A valve for a water heater

Abstract

The utility model provides a valve for water heater belongs to valve technical field. It solved the problem of poor applicability while having the function of loose joint. It includes the valve body of water inlet end and water outlet end respectively at upper and lower ends, and the valve body side portion has pressure relief end and cleaning end, the pressure relief end is connected with safety valve, the first valve core is equipped in the cleaning end, the water inlet end periphery side is equipped with rotatable loose joint cap, the upper end of loose joint cap is connected with mounting head in internal thread, the upper end of mounting head stretches out loose joint cap, the upper end of mounting head is equipped with internal thread, the lower end of mounting head is equipped with abutting step on the inboard side, the first sealing washer is arranged on the abutting step, and the second valve core is equipped in the water outlet end. It has the advantages of wide applicability while having the function of loose joint.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology and relates to a valve for water heaters. Background Technology

[0002] Water heaters have hot water inlets and cold water inlets. Cold water flows into the water heater through the cold water inlet, is heated inside to form hot water, and then flows out through the hot water inlet. Usually, the cold water inlet is directly connected to the pipe, while the hot water inlet is connected to the pipe through a valve. This valve has a pressure relief function, which can release pressure when the temperature or pressure is too high to ensure safety.

[0003] For example, a liquid injection safety valve for a solar water heater disclosed in patent application number 202220296092.2 includes a liquid injection section and a safety valve section. The liquid injection section is located on one side of the valve body. The structure of the liquid injection section is that a ball valve core is installed in the valve body, and a ball valve handle is connected to the ball valve core. The ball valve core is fixed to an O-ring seal in the valve body by a plug. The safety valve section is located on the side of the valve body opposite to the liquid injection section. The safety valve section has a valve stem that extends into the valve body, and a safety valve plug is installed at the end of the valve body. A safety valve handle is connected to the valve stem on the outside. A pressure relief port is also provided on the valve body at this location. On the other side of the valve body, a connector is connected to the valve body, and a nut is installed on the outside of the connector. The nut is an internally threaded union nut, and the medium inlet is connected to the medium pipe of the water tank through the internally threaded union nut. In use, connect the liquid injection safety valve of this solar water heater to the hot water outlet interface on the water heater. Specifically, connect the internal threaded union nut to the hot water outlet interface. Hot water flows out of the water heater and through the liquid injection safety valve into the water pipe. When the pressure is too high, the safety valve automatically opens to release pressure. Furthermore, after prolonged use, the inside of the water heater needs to be cleaned. Connect the cleaning agent line to the main body, and turn the ball valve handle to open the cleaning agent line between the ball valve core and the valve body, allowing the cleaning agent to enter the water heater for cleaning.

[0004] However, in reality, the interface specifications on water heaters vary in size, and although the union nut can achieve the union function, it is only suitable for one type of interface. When faced with different interface specifications, the union nut must be replaced, thus resulting in insufficient applicability. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a valve for water heaters that solves the problem of poor applicability while possessing a flexible connection function.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] A valve for a water heater includes a valve body with an inlet and an outlet at its upper and lower ends, respectively. The valve body has a pressure relief end and a cleaning end on its side. A safety valve is connected to the pressure relief end. A first valve core is provided inside the cleaning end. A rotatable union nut is provided on the outer periphery of the inlet end. The valve body is characterized in that an installation head is internally threaded to the upper end of the union nut. The upper end of the installation head extends out of the union nut and has an internal thread. An abutment step is provided on the inner side of the lower end of the installation head. A first sealing gasket is abutted on the abutment step. A second valve core is provided inside the outlet end.

