Safety valve and water heater

Abstract

The utility model discloses a safety valve and a water heater, the safety valve comprises a valve body and an outer leakage valve core, the valve body is provided with an inner leakage cavity, a connecting port and an outer leakage port, and the connecting port and the outer leakage port are communicated with the inner leakage cavity; the leakage valve element is arranged on the valve body and has an opening state for opening the leakage opening and a closing state for closing the leakage opening, the valve body is provided with a first matching part, the leakage valve element is provided with a second matching part, the first matching part is arranged around the leakage opening, and in the closing state, the second matching part and the first matching part are matched in an abutting mode to seal the leakage opening; at least one of the first matching part and the second matching part is provided with an anti-corrosion structure used for limiting electrochemical corrosion between the first matching part and the second matching part. According to the safety valve, electric corrosion between the leakage valve element and the valve body can be avoided or reduced, the stability of the safety valve is improved, and the service life of the safety valve is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a safety valve and a water heater. Background Art

[0002] In the related art, the safety valve used in electric water heaters opens the leakage channel during the heating process as the pressure in the electric water heater tank increases and reaches the leakage pressure opening value. The leakage water reduces the pressure in the tank to protect the tank. During long-term use, local corrosion problems occur at the leakage port, causing premature pressure relief and dripping. Utility Model Content

[0003] One purpose of the utility model is to provide a safety valve and a water heater, which can avoid or reduce the electrical corrosion between the leakage valve core and the valve body, and extend the stability and service life of the safety valve.

[0004] According to an embodiment of the present invention, the safety valve includes a valve body and an external leakage valve core, the valve body having an internal leakage cavity and a connecting port and an external leakage port connected to the internal leakage cavity; the external leakage valve core is arranged on the valve body, and has an open state for opening the external leakage port and a closed state for closing the external leakage port, wherein the valve body has a first matching portion, and the external leakage valve core has a second matching portion, the first matching portion is arranged around the external leakage port, and in the closed state the second matching portion abuts and matches with the first matching portion to close the external leakage port, and at least one of the first matching portion and the second matching portion is provided with an anti-corrosion structure for limiting electrochemical corrosion between the first matching portion and the second matching portion.

[0005] The safety valve according to the embodiment of the present utility model can avoid or reduce the electrical corrosion between the leakage valve core and the valve body, thereby extending the stability and service life of the safety valve.

[0006] In addition, the safety valve according to the above embodiment of the present invention may also have the following additional technical features:

[0007] In some embodiments, the valve body includes a valve main body, the first matching portion and the valve main body are split structures, and the first matching portion is connected to the valve main body.

[0008] In some embodiments, the valve body is provided with a mounting opening, and at least a portion of the first fitting portion is disposed in the mounting opening.

[0009] In some embodiments, the mounting port has a first part and a second part that are connected along the axial direction, the second part is provided with a positioning notch, the positioning notch is recessed relative to the inner circumference of the first part, a part of the first matching part is passed through the first part, and the outer circumference of the first matching part is provided with a positioning protrusion extending into the positioning notch.

[0010] In some embodiments, the first portion is closer to the internal leakage cavity than the second portion; or, the second portion is closer to the internal leakage cavity than the first portion; or, the first mating portion is threadedly connected to the first portion.

[0011] In some embodiments, the first fitting portion is connected to the valve body by interference fit, gluing, welding or threading.

[0012] In some embodiments, the valve body includes a valve main body, and the first fitting portion and the valve main body are an integral structure.

[0013] In some embodiments, the first mating portion is provided with a first anti-corrosion coating, and in the closed state, the second mating portion abuts against the first anti-corrosion coating; or, the first mating portion is configured as a structure made of an anti-corrosion material.

[0014] In some embodiments, the second mating portion is provided with a second anti-corrosion coating, and in the closed state the second anti-corrosion coating is in abutment with the first mating portion; or, the second mating portion is configured as a structure made of an anti-corrosion material.

[0015] In some embodiments, the external leakage valve core is arranged on the outside of the internal leakage cavity, and the first matching portion includes a convex rib, which is arranged on the surface of the peripheral wall of the external leakage port away from the internal leakage cavity and is arranged around the external leakage port.

[0016] In some embodiments, the second matching portion includes a spring washer disposed at an end of the leakage valve core.

[0017] According to an embodiment of the present invention, the water heater comprises: an inner tank and the aforementioned safety valve, wherein the inner tank has a water storage chamber and a water inlet communicating with the water storage chamber; and the connecting port is connected to the water inlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of a safety valve according to an embodiment of the present invention.

