Pressure relief drain valve with hot water outlet function

Abstract

The utility model provides a kind of pressure relief drain valve with hot water function, including valve body assembly, valve rod and spring;The upper portion of valve rod is axially movably inserted in the inner cavity of valve body assembly, the lower end of valve rod is fixed with support, spring is sleeved on the outside of valve rod and the both ends of spring respectively abut with support and valve body assembly;The upper end of valve body assembly is provided with water outlet passage, the inside of water outlet passage is provided with one-way valve assembly;Water inlet, water outlet and drain interface that communicate with the inner cavity of valve body assembly are sequentially arranged on the outer wall of valve body assembly from top to bottom, first reduced diameter portion and second reduced diameter portion are sequentially arranged on the outer wall of valve rod from top to bottom with interval;The utility model can directly provide hot water for the water outlet nozzle in coffee machine under the premise of guaranteeing the original function of pressure relief drain valve, such as wastewater discharge before brewing, water supply in brewing cavity and wastewater discharge after brewing.

Description

Technical Field

[0001] This utility model relates to the field of coffee machine accessories technology, and more specifically, to a pressure relief drain valve with hot water dispensing function. Background Technology

[0002] A coffee machine is a device used to brew coffee powder to make coffee. The pressure relief drain valve is an important component in a coffee machine used to control the water used for coffee brewing and to discharge wastewater. For example, Chinese Patent Publication No. CN220185899U discloses a pressure relief drain valve and a coffee machine with the same valve. In this pressure relief drain valve structure, the connection state between multiple channels can be switched by providing different axial forces to the lower end of the valve core. This enables the discharge of wastewater from the boiler front end before brewing, the supply of water to the brewing chamber, and the discharge of wastewater after brewing. In existing coffee machines, in order to provide hot water to users, the coffee machine is equipped with an independent hot water supply circuit. However, since the hot water supply circuit and the water circuit used for brewing coffee in the coffee machine are independent of each other, there are disadvantages such as complex water circuit structure and low integration. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a pressure relief drain valve with hot water function. While ensuring the original functions of the pressure relief drain valve, such as discharging wastewater from the boiler front end before brewing, supplying water to the brewing chamber, and discharging wastewater after brewing, it can also directly provide hot water to the spout of the coffee machine.

[0004] This utility model provides a pressure relief drain valve with hot water output function, including a valve body assembly, a valve stem, and a spring. The upper part of the valve stem is axially movable and inserted into the inner cavity of the valve body assembly. A support is fixed to the lower end of the valve stem. The spring is sleeved on the outside of the valve stem, and both ends of the spring abut against the support and the valve body assembly, respectively. The spring is used to apply a spring force to the valve stem to drive it to move downward relative to the valve body assembly. A water outlet channel is provided at the upper end of the valve body assembly, and a one-way valve assembly is provided inside the water outlet channel. A water inlet, a water outlet, and a drain port communicating with the inner cavity of the valve body assembly are provided on the outer wall of the valve body assembly from top to bottom. A first reduced diameter section and a second reduced diameter section are provided on the outer wall of the valve stem from top to bottom. In the initial state, the valve stem is spring-loaded. When the valve stem is in the lower limit position under the action of force, hot water from the boiler in the coffee machine flows through the gap between the first reduced diameter section and the valve body assembly and the one-way valve assembly and is discharged from the water outlet channel. Waste water from the brewing chamber of the coffee machine is discharged sequentially through the water outlet, the gap between the second reduced diameter section and the valve body assembly, and the drain port. When the valve stem is subjected to axial force and moves upward relative to the valve body assembly to the first position, the water outlet channel stops discharging water, and both the water inlet and outlet are connected to the drain port through the gap between the second reduced diameter section and the valve body assembly. When the valve stem is subjected to axial force and continues to move upward relative to the valve body assembly to the second position, the drain port stops discharging water, and the water outlet remains connected through the gap between the second reduced diameter section and the valve body assembly.

[0005] By adopting the above structure, this utility model, while ensuring the original functions of the pressure relief drain valve in discharging wastewater from the boiler front end before brewing, supplying water to the brewing chamber, and discharging wastewater after brewing, can also directly provide hot water to the spout in the coffee machine, thereby simplifying the water circuit structure of the coffee machine and improving the integration of the coffee machine.

