Valve device and gas water heater comprising same

Abstract

The application discloses a valve device and a gas water heater comprising the same, and the valve device comprises a valve seat, a driven valve rod, a driving valve rod, a valve pad and a lifting component, the valve seat is provided with a medium outlet, the driven valve rod, the valve pad and the lifting component are all located in the valve seat, the valve pad is sealed against the medium outlet, one end of the lifting component is connected to the driving valve rod, the other end of the lifting component is connected to the edge of the valve pad, the driving valve rod extends into the valve seat, the driving valve rod moves in the valve seat and has a lifting state and an opening state, one end of the driven valve rod is connected to the valve pad, and the other end of the driven valve rod is slidingly connected to the driving valve rod. By moving the driving valve rod on the driven valve rod, the lifting component is driven to act on the edge of the valve pad to form a gap, so that the medium pressure on the upper and lower surfaces of the valve pad is the same, and the problem that the valve is difficult to open due to excessive back pressure is solved.

Description

Technical Field

[0001] This invention relates to a valve device and a gas water heater including the same. Background Technology

[0002] With the rapid development of my country's economy and the continuous improvement of people's living conditions, the water heater market has been growing year by year. In particular, gas water heaters, which heat up quickly, are inexpensive, and easy to install, are widely used, and higher requirements are being placed on their performance.

[0003] Existing gas water heaters suffer from excessive back pressure inside the gas valve, which prevents it from opening smoothly, leading to increased energy consumption and reduced valve lifespan. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of the prior art, such as excessive valve back pressure, which leads to the inability to open the valve smoothly, increased energy consumption, and reduced valve service life, and to provide a valve device and a gas water heater including the same.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] A valve device is characterized in that it includes a valve seat, a driven valve stem, a driving valve stem, a valve gasket, and a tilting component. The valve seat has a medium outlet. The driven valve stem, the valve gasket, and the tilting component are all located inside the valve seat. The valve gasket seals against the medium outlet. One end of the tilting component is connected to the driving valve stem, and the other end of the tilting component is connected to the edge of the valve gasket. The driving valve stem extends into the valve seat and moves within the valve seat, having a tilted state and an open state. One end of the driven valve stem is connected to the valve gasket, and the other end of the driven valve stem is slidably connected to the driving valve stem.

[0007] In the tilted state, the active valve stem moves on the driven valve stem, and the active valve stem drives the tilting component to tilt the edge of the valve pad so as to form a tilted opening between the valve pad and the valve seat;

[0008] In the open state, the movement of the active valve stem causes the driven valve stem and the valve pad to move away from the medium outlet, so that the valve pad separates from the valve seat and opens the medium outlet.

[0009] In this design, the valve seat seals against the medium outlet, and the valve assembly is in a closed state. At this time, the medium pressure inside the valve seat is greater than the medium pressure at the outlet, requiring a larger force to open the valve. The movement of the active valve stem on the driven valve stem causes the lifting component to exert force on the edge of the valve seat, creating a gap. At this point, the medium pressure on the upper and lower surfaces of the valve seat is the same. Continued movement of the active valve stem drives the driven valve stem and the valve seat to move. Because the pressure on the upper and lower surfaces of the valve seat is now the same, the problem of difficulty in opening the valve due to excessive back pressure is solved.

[0010] Preferably, the tilting component includes a tilting rod and a connecting member. The tilting rod includes a hinge portion, a connecting portion, and a tilting portion connected in sequence. The hinge portion is rotatably connected to the valve seat. The connecting portion is connected to one end of the connecting member. The active valve stem applies force to the other end of the connecting member and drives the tilting rod to swing, so that the tilting portion applies force to the edge of the valve pad.

[0011] In this design, when the active valve stem moves on the driven valve stem, it drives the connecting part to move. The hinged part is hinged and fixed inside the valve seat. Utilizing the lever principle, the active valve stem can generate the force required to lift the valve pad with a small force.

[0012] Preferably, the tilting component further includes a fixing rod, and the connecting member includes a first connecting rod and a second connecting rod that are hinged to each other. One end of the fixing rod is fixed inside the valve seat, and the other end of the fixing rod is hinged to the hinge part. The first connecting rod is hinged to the connecting part, and the second connecting rod is hinged to the fixing rod. The fixing rod, the tilting rod, the first connecting rod, and the second connecting rod form a four-bar linkage mechanism. The active valve rod applies force to the second connecting rod and drives the tilting rod to swing.