[0008] The upper end of the union nut is internally threaded with an installation head. The upper end of the installation head extends beyond the union nut and is also internally threaded. This allows the valve, originally designed for water heaters, to be compatible with various interface sizes. Specifically, for smaller interfaces, the internal thread at the top of the installation head is used to mate with the interface. The lower inner side of the installation head has a step for abutting, and a first sealing washer is placed on this step. This allows the interface to abut against the first sealing washer, achieving a seal between the installation head and the interface. Since the installation head is connected to the union nut, it still functions as a union. For larger interfaces, the user can remove the installation head from the union nut, then remove the first sealing washer from the installation head and place it inside the union nut against the inlet end. The union nut is then directly mated with the interface, again with the first sealing washer abutting against the interface to achieve a seal. The above settings improve the applicability of valves originally designed for water heaters while also providing a flexible connection function.

[0009] In addition, the valve designed for water heaters is equipped with a second valve core inside the outlet end. Before cleaning the water heater, the second valve core can be operated to completely isolate the valve designed for water heaters from the user's main pipeline. Then, the first valve core can be operated to open the cleaning end and allow the cleaning agent to enter the valve designed for water heaters through the cleaning end. This can prevent the cleaning agent from entering the water supply pipeline and causing pollution.

[0010] In the valve for a water heater described above, a second sealing gasket is abutted between the lower end face of the mounting head and the end face of the water inlet. The lower end face of the mounting head has a protruding annular extension, and the lower outer periphery of the extension has an annular lug. The annular lug and the lower end face of the mounting head cooperate to form an annular groove, and the inner edge of the second sealing gasket is stuck in the annular groove.

[0011] The second sealing gasket serves to seal the water inlet end between the mounting head and the valve body, preventing hot water leakage from this point when the mounting head is connected to the interface. Furthermore, the inner edge of the second sealing gasket is fitted into an annular groove formed by the mating of the annular lug and the lower end face of the mounting head. When the mounting head is removed from the union nut, the second sealing gasket is also removed, allowing the first sealing gasket, which rests on the abutment step, to be removed from the mounting head and installed inside the union nut.

[0012] In one of the valves used in a water heater described above, the upper end of the mounting head is hexagonal.

[0013] The upper end of the mounting head extends beyond the union nut. The upper end of the mounting head is hexagonal, which makes it easy to disassemble the mounting head with tools such as wrenches.

[0014] In the aforementioned valve for a water heater, the union nut is fitted over the water inlet end, a retaining spring is provided on the inner side of the lower end of the union nut, and an annular shoulder is provided on the outer periphery of the water inlet end, with the retaining spring abutting against the lower side of the annular shoulder.

[0015] In the aforementioned valve for a water heater, the valve body includes a tubular body with a flared lower end and a connector threaded to the lower end of the body. The second valve core is a ball core and is limited by the connector to the lower end of the body. The pressure relief end and the cleaning end are integrally arranged on the side of the body. A second control rod is also provided in the water outlet end of the valve body. One end of the second control rod is connected to the second valve core, and the other end of the second control rod extends out of the side of the water outlet end and is connected to a second operating handle.

[0016] The second valve core is a ball core. This not only allows the valve originally intended for the water heater to be completely isolated from the user's main pipe before cleaning, but also allows the flow rate of hot water supplied from the water heater to the main pipe to be adjusted.

[0017] In the aforementioned valve for a water heater, the safety valve includes a main body with a pressure relief port on the side. One end of the main body is threaded into the pressure relief port, and the other end of the main body is open with a ring-shaped end cap threaded into its inner side. An adjusting ring is threaded into the inner side of the end cap. A valve hole is provided inside the main body along the direction perpendicular to the valve body axis. A pressure relief mechanism is provided inside the main body. The pressure relief mechanism includes a valve stem assembly arranged along the direction perpendicular to the valve body axis, a spring sleeved on the outside of the valve stem assembly, and a sleeve with one open end. The outer end of the valve stem assembly passes through the adjusting ring. The sleeve is made of flexible material. The spring is located inside the sleeve. The inner end of the valve stem assembly passes through the closed end of the sleeve and seals the valve hole. The valve stem assembly is fixed to the sleeve. The two ends of the spring abut against the adjusting ring and the valve stem assembly, respectively. An annular flange is provided on the outer periphery of the open end of the sleeve. The annular flange is clamped and fixed between the end cap and the inner wall of the main body.