[0006] In one possible implementation, a first seal, a second seal, a third seal, and a fourth seal are sequentially embedded on the inner wall of the valve body assembly from top to bottom. When the valve stem is in the lower limit position, the second seal is tightly sealed against the valve stem located between the first and second reduced diameter portions. When the valve stem is in the first position, the first seal is tightly sealed against the valve stem located between the first and second reduced diameter portions. When the valve stem is in the second position, the first seal is tightly sealed against the valve stem located between the first and second reduced diameter portions, and the third seal is tightly sealed against the valve stem located below the second reduced diameter portion. The fourth seal is used to seal the gap between the valve body assembly and the valve stem located below the drain interface.

[0007] In one possible implementation, the pressure relief drain valve further includes a water outlet connector; the water outlet connector is connected to the upper end of the valve body assembly and is circumferentially sealed to the valve body assembly, and the water outlet connector is in communication with the water outlet channel; an annular protrusion is provided on the inner wall of the water outlet channel, and a water passage hole is formed on the inner side of the annular protrusion; the one-way valve assembly includes an elastic element and a valve core made of soft rubber material; both ends of the elastic element abut against the water outlet connector and the valve core respectively, and the lower end of the valve core abuts against the edge of the upper end of the water passage hole and is used to block the water passage hole.

[0008] In one possible implementation, an annular boss is provided at the upper edge of the water passage, and the inner peripheral wall of the annular boss forms an annular conical surface that is wider at the top and narrower at the bottom. The outer wall surface of the lower end of the valve core forms a spherical surface, and the annular conical surface is used to tightly seal against the outer peripheral wall of the lower end of the valve core.

[0009] In one possible implementation, a number of first ribs are provided on the inner wall of the water outlet channel located at the valve core, which are distributed circumferentially. A first water passage groove is formed between each two adjacent first ribs, and the outer edge of the valve core abuts against the inner sidewall of the number of first ribs.

[0010] In one possible implementation, one end of the water outlet connector is inserted into the upper end of the valve body assembly, and an O-ring is fitted between the water outlet connector and the valve body assembly, thereby sealing the water outlet connector and the valve body assembly circumferentially through the O-ring.

[0011] In one possible implementation, a pair of locking blocks are provided on the outer wall of one end of the water outlet connector, and a pair of locking slots are provided on the inner wall of the upper end of the valve body assembly; when one end of the water outlet connector is engaged with the upper end of the valve body assembly, and after the water outlet connector is rotated relative to the valve body assembly, each locking block is engaged in the corresponding slot to lock the water outlet connector onto the valve body assembly.

[0012] In one possible implementation, the upper end of the valve stem is inserted into the inlet end of the water outlet channel. The inner wall of the inlet end of the water outlet channel is provided with a plurality of second ribs that are circumferentially spaced apart. A second water passage groove is formed between each two adjacent second ribs. The upper end of the valve stem is inserted into the inlet end of the water outlet channel, and the outer wall of the upper end of the valve stem abuts against the inner wall of the plurality of second ribs. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the pressure relief drain valve. Figure 2 This is a second three-dimensional structural diagram of a pressure relief drain valve; Figure 3 This is a three-dimensional sectional view of a pressure relief drain valve when the valve stem is in the lower limit position relative to the valve body assembly. Figure 4 for Figure 3 A magnified structural diagram of point A in the middle; Figure 5 This is a three-dimensional sectional view of the pressure relief drain valve when the valve stem is in the first position relative to the valve body assembly. Figure 6 This is a three-dimensional sectional view of a pressure relief drain valve when the valve stem is in the second position relative to the valve body assembly. Figure 7 A schematic diagram of the first three-dimensional structure of the valve body assembly after removing some of its components; Figure 8 A schematic diagram of the second three-dimensional structure of the valve body assembly after removing part of its structure; Figure 9 A schematic diagram of the third three-dimensional structure of the valve body assembly after removing part of its structure; Figure 10 This is a three-dimensional structural diagram of the water outlet connector. Detailed Implementation