[0013] In this design, the active valve stem exerts force on the second connecting rod, which is hinged to the first connecting rod. The first connecting rod is hinged to the connecting part, driving the lifting rod to move. The four-bar structure is adopted, which makes the structure more stable and improves the reliability of the valve device.

[0014] Preferably, the active valve stem moves in a direction away from the valve pad to achieve the tilted state and the open state. The valve device further includes an elastic element, the two ends of which apply forces to the valve seat and the active valve stem respectively to apply a force to the active valve stem in a direction close to the valve pad.

[0015] In this design, by incorporating an elastic element, the active valve stem can drive the driven valve stem and valve pad to move towards the valve pad, ultimately sealing the valve pad against the medium outlet.

[0016] Preferably, the elastic element is a spring, and the spring is sleeved on the active valve stem.

[0017] In this design, the spring is sleeved on the active valve stem. Using a spring as the spring component has the advantages of simple and stable structure and low price.

[0018] Preferably, the outer circumferential surface of the active valve stem has an outwardly protruding frustum portion, the frustum portion abutting against the raised member, and the elastic member is pressed between the frustum portion and the valve seat.

[0019] In this design, a truncated cone portion protruding outward is provided on the outer circumferential surface of the active valve stem. By contacting the lifting component, the force generated by the movement of the active valve stem is applied to the lifting component, causing it to move and thus lifting the valve pad. The truncated cone portion contacts the elastic element, applying a compressive force to the elastic element and receiving the force generated by the elastic element's restoring deformation. When the active valve stem moves towards the valve pad, the truncated cone portion applies a force towards the valve pad to the driven valve stem and / or valve pad, causing the driven valve stem and valve pad to move closer to the medium outlet, ultimately sealing against the medium outlet.

[0020] Preferably, the end of the active valve stem has a groove, the driven valve stem extends into the groove and moves within the groove, and the groove opening has an inwardly extending limiting portion that abuts against the driven valve stem to prevent the driven valve stem from disengaging from the groove.

[0021] In this design, the active valve stem and the driven valve stem are connected by a sliding groove. An inwardly extending limiting part is provided at the groove opening. From the closed state to the tilted state, the active valve stem moves along the driven valve stem in a direction away from the valve seat. At this time, due to back pressure, the driven valve stem and valve seat do not move and remain against the medium outlet. The active valve stem drives the tilting component to tilt the valve seat, making the pressure on the upper and lower surfaces of the valve seat equal. At this time, the limiting part at the groove opening abuts against the driven valve stem, restricting the relative movement between the driven and active valve stems. The active valve stem continues to move away from the valve seat, and the limiting part applies a force to the driven valve stem in a direction away from the valve seat, causing the driven valve stem to move with the active valve stem. Because the driven valve stem is connected to the valve seat, the valve seat also moves away from the medium outlet.

[0022] When the valve moves from the open state to the closed state, the active valve stem moves towards the valve pad. At this time, the bottom of the sluice applies a force to the driven valve stem towards the valve pad, so as to drive the driven valve stem and the valve pad to move towards the medium outlet, and finally make the valve pad seal against the medium outlet.

[0023] Preferably, the inner wall of the valve seat has an inwardly recessed relief groove, the edge of the valve pad extends into the opening of the relief groove, and the raised component extends into the relief groove.

[0024] In this solution, by setting an inwardly recessed relief groove on the inner wall of the valve seat, the raised part contacts the edge of the valve gasket in the relief groove, making the seal between the valve gasket and the medium outlet more tight and improving the safety of the entire valve device.

[0025] Preferably, the raised component is a flexible connector, one end of which is connected to the active valve stem, and the other end of which is connected to the edge of the valve pad.

[0026] In this solution, a flexible connector is selected as the lifting component, which is inexpensive and has a simple structure.

[0027] A gas water heater, characterized in that the gas water heater includes the valve device described above.

[0028] In this solution, applying the aforementioned valve device to a gas water heater can improve its energy efficiency and reduce the probability of needing to replace or repair the valve.

