JPH01182683A - Valve gear - Google Patents

Abstract

PURPOSE:To keep off any counterflow and pulsation of fuel gas as well as to uniformize the mixing of air and the fuel gas by mixing the fuel gas with the air run past an air flow passage in utilizing a venturi effect. CONSTITUTION:A fuel gas flow passage 35, whose one end is opened to an air flow passage 14 as adjoining it, is formed in a valve gear 1 body being installed in various combustion apparatuses and so on. A first valve member 41 is interposed in the air flow passage 14 and a second valve member 61 in the fuel gas flow passage 35, respectively. Both these valve members 41, 61 are solidly driven into angular displacement by a synchronized driving means. Here fuel gas is inhaled in the air flow passage 14 owing to a venturi effect, and mixed with air running past.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a valve device that is installed in various types of combustion equipment and that is suitably used when mixing combustion gas and air.

BACKGROUND OF THE INVENTION Conventional technical commercial or everyday combustion appliances are provided with mixers for mixing fuel gas and air. Conventionally, such a warmer has an air flow path formed therein, and a fuel gas supply nozzle protrudingly provided in the air flow path. As a result, the fuel gas and air are mixed, and the mixed gas is fed under pressure to a combustion section such as a burner top, and the mixed gas is used as fuel.

Problems to be Solved by the Invention When high-load combustion is performed in a combustion device equipped with such a mixer, the flow rate of the mixed gas is extremely high, and therefore the degree of premixing becomes large.

F! where the flow velocity of such a mixed gas is high! Secondly, when the mixed gas is combusted, a loud combustion noise of, for example, more than 100 horns is generated.

In addition, near the supply nozzle, fuel gas remains when the fire is extinguished, and there is a field 6 where abnormal combustion occurs when the fire is re-ignited.

Furthermore, the combustion gas is injected under pressure into the air flow path by the supply nozzle. Therefore, when the air pressure in the air flow path becomes high, combustion gas may flow backward through the supply nozzle or pulsation of combustion gas may occur, resulting in incomplete combustion or misfire.

The purpose of the present invention is to solve the above-mentioned problems, to reduce combustion noise as much as possible, to prevent abnormal combustion from occurring at the time of re-ignition, and to prevent backflow of fuel gas. It is an object of the present invention to provide a valve device that can prevent incomplete combustion and has excellent operability.

Means for Solving the Problems The present invention provides a main body of a valve device, comprising an air passage passing through the main body, one end opening facing the outside of the main body, and the other end facing the air passage. Such a main body is formed with a fuel gas flow path that opens, and a first valve member that is angularly displaceable and is interposed in the air flow path, and has an air hole through which air passes when the valve is in a closed state. such a first valve member, a second valve member that is interposed in the fuel gas flow path and is angularly displaceable, and a connection drive means that integrally connects the first and second valve members and drives the angular displacement. A valve device characterized in that it includes:

Function According to the present invention, the main body of the valve device is provided with an air flow path through which air is fed under pressure, and a fuel gas flow path through which fuel gas is supplied. One end of the fuel gas flow path is open facing the air flow path, and fuel gas is supplied from the other end. As a result, fuel gas is drawn into the air flow path and mixed with the air flowing through the air flow path, ie due to the Venturi effect in hydrodynamics.

At this time, the fuel gas is mixed with the air passing through the air flow path due to the Venturi effect, so the fuel gas does not flow backward through the fuel gas flow path or pulsate, and the air does not mix with the air. The fuel gas is evenly mixed with the fuel gas.

Further, a first valve member is provided in the air flow path, and a second valve member is provided in the fuel gas flow path so as to be freely angularly displaceable. The first valve member and the second valve member are integrally coupled and driven for angular displacement by a coupling drive means. Therefore, there is no need to operate the first valve member and the second valve member separately, and the mixture ratio of fuel gas and air can be set to a predetermined value regardless of the flow rate, resulting in excellent operability. There is.

Furthermore, the first valve member is formed with an air hole through which air passes when the valve is closed. As a result, when the first valve member and the second valve member are in the closed state, the air passing through the air hole prevents fuel gas from remaining in the valve device.

Therefore, occurrence of abnormal combustion at the time of re-ignition is prevented.

