Flush valve and urinal

Abstract

The flushing valve comprises a valve body, the left end and the right end of the valve body are a water outlet end and a water inlet end respectively, a water passing cavity is formed in the portion, between the water outlet end and the water inlet end, of the valve body, a first pressure relief channel and a second pressure relief channel are arranged on one side of the valve body, one end of the first pressure relief channel is communicated with the water inlet end, and the other end of the first pressure relief channel is sealed through a plug. One end of the second pressure relief channel communicates with the pressure relief hole, the other end of the second pressure relief channel communicates with the water outlet end, a piston and a spring are arranged in the first pressure relief channel, and the piston can move in the axial direction of the first pressure relief channel to open or close communication of the first pressure relief channel and the second pressure relief channel. When the water pressure of the water inlet end is higher than a safety value set by the spring, the spring can be compressed under the water pressure to enable the water outlet end to be communicated with the water inlet end through the pressure relief channel, water flows to the water outlet end through the pressure relief channel, the pressure relief effect is achieved, and burst is prevented.

Description

Technical Field

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

[0002] At present, in order to reduce material costs, some flush valves with non-metallic materials as the main body are available on the market. To ensure the strength of the main body, most of them adopt a structural method of combining metal and non-metal, and there are also those that use all non-metallic materials. Although the flush valve made of non-metallic materials has certain advantages in terms of material costs, it has deficiencies in some performances, especially in high-pressure explosion-proof ability and frost resistance. Most non-metallic materials, such as plastics and composite materials, have relatively low strength and toughness, lack the ductility of metal materials, show greater brittleness under high-pressure conditions, and are prone to fracture or burst. In addition, non-metallic materials become more fragile in low-temperature environments and are more likely to break or rupture. Content of the Utility Model

[0003] The utility model aims to solve at least one of the above technical problems in the related art to a certain extent. For this purpose, the utility model provides a flush valve.

[0004] To achieve the above object, the technical solution of the utility model is as follows:

[0005] The utility model also provides a urinal with the above flush valve.

[0006] The flush valve according to the first aspect embodiment of the utility model includes a valve body. The left and right ends of the valve body are respectively a water outlet end and a water inlet end. A water passing cavity is arranged in the valve body between the water outlet end and the water inlet end. A first pressure relief channel and a second pressure relief channel are arranged on one side of the valve body, and the first pressure relief channel and the second pressure relief channel are located outside the water passing cavity. One end of the first pressure relief channel is communicated with the water inlet end, and the other end is sealed with a plug. A pressure relief hole is opened on the inner side wall of the first pressure relief channel. One end of the second pressure relief channel is communicated with the pressure relief hole, and the other end is communicated with the water outlet end. A piston and a spring are arranged in the first pressure relief channel. The two ends of the spring respectively abut against the plug and the piston. The piston can move axially along the first pressure relief channel to open or close the communication between the first pressure relief channel and the second pressure relief channel.

[0007] The flush valve according to the embodiment of the utility model has at least the following beneficial effects:

[0008] The flushing valve is provided with a pressure relief channel outside the water passing cavity and sealed by a piston. The compression force value of the spring is greater than the standard pressure value required for the design of the flushing valve and less than the limit pressure value that the flushing valve can withstand. When the water pressure at the water inlet end is higher than the safety value set by the spring, the spring will be compressed under the water pressure, so that the water outlet end is communicated with the water inlet end through the pressure relief channel, and water flows to the water outlet end through the pressure relief channel to achieve the pressure relief effect and prevent bursting. When the water pressure returns to the normal value, the spring resets and pushes the piston to seal the pressure relief hole. At the same time, since the flushing drainage volume of the toilet is usually large and the valve closing time is short, very large water hammer is easily generated, resulting in damage to the flushing valve and the water use pipeline. Adding this device can also prevent abnormal water hammer and protect the flushing valve and the water use pipeline. In addition, the flushing valve also has an anti-freezing function. When the water at the water inlet end freezes and the volume expands beyond the safety pressure value designed by the spring, the piston opens to release pressure to prevent freezing and cracking.