[0029] The positive and progressive effects of the present invention are as follows: the valve device of the present invention and the gas water heater containing it, by setting up a tilting component, make the opening of the valve device go through a tilted state and an open state in sequence. When it is in the tilted state, the medium pressure on the upper and lower surfaces of the valve seat is the same, thereby solving the problem that the valve cannot be opened due to excessive back pressure, resulting in increased energy consumption and reduced valve service life. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the internal structure of a valve device according to an embodiment of the present invention.

[0031] Figure 2 This is a schematic diagram of the structure of a lifting component according to an embodiment of the present invention.

[0032] Explanation of reference numerals in the attached figures:

[0033] Valve seat 1

[0034] Medium outlet 11

[0035] 12 clearance slots

[0036] Medium inlet 13

[0037] Valve gasket 2

[0038] Driven valve stem 3

[0039] 31 round truncated cones

[0040] Active valve stem 4

[0041] Frustum 41

[0042] Slide 42

[0043] Restriction Section 43

[0044] Elastic component 5

[0045] 6 raised parts

[0046] Fixed rod 61

[0047] Lift lever 62

[0048] Hinged part 621

[0049] Connecting part 622

[0050] Upturned part 623

[0051] First link 63

[0052] Second link 64

[0053] Valve body 7 Detailed Implementation

[0054] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments.

[0055] like Figure 1 As shown in the figure, an embodiment of the present invention discloses a valve device, including a valve seat 1, a driven valve stem 3, a driven valve stem 4, a valve pad 2, and a tilting component 6. The valve seat 1 is provided with a medium outlet 11. The driven valve stem 3, the valve pad 2, and the tilting component 6 are all located inside the valve seat 1. The valve pad 2 seals against the medium outlet 11. One end of the tilting component 6 is connected to the driven valve stem 4, and the other end of the tilting component 6 is connected to the edge of the valve pad 2. The driven valve stem 4 extends into the valve seat 1 and moves within the valve seat 1, having a tilted state and an open state. One end of the driven valve stem 3 is connected to the valve pad 2, and the other end of the driven valve stem 3 is connected to the driven valve stem 4.

[0056] In use, the valve device of this embodiment allows the medium to enter the valve seat 1 through the medium inlet 13 and exit through the medium outlet 11. When in the closed state, the valve gasket 2 seals against the medium outlet 11, preventing the medium entering the valve seat 1 through the medium inlet 13 from being discharged through the medium outlet 11. The medium pressure inside the valve seat 1 is greater than the pressure at the medium outlet 11, causing the valve gasket 2 to be subjected to a force pointing towards the medium outlet 11. Therefore, opening the valve device requires a large force.

[0057] In the tilted state, the active valve stem 4 moves on the driven valve stem 3, and the active valve stem 4 drives the tilting component 6 to tilt the edge of the valve pad 2, thereby forming a tilted opening between the valve pad 2 and the valve seat 1. Before the tilted opening is formed, the pressure inside the valve seat 1 is greater than the pressure at the medium outlet 11. After the tilted opening is formed, the medium entering the valve seat 1 through the medium inlet 13 flows out through the opening formed between the valve pad 2 and the valve seat 1 under pressure. The pressure on the upper and lower surfaces of the valve pad 2 gradually balances, and at this time, only a small force is needed to open the valve device.

[0058] When in the open state, the active valve stem 4 continues to move away from the medium outlet 11, and drives the driven valve stem 3 and valve pad 2 away from the medium outlet 11, so that the valve pad 2 separates from the valve seat 1 and opens the medium outlet 11. At this time, the medium that enters the valve seat 1 through the medium inlet 13 can quickly pass through the medium outlet 11.

[0059] The above structure solves the problem of valve devices being difficult to open due to excessive back pressure.

[0060] In this embodiment, the inner wall of the valve seat 1 has an inwardly recessed relief groove 12. The edge of the valve pad 2 extends into the groove opening of the relief groove 12, and the lifting member 6 extends into the relief groove 12. As the active valve stem 4 moves, the lifting member 6 applies a force to the edge of the valve pad 2 in the relief groove 12 in a direction away from the medium outlet 11, so that a gap is generated between the valve pad 2 and the medium outlet 11, thereby balancing the pressure on the upper and lower surfaces of the valve pad 2.