Embodiment FIG. 1 shows a valve system r! of an embodiment of the present invention. 11, FIG. 2 is a sectional view taken from the section line ■-■ of 1I2I, and FIG. 3 is a sectional view taken from the section line ■-■ of FIG. FIG. 4 is an exploded perspective view of the valve arrangement W11.

The structure of the valve device 1 will be described with reference to FIGS. 1 to 4. The main body 2 of the valve assembly W11 is provided in the longitudinal direction of the main body 2 (
Insertion holes 3.4 having axes parallel to each other are provided along the left-right direction in FIG. 2).

A recess 5 having an inner diameter D2 larger than the inner diameter D1 of the insertion hole 3 is formed at one end of one of the insertion holes 3. recess 5
The axis coincides with the axis of the insertion hole 3. An insertion hole 6 having an axis perpendicular to the axis of the insertion hole 4 is provided near one end of the other insertion hole 4 . The insertion hole 6 is provided to pass through the insertion hole 4 and the recess 5. Furthermore, the insertion hole 4
An insertion hole 7 having an axis perpendicular to the axes of the insertion holes 4 and 6 is provided near one end thereof, and communicates with the insertion holes 4 and 6.

An insertion hole 8 having an axis perpendicular to the axis of the insertion hole 4 is provided near the other end of the insertion hole 4, and one end thereof is opened facing the outside of the main body 2 to form the insertion hole 3. A through hole 9.10 is provided, each with an axis perpendicular to the axis of .4. The insertion holes 9, 10 each communicate with the insertion hole 3.4.

In the recess 5 of the main body 2, there is an insert 1 having a generally right cylindrical shape.
1 is placed. The insert 11 is formed from a guide part 12 and a flange part 13. The inner diameter of the guide portion 12 of the insert 11 is selected to be approximately equal to the inner diameter of the insertion hole 3. Interpolator 1
The outer circumferential surface of the guide portion 12 is tapered and sloped smoothly toward the outside of the main body 2. The outer diameter of the flange portion 13 of the insert 11 is selected to be approximately equal to the inner diameter of the recess 5.

Furthermore, five approximately right cylindrical presser cylinders 15 are arranged in contact with the flange portion 13 of the insert 11.

This prevents the insert 11 from coming out of the recess 5 of the main body 2. In this way, the insertion hole 3 and the insert body 1
An air flow path 14 is formed by the inner circumferential surface of the first guide portion 12 .

The outer diameter of the presser cylinder 15 is selected to be approximately equal to the inner diameter of the recess 5. A notch 15a is provided on the side of the presser cylinder 15. The notch 15a is provided at a position corresponding to the insertion hole 6. The outer peripheral surface of the guide portion 12 of the insert 11 and the presser tube 1
An annular gap 16 is formed by the inner circumferential surface of the 5, and the gap 16 is open to the outside of the 5 main body 2 and facing the air flow path 14.

Furthermore, a socket 17 is placed in contact with the presser cylinder 15 with a packing 20 interposed therebetween. The socket 17 has a cylindrical portion 18
and a flange portion 19, and an internal thread 182t is formed on the inner surface of the cylindrical portion 18.

Furthermore, the inner peripheral surface of the socket 17 has an inclined surface 18b that slopes toward the vicinity of the inner peripheral surface of the presser tube 15. The socket 17 is fixed to the main body 2 by, for example, a bolt 21. At the other end of the insertion hole 3, a socket 22 consisting of a cylindrical portion 23 and a flange portion 24, like the socket 17, is arranged via a packing 25 and fixed to the main body 2 with, for example, bolts 26. An internal thread 23a is formed on the inner peripheral surface of the cylindrical portion 23 of the socket 22, and an inclined surface 23b is formed.
is provided.

Both ends of the insertion hole 4 are connected by plugs 30 and 31.
'Is done. Further, the end of the insertion hole 6 on the side surface 2a of the main body is closed by a plug 32. Furthermore, the insertion hole 7 is also closed by the one lug 33. As a result, a roughly crank-shaped fuel gas flow path 35 is formed by the insertion holes 8, 4.6. At this time, the insertion hole 6 and the recess 5 communicate with each other, and the notch 15a is formed in the portion of the presser cylinder 15 corresponding to the insertion hole 6, so that the fuel gas flow path 35 allows air to pass through the gap 16. It communicates with the flow path 14 . A nipple 36 is fixed to the end of the insertion hole 8 on the side surface 2a of the main body, and a gas supply pipe (not shown) can be connected to the nipple 36.