[0014] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0015] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0016] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0017] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0018] See Figures 1-10As shown in the figure, this application discloses a pressure relief drain valve with hot water output function, including a valve body assembly 1, a valve stem 2, and a spring 3; the upper part of the valve stem 2 is axially movable and inserted into the inner cavity of the valve body assembly 1, the lower end of the valve stem 2 is fixed with a support member 21, the spring 3 is sleeved on the outside of the valve stem 2 and the two ends of the spring 3 abut against the support member 21 and the valve body assembly 1 respectively, and the spring 3 is used to apply a spring force to the valve stem 2 to drive the valve stem 2 to move downward relative to the valve body assembly 1; the upper part of the valve body assembly 1... The valve body 1 is provided with a water outlet channel 11, and a one-way valve assembly 4 is provided on the inner side of the water outlet channel 11. The outer wall of the valve body assembly 1 is provided with an inlet port 12, an outlet port 13, and a drain port 14, which communicate with the inner cavity of the valve body assembly 1, arranged from top to bottom. The outer wall of the valve stem 2 is provided with a first reduced diameter portion 22 and a second reduced diameter portion 23, spaced from top to bottom. In the initial state, the valve stem 2 is in the lower limit position under the elastic force of the spring 3. At this time, hot water from the boiler in the coffee machine flows through the first reduced diameter portion... The water is discharged from the outlet channel 11 through the gap between the diameter portion 22 and the valve body assembly 1 and the one-way valve assembly 4. Wastewater from the brewing chamber of the coffee machine is discharged sequentially through the outlet port 13, the gap between the second diameter portion 23 and the valve body assembly 1, and the drain port 14. When the valve stem 2 is subjected to axial force and moves upward relative to the valve body assembly 1 to the first position, the outlet channel 11 stops discharging water, and both the inlet port 12 and the outlet port 13 are connected to the drain port 14 through the gap between the second diameter portion 23 and the valve body assembly 1. When the valve stem 2 is subjected to axial force and continues to move upward relative to the valve body assembly 1 to the second position, the drain port 14 stops discharging water, and the outlet port 13 remains connected through the gap between the second diameter portion 23 and the valve body assembly 1. The upward force of the valve stem is applied by the driving component in the brewing mechanism of the coffee machine. The structure of the driving component in the brewing mechanism pushing the valve stem is the existing technology on the market, so it will not be described in detail here.

[0019] The inner wall of the valve body assembly 1 is sequentially fitted with a first sealing element 51, a second sealing element 52, a third sealing element 53, and a fourth sealing element 54 from top to bottom. When the valve stem 2 is in the lower limit position, the second sealing element 52 is tightly sealed against the valve stem 2 located between the first reduced diameter portion 22 and the second reduced diameter portion 23. When the valve stem 2 is in the first position, the first sealing element 51 is tightly sealed against the valve stem 2 located between the first reduced diameter portion 22 and the second reduced diameter portion 23. When the valve stem 2 is in the second position, the first sealing element 51 is tightly sealed against the valve stem 2 located between the first reduced diameter portion 22 and the second reduced diameter portion 23. The third seal 53 is tightly sealed to the valve stem 2 located below the second reduced diameter portion 23, and the fourth seal 54 is used to seal the gap between the valve body assembly 1 located below the drain port 14 and the valve stem 2. With this structure, when the valve stem 2 is in the lower limit position, the second seal 52 is tightly sealed to the valve stem 2 located between the first reduced diameter portion 22 and the second reduced diameter portion 23, while the first seal 51 and the third seal 53 are in a clearance-fitted state with the valve stem 2. At this time, hot water from the boiler in the coffee machine can flow through the gap between the first reduced diameter portion 22 and the valve body assembly 1. After the one-way valve assembly 4, the hot water is discharged from the outlet channel 11. The hot water discharged from the outlet channel 11 can provide hot water for the coffee machine's spout, and the wastewater from the coffee machine's brewing chamber can be discharged sequentially through the outlet port 13, the gap between the second reduced diameter section 23 and the valve body assembly 1, and the drain port 14. When the valve stem 2 is in the first position, the first seal 51 is tightly sealed to the valve stem 2 located between the first reduced diameter section 22 and the second reduced diameter section 23. The second seal 52 and the third seal 53 are in a state of clearance fit with the valve stem 2. At this time, the first seal 51 can block the water inlet port. Water flow path between 12 and water outlet channel 11, water outlet channel 11 stops flowing out. At the same time, water inlet 12 and water outlet 13 are connected to drain port 14 through the gap between the second reduced diameter part 23 and valve body assembly 1. In this state, the front wastewater from the boiler inside the coffee machine can be discharged sequentially through water inlet 12, the gap between the second reduced diameter part 23 and valve body assembly 1 and drain port 14. Wastewater from the brewing chamber of the coffee machine can be continuously discharged through water outlet 13, the gap between the second reduced diameter part 23 and valve body assembly 1 and drain port 14.When the valve stem 2 is in the second position, the first seal 51 is tightly sealed to the valve stem 2 located between the first reduced diameter portion 22 and the second reduced diameter portion 23, and the third seal 53 is tightly sealed to the valve stem 2 located below the second reduced diameter portion 23. At this time, the first seal 51 can continuously block the water flow path between the water inlet 12 and the water outlet channel 11, so that the water outlet channel 11 remains in a stopped water flow state. At the same time, the third seal 53 is used to block the passage between the water inlet connector 12 and the drain connector 14, and to block the passage between the water outlet connector 13 and the drain connector 14. The drain connector 14 stops discharging wastewater from the front end of the boiler and stops discharging brewing wastewater from the brewing mechanism. In this state, hot water from the boiler can enter the brewing mechanism and brew the coffee powder in the brewing mechanism. That is, this state is the normal brewing state of the coffee machine through the brewing mechanism.