[0018] The spring force acts on the valve stem assembly, causing its inner end to seal the valve orifice. Some hot water enters the main body from the valve body and acts on the valve stem assembly through the valve orifice. When the hot water pressure is less than the spring force, the valve stem assembly remains in the sealed orifice state. When the hot water pressure exceeds the spring force, the valve stem assembly is pushed open, opening the valve orifice. The hot water that entered the main body then flows out through the pressure relief port to release pressure. After pressure relief, the valve stem assembly is once again sealed by the spring force. The spring is located inside the sheath, which is a cylindrical shape with one open end and made of flexible material. The inner end of the valve stem assembly passes through the closed end of the sheath and the two are fixed together. An annular flange is provided on the outer periphery of the open end of the sheath, clamping and fixing it between the end cap and the inner wall of the main body. This allows the sheath to deform in accordance with the movement of the valve stem assembly, while completely isolating the spring from water. This prevents scale buildup on the spring and ensures stable operation over long-term use, guaranteeing consistent pressure relief from the safety valve. In particular, when cleaning agents are used to flush the water heater, the sheath prevents the spring from contacting the chemicals in the cleaning agent, extending its lifespan and ensuring stable operation over extended use.

[0019] In addition, the spring force is usually adjusted by rotating the end cap, but here the end cap is used to fix the sheath. Therefore, by setting the end cap in a ring shape and threading an adjusting ring on the inside of the end cap, the spring rests against the adjusting ring. In this way, the spring force can be adjusted normally by rotating the adjusting ring.

[0020] In the aforementioned valve for a water heater, the valve stem assembly includes a valve stem with an annular protrusion at its inner end, a connecting sleeve fitted onto the inner end of the valve stem and located inside a sheath, a connector with its outer end passing through the sheath and threaded into the connecting sleeve, a pressure cap with its opening facing away from the sheath and fitted onto the inner end of the connector, and a third sealing gasket embedded in the opening of the pressure cap. The outer end of the connecting sleeve is fastened onto the annular protrusion, the closed end of the sheath is clamped between the connecting sleeve and the pressure cap, a spring abuts against the connecting sleeve, and the third sealing gasket abuts against the valve hole to seal it.

[0021] During assembly, first, slip the connecting sleeve from the outer end of the valve stem onto the annular protrusion on the inner end of the valve stem. Then, place the valve stem and connecting sleeve inside the protective sleeve. Next, attach the gland to the connector, allowing the connector to pass through the closed end of the protective sleeve and be threaded into the inner end of the connecting sleeve. This clamps and fixes the closed section of the protective sleeve between the connecting sleeve and the gland, thus forming a connection where the valve stem assembly passes through and is fixed to the closed end of the protective sleeve. Therefore, after the spring is fitted onto the valve stem assembly, the protective sleeve completely isolates the spring from the water, ensuring that the spring never comes into contact with it.

[0022] The above configuration allows the valve stem assembly and sheath to be assembled into a single unit outside the main body, and then installed into the main body of the safety valve, making assembly more convenient.

[0023] In the aforementioned valve for a water heater, an annular shoulder is provided near its opening in the main body, the outer edge of the annular flange abuts against the annular shoulder and the end cap, an annular groove is provided on the annular shoulder, and the outer edge of the annular flange is embedded in the annular groove.

[0024] An annular shoulder is provided inside the main body near its opening. This annular shoulder, in conjunction with the end cap, clamps and secures the annular flange of the sheath. Simultaneously, an annular groove is provided on the annular shoulder, and the outer edge of the annular flange is embedded within the groove, thus achieving a good sealing effect.