The first valve member 41 is inserted into the insertion hole 9 and is freely angularly displaceable around the axis of the first valve member 41 .

The first valve member 41 includes a cylindrical valve body 42 and a small diameter cylindrical shaft portion 43. The outer diameter of the valve body 42 of the first valve member 41 is selected to be approximately equal to the inner diameter of the insertion hole 9. The valve body 42 of the first valve member 41 is provided with a through hole 44 having an axis perpendicular to the axis of the valve body 42 . The inner diameter of the through hole 44 is selected to be approximately equal to the inner diameter of the insertion hole 3. The through hole 44 is provided at a position communicating with the insertion hole 3. The first valve member 41 is
The holding member 47 prevents its removal. The holding member 47 includes a right cylindrical guide portion 48 and four flange portions, and the flange portion 49 is fixed to the main body 2 by, for example, a set screw 51.

A notch 50 is provided in the guide portion 48 of the holding member 47,
This forms locking surfaces 48a and 48b. A set screw 46, which will be described later, comes into contact with the locking surfaces 48a and 48b. This defines the range in which the first valve member 41 can be angularly displaced. The shaft portion 43 of the first valve member 41 passes through the guide portion 48 of the holding member 47 and projects outward from the main body 2 . At this time, the shaft portion 43 of the first valve member 41 is provided with a set screw 46 made of a so-called slotted set screw or the like.

An operating section 52 is fixed to the tip of the shaft section 43 of the first valve member 41 . The operating section 52 includes an operating section 53 and a connecting section 54 that are formed in a roughly L-shape. T! Sakugunbu 53
A boss 55 is provided at the connection portion with the connecting portion 54 . A through hole 57 is provided near the free end of the connecting portion 54 . The tip of the shaft portion 43 of the first valve member 41 is inserted into the boss 55 and fixed with a set screw 56. In this state, the first valve member 41 can be angularly displaced by operating the operating portion 53 of the operating frame 52.

A second valve member 61 is inserted into the insertion hole 10 and can be freely angularly displaced around the axis of the second valve member 61 .

The second valve member 61 has a similar configuration to the first valve member 41 and includes a cylindrical valve body 62 and a small diameter cylindrical shaft portion 63. The outer diameter of the valve body 62 of the second valve member 61 is selected to be approximately equal to the inner diameter of the insertion hole 10. A through hole 64 having an axis perpendicular to the axis of the valve body 62 is provided in the valve body 62 of the second valve member 61 . The through hole 64 is provided at a position communicating with the insertion hole 4 . The inner diameter of the through hole 64 is selected to be approximately equal to the inner diameter of the insertion hole 4. Valve body 62 of second valve member 61
An annular groove 65 is formed near the upper end, and an O-ring 66 is disposed therein. Thereby, the insertion hole 10 and the valve body 62 of the second valve member 61 are kept airtight. The second valve member 61 is prevented from coming off by the holding member 67. The holding member 67 includes a cylindrical guide portion 68 and a flange portion 6.
9, and the flange portion 69 is, for example, a set screw 7.
0 is fixed to the main body 2. The shaft portion 63 of the second valve member 61 is inserted through the guide portion 68 of the presser member 67 and is inserted into the main body 2.
protrudes outward. A connecting member 71 is fixed to the tip of the shaft portion 63 of the second valve member. The connecting member 71 is formed into a plate shape, and is provided with a boss 72 near one end and a through hole 73 near the other end. Second valve member 61
The tip of the shaft portion 63 is inserted into the boss 72 of the connecting member 71 and fixed with a set screw 74.

The connecting portion 54 of the operation frame 52 and the connecting member 71 are connected to the connecting plate 7.
Connected by 5. Both ends of the connecting plate 75 are pivotally supported by the connecting portion 54 of the operating frame 52 and the connecting member 71 by bolts 76 and nuts 77, respectively. As a result, by operating the operating section 53 of the operating frame 52, the first valve member 41
This enables the angular displacement of the second valve member 61 and the second valve member 61 as one unit.

The valve body 42 of the first valve member 41 is provided with an air hole 45 having an axis perpendicular to the axis of the through hole 44 . Air hole 45
is provided at a position corresponding to the insertion hole 3. This allows a predetermined flow rate of air to pass through the air hole 45 even when the valve body 42 is in the idle state.

The operation of the valve device 1 configured as above will be explained.