[0020] The pressure relief drain valve also includes a water outlet connector 6; the water outlet connector 6 is connected to the upper end of the valve body assembly 1 and is circumferentially sealed to the valve body assembly 1, and the water outlet connector 6 is connected to the water outlet channel 11; an annular protrusion 111 is provided on the inner wall of the water outlet channel 11, and a water passage hole 112 is formed on the inner side of the annular protrusion 111; the one-way valve assembly 4 includes an elastic element 41 and a valve core 42 made of soft rubber material; the two ends of the elastic element 41 abut against the water outlet connector 6 and the valve core 42 respectively, and the lower end of the valve core 42 abuts against the edge of the upper end of the water passage hole 112 and is used to block the water passage hole 112; with this structure, when the valve stem is in the lower limit position relative to the valve body assembly, water from the coffee machine... Hot water from the boiler can flow through the gap between the first reduced diameter section 22 and the valve body assembly 1 and enter the outlet channel. The water pressure of the hot water entering the outlet channel can act on the lower end of the valve core. At this time, the valve core can overcome the elastic force of the elastic element and move upward. After the valve core moves upward, the hot water can flow through the water passage and be discharged through the outlet connector. When the valve stem is in the first position or the second position relative to the valve body assembly, the hot water from the boiler in the coffee machine cannot enter the outlet channel. At this time, the valve core can move downward and reset under the elastic force of the elastic element, and the lower end of the valve core can abut against the edge of the upper end of the water passage and block the water passage. The elastic element is a spring.

[0021] An annular boss 113 is provided at the upper edge of the water passage 112. The inner peripheral wall of the annular boss 113 forms an annular conical surface 114 that is wider at the top and narrower at the bottom. The outer wall surface of the lower end of the valve core 42 forms a spherical surface. The annular conical surface 114 is used to tightly seal against the outer peripheral wall of the lower end of the valve core 42. With this structure, when the valve core moves downward and resets under the elastic force of the elastic element, the spherical outer wall surface of the lower end of the valve core 42 can abut against the annular conical surface and seal circumferentially. With this sealing structure, it has the advantage of good sealing effect, that is, it has the advantage of good sealing effect of the valve core against the water passage.

[0022] The inner wall of the water outlet channel 11 located at the position of the valve core 42 is provided with a number of first ribs 115 distributed circumferentially. A first water passage groove 116 is formed between each two adjacent first ribs 115. The outer edge of the valve core 42 abuts against the inner sidewall of the number of first ribs 115. With this structure, since the inner sidewall of the number of first ribs abuts against the outer edge of the valve core 42, the reliability and coaxiality of the valve core's up and down movement can be guaranteed when the valve core moves up and down. After the valve core moves upward, hot water can reliably flow through the water outlet channel through the first water passage groove.