[0009] According to some embodiments of the present invention, the piston includes a plugging portion and a guiding portion. Both the plugging portion and the guiding portion are cylindrical, and the outer diameter of the guiding portion is smaller than the outer diameter of the plugging portion, so that a boss structure is formed at the junction of the plugging portion and the guiding portion. The spring abuts against the plugging portion. The first pressure relief channel is divided into a wide-mouth section and a narrow-mouth section according to the outer diameters of the plugging portion and the guiding portion. A limiting structure is formed at the junction of the wide-mouth section and the narrow-mouth section. The guiding portion is located in the narrow-mouth section, and the plugging portion and the pressure relief hole are located in the wide-mouth section.

[0010] According to some embodiments of the present invention, it further includes a solenoid valve assembly. The valve body is provided with a solenoid valve installation port, which is located between the water outlet end and the water inlet end. The solenoid valve installation port is communicated with the water passing cavity. The solenoid valve assembly is installed on the solenoid valve installation port, and the solenoid valve assembly can make the water inlet end and the water outlet end communicate or cut off the flow.

[0011] According to some embodiments of the present invention, the solenoid valve assembly includes a pilot assembly and a pressure balance cavity. The pilot assembly includes a filter base and a filter. The filter base is provided with a pilot hole. The upper end of the pilot hole is communicated with the pressure balance cavity, and the lower end of the pilot hole is communicated with the water passing cavity. The filter is located below the pilot hole, and the filter is fixedly connected to the filter base. The shape of the filter is cylindrical.

[0012] According to some embodiments of the present invention, the filter is a cylindrical structure composed of an annular side surface and a bottom surface, and both the annular side surface and the bottom surface are provided with mesh holes.

[0013] According to some embodiments of the present invention, the filter base is provided with an installation position for installing the filter, and the filter base is provided with a diversion slope, which is gradually inclined upward from the installation position to the outer edge of the filter base.

[0014] According to some embodiments of the present utility model, it further includes a ball valve assembly for regulating the flow rate. A cavity for installing the ball valve assembly is provided in the valve body. The cavity is located between the solenoid valve installation port and the water inlet end, and the ball valve assembly is installed in the cavity.

[0015] According to some embodiments of the present utility model, the ball valve assembly includes a regulating valve rod for regulating the rotation angle of the ball valve. A valve rod installation hole is provided on the valve body. The regulating valve rod is installed in the valve rod installation hole and the upper end of the regulating valve rod partially extends outside the valve rod installation hole. A limiting elastic piece is sleeved on the upper end of the regulating valve rod. Two limiting protrusions are provided at intervals on the outer peripheral edge of the limiting elastic piece. The two limiting protrusions can move circumferentially as the regulating valve rod rotates. A positioning block is provided on the valve body and the positioning block is located near the valve rod installation hole. Rotating the regulating valve rod can make the limiting protrusion abut against the positioning block to prevent the regulating valve rod from rotating.

[0016] According to some embodiments of the present utility model, the flushing valve is a recessed flushing valve. The flushing valve further includes an embedded box. The valve body is installed in the embedded box. Threads are provided on the outer peripheral walls of the water inlet end and the water outlet end of the valve body. The water inlet end and the water outlet end are respectively connected to the water inlet connecting pipe and the water outlet connecting pipe through union nuts. One ends of the water inlet connecting pipe and the water outlet connecting pipe are located in the embedded box, and the other ends extend outside the embedded box. An inductor installation window is opened on the upper end surface of the embedded box. Spaces for the union nuts to move when disassembled are left on the left and right sides inside the embedded box.

[0017] According to some embodiments of the present utility model, the water inlet connecting pipe and the water outlet connecting pipe are made of plastic.

[0018] The urinal according to the second aspect embodiment of the present utility model includes the flushing valve.

[0019] The additional aspects and advantages of the present utility model will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0021] Figure 1 is a sectional view of the valve body of the present utility model;

[0022] Figure 2 is an exploded view of the flushing valve of the present utility model;

[0023] Figure 3 is a sectional view of the flushing valve of the present utility model;

[0024] Figure 4 is a perspective view of the valve body of the present utility model;

[0025] Figure 5 is a schematic structural view of the filter screen of the present utility model;

[0026] Figure 6 is an installation schematic view of the limit elastic piece of the present utility model.