[0025] Compared with existing technologies, the valve used in water heaters has the following advantages:

[0026] 1. An installation head is connected to the upper end of the union nut with an internal thread. The upper end of the installation head extends out of the union nut and has an internal thread. This allows the valve, originally intended for water heaters, to be compatible with different sized interfaces. For smaller interfaces, the internal thread on the upper end of the installation head can be used to connect with the interface. For larger interfaces, the user can remove the installation head from the union nut, then remove the first sealing washer from the installation head and place it inside the union nut against the end of the water inlet. Then, the union nut can be used to directly connect with the interface. This improves the applicability of the valve, which is originally intended for water heaters, while providing a union function.

[0027] 2. The spring in the safety valve is located inside the protective sleeve. The sleeve is a cylindrical shape with one open end and is made of flexible material. The inner end of the valve stem assembly passes through the closed end of the sleeve and the two are fixed together. An annular flange is provided on the outer periphery of the open end of the sleeve, clamping and fixing it between the end cap and the inner wall of the main body. This allows the sleeve to deform in accordance with the movement of the valve stem assembly, while completely isolating the spring from water. This prevents scale buildup on the spring, ensuring stable operation over long-term use and guaranteeing consistent pressure relief from the safety valve. In particular, when cleaning agents are used to flush the water heater, the sleeve prevents the spring from contacting the chemicals in the cleaning agent, extending its lifespan and ensuring stable operation over extended use. Attached Figure Description

[0028] Figure 1 This is a three-dimensional schematic diagram of a valve used in water heaters.

[0029] Figure 2 This is a cross-sectional view of a valve used in a water heater.

[0030] Figure 3 yes Figure 2 A magnified view of a portion of the union nut.

[0031] Figure 4 yes Figure 2 Sectional view along the AA direction.

[0032] Figure 5 yes Figure 2 Sectional view along the BB direction.

[0033] In the diagram, 1. Valve body; 1a. Pressure relief end; 1b. Cleaning end; 1c. Annular shoulder; 1d. Body; 1e. Connector; 2. Safety valve; 3. First valve core; 4. Union nut; 5. Snap ring; 6. Mounting head; 6a. Abutment step; 6b. Extension; 6c. Annular lug; 6d. Annular groove; 7. First sealing washer; 8. Second sealing washer; 9. First control lever; 10. First operating handle; 11. Second valve core ; 12. Second control lever; 13. Second operating handle; 14. Main body; 14a. Pressure relief port; 14b. Valve hole; 14c. Annular shoulder; 14d. Annular groove; 15. End cap; 16. Adjusting ring; 17. Valve stem assembly; 18. Spring; 19. Sheath; 19a. Annular flange; 20. Valve stem; 20a. Annular protrusion; 21. Connecting sleeve; 22. Connector; 23. Pressure cap; 24. Third sealing gasket. Detailed Implementation

[0034] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0035] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a valve for a water heater includes a valve body 1 with an inlet and an outlet at its upper and lower ends, respectively. The valve body 1 has a pressure relief end 1a and a cleaning end 1b on its side. A safety valve 2 is connected to the pressure relief end 1a, and a first valve core 3 is located inside the cleaning end 1b. A union nut 4 is sleeved on the inlet end. A retaining spring 5 is located on the inner side of the lower end of the union nut 4, and an annular shoulder 1c is located on the outer periphery of the inlet end. The retaining spring 5 abuts against the lower side of the annular shoulder 1c. An installation head 6 is internally threaded onto the upper end of the union nut 4. The upper end of the installation head 6 extends beyond the union nut 4 and has an internal thread. An abutment step 6a is located on the inner side of the lower end of the installation head 6, and a first sealing washer 7 is abutted on the abutment step 6a. A second sealing gasket 8 is abutting against the lower end face of the mounting head 6 and the end face of the water inlet. An annular extension 6b protrudes from the lower end face of the mounting head 6. An annular lug 6c is provided on the outer periphery of the lower end of the extension 6b. The annular lug 6c and the lower end face of the mounting head 6 cooperate to form an annular groove 6d. The inner edge of the second sealing gasket 8 is stuck in the annular groove 6d. The upper end of the mounting head 6 is hexagonal.