For example, air forced by a fan (not shown) or the like flows through the air passage 14 in the valve device 1 from the socket 22 side. Furthermore, this air is supplied to socket 171!11/
\Sent. Further, the combustion gas flows from the nipple 36 through the fuel gas passage 35 provided in the valve device 1, and passes through the gap 16.
sent to. The combustion gas sent to the cavity 16 is
Air flows into the air flow path 14 from the opening side. At this time,
Air and combustion gas are mixed near the end of the air flow path 14 on the socket 17 side, and the mixed gas is sent from the socket 17 side to a combustion section such as a burner.

At this time, the fuel gas is mixed into the air due to the Venturi effect as the air flows through the air flow path 14. Therefore, even if the amount of air flowing through the air flow path changes and increases, the fuel gas is prevented from flowing backward through the fuel gas flow path 35. This prevents incomplete combustion from occurring in the combustion section, such as the burner section. Furthermore, the noise generated when the fuel f'1 gas and air mix is also reduced.

By operating the operation part 53 of the operation frame 52 and angularly displacing the first valve member 41, the amount of opening and closing between the through hole 44 provided in the first valve member 41 and the air flow path 14 is adjusted. The amount of air flowing through the flow path 14 is adjusted. Further, the flow rate of the fuel gas is determined by the through hole 6 provided in the second valve member 61.
4 and the amount of opening/closing of the fuel gas flow path 35.

The through hole 64 provided in the second valve member 61 and the fuel gas flow path 3
5 is determined by the angular displacement of the second valve member 61 integrally with the first valve member 41 by the operation of the operating part 53 of the operating frame 52. Therefore, air flow path 1
As the FXi of the air flowing through the fuel gas passage 35 increases or decreases, the flow rate of the fuel gas flowing through the fuel gas passage 35 also increases or decreases. Therefore, by simply operating the operating portion 53 of the operating frame 52, a mixed gas having a constant mixing ratio of air and fuel gas can be obtained, and the operation is easy.

Furthermore, uniform mixing of air and fuel gas is achieved.

Further, when the first valve member 41 and the second valve member 61 are in the closed state, the air hole 45 is located in the air flow path 14.

Therefore, air passes through the air hole 45, and thereby,
Fuel gas is prevented from remaining in the valve device 1. Therefore, abnormal combustion is prevented from occurring when the burner or the like is re-ignited.

FIG. 5 shows a cross-sectional view of a gas combustion device 81 using the valve device 1 according to an embodiment of the present invention, and FIG.
1 is a plan view of FIG. The gas combustion device 81 is, for example, a gas range. A gas combustion device 83 is housed within a casing 82 of this gas combustion equipment 81 . An annular pedestal 84 is provided on a top plate 82a forming the upper part of the casing 82. Projections 85 are formed on this pedestal 84 at equal intervals in the circumferential direction. This protrusion 85 is formed with an internal thread. An insertion hole 86 is formed in the top plate 82a, and a bottomed cylinder 87 is inserted through the insertion hole 86 and opened upward.

A flange 87a is formed at the upper end of this bottomed cylinder 87, and this flange 87a rides on the protrusion 85, and the screw 88 has an internal thread 85a formed on the protrusion 85.
In this way, the bottomed cylindrical body 87 is attached to the casing 82. A trivet 89 is placed on the flange 87a, and a wok 79, for example, is placed on this trivet 89.

By providing the protrusion 85, a gap is formed between the flange 87a and the top plate 82a.

As air flows through this gap, the top plate 82zt
is prevented from overheating.

A burner 90 is attached to the bottom of the bottomed cylinder 87.

A saucer 91 is provided on the inward side of the bottomed cylindrical body 87 .

This saucer 91 extends along the inner peripheral surface of the bottomed cylinder 87,
The burner 90 is surrounded near the bottom.

Therefore, the bottomed cylinder 87, the saucer 91, and the saucer 9
A space 92 is formed between the burner 90 and the burner 90 . Therefore, this tray 91 serves not only to receive boiled boiled water from the pot 79 but also to form an air flow path for secondary air for combustion as described later.

The combustion chamber 9 of the burner 90 is located between the saucer 91 and the pot 79.
3 is specified. Note that the saucer 91 has a recess 91a formed at its upper end, and the recess 91a engages the engaging protrusion 87b formed on the bottomed cylinder 87. It is attached to the bottom cylinder body 87. Therefore, the saucer 91 can be easily attached to and removed from the bottomed cylindrical body 87, and the saucer 91 can be made relatively large. Even if it is soiled, it can be easily attached and detached and washed with water.