[0027] Reference numerals: valve body 100, water outlet end 110, water inlet end 120, first pressure relief channel 130, second pressure relief channel 140, solenoid valve installation port 160, valve rod installation hole 180, positioning block 190, plug 200, piston 300, sealing portion 310, guiding portion 320, boss structure 330, spring 400, solenoid valve assembly 500, filter screen base 510, diversion inclined surface 511, filter screen 520, pilot hole 530, ball valve assembly 600, regulating valve rod 610, limit elastic piece 700, limit protrusion 710, embedded box 800, inductor installation window 810, union nut 900, water inlet connecting pipe 1000, water outlet connecting pipe 1100. Detailed Description of the Specific Embodiment

[0028] The embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present utility model and should not be construed as limiting the present utility model.

[0029] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

[0030] Refer to Figure 1, a flush valve, comprising a valve body 100, the valve body 100 being made of a non-metallic material. The left and right ends of the valve body 100 are respectively a water outlet end 110 and a water inlet end 120. A water passage chamber is provided inside the valve body 100 between the water outlet end 110 and the water inlet end 120. A first pressure relief passage 130 and a second pressure relief passage 140 are provided on the front side of the valve body 100, and the first pressure relief passage 130 and the second pressure relief passage 140 are located outside the water passage chamber. One end of the first pressure relief passage 130 is communicated with the water inlet end 120, and the other end is sealed with a plug 200. A pressure relief hole is opened on the inner side wall of the first pressure relief passage 130. One end of the second pressure relief passage 140 is communicated with the pressure relief hole, and the other end is communicated with the water outlet end 110. A piston 300 and a spring 400 are provided in the first pressure relief passage 130. The two ends of the spring 400 are respectively abutted against the plug 200 and the piston 300. A sealing ring is provided on the plug 200. The piston 300 can move axially along the first pressure relief passage 130 to open or close the communication between the first pressure relief passage 130 and the second pressure relief passage 140.

[0031] The flush valve is provided with a pressure relief passage outside the water passage chamber and is sealed by the piston 300. The compression force value of the spring 400 is greater than the standard pressure value required for the design of the flush valve and less than the limit pressure value that the flush valve can withstand (for example, the maximum pressure that the flush valve is designed to withstand is 25 kg, and the limit pressure that the flush valve can withstand is 35 kg. The bearing value of its spring 400 can take a safety value between 25 - 35). When the water pressure at the water inlet end 120 is higher than the safety value set by the spring 400, the spring 400 will be compressed under the water pressure, so that the water outlet end 110 is communicated with the water inlet end 120 through the pressure relief passage, and the water flows to the water outlet end 110 through the pressure relief passage, achieving the pressure relief effect and preventing bursting. When the water pressure returns to the normal value, the spring 400 resets and pushes the piston 300 to seal the pressure relief hole.

[0032] In some embodiments of the present invention, the piston 300 includes a blocking portion 310 and a guiding portion 320. Both the blocking portion 310 and the guiding portion 320 are cylindrical, and the outer diameter of the guiding portion 320 is smaller than the outer diameter of the blocking portion 310, so that a boss structure 330 is formed at the junction of the blocking portion 310 and the guiding portion 320. The spring 400 abuts against the blocking portion 310. The first pressure relief passage 130 is divided into a wide-mouth section and a narrow-mouth section according to the outer diameters of the blocking portion 310 and the guiding portion 320. A limiting structure is formed at the junction of the wide-mouth section and the narrow-mouth section. The guiding portion 320 is located in the narrow-mouth section, and a sealing ring is sleeved on the guiding portion 320. The blocking portion 310 and the pressure relief hole are located in the wide-mouth section. In the initial state, the boss structure 330 will abut against the limiting structure for positioning the piston 300 and restricting the movement range of the piston 300.

[0033] In some embodiments of the present invention, refer to Figures 2 - 4, further comprising a solenoid valve assembly 500. A solenoid valve mounting port 160 is provided on the valve body 100. The solenoid valve mounting port 160 is located between the water outlet end 110 and the water inlet end 120 and is communicated with the water passing cavity. The solenoid valve assembly 500 is mounted on the solenoid valve mounting port 160, and the solenoid valve assembly 500 can make the water inlet end 120 and the water outlet end 110 communicate or cut off the flow.