[0036] The upper end of the union nut 4 is internally threaded with a mounting head 6. The upper end of the mounting head 6 extends out of the union nut 4 and has an internal thread, which makes the valve originally intended for water heaters applicable to different interface sizes. Specifically, for small-sized interfaces, the internal thread at the upper end of the mounting head 6 is used to mate with the interface. The lower inner side of the mounting head 6 has an abutment step 6a, on which a first sealing washer 7 is abutted. This allows the interface to abut against the first sealing washer 7, achieving a seal between the mounting head 6 and the interface. Since the mounting head 6 is connected to the union nut 4, it still retains its union function. For larger-sized interfaces, the user can remove the mounting head 6 from the union nut 4, then remove the first sealing washer 7 from the mounting head 6 and place it inside the union nut 4 against the end of the water inlet. The union nut 4 is then directly mated with the interface, again with the first sealing washer 7 abutting against the interface to achieve a seal. Through these modifications, the valve, originally designed for water heaters, not only retains its union function but also improves its applicability.

[0037] like Figure 1 and Figure 2 As shown, the first valve core 3 is a ball core. A first control rod 9 is also provided inside the cleaning end 1b. One end of the first control rod 9 is connected to the first valve core 3, and the other end extends out of the cleaning end 1b and is connected to a first operating handle 10. A second valve core 11, also a ball core, is provided inside the water outlet. A second control rod 12 is also provided inside the water outlet. One end of the second control rod 12 is connected to the second valve core 11, and the other end extends out of the side of the water outlet and is connected to a second operating handle 13. The second valve core 11 inside the water outlet allows control of the connection or disconnection of the water outlet. Before cleaning the water heater, the second valve core 11 can be operated to completely isolate the valve intended for the water heater from the user's main pipeline. Then, the first valve core 3 can be operated to open the cleaning end 1b and allow the cleaning agent to enter the valve body 1 through the cleaning end 1b, thus preventing the cleaning agent from entering the water supply pipeline and causing contamination. In practice, the water pressure of the cleaning agent is lower than the opening pressure of the safety valve 2, so the cleaning agent will not flow out from the safety valve 2 after entering the valve body 1. In this embodiment, the valve body 1 includes a tubular body 1d with a flared lower end and a connector 1e with its upper end threaded into the lower end of the body 1d. The second valve core 11 is limited by the connector 1e in the lower end of the body 1d. The pressure relief end 1a and the cleaning end 1b are both integrally disposed on the side of the body 1d.

[0038] Specifically, such as Figure 5As shown, the safety valve 2 includes a body 14, with a pressure relief port 14a on its side. One end of the body 14 is threaded into the pressure relief port 1a, and the other end of the body 14 is open with an end cap 15 threaded onto its inner side. A valve hole 14b is provided inside the body 14 along the direction perpendicular to the axis of the valve body 1, connecting the interior of the valve body 1 to the pressure relief port 14a. A pressure relief mechanism is provided inside the body 14 to control the closing or opening of the valve hole 14b. The end cap 15 is annular, and an adjusting ring 16 is threaded onto its inner side. The pressure relief mechanism includes a valve stem assembly 17 arranged along the axis perpendicular to the valve body 1, a spring 18 sleeved on the outside of the valve stem assembly 17, and a sleeve 19 with one open end. The outer end of the valve stem assembly 17 passes through the adjusting ring 16. The sleeve 19 is made of flexible material. The spring 18 is located inside the sleeve 19. The inner end of the valve stem assembly 17 passes through the closed end of the sleeve 19 and seals the valve hole 14b. The valve stem assembly 17 is fixed to the sleeve 19. The two ends of the spring 18 abut against the adjusting ring 16 and the valve stem assembly 17, respectively. The outer periphery of the open end of the sleeve 19 is provided with an annular flange 19a. The annular flange 19a is clamped and fixed between the end cap 15 and the inner wall of the main body 14.