FIG. 7 is a system diagram of the gas combustion equipment 81.

Referring also to FIGS. 5 and 6, the fan 100 is in line! 8 to the processing circuit 113. Switch SW1 is line! 7 to the processing circuit 113. The fan 100 is energized by pressing the switch SW1. The air forced from this fan 100 is
It passes through the air supply line 101 and is sent into the valve device 1 as secondary air for combustion. In the middle of the air supply pipe 101,
One end of the bypass conduit 103 communicates with the bypass conduit 103, and the other end of the bypass conduit 103 communicates with the space 92 from the bottomed cylindrical body 87. Also, the air supply pipe 2! ! 101 , one end of a pilot air supply line 104 communicates between the valve device 1 and a branch point of the bypass line 103 , and the other end of this pilot air supply line 104 communicates with the burner 90 . It's communicating.

For example, fuel gas such as city gas is set to a constant pressure of 1Afl by the governor 105 via the magnetic valve 1, passes through the gas supply pipe 106, and is passed through the fuel gas flow path 35 of the valve device 1.
is supplied to By operating the operating section 53 of the operating section 52 of the valve device 1, the secondary combustion air and fuel gas are premixed, and this mixed gas is supplied to the burner 90 via the pipe 108.

In addition, a part of the fuel gas is transferred to the governor 10 via the solenoid valve ■2.
The pressure is adjusted to a constant pressure at 9, and the pilot gas is supplied to the burner 90 through the pilot gas supply pipe 110.

The burner 90 has a spark plug 111 and a flame rod.

Rad 112 is provided. Spark plug 111 is connected to processing circuit 113 via line 11 .

Moreover, the frame rod 112 is a line! It is connected to the processing circuit 113 via 2. This processing circuit 113 has an earth line J! 3 is connected and the line!
The switch SW2 is connected via the switch SW2. Also, processing time 1
? , 3113 are connected to the solenoid valve V1 via a line 15, and are also connected to the solenoid valve 2 via a line 16. Note that the switches SWl and SW2 are attached to the front control panel of the casing 82 of the gas combustion device 81.

The combustion operation of the gas combustion device 81 having such a configuration will be explained. First, suppress the switch SWI.

This energizes the fan 100, and pilot combustion air is supplied from the pipe 101 to the burner 90 via the pipe 104. Along with this, secondary air for combustion is supplied to the pipe 101.
to the air flow path 14 in the valve device 1 via. Next, the switch SW2 is pressed. As a result, the solenoid valve (2) changes from the closed state to the open state, and the fuel gas is supplied to the solenoid valve (2) as a pilot flame, passes through the governor 109, passes through the conduit 110, and is supplied to the burner 90.

At the same time, the processing circuit 113 outputs the line! 1, a high voltage is applied to one electrode of the spark plug 111. As a result, an ignition operation is performed, and a pilot flame is ignited in the burner 90. At this time, the processing circuit 113 confirms that the fan 100 is set to f, and the ignition operation of the spark plug 111 is performed. When the pilot flame is detected by the Flaynor rod 112 in this state, a detection signal is given to the processing circuit 113, which causes the processing circuit 113 to change the solenoid valve (1) from the closed state to the open state. Therefore, the fuel gas flows through the solenoid valve ■1, the governor 105, and the pipe line 106.
and is supplied to the valve device 1. This allows the valve
! 11, combustion air and fuel gas are premixed by operating the operating section 53 of the operating section 52, and this mixed gas is supplied to the burner 90 from the pipe 108. As a result, the main flame in the burner 90 is ignited. This main flame is located at the burner top 1, as indicated by reference numeral 116 (see Figure 5).
On the other hand, the air supplied from the bypass pipe line 103 into the space 92 as secondary combustion air flows through the secondary combustion air supply port 92.
a (see Figure 5) and is discharged upward. However')
Then, secondary combustion air is supplied to the main flame extending along the burner top 115 from the secondary combustion air supply port 92a,
High-load combustion takes place. In this way, secondary air for combustion is forcibly supplied to perform high-load combustion, so that the combustion effect can be improved. In addition, since a part of the pressurized air from the fan 100 is sent as secondary air for combustion and the remaining air is used as secondary air for combustion, it is possible to reduce the degree of premixing and reduce the flow rate of the mixed gas. can do. Therefore, it is possible to extremely reduce the combustion noise during combustion.