[0034] In some embodiments of the present utility model, referring to Figure 3 and Figure 5 , the solenoid valve assembly 500 includes a pilot assembly and a pressure balance cavity. The pilot assembly includes a filter base 510 and a filter screen 520. A pilot hole 530 is formed on the filter base 510. The upper end of the pilot hole 530 is communicated with the pressure balance cavity, and the lower end of the pilot hole 530 is communicated with the water passing cavity. The filter screen 520 is located below the pilot hole 530, and the filter screen 520 is fixedly connected to the filter base 510. The shape of the filter screen 520 is cylindrical. In the valve in Patent CN111536256A, a filter screen 520 piece is provided at the front end of the pilot hole 530 for filtering impurities in water. The filter screen 520 can protect the valve from being affected by impurities in water when there are fewer impurities in water. However, when there is more sediment in water and the water pressure is higher, it will be blocked, and usually a filtering device needs to be installed at the water inlet end 120 to solve this problem. The main reason for this phenomenon is that the pilot hole 530 is usually very small, usually about a diameter of a few tenths of a millimeter. To prevent impurities from blocking the pilot hole 530, a filter screen 520 with a smaller mesh diameter than the pilot hole 530 is usually provided in front of the pilot hole 530. In the case of poor water quality, if a further filter screen 520 device is not installed at the water inlet end 120, the leakage flow rate of the product will gradually decrease when the valve is slowly closed. Due to the decrease in the leakage flow rate, and the mesh holes of the filter screen 520 are opposite to the water flow direction. When the valve membrane has not completely closed the valve, the water pressure will punch a large amount of impurities and concentrate them at the filter screen 520, resulting in the blockage of the filter screen 520, and water cannot enter the pilot hole 530, resulting in the valve not being able to be completely closed and leaking. The higher the water pressure in the case of very poor water quality, the easier the holes of the filter screen 520 are blocked. Therefore, a filtering device needs to be installed at the water inlet end 120 of the product to form a multi-stage filtration to ensure the product function. The present utility model changes the planar filter screen 520 into a three-dimensional filter screen 520, increasing the mesh area of the filter screen 520 and reducing the blockage situation.

[0035] In some embodiments of the present utility model, the filter screen 520 is a cylindrical structure composed of an annular side surface and a bottom surface. Both the annular side surface and the bottom surface are provided with mesh holes. As Figure 3 shown, the mesh holes of the annular side surface are normal to the water flow direction, and the water outlet direction of the solenoid valve is opposite to the direction in which water enters the filter screen 520 through the annular side surface. Moreover, the leakage flow rate of the solenoid valve is usually much larger than the flow rate of the pilot hole 530. The generated flow rate difference will cause the water flow to flow towards the water outlet direction, thereby reducing the situation of impurities adhering to the side surface of the filter screen 520.

[0036] In some embodiments of the present utility model, an installation position for installing the filter screen 520 is provided on the filter screen base 510. A diversion inclined surface 511 is provided on the filter screen base 510. The diversion inclined surface 511 is gradually inclined upward from the installation position towards the outer edge of the filter screen base 510. The diversion inclined surface 511 can direct the water flow towards the water outlet direction, quickly discharge sediment impurities, prevent sediment from concentrating and converging at the filter screen 520. With the cylindrical filter screen 520 of the present utility model, there is no need to install a filtering device at the front end of the product.

[0037] In some embodiments of the present utility model, it further includes a ball valve assembly 600 for regulating the flow rate. A cavity for installing the ball valve assembly 600 is provided inside the valve body 100. The cavity is located between the solenoid valve installation port 160 and the water inlet end 120, and the ball valve assembly 600 is installed in the cavity. The cavity and the solenoid valve installation port 160 are integrally formed, combining the solenoid valve body 100 and the flow regulating ball valve into one, reducing the splicing points and lowering the risk of water leakage.

[0038] In some embodiments of the present utility model, referring to Figure 6 , the ball valve assembly 600 includes a regulating valve rod 610 for regulating the rotation angle of the ball valve. A valve rod installation hole 180 is provided on the valve body 100. The regulating valve rod 610 is installed in the valve rod installation hole 180 and a part of the upper end of the regulating valve rod 610 extends out of the valve rod installation hole 180. A limiting elastic piece 700 is sleeved on the upper end of the regulating valve rod 610. Two limiting protrusions 710 are provided at intervals on the outer peripheral edge of the limiting elastic piece 700. The two limiting protrusions 710 can move circumferentially as the regulating valve rod 610 rotates. A positioning block 190 is provided on the valve body 100 and the positioning block 190 is located near the valve rod installation hole 180. Rotating the regulating valve rod 610 can make the limiting protrusion 710 abut against the positioning block 190, thereby preventing the regulating valve rod 610 from rotating. The limiting elastic piece 700 is used to limit the regulating angle of the ball valve.