[0023] One end of the water outlet connector 6 is inserted into the upper end of the valve body assembly 1. An O-ring 61 is embedded between the water outlet connector 6 and the valve body assembly 1, and the water outlet connector 6 and the valve body assembly 1 are circumferentially sealed by the O-ring 61. With this structure, the O-ring can reliably seal the gap between the water outlet connector and the valve body assembly under the action of the O-ring.

[0024] A pair of locking blocks 62 are provided on the outer wall of one end of the water outlet connector 6, and a pair of locking grooves 15 are provided on the inner wall of the upper end of the valve body assembly 1. When one end of the water outlet connector 6 is engaged with the upper end of the valve body assembly 1, and after the water outlet connector 6 is rotated relative to the valve body assembly 1, each locking block 62 is engaged in the corresponding locking groove 15 to lock the water outlet connector 6 onto the valve body assembly 1. With this structure, the water outlet connector 6 is engaged with the upper end of the valve body assembly 1, and after the water outlet connector 6 is rotated relative to the valve body assembly 1, each locking block 62 is engaged in the corresponding locking groove 15 to lock the water outlet connector 6 onto the valve body assembly 1. This structure has the advantage of convenient locking of the water outlet connector and the valve body assembly.

[0025] The upper end of the valve stem 2 is inserted into the inlet end of the water outlet channel 11. Several second ribs 116 are arranged circumferentially on the inner wall of the inlet end of the water outlet channel 11. A second water passage groove 117 is formed between each two adjacent second ribs 116. The upper end of the valve stem 2 is inserted into the inlet end of the water outlet channel 11, and the outer wall of the upper end of the valve stem 2 abuts against the inner wall of the several second ribs 116. By adopting this structure, the upper end of the valve stem can be supported and radially limited, so that the reliability and coaxiality of the valve stem's up and down movement can be guaranteed. When the valve stem is in the lower limit position relative to the valve body assembly, hot water from the boiler in the coffee machine can reliably enter the water outlet channel through the second water passage groove.

[0026] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A pressure relief drain valve with hot water output function, comprising a valve body assembly (1), a valve stem (2), and a spring (3); the upper part of the valve stem (2) is axially movable and inserted into the inner cavity of the valve body assembly (1), the lower end of the valve stem (2) is fixed with a support member (21), the spring (3) is sleeved on the outside of the valve stem (2) and the two ends of the spring (3) abut against the support member (21) and the valve body assembly (1) respectively, the spring (3) is used to apply a spring force to the valve stem (2) to drive the valve stem (2) to move downward relative to the valve body assembly (1); characterized in that: The upper end of the valve body assembly (1) is provided with a water outlet channel (11), and the inner side of the water outlet channel (11) is provided with a one-way valve assembly (4); the outer wall of the valve body assembly (1) is provided with an inlet port (12), an outlet port (13) and a drain port (14) communicating with the inner cavity of the valve body assembly (1) from top to bottom; the outer wall of the valve stem (2) is provided with a first reduced diameter section (22) and a second reduced diameter section (23) from top to bottom; in the initial state, the valve stem (2) is in the lower limit position under the elastic force of the spring (3). At this time, the hot water from the boiler in the coffee machine flows through the gap between the first reduced diameter section (22) and the valve body assembly (1) and the one-way valve assembly (4) and is discharged from the water outlet channel (11), and the hot water from the coffee machine is discharged from the outlet channel (11). Wastewater in the brewing chamber of the coffee machine is discharged sequentially through the water outlet (13), the gap between the second reduced diameter part (23) and the valve body assembly (1), and the drain outlet (14). When the valve stem (2) is subjected to axial force and moves upward relative to the valve body assembly (1) to the first position, the water outlet channel (11) stops discharging water, and both the water inlet (12) and the water outlet (13) are connected to the drain outlet (14) through the gap between the second reduced diameter part (23) and the valve body assembly (1). When the valve stem (2) is subjected to axial force and continues to move upward relative to the valve body assembly (1) to the second position, the drain outlet (14) stops discharging water, and the water outlet (13) remains connected to the valve body assembly (1) through the gap between the second reduced diameter part (23) and the valve body assembly (1).