[0019] Figure 2 yes Figure 1 Top view of .

[0020] Figure 3 yes Figure 1 Left view of .

[0021] Figure 4 It is a cross-sectional view of a safety valve according to an embodiment of the present invention.

[0022] Reference numerals:

[0023] Safety valve 10, valve body 11, valve main body 111, first matching portion 112, positioning protrusion 1121, connecting port 1101, external leakage port 1102, internal leakage port 1103, first interface 1104, second interface 1105, internal leakage cavity 1106, external leakage cavity 1107, internal leakage valve core 12, first seat body 121, first return member 122, second return member 123, first valve core 124, first spring washer 125, pressure relief hole 126, external leakage valve core 13, second valve seat 131, second valve core 132, third return member 133, compression sleeve 134, cavity 135, second matching portion 136, filter element 141, end cover 142, handle 143, slide groove 144, slider 145. DETAILED DESCRIPTION

[0024] The safety valve body can be made of copper, which has low hardness, and the thickness of the anti-corrosion electroplating process inside the valve body is difficult to control. The inside of the leakage port works when the pressure in the inner tank reaches the leakage value and is in a high-temperature and high-pressure water environment. The uneven anti-corrosion plating layer makes it difficult to form effective anti-corrosion protection. Under the scouring action of high-temperature and high-pressure water, there is a scouring gap on the inside of the leakage port; the outside of the leakage port is in a harsh environment of dry-wet cycle, which accelerates corrosion and causes corrosion gaps. When the corrosion gaps inside and outside the leakage port are connected, the sealing surface of the leakage channel fails, and the pressure is released and leaks in advance.

[0025] The following describes in detail embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0026] like Figures 1 to 4 The safety valve 10 according to an embodiment of the present invention includes a valve body 11 and a drain valve core 13. The valve body 11 has an internal drain cavity 1106, a connection port 1101 communicating with the internal drain cavity 1106, and an external drain port 1102. The connection port 1101 can be connected to a water heater and communicate with the water storage chamber of the water heater, so that water in the water storage chamber can flow into the internal drain cavity 1106 through the connection port 1101.

[0027] The leakage valve core 13 is provided on the valve body 11 and has an open state in which the leakage port 1102 is opened and a closed state in which the leakage port 1102 is closed. In the closed state, the leakage valve core 13 closes the leakage port 1102, and the water in the water storage chamber cannot be discharged through the leakage port 1102; in the open state, the leakage valve core 13 opens the leakage port 1102, and the water in the water storage chamber will be discharged through the leakage port 1102, thereby utilizing the leakage port 1102 to relieve the pressure of the water storage chamber.

[0028] The valve body 11 has a first mating portion 112, and the drain valve core 13 has a second mating portion 136. The first mating portion 112 is disposed around the drain port 1102. In the closed state, the second mating portion 136 abuts and engages with the first mating portion 112, sealing the drain port 1102. Thus, the drain port 1102 can be opened and closed by the contact and separation of the second mating portion 136 and the first mating portion 112. In the open state, the second mating portion 136 separates from the first mating portion 112, opening the drain port 1102; in the closed state, the second mating portion 136 abuts the first mating portion 112, closing the drain port 1102.

[0029] At least one of the first mating portion 112 and the second mating portion 136 is provided with an anti-corrosion structure. Optionally, the first mating portion 112 is provided with an anti-corrosion structure; the second mating portion 136 is provided with an anti-corrosion structure; or both the first mating portion 112 and the second mating portion 136 are provided with an anti-corrosion structure. The provision of the anti-corrosion structure can limit electrochemical corrosion between the first mating portion 112 and the second mating portion 136, thereby improving the stability of the safety valve 10 and extending the service life of the safety valve 10.

[0030] According to the safety valve 10 of the embodiment of the present invention, by providing an anti-corrosion structure, it is possible to avoid or reduce the occurrence of electrical corrosion between the first matching portion 112 and the second matching portion 136, thereby avoiding or reducing the electrical corrosion between the leakage valve core 13 and the valve body 11, and avoiding the problem of premature pressure relief and dripping due to local corrosion at the leakage port 1102 after the water heater has been used for a period of time, thereby extending the stability and service life of the safety valve 10.