[0039] In some embodiments of the present utility model, the flush valve is a recessed flush valve, and the flush valve further includes an embedded box 800. The valve body 100 is installed in the embedded box 800. Threads are provided on the outer peripheral walls of the valve body 100 at the water inlet end 120 and the water outlet end 110. The water inlet end 120 and the water outlet end 110 are respectively connected to the water inlet connecting pipe 1000 and the water outlet connecting pipe 1100 through union nuts 900. One ends of the water inlet connecting pipe 1000 and the water outlet connecting pipe 1100 are located inside the embedded box 800, and the other ends extend outside the embedded box 800. An inductor installation window 810 is opened on the upper end surface of the embedded box 800. Spaces for the union nuts 900 to move during disassembly are left on the left and right sides inside the embedded box 800. Both sides of the valve body 100 are connected to the pipe connectors through union nuts 900. When it is necessary to replace or repair the flush valve, the union nuts 900 can be loosened through the inductor installation window 810 of the embedded box 800, and the entire valve body 100 can be removed from the inductor installation window 810 for repair and replacement without damaging the wall. Since the union nuts 900 require a certain amount of movement space during disassembly, positioning screw holes are provided on the valve body 100 to cooperate with the screw posts provided in the embedded box 800, so as to ensure sufficient movement space on both sides during the assembly of the flush valve and facilitate disassembly.

[0040] In some embodiments of the present utility model, the water inlet connecting pipe 1000 and the water outlet connecting pipe 1100 are made of plastic. Currently, PPR or PVC pipes are commonly used for water supply pipes in the market, and their connection methods mainly include fusion connection and glue connection. At present, the connection between the induction flush valve and the pipe is mainly through metal nut thread connection, and users need to install an adapter for connection. The connection method is not only troublesome to install, but also the adapter will increase the flow channel resistance and reduce the flushing performance. The present utility model changes the thread connection to plastic pipes such as PPR or PVC, and can be directly connected to the user's pipe system without installing an adapter. Different connection methods can be selected according to the materials of the water inlet connecting pipe 1000 and the water outlet connecting pipe 1100. For example, if the water outlet connecting pipe 1100 uses PVC material, a layer of pipe adhesive can be brushed on the water outlet connecting pipe 1100 and inserted into the corresponding PVC drain pipe to complete the installation. If PPR material is used, hot fusion connection can be carried out through hot fusion devices such as electrofusion. Specifically, the water inlet connecting pipe 1000 or the water outlet connecting pipe 1100 of the flush valve is heated at a high temperature to melt the pipe wall, and then inserted into the plastic pipe. The melted pipe walls are fused and solidified to complete the installation. The use of plastic connecting pipes for the flush valve is more suitable for the current market situation where pipes made of materials such as PPR and PVC are widely used.

[0041] A urinal includes the above-mentioned flush valve.

[0042] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A flush valve, characterized in that: The invention comprises a valve body (100), wherein the left and right ends of the valve body (100) are respectively a water outlet end (110) and a water inlet end (120), a water passage cavity is provided in the valve body (100) between the water outlet end (110) and the water inlet end (120), a first pressure relief channel (130) and a second pressure relief channel (140) are provided on one side of the valve body (100), and the first pressure relief channel (130) and the second pressure relief channel (140) are located outside the water passage cavity, one end of the first pressure relief channel (130) is communicated with the water inlet end (120), and the other end is sealed with a plug (200), A pressure relief hole is provided on the inner wall of the first pressure relief channel (130); one end of the second pressure relief channel (140) is connected to the pressure relief hole, and the other end is connected to the water outlet (110); a piston (300) and a spring (400) are provided in the first pressure relief channel (130); two ends of the spring (400) are respectively in contact with the plug (200) and the piston (300); the piston (300) can move along the axial direction of the first pressure relief channel (130) to open or close the connection between the first pressure relief channel (130) and the second pressure relief channel (140).