2. The pressure relief drain valve with hot water output function according to claim 1, characterized in that: The inner wall of the valve body assembly (1) is sequentially fitted with a first sealing element (51), a second sealing element (52), a third sealing element (53), and a fourth sealing element (54) from top to bottom; when the valve stem (2) is in the lower limit position, the second sealing element (52) is tightly sealed to the valve stem (2) located between the first reduced diameter portion (22) and the second reduced diameter portion (23); when the valve stem (2) is in the first position, the first sealing element (51) is tightly sealed to the valve stem (2) located between the first reduced diameter portion (22) and the second reduced diameter portion (23); The valve stem (2) between the diameter portions (23) is tightly sealed; when the valve stem (2) is in the second position, the first seal (51) is tightly sealed with the valve stem (2) located between the first diameter portion (22) and the second diameter portion (23), and the third seal (53) is tightly sealed with the valve stem (2) located below the second diameter portion (23). The fourth seal (54) is used to seal the gap between the valve body assembly (1) located below the drain port (14) and the valve stem (2).

3. The pressure relief drain valve with hot water output function according to claim 1 or 2, characterized in that: The pressure relief drain valve also includes a water outlet connector (6); the water outlet connector (6) is connected to the upper end of the valve body assembly (1) and is circumferentially sealed to the valve body assembly (1), and the water outlet connector (6) is connected to the water outlet channel (11); an annular protrusion (111) is provided on the inner wall of the water outlet channel (11), and a water passage hole (112) is formed on the inner side of the annular protrusion (111); the one-way valve assembly (4) includes an elastic element (41) and a valve core (42) made of soft rubber material; the two ends of the elastic element (41) abut against the water outlet connector (6) and the valve core (42) respectively, and the lower end of the valve core (42) abuts against the edge of the upper end of the water passage hole (112) and is used to block the water passage hole (112).

4. The pressure relief drain valve with hot water output function according to claim 3, characterized in that: An annular boss (113) is provided at the upper edge of the water passage (112). The inner peripheral wall of the annular boss (113) forms an annular conical surface (114) that is wider at the top and narrower at the bottom. The outer wall surface of the lower end of the valve core (42) forms a spherical surface. The annular conical surface (114) is used to seal tightly against the outer peripheral wall of the lower end of the valve core (42).

5. The pressure relief drain valve with hot water output function according to claim 3, characterized in that: The inner wall of the water outlet channel (11) located at the position of the valve core (42) is provided with a number of first ribs (115) distributed in a circumferentially spaced manner. A first water passage groove (116) is formed between each two adjacent first ribs (115). The outer edge of the valve core (42) abuts against the inner sidewall of the number of first ribs (115).

6. The pressure relief drain valve with hot water output function according to claim 3, characterized in that: One end of the water outlet connector (6) is inserted into the upper end of the valve body assembly (1). An O-ring (61) is embedded between the water outlet connector (6) and the valve body assembly (1). The water outlet connector (6) and the valve body assembly (1) are circumferentially sealed by the O-ring (61).

7. The pressure relief drain valve with hot water output function according to claim 6, characterized in that: A pair of locking blocks (62) are provided on the outer wall of one end of the water outlet connector (6), and a pair of locking grooves (15) are provided on the inner wall of the upper end of the valve body assembly (1). When one end of the water outlet connector (6) is engaged with the upper end of the valve body assembly (1), and after the water outlet connector (6) rotates relative to the valve body assembly (1), each of the locking blocks (62) is engaged in the corresponding locking groove (15) to lock the water outlet connector (6) onto the valve body assembly (1).

8. The pressure relief drain valve with hot water output function according to any one of claims 1-2 or 4-7, characterized in that: The upper end of the valve stem (2) is inserted into the water inlet of the water outlet channel (11). The inner wall of the water inlet of the water outlet channel (11) is provided with several second ribs (116) that are circumferentially spaced. A second water passage groove (117) is formed between each two adjacent second ribs (116). The upper end of the valve stem (2) is inserted into the water inlet of the water outlet channel (11), and the outer wall of the upper end of the valve stem (2) abuts against the inner wall of the several second ribs (116).

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