[0061] In this embodiment, the lifting component 6 adopts a linkage structure, including a lifting rod 62 and a connecting member. The lifting rod 62 includes a hinge portion 621, a connecting portion 622, and a lifting portion 623 connected in sequence. The hinge portion 621 is rotatably connected to the valve seat 1, and the connecting portion 622 is connected to one end of the connecting member. The active valve rod 4 applies force to the other end of the connecting member and drives the lifting rod 62 to swing, so that the lifting portion 623 applies force to the edge of the valve pad 2. When the active valve rod 4 moves on the driven valve rod 3, it drives the connecting portion 622 to move. The hinge portion 621 is hinged and fixed in the valve seat 1. Utilizing the lever principle, the active valve rod 4 can generate the force required to lift the valve pad 2 with a relatively small force.

[0062] like Figure 2As shown, the tilting component 6 also includes a fixed rod 61. The connecting component includes a first connecting rod 63 and a second connecting rod 64 that are hinged to each other. One end of the fixed rod 61 is fixed inside the valve seat 1, and the other end of the fixed rod 61 is hinged to the hinge part 621. The first connecting rod 63 is hinged to the connecting part 622, and the second connecting rod 64 is hinged to the fixed rod 61. The fixed rod 61, the tilting rod 62, the first connecting rod 63, and the second connecting rod 64 form a four-bar linkage. The active valve rod 4 applies force to the second connecting rod 64 and drives the tilting rod 62 to swing. In this embodiment, the first connecting rod 63 is parallel to the fixed rod 61, and the second connecting rod 64 is parallel to the tilting rod 62. The active valve rod 4 applies force to the second connecting rod 64, and the second connecting rod 64 is hinged to the first connecting rod 63. The first connecting rod 63 is hinged to the connecting part 622 and drives the tilting rod 62 to move. The four-bar linkage structure makes the structure more stable and improves the reliability of the valve device.

[0063] The active valve stem 4 moves away from the valve pad 2 to achieve the tilted state and the open state. The valve device also includes an elastic element 5, the two ends of which exert forces on the valve seat 1 and the active valve stem 4 respectively, so as to apply a force to the valve stem in the direction close to the valve pad 2.

[0064] like Figure 1 As shown, an elastic element 5 is provided between the valve seat 1 and the driving valve stem 4. The elastic element 5 exerts a force on the driving valve stem 4, causing it to move towards the valve pad 2. This, in turn, causes the driven valve stem 3 and the valve pad 2 to move, ultimately sealing the valve pad 2 against the medium outlet 11, thus putting the valve device in a sealed state. By providing the elastic element 5, the driving valve stem 4 can help drive the driven valve stem 3 and the valve pad 2 towards the valve pad 2.

[0065] In this embodiment, the elastic element 5 is a spring, which is sleeved on the active valve stem 4. When the active valve stem 4 moves away from the valve pad 2, the spring is compressed. After the active valve stem 4 is no longer subjected to the force away from the valve pad 2, the active valve stem 4, under the action of the force applied by the spring towards the valve pad 2, drives the driven valve stem 3 and the valve pad 2 to approach the medium outlet 11. Finally, the valve pad 2 seals against the medium outlet 11. Using a spring as the spring element has the advantages of simple and stable structure and low price.

[0066] In this embodiment, the outer peripheral surface of the active valve stem 4 has an outwardly protruding frustum 41. The frustum 41 abuts against the lifting member 6, and the elastic member 5 is pressed between the frustum 41 and the valve seat 1. Through the contact between the frustum 41 and the lifting member 6, the force generated by the movement of the active valve stem 4 is applied to the lifting member 6, causing the lifting member 6 to move to achieve the purpose of lifting the valve pad 2. Through the contact between the frustum 41 and the elastic member 5, a compressive force is applied to the elastic member 5 and the force generated by the recovery deformation of the elastic member 5 is applied. When the active valve stem 4 moves towards the valve pad 2, the frustum 41 applies a force towards the valve pad 2 to the driven valve stem 3 and the valve pad 2, causing the driven valve stem 3 and the valve pad 2 to move closer to the medium outlet 11, and finally causing the valve pad 2 to seal against the medium outlet 11.