[0031] like Figure 4 In some embodiments, the valve body 11 includes a valve main body 111, and the first mating portion 112 and the valve main body 111 are of a separate structure, with the first mating portion 112 connected to the valve main body 111. With the separate design, only the first mating portion 112 needs to be treated with anti-corrosion treatment. Moreover, the first mating portion 112 can be installed after the anti-corrosion treatment, thereby facilitating the provision of an anti-corrosion structure on the first mating portion 112, simplifying the production and molding of the valve body 11, reducing the cost of the safety valve 10, and reducing the amount of anti-corrosion material used, thereby reducing costs, energy conservation, and environmental protection.

[0032] In the present invention, there are multiple ways to connect the first matching part 112 and the valve body 111. For example, the first matching part 112 is stacked on the valve body 111, etc. The present invention provides some implementation methods to achieve the connection between the first matching part 112 and the valve body 111, but this is not a limitation on the scope of protection of the present invention.

[0033] like Figure 4In some examples, the valve body 111 is provided with a mounting opening, and at least a portion of the first mating portion 112 is disposed within the mounting opening. Thus, the first mating portion 112 can be mounted in the mounting opening to achieve connection between the first mating portion 112 and the valve body 111, thereby improving the efficiency and stability of the connection between the first mating portion 112 and the valve body 111.

[0034] The mounting opening comprises a first portion and a second portion that communicate along the axial direction. The second portion is provided with a positioning notch that is recessed relative to the inner circumference of the first portion. A portion of the first mating portion 112 is disposed through the first portion, and the outer circumference of the first mating portion 112 is provided with a positioning protrusion 1121 that extends into the positioning notch. Thus, when the first mating portion 112 is mounted on the valve body 111, the engagement of the positioning protrusion 1121 with the positioning notch can limit the position of the first mating portion 112, allowing the first mating portion 112 to be quickly and stably mounted on the valve body 111, thereby improving the installation efficiency and stability of the first mating portion 112 after installation.

[0035] Alternatively, the first portion can be positioned closer to the internal leakage cavity 1106 than the second portion, that is, the first mating portion 112 can be mounted to the mounting opening from the outside of the internal leakage cavity 1106. Of course, in the present invention, the second portion can also be positioned closer to the internal leakage cavity 1106 than the first portion, so that the first mating portion 112 can be mounted to the mounting opening from the inside of the internal leakage cavity 1106.

[0036] Optionally, the first mating portion 112 is threadedly connected to the first part, which makes it convenient for the first mating portion 112 to be installed to the mounting port by threading, thereby improving the installation efficiency and effect of the first mating portion 112 and the valve body 111, and improving the mating stability between the positioning protrusion 1121 and the positioning notch.

[0037] In addition, the positioning notch can be set as a ring extending along the circumference of the installation port. Of course, the positioning notch can also be set as a plurality of positioning notches distributed at intervals along the circumference of the installation port; the positioning protrusion 1121 can be set as a ring extending along the circumference of the installation port. Of course, the positioning protrusion 1121 can also be set as a plurality of positioning protrusions distributed at intervals along the circumference of the installation port.

[0038] In some examples, the first mating portion 112 and the valve body 111 are connected by interference fit. For example, a mounting port is provided in the valve body 111, and at least a portion of the first mating portion 112 is embedded in the mounting port by interference fit.

[0039] In addition, the first matching portion 112 and the valve body 111 may also be connected by gluing, welding or threaded connection, or the connection between the first matching portion 112 and the valve body 111 may also be a combination of the above connection methods.

[0040] In other embodiments of the present invention, the valve body 11 includes a valve main body 111, and the first mating portion 112 is integrally formed with the valve main body 111. By integrating the valve body 11 and the first mating portion 112, the strength of the connection structure between the valve main body 111 and the first mating portion 112 can be improved, thereby improving the structural strength and stability of the valve body 11.

[0041] In addition, the anti-corrosion structure in the present invention can be a coating, or the first matching portion 112 and / or the second matching portion 136 can be made of an anti-corrosion material. The first matching portion 112 and the second matching portion 136 in the present invention include but are not limited to the following embodiments.

[0042] In the first embodiment, the first matching portion 112 is provided with a first anti-corrosion coating, and in the closed state, the second matching portion 136 abuts against the first anti-corrosion coating.

[0043] In the second embodiment, the first matching portion 112 is configured to be made of an anti-corrosion material.

[0044] In the third embodiment, the second matching portion 136 is provided with a second anti-corrosion coating, and in the closed state, the second anti-corrosion coating abuts and matches with the first matching portion 112 .

[0045] In the fourth embodiment, the second matching portion 136 is configured to be made of an anti-corrosion material.

[0046] Of course, the first matching portion 112 and the second matching portion 136 in the present invention can also be configured as a combination of the aforementioned different embodiments.

