24 to output the second voltage and the first voltage, instead of using The power supplied by the power supply P is used until the voltage generated by the thermocouple 24 is less than the predetermined voltage.

Please refer to FIG. 5 for a gas valve 500 of a third preferred embodiment of the present invention. The difference from the first embodiment is that in this embodiment, the control device 60 is integrated into the valve body 10 of the gas valve 500, that is, The gas valve 500 includes a valve body 10 and a control device 60, and the controller 34 is directly electrically connected to the main fire solenoid valve 12a and the main fire solenoid valve 12b, and the controller 34 is not connected to the second control terminal 11b through the first control terminal 11 The main fire solenoid valve 12a and the main fire solenoid valve 12b. The controller 34 outputs the second voltage to the main fire solenoid valve 12b and the first voltage to the main fire when the voltage received by the first input terminal 32a is greater than the predetermined voltage The solenoid valve 12a.

The control method of the gas valve 500 of this embodiment can also use the steps of the first embodiment.

In summary, for the gas valve and its control device and control method of the present invention, when the main fire gas passage 10a is closed, the user can customize a predetermined time. When the predetermined time is reached, the controller 34 automatically closes the valve. The fire and gas passage 10b not only avoids the waste of energy, but also avoids accidents such as fire, and improves the safety of the user in using the gas valve

The above are only the preferred and feasible embodiments of the present invention. Any equivalent changes made by applying the specification of the present invention and the scope of the patent application should be included in the patent scope of the present invention.

[Traditional] 1: Gas valve 1a: Valve body 3a: Main fire solenoid valve 3b: Main fire solenoid valve 5a: Main fire gas channel 5b: Main fire gas channel 7: Flow control valve 9: Ignition electrode 11a: ignition switch 11b: ignition circuit 13a: Main fire burner 13b: Main fire burner 15: Thermocouple 17: Main fire control switch [this invention] 100: Gas valve 10: Valve body 10a: Main fire gas passage 10b: Main fire gas passage 11a: First control terminal 11b: Second control terminal 12a: Main fire solenoid valve 12b: Main fire solenoid valve 14a: Main fire burner 14b: Main fire burner 16: Flow control valve 18: Ignition switch 20: Ignition circuit 22: Ignition electrode 24: Thermocouple 26: Main fire control switch 200: control device 30a: first output terminal 30b: second output terminal 32a: first input terminal 32b: second input terminal 34: Controller 36: Mother fire indicator 300: Gas valve 400: control device 500: Gas valve 60: control device P: Power

Figure 1 is a schematic diagram of a conventional gas fireplace. Figure 2 is a schematic diagram of the gas valve and its control device in the first preferred embodiment of the present invention. Figure 3 is a flow chart of the control method of the first preferred embodiment of the present invention. Figure 4 is a schematic diagram of a gas valve and its control device according to a second preferred embodiment of the present invention. Figure 5 is a schematic diagram of a gas valve and its control device according to a third preferred embodiment of the present invention.

100: Gas valve

10: Valve body

10a: Main fire gas channel

10b: Mother fire gas channel

11a: The first control terminal

11b: Second control terminal

12a: Main fire solenoid valve

12b: Mother fire solenoid valve

14a: Main fire burner

14b: Mother fire burner

16: Flow control valve

18: Ignition switch

20: Ignition circuit

22: ignition electrode

24: Thermocouple

26: Main fire control switch

200: control device

30a: The first output terminal

30b: Second output terminal

32a: The first input terminal

32b: second input terminal

34: Controller

36: Mother fire indicator

Claims (11)