[0039] The spring force of spring 18 acts on valve stem assembly 17, causing the inner end of valve stem assembly 17 to block valve hole 14b. Some hot water enters the main body 14 from valve body 1 and acts on the inner end of valve stem assembly 17 via valve hole 14b. When the hot water pressure is less than the spring force of spring 18, valve stem assembly 17 remains in the blocked valve hole 14b state. When the hot water pressure is greater than the spring force of spring 18, valve stem assembly 17 is pushed open, causing valve hole 14b to open, allowing the hot water entering the main body 14 to flow out through pressure relief port 14a to relieve pressure. After pressure relief, valve stem assembly 17 is again blocked by spring 18. It should be noted that the spring 18 is located inside the sleeve 19. The sleeve 19 is a cylindrical shape with one open end and is made of flexible material. The inner end of the valve stem assembly 17 passes through the closed end of the sleeve 19 and the two are fixed together. An annular flange 19a is provided on the outer periphery of the open end of the sleeve 19. The annular flange 19a is clamped and fixed between the end cap 15 and the inner wall of the main body 14. This allows the sleeve 19 to cooperate with the action of the valve stem assembly 17 through its own deformation. The sleeve 19 also completely isolates the spring 18 so that it does not come into contact with water. As a result, scale will not form on the spring 18, ensuring that it can work stably during long-term use, thereby ensuring that the safety valve 2 can always release pressure stably. Since the end cap 15 is used to clamp the annular flange 19a of the fixed sleeve 19, the end cap 15 is made into an annular shape and an adjusting ring 16 is threaded to the inside of the end cap 15. The spring 18 rests against the adjusting ring 16. In this way, the elastic force of the spring 18 can be adjusted by rotating the adjusting ring 16, thereby adjusting the pressure relief pressure.

[0040] In this embodiment, as Figure 5 As shown, the valve stem assembly 17 includes a valve stem 20 with an annular protrusion 20a at its inner end, a connecting sleeve 21 sleeved on the inner end of the valve stem 20 and located inside the sheath 19, a connector 22 whose outer end passes through the sheath 19 and is threaded into the connecting sleeve 21, a pressure cap 23 with its opening facing away from the sheath 19 and sleeved on the inner end of the connector 22, and a third sealing gasket 24 embedded in the opening of the pressure cap 23. The connecting sleeve 21 is fastened to the annular protrusion 20a, the closed end of the sheath 19 is clamped between the connecting sleeve 21 and the pressure cap 23, the spring 18 abuts against the connecting sleeve 21, and the third sealing gasket 24 abuts against the valve hole 14b to seal it. The main body 14 has an annular shoulder 14c near its opening. The outer edge of the annular flange 19a abuts between the annular shoulder 14c and the end cap 15. The annular shoulder 14c has an annular groove 14d. The outer edge of the annular flange 19a is embedded in the annular groove 14d.

[0041] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A valve for a water heater, comprising a valve body (1) with an inlet and an outlet at its upper and lower ends respectively, wherein the valve body (1) has a pressure relief end (1a) and a cleaning end (1b) on its side, a safety valve (2) is connected to the pressure relief end (1a), a first valve core (3) is provided inside the cleaning end (1b), and a rotatable union nut (4) is provided on the outer periphery of the inlet end, characterized in that, The upper end of the union nut (4) is internally threaded with a mounting head (6). The upper end of the mounting head (6) extends out of the union nut (4). The upper end of the mounting head (6) is provided with an internal thread. The lower end of the mounting head (6) is provided with an abutting step (6a). A first sealing washer (7) is abutted on the abutting step (6a). A second valve core (11) is provided inside the water outlet.