[0067] The active valve stem 4 and the driven valve stem 3 are slidably connected. In this embodiment, the end of the active valve stem 4 has a groove 42. One end of the driven valve stem 3 is connected to the valve pad 2, and the other end extends into the groove 42 and moves within the groove 42. The end of the driven valve stem 3 that extends into the groove 42 has a frustum 31. The diameter of the frustum 31 is larger than the cross-sectional diameter of the driven valve stem 3. The groove opening of the groove 42 has an inwardly extending limiting part 43. The limiting part 43 abuts against the frustum 31 on the driven valve stem 3 to prevent the driven valve stem 3 from disengaging from the groove 42. When moving from the closed state to the raised state, the active valve stem 4 moves along the driven valve stem 3 in a direction away from the valve pad 2. At this time, due to back pressure, the driven valve stem 3 and the valve pad 2 do not move and remain against the medium outlet 11. The active valve stem 4 drives the connecting piece to move, and the connecting piece drives the raising rod 62 to exert force on the edge of the valve pad 2. The edge of the valve pad 2 is subjected to force and a gap is created between it and the valve seat 1 at the medium outlet 11. The medium that enters the valve seat 1 through the medium inlet 13 flows out through this gap, and the pressure on the upper and lower surfaces of the valve pad 2 gradually becomes the same.

[0068] When the valve stem 4 moves from the tilted-up position to the open position, the active valve stem 4 continues to move away from the valve seat 2. The limiting part 43 of the groove abuts against the frustum 31 of the driven valve stem 3, limiting the relative movement between the driven valve stem 3 and the active valve stem 4. The active valve stem 4 continues to move away from the valve seat 2, and the limiting part 43 applies a force to the frustum 31 of the driven valve stem 3 in a direction away from the valve seat 2, so that the driven valve stem 3 moves with the active valve stem 4. Since the driven valve stem 3 is connected to the valve seat 2, the valve seat 2 also moves away from the medium outlet 11. At this time, the medium that enters the valve seat 1 through the medium inlet 13 leaves the valve device through the medium outlet 11.

[0069] When transitioning from the open to the closed state, in this embodiment, the spring sleeved on the outside of the active valve stem 4 restores its deformation and applies a force toward the valve pad 2 to the frustum 41 of the active valve stem 4. The active valve stem 4 moves toward the valve pad 2. At this time, the bottom of the slide groove 42 applies a force toward the valve pad 2 to the frustum 31 of the driven valve stem 3, thereby driving the driven valve stem 3 and the valve pad 2 toward the medium outlet 11, ultimately causing the valve pad 2 to seal against the medium outlet 11. At this time, the medium entering the valve seat 1 through the medium inlet 13 cannot be discharged through the medium outlet 11 and accumulates inside the valve seat 1, generating a large pressure that acts on the lower surface of the valve pad 2, resulting in a better sealing effect between the valve pad 2 and the medium outlet 11.

[0070] In this embodiment, the valve device is a solenoid valve. When the solenoid valve is energized, it attracts the active valve stem 4 to move away from the valve pad 2. The active valve stem 4 drives the lifting component 6 to lift the edge of the valve pad 2. At this time, the pressure on the upper and lower surfaces of the valve pad 2 is the same. The active valve stem 4 continues to move away from the valve pad 2, driving the driven valve stem 3 and the valve pad 2 away from the medium outlet 11, and the entire valve device is in the open state. When the solenoid valve is de-energized, the active valve stem 4 is no longer subjected to magnetic force. At this time, under the action of the elastic element 5, the active valve stem 4 drives the driven valve stem 3 and the valve pad 2 to move towards the medium outlet 11, finally causing the valve pad 2 to seal against the medium outlet 11, and the entire solenoid valve is in the closed state. In other embodiments, as long as the reciprocating motion of the active valve stem 4 can be controlled, the type of valve device is not limited. In this embodiment, the valve seat 1 includes an upper valve seat and a valve body 7. The upper valve seat and the valve body 7 are detachably connected, which facilitates later maintenance and replacement and reduces the cost of use.

[0071] In other embodiments, the valve device can also be a manually adjustable valve, in which the threaded rod is manually rotated to drive the reciprocating motion of the active valve rod 4, and the reciprocating motion of the active valve rod 4 drives the movement of the driven valve rod 3, the valve pad 2 and the lifting component 6, so as to control the closed state, the lifting state and the open state of the valve device.