A control device for a gas valve, wherein the gas valve includes a valve body, a main fire solenoid valve and a mother fire solenoid valve, the valve body has a main fire gas passage and a mother fire gas passage, and the valve body is provided There is a first control terminal and a second control terminal. The first control terminal and the second control terminal are respectively electrically connected to the main fire solenoid valve and the mother fire solenoid valve; the main fire solenoid valve passes through the first control terminal Receive a first voltage to open the main fire gas passage, after the first voltage is released, the main fire solenoid valve closes the main fire gas passage; the mother fire solenoid valve receives a second voltage through the second control terminal and opens For the mother fire gas passage, after the second voltage is released, the mother fire solenoid valve closes the mother fire gas passage; the control device includes: A first output terminal for connecting to the first control terminal; A second output terminal for connecting to the second control terminal; A first input terminal for connecting a thermocouple to receive the voltage generated by the thermocouple; A second input terminal for connecting a main fire control switch to receive a fire off signal generated by the main fire control switch; A controller is electrically connected to the first output terminal, the second output terminal, the first input terminal, and the second input terminal; when the voltage received by the first input terminal is greater than a predetermined voltage, the controller Output the second voltage to the second output terminal, and output the first voltage to the first output terminal; after the controller receives the switch-off signal at the second input terminal, the controller stops outputting the first voltage To the first output terminal and the controller starts timing. When the time counted reaches a predetermined time, the controller stops outputting the second voltage to the second output terminal. The control device of the gas valve according to claim 1, including a master fire indicator light, which is electrically connected to the controller, and when the controller outputs the second voltage to the second output terminal, the master fire indicator light is turned on On; when the time counted by the controller reaches the predetermined time, it controls the main flame indicator to go out. The control device for a gas valve according to claim 1, wherein the second input terminal is further used to receive a fire signal generated by the main fire control switch; wherein the time counted by the controller has not reached the predetermined time before After the second input terminal receives the fire signal, the controller stops timing and outputs the first voltage to the first output terminal. A gas valve including: A valve body with a main fire gas passage and a mother fire gas passage; A main fire solenoid valve arranged on the valve body and used to receive a first voltage to open the main fire gas passage; after the first voltage is released, the main fire solenoid valve closes the main fire gas passage; A mother fire solenoid valve arranged on the valve body and used to receive a second voltage to open the mother fire gas passage; after the second voltage is released, the mother fire solenoid valve closes the mother fire gas passage; It is characterized in that it further comprises a control device, and the control device includes: A first input terminal for connecting a thermocouple to receive the voltage generated by the thermocouple; A second input terminal for connecting a main fire control switch to receive a fire off signal generated by the main fire control switch; A controller electrically connected to the main fire solenoid valve, the mother fire solenoid valve, the first input terminal and the second input terminal; when the voltage received by the first input terminal is greater than a predetermined voltage, the controller Output the second voltage to the main fire solenoid valve and output the first voltage to the main fire solenoid valve; after the controller receives the shut-off signal at the second input terminal, the controller stops outputting the first voltage To the main fire solenoid valve, and the controller starts timing, when the time counted reaches a predetermined time, the controller stops outputting the second voltage to the main fire solenoid valve. The gas valve according to claim 4, wherein the control device is coupled to the valve body. For the gas valve according to claim 4, the control device further includes a master fire indicator, which is electrically connected to the controller, and the controller controls the master fire indicator when outputting the second voltage to the master fire solenoid valve The lamp is on; when the time counted reaches the predetermined time, the controller controls the main flame indicator to go out. The gas valve according to claim 4, wherein the second input terminal is further used to receive a fire signal generated by the main fire control switch; wherein the time counted by the controller has not reached the predetermined time before the first After the two input terminals receive the fire signal, the controller stops timing and outputs the first voltage to the main fire solenoid valve. A method for controlling a gas valve, wherein the gas valve comprises a valve body, a main fire solenoid valve and a mother fire solenoid valve, the valve body has a main fire gas passage and a mother fire gas passage, and the main fire solenoid valve is provided The valve body is used to receive a first voltage to open the main fire gas passage. After the first voltage is released, the main fire solenoid valve closes the main fire gas passage; the mother fire solenoid valve is arranged on the valve body and Used to receive a second voltage to open the mother fire gas passage, after the second voltage is released, the mother fire solenoid valve closes the mother fire gas passage; the control method executed by a controller includes the following steps: The controller receives a voltage generated by a thermocouple, and when the voltage generated by the thermocouple is greater than a predetermined voltage, outputs the second voltage and outputs the first voltage; After receiving a fire-off signal, the controller stops outputting the first voltage and starts timing, and stops outputting the second voltage when the counted time reaches a predetermined time. According to the control method of the gas valve of claim 8, wherein when the second voltage is output, a mother fire indicator is controlled to light up; when the time counted reaches the predetermined time, the mother fire indicator is controlled to go out. As described in claim 9, the control method of the gas valve further includes stopping the timing and outputting the first voltage after receiving a fire signal before the time counted has reached the predetermined time. The control method of the gas valve according to claim 9, wherein the control method further comprises: before the controller receives the voltage of the thermocouple, the controller uses power supplied by a power source and outputs the second voltage; After the voltage generated by the thermocouple is greater than the predetermined voltage, the controller uses the power of the thermocouple to output the second voltage and the first voltage.

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