[0047] like Figure 4 In some embodiments, the external leakage valve core 13 is disposed outside the internal leakage cavity 1106. The first mating portion 112 includes a rib disposed on a surface of the peripheral wall of the external leakage opening 1102 that faces away from the internal leakage cavity 1106 and surrounds the external leakage opening 1102. In the closed position, the second mating portion 136 can abut against the rib to seal the external leakage opening 1102, thereby improving the sealing effect of the external leakage opening 1102 and enhancing the stability of the safety valve 10.

[0048] The ribs may be made of anti-corrosion materials.

[0049] In some embodiments, the second matching portion 136 includes a spring washer disposed at the end of the leakage valve core 13, which can further improve the sealing effect of the leakage port 1102 in the closed state.

[0050] The utility model separates the external leakage port 1102 from the valve body 111 and applies an anti-corrosion coating to the local structure of the external leakage port 1102. The anti-corrosion coating includes but is not limited to metal anti-corrosion plating and polymer anti-corrosion and anti-scaling coating. The local structure of the external leakage port 1102 is fixedly connected to the valve body 111 by interference fit or gluing.

[0051] According to the safety valve 10 of the embodiment of the present utility model, it can include a valve body 11, an internal leakage valve core 12 and an external leakage valve core 13, wherein the valve body 11 is provided with an internal leakage cavity 1106 and an external leakage cavity 1107, and further has a connecting port 1101, an internal leakage port 1103, an external leakage port 1102, a first interface 1104 and a second interface 1105, the connecting port 1101 is used to connect the inner tank of the water heater, the internal leakage port 1103 can be connected to and closed with the internal leakage cavity 1106, and the external leakage port 1102 is provided between the internal leakage cavity 1106 and the external leakage cavity 1107, wherein the internal leakage valve core 12 is provided in the internal leakage cavity 1106, and the external leakage valve core 13 is provided in the external leakage cavity 1107.

[0052] The internal leakage valve core 12 may include a first seat body 121, a first reset member 122, a first valve core 124, and a first spring washer 125. The first valve seat includes an end plate and a cylinder. The end plate is connected to one end of the cylinder. The end plate is provided with a pressure relief hole 126. The first valve core 124 includes a valve stem and a valve disc. The valve disc is provided below the pressure relief hole 126 and is used to open and close the pressure relief hole 126. The lower end of the valve stem is connected to the valve disc and is provided through the pressure relief hole 126 and the cylinder. The first reset member 122 connects the first valve core 124 and the first seat body 121 and has an elastic force that drives the first valve core 124 to close the pressure relief hole 126. The first elastic member is provided below the end plate. The periphery of the valve disc is provided with a protrusion. When the first valve core 124 closes the pressure relief hole 126, the protrusion abuts the first spring washer 125 to close the pressure relief hole 126.

[0053] A filter element 141 and a second restoration element 123 are also provided in the internal leakage cavity 1106. The second restoration element 123 can elastically drive the first base body 121 and make the first elastic closed internal leakage port 1103. The second restoration element 123 can abut between the second restoration element 123 and the first base body 121, and the filter element 141 can be provided above the first base body 121.

[0054] When the pressure of the internal leakage port 1103 is greater than that of the internal leakage cavity 1106, the internal leakage port 1103 will be opened by overcoming the second reset member 123; when the pressure of the internal leakage cavity 1106 is greater than that of the internal leakage port 1103, the first valve core 124 can be driven to separate from the first valve seat by overcoming the first reset member 122 to open the pressure relief hole 126.

[0055] The valve body 11 includes a valve main body 111 and a first matching portion 112. The valve main body 111 is provided with a mounting port, which is provided between the internal leakage cavity 1106 and the external leakage cavity 1107. The first matching portion 112 is installed at the mounting port, and the external leakage port 1102 is provided at the first matching portion 112. The side of the first matching portion 112 facing away from the internal leakage cavity 1106 is provided with a convex rib, which is configured in a ring shape surrounding the external leakage port 1102. The first matching portion 112 is surface-anti-corrosion treated.

[0056] The leakage valve core 13 includes a second valve seat 131, a second spring washer (second mating portion 136), a second valve core 132, a third reset member 133, and a compression sleeve 134. The second spring washer is located on the second valve seat 131 and opposite the first mating portion 112. The second valve seat 131 and the compression sleeve 134 are spaced apart along the axis of the leakage port 1102. The compression sleeve 134 is fixedly connected to the valve body 11. The third reset member 133 is located between the second valve seat 131 and the compression sleeve 134. A cavity 135 is defined within the second valve seat 131. The second valve core 132 is disposed through the second valve seat 131 and the compression sleeve 134. One end of the second valve core 132 extends into the cavity 135 and is provided with a flange. The second valve core 132 is movable within the cavity 135 along the axis of the leakage port 1102.