[0072] In another embodiment, the lifting component 6 can be a flexible connector. One end of the flexible connector is connected to the active valve stem 4, and the other end is connected to the edge of the valve pad 2. When the active valve stem 4 moves away from the valve pad 2 on the driven valve stem 3, the flexible connector tightens, causing a gap to form in the valve pad 2. Then, the active valve stem 4 drives the driven valve stem 3 and the valve pad 2 to move away from the medium outlet 11. When the active valve stem 4 moves towards the valve pad 2, it drives the driven valve stem 3 and the valve pad 2 to move, at which point the flexible connector is in a relaxed state.

[0073] This embodiment also discloses a gas water heater, which includes the valve device described above. By using the lifting component 6 provided in the valve device, a gap is created between the valve pad 2 and the medium outlet 11 with a small force, thereby balancing the pressure difference between the upper and lower surfaces of the valve pad 2 and solving the problem of the valve being unable to open due to excessive back pressure inside the valve.

[0074] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A valve device, characterized in that, It includes a valve seat, a driven valve stem, a driving valve stem, a valve gasket, and a tilting component. The valve seat has a medium outlet. The driven valve stem, the valve gasket, and the tilting component are all located inside the valve seat. The valve gasket seals against the medium outlet. One end of the tilting component is connected to the driving valve stem, and the other end of the tilting component is connected to the edge of the valve gasket. The driving valve stem extends into the valve seat and moves within the valve seat, having a tilted state and an open state. One end of the driven valve stem is connected to the valve gasket, and the other end of the driven valve stem is slidably connected to the driving valve stem. In the tilted state, the active valve stem moves on the driven valve stem, and the active valve stem drives the tilting component to tilt the edge of the valve pad so as to form a tilted opening between the valve pad and the valve seat; In the open state, the movement of the active valve stem causes the driven valve stem and the valve pad to move away from the medium outlet, so that the valve pad separates from the valve seat and opens the medium outlet.

2. The valve device as described in claim 1, characterized in that, The tilting component includes a tilting rod and a connector. The tilting rod includes a hinge, a connecting part, and a tilting part connected in sequence. The hinge is rotatably connected to the valve seat. The connecting part is connected to one end of the connector. The active valve stem applies force to the other end of the connector and drives the tilting rod to swing, so that the tilting part applies force to the edge of the valve pad.

3. The valve device as described in claim 2, characterized in that, The tilting component further includes a fixing rod, and the connecting member includes a first connecting rod and a second connecting rod that are hinged to each other. One end of the fixing rod is fixed inside the valve seat, and the other end of the fixing rod is hinged to the hinge part. The first connecting rod is hinged to the connecting part, and the second connecting rod is hinged to the fixing rod. The fixing rod, the tilting rod, the first connecting rod, and the second connecting rod form a four-bar linkage mechanism. The active valve rod applies force to the second connecting rod and drives the tilting rod to swing.

4. The valve device as claimed in claim 1, characterized in that, The active valve stem moves in a direction away from the valve pad to achieve the tilted state and the open state. The valve device also includes an elastic element, the two ends of which apply forces to the valve seat and the active valve stem respectively to apply a force to the active valve stem in a direction close to the valve pad.

5. The valve device as described in claim 4, characterized in that, The elastic element is a spring, and the spring is sleeved on the active valve stem.

6. The valve device as claimed in claim 4, characterized in that, The outer circumferential surface of the active valve stem has an outwardly protruding frustum portion, which abuts against the raised component, and the elastic element is pressed between the frustum portion and the valve seat.

7. The valve device as claimed in claim 1, characterized in that, The end of the active valve stem has a groove, the driven valve stem extends into the groove and moves within the groove, the groove opening has an inwardly extending limiting part, the limiting part abuts against the driven valve stem to prevent the driven valve stem from disengaging from the groove.

8. The valve device as claimed in claim 1, characterized in that, The inner wall of the valve seat has an inwardly recessed relief groove, the edge of the valve pad extends into the opening of the relief groove, and the raised component extends into the relief groove.

9. The valve device as claimed in claim 1, characterized in that, The raised component is a flexible connector, one end of which is connected to the active valve stem, and the other end of which is connected to the edge of the valve pad.

10. A gas-fired water heater, characterized in that, It includes the valve device as described in any one of claims 1-9.

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