2. The flush valve according to claim 1, characterized in that The piston (300) comprises a blocking portion (310) and a guiding portion (320), the blocking portion (310) and the guiding portion (320) are both cylindrical, and the outer diameter of the guiding portion (320) is smaller than the outer diameter of the blocking portion (310), so that a boss structure (330) is formed at the intersection of the blocking portion (310) and the guiding portion (320), the spring (400) abuts against the blocking portion (310), the first pressure relief channel (130) is divided into a wide-mouth section and a narrow-mouth section according to the outer diameters of the blocking portion (310) and the guiding portion (320), a limiting structure is formed at the intersection of the wide-mouth section and the narrow-mouth section, the guiding portion (320) is located in the narrow-mouth section, and the blocking portion (310) and the pressure relief hole are located in the wide-mouth section.

3. The flush valve according to claim 1, characterized in that: The invention also comprises a solenoid valve assembly (500), wherein the valve body (100) is provided with a solenoid valve installation port (160), the solenoid valve installation port (160) is located between the water outlet (110) and the water inlet (120), the solenoid valve installation port (160) is communicated with the water passage chamber, the solenoid valve assembly (500) is installed on the solenoid valve installation port (160), and the solenoid valve assembly (500) can allow flow or intercept flow between the water inlet (120) and the water outlet (110).

4. The flush valve according to claim 3, characterized in that: The solenoid valve assembly (500) comprises a pilot assembly and a pressure balance chamber. The pilot assembly comprises a filter base (510) and a filter (520). The filter base (510) is provided with a pilot hole (530). The upper end of the pilot hole (530) is connected to the pressure balance chamber, and the lower end of the pilot hole (530) is connected to the water passage chamber. The filter (520) is located below the pilot hole (530). The filter (520) is fixedly connected to the filter base (510). The filter (520) is cylindrical in shape.

5. The flush valve according to claim 4, characterized in that The filter screen (520) is a cylindrical structure consisting of an annular side surface and a bottom surface, and both the annular side surface and the bottom surface have mesh holes.

6. The flush valve according to claim 5, characterized in that The filter base (510) is provided with a mounting position for mounting the filter (520), and the filter base (510) is provided with a flow guide slope (511), and the flow guide slope (511) is gradually inclined upward from the mounting position to the outer edge of the filter base (510).

7. The flush valve according to claim 3, characterized in that: It also includes a ball valve assembly (600) for regulating flow, wherein a cavity for installing the ball valve assembly (600) is provided in the valve body (100), the cavity is located between the solenoid valve installation port (160) and the water inlet end (120), and the ball valve assembly (600) is installed in the cavity.

8. The flush valve according to claim 7, characterized in that The ball valve assembly (600) comprises an adjusting valve stem (610) for adjusting the rotation angle of the ball valve. The valve body (100) is provided with a valve stem mounting hole (180). The adjusting valve stem (610) is mounted in the valve stem mounting hole (180) and the upper end of the adjusting valve stem (610) partially extends out of the valve stem mounting hole (180). The upper end of the adjusting valve stem (610) is sleeved with a limiting spring sheet (700). The outer portion of the limiting spring sheet (700) is Two limiting protrusions (710) are spaced apart on the peripheral edge, and the two limiting protrusions (710) can move circumferentially as the regulating valve stem (610) rotates. A positioning block (190) is provided on the valve body (100), and the positioning block (190) is located near the valve stem mounting hole (180). Rotating the regulating valve stem (610) can cause the limiting protrusion (710) to abut against the positioning block (190), thereby preventing the regulating valve stem (610) from rotating.

9. The flush valve according to claim 7, characterized in that: The flush valve is a concealed flush valve, and further comprises an embedded box (800). The valve body (100) is installed in the embedded box (800). The outer peripheral walls of the valve body (100) located at the water inlet end (120) and the water outlet end (110) are provided with threads. The water inlet end (120) and the water outlet end (110) are respectively connected to the water inlet connecting pipe (1000) and the water outlet connecting pipe (1100) through a union nut (900). One end of the water inlet connecting pipe (1000) and the water outlet connecting pipe (1100) are located in the embedded box (800), and the other end extends out of the embedded box (800). The upper end surface of the embedded box (800) is provided with a sensor installation window (810). Space required for the union nut (900) to move when disassembling is reserved on the left and right sides of the embedded box (800).

10. A urinal, characterized in that: A flush valve comprising the flush valve according to any one of claims 1-9.

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