[0057] The external leakage cavity 1107 extends along the axis of the external leakage port 1102, and an end cap 142 is provided at one end facing away from the internal leakage cavity 1106. The other end of the second valve core 132 passes through the end cap 142 and extends out of the end cap 142. The safety valve 10 also includes a control handle 143 connected to the other end of the second valve core 132. The other end of the second valve core 132 is provided with a slide 144, which extends along the axis of the external leakage port 1102. The handle 143 is provided with a slider 145, which is rotatably and slidably disposed in the slide 144. The handle 143 can be rotated to press against the end cap 142, thereby controlling the separation of the second spring washer from the first mating portion 112, thereby opening the external leakage port 1102.

[0058] Furthermore, when the pressure within the internal leakage cavity 1106 is high, the pressure of the third restoring member 133 can be overcome to drive the second spring washer away from the first mating portion 112, thereby opening the external leakage port 1102. A drain port is provided on the peripheral wall of the external leakage cavity 1107, which communicates with the internal leakage cavity 1106 and remains connected to the internal leakage cavity 1106 when the external leakage port 1102 is open.

[0059] The water heater according to the embodiment of the present invention includes: an inner tank and the aforementioned safety valve 10, the inner tank having a water storage chamber and a water inlet connected to the water storage chamber; the connecting port 1101 is connected to the water inlet.

[0060] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0061] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0062] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0063] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0064] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0065] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A safety valve, characterized in that: include: A valve body, the valve body having an internal leakage cavity and a connecting port communicating with the internal leakage cavity and an external leakage port; The leakage valve core is provided in the valve body and has an open state for opening the leakage port and a closed state for closing the leakage port. In which, the valve body has a first matching part, and the leakage valve core has a second matching part. The first matching part is arranged around the leakage port. In the closed state, the second matching part abuts and cooperates with the first matching part to close the leakage port. At least one of the first matching part and the second matching part is provided with an anti-corrosion structure for limiting electrochemical corrosion between the first matching part and the second matching part.

2. The safety valve according to claim 1, characterized in that: The valve body includes a valve main body, the first matching portion and the valve main body are a split structure, and the first matching portion is connected to the valve main body.

3. The safety valve according to claim 2, characterized in that: The valve body is provided with a mounting opening, and at least a portion of the first matching portion is provided in the mounting opening.

4. The safety valve according to claim 3, characterized in that: The mounting port has a first part and a second part that are connected along the axial direction, the second part is provided with a positioning notch, the positioning notch is recessed relative to the inner circumference of the first part, a part of the first matching part is passed through the first part, and the outer circumference of the first matching part is provided with a positioning protrusion that extends into the positioning notch.

5. The safety valve according to claim 4, characterized in that: The first portion is closer to the internal leakage cavity than the second portion; or the second portion is closer to the internal leakage cavity than the first portion; or the first matching portion is threadedly connected to the first portion.

6. The safety valve according to claim 2, characterized in that: The first fitting portion is connected to the valve body by interference fit, gluing, welding or threaded connection.

7. The safety valve according to claim 1, characterized in that The valve body includes a valve main body, and the first matching portion and the valve main body are an integrated structure.

8. The safety valve according to claim 1, characterized in that The first matching portion is provided with a first anti-corrosion coating, and in the closed state, the second matching portion is in abutment with the first anti-corrosion coating; or, the first matching portion is configured as a structure made of an anti-corrosion material.

9. The safety valve according to claim 1 or 8, characterized in that: The second matching portion is provided with a second anti-corrosion coating, and in the closed state, the second anti-corrosion coating is in abutment with the first matching portion; or, the second matching portion is configured as a structure made of an anti-corrosion material.

10. The safety valve according to any one of claims 1 to 8, characterized in that: The external leakage valve core is arranged on the outside of the internal leakage cavity, and the first matching portion includes a convex rib, which is arranged on the surface of the peripheral wall of the external leakage port away from the internal leakage cavity and is arranged around the external leakage port; And / or, the second matching portion includes a spring washer provided at the end of the leakage valve core.

11. A water heater, characterized in that: include: An inner liner, the inner liner having a water storage cavity and a water inlet communicating with the water storage cavity; The safety valve according to any one of claims 1 to 10, wherein the connecting port is connected to the water inlet.

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