2. A valve for a water heater according to claim 1, characterized in that, A second sealing gasket (8) is abutted between the lower end face of the mounting head (6) and the end face of the water inlet. An annular extension (6b) is protruding from the lower end face of the mounting head (6). An annular lug (6c) is provided on the outer periphery of the lower end of the extension (6b). The annular lug (6c) and the lower end face of the mounting head (6) cooperate to form an annular groove (6d). The inner edge of the second sealing gasket (8) is stuck in the annular groove (6d).

3. A valve for a water heater according to claim 2, characterized in that, The upper end of the mounting head (6) is hexagonal.

4. A valve for a water heater according to claim 3, characterized in that, The union nut (4) is fitted over the water inlet end. A retaining ring (5) is provided on the inner side of the lower end of the union nut (4). An annular shoulder (1c) is provided on the outer periphery of the water inlet end. The retaining ring (5) abuts against the lower side of the annular shoulder (1c).

5. A valve for a water heater according to claim 1, 2, 3, or 4, characterized in that, The valve body (1) includes a tubular body (1d) with a flared lower end and a connector (1e) with its upper end threaded into the lower end of the body (1d). The second valve core (11) is a ball core and is limited by the connector (1e) to the lower end of the body (1d). The pressure relief end (1a) and the cleaning end (1b) are integrally arranged on the side of the body (1d). The outlet end of the valve body (1) is also provided with a second control rod (12). One end of the second control rod (12) is connected to the second valve core (11), and the other end of the second control rod (12) extends out of the side of the outlet end and is connected to a second operating handle (13).

6. A valve for a water heater according to claim 5, characterized in that, The safety valve (2) includes a main body (14) with a pressure relief port (14a) on the side. One end of the main body (14) is threaded into the pressure relief port (1a). The other end of the main body (14) is open and has an annular end cap (15) threaded into it. An adjusting ring (16) is threaded into the inner side of the end cap (15). A valve hole (14b) is provided in the main body (14) along the direction perpendicular to the axis of the valve body (1). A pressure relief mechanism is provided in the main body (14). The pressure relief mechanism includes a valve stem assembly (17) arranged along the direction perpendicular to the axis of the valve body (1), a spring (18) sleeved on the outside of the valve stem assembly (17), and an end cap (14b) open at one end. The sleeve (19) is cylindrical in shape. The outer end of the valve stem assembly (17) passes through the adjusting ring (16). The sleeve (19) is made of flexible material. The spring (18) is located inside the sleeve (19). The inner end of the valve stem assembly (17) passes through the closed end of the sleeve (19) and seals the valve hole (14b). The valve stem assembly (17) is fixed to the sleeve (19). The two ends of the spring (18) abut against the adjusting ring (16) and the valve stem assembly (17) respectively. The outer periphery of the open end of the sleeve (19) is provided with an annular flange (19a). The annular flange (19a) is clamped and fixed between the end cap (15) and the inner wall of the main body (14).

7. A valve for a water heater according to claim 6, characterized in that, The valve stem assembly (17) includes a valve stem (20) with an annular protrusion (20a) at its inner end, a connecting sleeve (21) fitted inside the valve stem (20) and located inside the sheath (19), a connector (22) whose outer end passes through the sheath (19) and is threaded into the connecting sleeve (21), a pressure cap (23) with its opening facing away from the sheath (19) and fitted onto the inner end of the connector (22), and a third sealing gasket (24) embedded in the opening of the pressure cap (23). The outer end of the connecting sleeve (21) is fastened to the annular protrusion (20a), the closed end of the sheath (19) is clamped between the connecting sleeve (21) and the pressure cap (23), a spring (18) abuts against the connecting sleeve (21), and the third sealing gasket (24) abuts against the valve hole (14b) to seal it.

8. A valve for a water heater according to claim 7, characterized in that, The main body (14) has an annular shoulder (14c) near its opening. The outer edge of the annular flange (19a) abuts against the annular shoulder (14c) and the end cap (15). The annular shoulder (14c) has an annular groove (14d), and the outer edge of the annular flange (19a) is embedded in the annular groove (14d).

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