Further, in this gas combustion equipment 81, since the secondary air for combustion can flow up to the upper part of the space 92, the combustion chamber 93
This serves to cool the combustion chamber 93, thereby preventing the combustion chamber 93 from being unnecessarily overheated.

Moreover, the valve device 1 according to the present invention can be suitably implemented not only for city gas but also for gas cookers using LP gas.

Furthermore, in the valve device 1, the first valve member 41 and the second valve member 61 are configured, for example, by a gear train or a pond thereof.
They may be integrally connected to drive angular displacement.

FIG. 8 is a perspective view of a valve device 1a according to another embodiment of the invention. With reference to No. 8I21, the valve arrangement 1a will be described. This embodiment is similar to the previous embodiment and corresponding parts are provided with the same reference numerals.

What is noteworthy about this embodiment is that when the first valve member 41 and the second valve member 61 are angularly displaced in conjunction with each other, the gear 38.
39 was used.

The gear 38 is coaxially fixed to the shaft portion 43 of the first valve member 41, and the gear 39 is also coaxially fixed to the shaft portion 63 of the second valve member 61. These gears 38 and 39 mesh with each other, and the operating portion 52 is integrally formed on the opposite side of the gear 38 from the gear 39.

With such a configuration, even when the operating section 52 is used to drive the first valve member 41 and the second valve member 61 for angular displacement in conjunction with each other, the shape of the teeth of the gears 38 and 39 can be adjusted appropriately. By selecting this, the first valve member 41 and the second valve member 61 can be driven to angularly displace each other without causing operational errors such as rattling. In other words, it becomes possible to more precisely control the flow rates of combustion air and fuel gas.

Effects of the Invention As described above, according to the present invention, the fuel gas flow path is provided in the air flow path provided in the main body of the valve device, with one end thereof opening facing the air flow path. As a result, as the air flows through the air flow path, in other words, due to the Venturi effect, the fuel gas flowing through the fuel gas flow path is mixed with the air flowing through the air flow path, so that the fuel gas Air and fuel gas are mixed uniformly without flowing backward through the fuel gas flow path or pulsating the fuel gas.

Further, the first valve member provided in the air flow path and the second valve member provided in the fuel gas flow path are integrally connected by a connecting means and driven for angular displacement. However, it is possible to set the mixture ratio of fuel gas and air to a predetermined value regardless of the flow rate without separately operating the first valve member and the second valve member, and it is possible to repeatedly I am immersed in creativity.

Furthermore, the air passing through the air hole provided in the first valve member prevents fuel gas from remaining in the valve device even when the first valve member and the second valve member are in a closed state. . Therefore, occurrence of abnormal combustion at the time of re-ignition is prevented.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a valve device 1 according to an embodiment of the present invention, FIG. 2 is a sectional view taken from section line ■-■ in FIG. 1, and FIG.
1 is a cross-sectional view taken from the section line ■-■ in FIG. 1, FIG. 4 is a perspective view of the valve device 1, and FIG. 5 is a valve device 1 according to an embodiment of the present invention.
6111 is a plan view of the gas combustion device 81, FIG. 7 is a system diagram of the gas combustion device 81, and FIG. 8 is a perspective view of another embodiment of the present invention. . 1... Valve device, 2... Main body, 14... Air flow path,
35... Combustion gas flow path, 38.39... Gear, 41
...First valve member, 45...Air hole, 52...(Esaku rod, 53...Operation section, 54...Connection section, 61...
・Second valve member, 71... Connecting member, 75... Connecting plate agent Patent attorney Number of strokes Keiichi Figure 1

Claims (1)

[Scope of Claims] A main body of a valve device, an air passage passing through the main body;
Such a main body is formed with a fuel gas flow path having one end facing the outside of the main body and open and the other end facing the air flow path and opening, and an angularly displaceable fuel gas flow path interposed in the air flow path. 1 valve member, which is formed with an air hole through which air passes when the valve is closed;
Such a first valve member, a second valve member that is interposed in the fuel gas flow path and is angularly displaceable, and a connecting drive means that integrally connects the first and second valve members and drives the angularly displaceable members. A valve device comprising: