Valve assembly and water heater

Abstract

The application provides a valve assembly and a water heater. The valve assembly comprises a shell, a fluid inlet and a fluid outlet arranged at two ends of the shell respectively, a first valve core and a second valve core arranged in the shell, and the second valve core is limited at a specified position by a limiting part. When the pressure of the valve assembly reaches a predetermined pressure, the first valve core pushes the limiting part to separate from the second valve core, so that the second valve core closes the fluid outlet. Thus, the part cracking is prevented and the water supply can be interrupted in time after the part cracking at the water outlet end.

Description

Technical Field

[0001] This invention relates to the field of valves, and in particular to a valve assembly and a water heater. Background Technology

[0002] Household water heaters commonly suffer from unstable water flow in the pipes. This fluctuation in flow or pressure can range from minor issues like inconsistent water temperature to more serious problems like parts bursting due to excessive pressure. Besides the risk of bursting parts, the outlet components can also freeze and crack due to low ambient temperatures. Current water heater technology ignores the risk of leakage after these bursts, continuing to supply water as instructed by the user, lacking a mechanism to promptly shut off the water supply in such situations. Therefore, there is a market demand for a protective mechanism that can prevent component bursting and promptly shut off the water supply should the outlet components freeze. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to prevent the parts from cracking and to interrupt the water supply in time after the parts at the water outlet freeze and crack, thereby providing a valve assembly and a water heater.

[0004] The present invention solves the above-mentioned technical problems through the following technical solution:

[0005] A valve assembly, comprising:

[0006] The casing has a fluid inlet and a fluid outlet at each end.

[0007] The first valve core and the second valve core are disposed inside the housing. The second valve core is limited to a designated position by a limiting part. When the pressure on the valve assembly reaches a predetermined pressure, the first valve core pushes the limiting part to disengage from the second valve core, thereby closing the fluid outlet.

[0008] In this design, the fluid inlet of the housing is the initial inlet for fluid to enter the valve assembly, and the fluid outlet of the housing is the final outlet for fluid to exit the valve assembly. When fluid enters the valve assembly through the fluid inlet, the fluid pressure acts on the end face of the first valve core near the fluid inlet, thus pushing the first valve core towards the fluid outlet. When the pressure reaches a predetermined pressure, i.e., the maximum value that the water supply system can withstand, the first valve core moves further towards the fluid outlet and pushes the limiting part to release the second valve core from the limiting part's constraint. Subsequently, the end face of the second valve core near the fluid inlet is also subjected to fluid pressure, causing the second valve core to move towards the fluid outlet. The second valve core ultimately closes the fluid outlet, interrupting the water supply to the valve assembly. In this manner, when the water flow rate or water pressure entering the valve assembly experiences an abnormally sudden increase, the valve assembly releases the second valve core by pushing the limiting part with the first valve core, using the second valve core to close the fluid outlet and interrupt the water supply, thereby preventing component cracking due to excessive water pressure. Similarly, when the parts at the water outlet freeze and crack due to low ambient temperature, the water pressure at the water outlet drops sharply. As a result, the water pressure entering the valve assembly will be much greater than the water pressure at the water outlet. This pressure difference will also cause the first valve core to push the limiting part to release the second valve core, thereby using the second valve core to close the fluid outlet and interrupt the water supply.

[0009] Preferably, the second valve core is disposed around the outside of the first valve core. When the second valve core is in a designated position, the limiting part passes through the outer wall of the housing to the inner wall of the second valve core and protrudes from the inner wall of the second valve core.

[0010] In this design, the limiting part extends from the outer wall of the housing to the inner wall of the second valve core and protrudes from the inner wall of the second valve core. This limiting part, located outside the housing, limits the movement of the second valve core inside the housing, achieving an outside-to-inside limiting method. In this configuration, the operator can directly manipulate and adjust the limiting relationship between the limiting part and the second valve core from the outside of the valve assembly, eliminating the need to disassemble the valve assembly for operation and adjustment.

[0011] Preferably, the end of the first valve core facing the fluid inlet is attached to the inner wall of the second valve core, so that the end of the first valve core facing the fluid inlet moves along the inner wall of the second valve core to push the limiting part away from the second valve core.

[0012] In this solution, by attaching the end of the first valve core facing the fluid inlet to the inner wall of the second valve core, the aforementioned end is used to push the limiting part protruding from the inner wall of the second valve core. The cooperation between the two is simple and convenient, and it is easy to realize the release of the second valve core by using the first valve core to push the limiting part.

[0013] Preferably, the second valve core has a baffle at one end facing the fluid outlet, the baffle extending between the inner wall of the housing and the outer wall of the first valve core, the second valve core sealing the fluid outlet by means of the baffle.

[0014] In this design, the baffle extends between the inner wall of the housing and the outer wall of the first valve core, so that when the fluid outlet is closed by the second valve core, the baffle can fully and completely seal the entire fluid outlet, thus improving the sealing effect.

[0015] Preferably, an elastic element receiving cavity is formed between the end of the first valve core facing the fluid inlet and the baffle along the central axis of the housing. A first elastic element is disposed in the elastic element receiving cavity, and the first elastic element provides a force that moves the second valve core toward the fluid outlet.

[0016] In this design, a first elastic element is provided in the elastic element receiving cavity. Therefore, in the first aspect, before the water pressure reaches the maximum value that the water supply system can withstand, water flows normally through the valve assembly, and the second valve core is confined to a designated position. The elastic force provided by the first elastic element allows the first valve core to be actively offset away from the limiting part, preventing the first valve core from accidentally contacting the limiting part and causing the second valve core to be released. When the water pressure exceeds this maximum value, the first valve core overcomes the elastic force of the first elastic element and pushes the limiting part to release the second valve core. The second valve core is then quickly pushed towards the fluid outlet using the elastic force of the first elastic element, promptly interrupting the water supply. After the water pressure exceeds this maximum value and returns to normal, the operator can use a tool to push the second valve core away from the closed fluid outlet position. At this time, the elastic force of the first elastic element allows the second valve core to drive the first valve core back to its initial position, saving the resetting operation steps.

[0017] Preferably, a hook is provided at one end of the limiting part that protrudes from the inner wall of the second valve core, and the second valve core is hooked at a designated position by the hook;

[0018] And / or, a limiting cavity is provided on the outer wall of the housing at the position through which the limiting part passes, and a second elastic member is provided in the limiting cavity. The second elastic member provides a force to deflect the limiting part away from the second valve core.

[0019] In this design, the second valve core is hooked into a designated position via a latch, making the engagement between the hook and the second valve core simple, convenient, and easy to implement. The hook also ensures stable and reliable positioning between the limiting part and the second valve core, preventing accidental release of the limiting part from the second valve core. In this design, the second elastic element provides a force that displaces the limiting part away from the second valve core, allowing for rapid removal of the limiting part from the second valve core when the first valve core pushes the limiting part to release it, resulting in a faster release speed. By providing a cavity for the elastic element, unnecessary movement or wobbling of the limiting part and the second elastic element on the valve assembly is prevented, allowing the second elastic element to more effectively provide the force to displace the limiting part away from the second valve core.

[0020] Preferably, the valve assembly further includes a throttling section located at the fluid outlet and extending toward the interior of the housing along the central axis of the housing.

[0021] In this solution, the valve assembly changes the size of the flow space formed by the first valve core and the surface of the throttling part by changing the position of the first valve core, thereby adjusting the flow velocity of the fluid when it passes through the valve assembly, so that the total flow rate remains unchanged and the effect of stabilizing the flow is achieved.

[0022] Preferably, when the second valve core closes the fluid outlet, the first valve core abuts against the outer edge of the base of the throttling section.

[0023] In this solution, the inner wall of the first valve core abuts against the base of the throttling section, thereby forming a secondary seal between the inner wall of the first valve core and the base of the throttling section while the second valve core seals the fluid outlet, thus achieving a better sealing effect for the fluid.

[0024] Preferably, a first stop extending toward the interior of the housing is provided at the fluid inlet;

[0025] And / or, a second stop extending toward the interior of the housing is provided at the fluid outlet.

[0026] In this design, the first stop and the second stop prevent the first valve core and the second valve core inside the housing from detaching, thereby avoiding accidental disintegration of the valve assembly during use.

[0027] A water heater comprising the valve assembly of any of the above.

[0028] In this solution, the water heater is equipped with the aforementioned valve assembly, which can prevent parts from cracking and can promptly interrupt the water supply if the parts at the water outlet freeze and crack.

[0029] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of the present invention.

[0030] The positive and progressive effects of this invention are as follows: the valve assembly and water heater of this invention can prevent parts from cracking and can promptly interrupt the water supply after the parts at the water outlet freeze and crack, which is a significant improvement. Attached Figure Description

[0031] Figure 1 This is a three-dimensional structural diagram of the valve assembly according to an embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram (a) of the working state of the valve assembly according to an embodiment of the present invention;

[0033] Figure 3 This is a schematic diagram (II) of the working state of the valve assembly according to an embodiment of the present invention;

[0034] Figure 4 This is a schematic diagram (III) of the working state of the valve assembly according to an embodiment of the present invention;

[0035] Figure 5 This is a three-dimensional structural schematic diagram of the first valve core of the valve assembly according to an embodiment of the present invention;

[0036] Figure 6 This is a three-dimensional structural diagram of the second valve core of the valve assembly according to an embodiment of the present invention.

[0037] Explanation of reference numerals in the attached figures:

[0038] Valve assembly 1000

[0039] Casing 10

[0040] Fluid inlet 11

[0041] Fluid outlet 12

[0042] Throttling section 13

[0043] First valve core 21

[0044] Second valve core 22

[0045] baffle 30

[0046] Limiting part 40

[0047] Hook 41

[0048] Elastic element receiving cavity 50

[0049] First elastic element 51

[0050] Limiting cavity 60

[0051] Second elastic element 61

[0052] First stop section 71

[0053] Second stop section 72 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 1-4 As shown, a valve assembly 1000 includes:

[0056] The housing 10 has a fluid inlet 11 and a fluid outlet 12 at its two ends, respectively.

[0057] The first valve core 21 and the second valve core 22 are disposed inside the housing 10. The second valve core 22 is limited to a designated position by the limiting part 40. When the pressure on the valve assembly 1000 reaches the predetermined pressure, the first valve core 21 pushes the limiting part 40 to disengage from the second valve core 22, thereby the second valve core 22 closes the fluid outlet 12.

[0058] In specific implementation, the fluid inlet 11 of the housing 10 is the initial inlet for fluid to enter the valve assembly 1000, and the fluid outlet 12 of the housing 10 is the final outlet for fluid to exit the valve assembly 1000. When fluid enters the valve assembly 1000 from the fluid inlet 11, the pressure of the fluid acts on the end face of the first valve core 21 near the fluid inlet 11, thereby pushing the first valve core 21 to move toward the fluid outlet 12. When the pressure reaches a predetermined pressure, that is, when the maximum value that the water supply system can withstand is reached, the first valve core 21 moves further toward the fluid outlet 12 and pushes the limiting part 40 to release the second valve core 22 from the limitation of the limiting part 40. Subsequently, the end face of the second valve core 22 near the fluid inlet 11 is also subjected to the pressure of the fluid, causing the second valve core 22 to move toward the fluid outlet 12. The second valve core 22 finally closes the fluid outlet 12, thereby interrupting the water supply to the valve assembly 1000. In this manner, when the water flow rate or water pressure entering the valve assembly 1000 suddenly increases abnormally, the valve assembly 1000 releases the second valve core 22 by pushing the limiting part 40 through the first valve core 21. The second valve core 22 then closes the fluid outlet 12 and interrupts the water supply, thereby preventing the parts from cracking due to excessive water pressure. Similarly, when the parts at the water outlet freeze and crack due to low ambient temperature, the water pressure at the water outlet drops sharply. As a result, the water pressure entering the valve assembly 1000 will be much greater than the water pressure at the water outlet. This pressure difference will also cause the first valve core 21 to push the limiting part 40 to release the second valve core 22, thereby closing the fluid outlet 12 and interrupting the water supply. In this embodiment, the valve assembly 1000 is a unit based on a housing 10, a first valve core 21, and a second valve core 22. In practice, those skilled in the art can use multiple valve assembly units as needed to meet the requirements of multi-pipe applications or large-area installations. This embodiment does not limit this. In this embodiment, the housing 10, the first valve core 21, and the second valve core 22 are all cylindrical. As an alternative implementation, all three can have a certain degree of curvature, presenting a shape similar to a "C". Without affecting the normal operation of the valve assembly 1000, those skilled in the art can choose whether to set the curvature and the specific size of the curvature according to actual needs. This embodiment does not limit this. On the other hand, in this embodiment, the outermost edge of the wall of the second valve core 22 is attached to the inner wall of the housing 10, thereby achieving a good sealing effect between the housing 10 and the second valve core 22, so that the water pressure of the fluid can exert a more sufficient and effective driving effect when it acts on the end face of the second valve core 22 near the fluid inlet 11.As an alternative implementation, the outermost edge of the second valve core 22 can also have a gap with the inner wall of the housing 10. This allows the water pressure of the fluid to push the second valve core 22 towards the fluid outlet 12 near the fluid inlet 11. Those skilled in the art can also use commonly used coatings or films for sealing and lubrication, such as graphite or petroleum jelly, in the gap. This embodiment does not limit this. Furthermore, in this embodiment, the fluid channel in the valve assembly 1000 has a smooth surface. However, those skilled in the art can also use commonly used flow-stabilizing structures in the fluid channel, such as protrusions to prevent turbulence or guide plates to guide the fluid, according to actual needs. This embodiment does not limit this.

[0059] like Figure 2-4 and Figure 6 As shown, the second valve core 22 is disposed around the outside of the first valve core 21. When the second valve core 22 is in a designated position, the limiting part 40 passes through the outer wall of the housing 10 to the inner wall of the second valve core 22 and protrudes from the inner wall of the second valve core 22.

[0060] In practical implementation, the limiting part 40 extends from the outer wall of the housing 10 to the inner wall of the second valve core 22 and protrudes from the inner wall of the second valve core 22. Thus, the limiting part 40, located outside the housing 10, limits the second valve core 22 inside the housing 10, achieving a limiting method from the outside in. In this method, the operator can directly operate and adjust the limiting relationship between the limiting part 40 and the second valve core 22 from the outside of the valve assembly 1000, saving the need to disassemble the valve assembly 1000 for operation and adjustment.

[0061] like Figure 2-4 and Figure 5 As shown, the end of the first valve core 21 facing the fluid inlet 11 is attached to the inner wall of the second valve core 22, so that the end of the first valve core 21 facing the fluid inlet 11 moves along the inner wall of the second valve core 22 to push the limiting part 40 away from the second valve core 22.

[0062] In practical implementation, by attaching the end of the first valve core 21 facing the fluid inlet 11 to the inner wall of the second valve core 22, the aforementioned end is used to push the limiting part 40 protruding from the inner wall of the second valve core 22. The cooperation between the two is simple and convenient, and it is easy to realize the release of the second valve core 22 by using the first valve core 21 to push the limiting part 40. As an alternative implementation, there may also be a gap between the end of the first valve core 21 facing the fluid inlet 11 and the inner wall of the second valve core 22. Without hindering the first valve core 21 from pushing the limiting part 40, those skilled in the art can also use coatings or films commonly used in the prior art that can play a sealing and lubricating role in the aforementioned gap, such as graphite or petroleum jelly. This embodiment does not limit this.

[0063] like Figure 2-4 As shown, the second valve core 22 has a baffle 30 at one end facing the fluid outlet 12. The baffle 30 extends between the inner wall of the housing 10 and the outer wall of the first valve core 21. The second valve core 22 closes the fluid outlet 12 through the baffle 30.

[0064] In specific implementation, the baffle 30 extends between the inner wall of the housing 10 and the outer wall of the first valve core 21, so that when the fluid outlet 12 is closed by the second valve core 22, the baffle 30 can fully and completely seal the entire fluid outlet 12, further improving the sealing effect. In this embodiment, the baffle 30 is configured to fit flatly and completely against the entire end face of the housing 10 where the fluid outlet 12 is provided, thereby ensuring the reliability of the closure. As an alternative implementation, the specific shape of the baffle 30 can also be configured to match only the shape of the fluid outlet 12, or it can be provided with a connecting protrusion that can protrude from the fluid outlet 12 toward the outside of the housing 10 in the closed state, thereby achieving a better sealing effect. This embodiment does not limit this.

[0065] like Figure 2-4 As shown, an elastic element receiving cavity 50 is formed between the end of the first valve core 21 facing the fluid inlet 11 and the baffle 30 along the central axis of the housing 10. A first elastic element 51 is provided in the elastic element receiving cavity 50, and the first elastic element 51 provides a force that moves the second valve core 22 toward the fluid outlet 12.

[0066] In specific implementation, a first elastic element 51 is provided in the elastic element receiving cavity 50. Therefore, in the first aspect, before the water pressure reaches the maximum value that the water supply system can withstand, water flows normally through the valve assembly 1000, and the second valve core 22 is restricted to a designated position. The elastic force provided by the first elastic element 51 allows the first valve core 21 to be actively offset away from the limiting part 40, preventing the first valve core 21 from accidentally contacting the limiting part 40 and causing the second valve core 22 to be released. When the water pressure exceeds this maximum value, the first valve core 21 overcomes the elastic force of the first elastic element 51 and pushes the limiting part 40 to release the second valve core 22. The second valve core 22 is quickly pushed towards the fluid outlet 12 by the elastic force of the first elastic element 51, timely interrupting the water supply. When the water pressure exceeds this maximum value and returns to normal, the operator can use a tool to push the second valve core 22 away from the position of closing the fluid outlet 12. At this time, the elastic force of the first elastic element 51 allows the second valve core 22 to drive the first valve core 21 back to its initial position, saving the operation steps during reset. In addition, in this embodiment, the first elastic element 51 is a compression spring, and the compression spring provides a preloaded elastic force. As an alternative implementation, those skilled in the art can also use elastic elements commonly found in the prior art, such as tension springs or elastic rubber rings, to provide the force that moves the second valve core 22 toward the fluid outlet 12; this embodiment does not limit this. As a further embodiment, those skilled in the art can also provide steps or slots, or other common arrangements in the art, within the elastic element receiving cavity 50 to fix the first elastic element 51, thereby preventing the first elastic element 51 from moving or shaking within the elastic element receiving cavity 50; this embodiment does not limit this.

[0067] like Figure 2-4 As shown, a hook 41 is provided at one end of the limiting part 40 that protrudes from the inner wall of the second valve core 22, and the second valve core 22 is hooked at a designated position by the hook 41.

[0068] A limiting cavity 60 is provided on the outer wall of the housing 10 at the position through which the limiting part 40 passes. A second elastic member 61 is provided in the limiting cavity 60, and the second elastic member 61 provides a force to offset the limiting part 40 away from the second valve core 22.

[0069] In practical implementation, the second valve core 22 is hooked at a designated position by the hook 41, and the engagement between the hook and the second valve core 22 is simple, convenient, and easy to achieve. Simultaneously, the hook design ensures stable and reliable positioning between the limiting part 40 and the second valve core 22, preventing accidental release of the limiting part 40 from the second valve core 22. In this solution, the second elastic member 61 provides a force that displaces the limiting part 40 away from the second valve core 22, thereby enabling the limiting part 40 to be quickly removed from the second valve core 22 when the first valve core 21 pushes the limiting part 40 to release the second valve core 22, resulting in a faster release speed. By providing the elastic member receiving cavity 50, unnecessary movement or shaking of the limiting part 40 and the second elastic member 61 on the valve assembly 1000 is prevented, allowing the second elastic member 61 to more effectively provide the force that displaces the limiting part 40 away from the second valve core 22. Meanwhile, in this embodiment, the limiting part 40 is configured to partially extend outside the limiting receiving cavity 60, thereby facilitating manual adjustment of the limiting part 40 by the operator. In this embodiment, the second elastic element 61 is a compression spring, which provides preloaded elastic force. Alternatively, those skilled in the art can use elastic elements commonly found in the prior art, such as tension springs or elastic rubber rings, to provide the force that causes the limiting part 40 to deflect away from the second valve core 22; this embodiment does not limit this. Furthermore, the valve assembly 1000 in this embodiment uses two sets of limiting units composed of the limiting receiving cavity 60, the limiting part 40, and the second elastic element 61. The two sets of limiting units are arranged on the same axis perpendicular to the central axis of the housing 10, thereby bidirectionally limiting the second valve core 22 to a designated position. Alternatively, other numbers of limiting units besides two sets can be used, such as only one set, or three or four sets of limiting units; this embodiment does not limit this.

[0070] like Figure 2-4 As shown, the valve assembly 1000 also includes a throttling section 13, which is located at the fluid outlet 12 and extends toward the interior of the housing 10 along the central axis of the housing 10.

[0071] In practical implementation, the valve assembly 1000 changes the position of the first valve core 21, altering the size of the flow space formed by the surfaces of the first valve core 21 and the throttling part 13. This, in turn, regulates the flow velocity of the fluid passing through the valve assembly 1000, ensuring a constant total flow rate and achieving a stable flow effect. Furthermore, in this embodiment, the throttling part 13 cooperates with the first valve core 21 and the first elastic element 51. The first valve core 21, through the elastic force provided by the first elastic element, can autonomously adjust and reciprocate, thereby making specific adjustments to the flow space in response to changes in water pressure.

[0072] like Figure 4As shown, when the second valve core 22 closes the fluid outlet 12, the first valve core 21 abuts against the outer edge of the base of the throttling section 13.

[0073] In practical implementation, the inner wall of the first valve core 21 abuts against the base of the throttling section 13, thereby forming a secondary seal between the inner wall of the first valve core 21 and the base of the throttling section 13 while the second valve core 22 seals the fluid outlet 12, thus achieving a better sealing effect for the fluid.

[0074] like Figure 2-4 As shown, a first stop 71 extending toward the interior of the housing 10 is provided at the fluid inlet 11;

[0075] A second stop 72 extending toward the interior of the housing 10 is provided at the fluid outlet 12.

[0076] In specific implementation, the first stop 71 and the second stop 72 prevent the first valve core 21 and the second valve core 22 inside the housing 10 from detaching, thereby preventing the valve assembly 1000 from accidentally disintegrating during use. In this embodiment, the second stop 72 is also the connecting part that connects the throttling part 13 to the housing 10. The second stop 72 is a strip-shaped grid structure, which divides the fluid outlet 12 into multiple openings. In this embodiment, the first stop 71 is a ring structure, which is formed by the housing 10 being turned inwards directly towards the interior of the housing 10. However, in specific implementation, those skilled in the art can also modify or replace the first stop 71 and the second stop 72 according to actual needs by using stop structures commonly used in the art, such as using a grid structure stop, etc. This embodiment does not limit this.

[0077] Not shown in the figure, a water heater includes a valve assembly 1000 of any of the above.

[0078] In practical implementation, the water heater, by being equipped with the aforementioned valve assembly 1000, can prevent parts from cracking and can promptly interrupt the water supply if the parts at the water outlet freeze and crack.

[0079] 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 assembly, characterized in that, The valve assembly includes: A housing, wherein a fluid inlet and a fluid outlet are respectively provided at both ends of the housing; A first valve core and a second valve core are disposed inside the housing. The second valve core is limited to a designated position by a limiting part. When the pressure on the valve assembly reaches a predetermined pressure, the first valve core pushes the limiting part away from the second valve core, thereby the second valve core closes the fluid outlet. The second valve core is disposed around the outside of the first valve core. When the second valve core is in the designated position, the limiting part passes through the outer wall of the housing to the inner wall of the second valve core and protrudes from the inner wall of the second valve core. In this configuration, one end of the first valve core facing the fluid inlet is attached to the inner wall of the second valve core, thereby moving the one end of the first valve core facing the fluid inlet along the inner wall of the second valve core to push the limiting part away from the second valve core.

2. The valve assembly as claimed in claim 1, characterized in that, The second valve core has a baffle at one end facing the fluid outlet, the baffle extending between the inner wall of the housing and the outer wall of the first valve core, the second valve core using the baffle to close the fluid outlet.

3. The valve assembly as claimed in claim 2, characterized in that, An elastic element receiving cavity is formed between the end of the first valve core facing the fluid inlet and the baffle along the central axis of the housing. A first elastic element is disposed in the elastic element receiving cavity, and the first elastic element provides a force that moves the second valve core toward the fluid outlet.

4. The valve assembly as claimed in claim 1, characterized in that, A hook is provided at one end of the limiting part that protrudes from the inner wall of the second valve core, and the second valve core is hooked at a designated position by the hook. And / or, a limiting cavity is provided on the outer wall of the housing at the position through which the limiting part passes, and a second elastic member is provided in the limiting cavity, the second elastic member providing a force to deflect the limiting part away from the second valve core.

5. The valve assembly as claimed in claim 1, characterized in that, The valve assembly further includes a throttling section located at the fluid outlet and extending toward the interior of the housing along the central axis of the housing.

6. The valve assembly as claimed in claim 5, characterized in that, When the second valve core closes the fluid outlet, the first valve core abuts against the outer edge of the base of the throttling section.

7. The valve assembly as claimed in any one of claims 1-6, characterized in that, The fluid inlet is provided with a first stop extending toward the interior of the housing; And / or, the fluid outlet is provided with a second stop extending toward the interior of the housing.

8. A water heater, characterized in that, It includes the valve assembly as described in any one of claims 1-7.

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