A water treatment filtration system and four-way valve thereof

Abstract

The present invention relates to a water treatment and filtering system and a four-way valve thereof. The water treatment and filtering system comprises a four-way valve, a sand filter, a normal water pipe, a filtering water pipe, a solenoid valve and a sewage pipe. There are at least three four-way valves, which are installed above the sand filter. Each four-way valve is provided with a water inlet, a water outlet, a filtering port and a sewage outlet. When all the sand filters are filtering normally, water enters the sand filter through the four-way valve and is filtered and then discharged to the filtering water pipe. When the solenoid valve is opened, purified water after filtration is discharged from the filtering water pipe. When one of the sand filters is backwashed and the other sand filters are filtering normally, the solenoid valve closes the filtering water pipe, and water discharged from the filtering ports of the other four-way valves flows through the filtering water pipe into the filtering ports of the four-way valves corresponding to the backwashing and cleaning sand filters. After the water is pressurized to clean the sand filters, it is discharged to the sewage pipe through the sewage outlet. The pipeline layout is convenient and fast, ensuring that the backwashing water pressure effectively cleans the sand filter, saving costs and meeting actual use needs.

Description

Technical Field

[0001] The present invention relates to the field of water treatment equipment, and in particular to a water treatment filtration system and a four-way valve thereof. Background Art

[0002] A sand filter, also known as a quartz sand filter, uses quartz sand as a filter medium. Under pressure, it filters turbid water through a layer of granular or non-granular sand of a certain thickness, effectively intercepting and removing suspended solids, organic matter, colloidal particles, microorganisms, chlorine, odors, and some heavy metal ions. This highly efficient filtration device ultimately reduces turbidity and purifies water quality. Sand filters require a valve to effectively treat and purify water. The valve, installed above the sand filter, primarily switches the flow direction between normal operation and backwash water. When the sand filter valve is operating normally, water flows through the side channels of the valve into the sand filter's inner filter layer. The sand filter intercepts impurities in the water, then passes through the filter layer and flows to the center of the sand filter. The water is then discharged through the valve's filtered water outlet, where it is filtered water. When the sand filter requires backwashing, the valve switches the internal flow channel, allowing water to enter the center of the valve through the filtered water outlet. This backwashes impurities from the filter layer and is then discharged through the drain outlet. The drawback of this traditional water treatment filtration system is that when multiple sand filters are to work together, multiple valves cannot be used in series, and a large number of pipes need to be laid to transport water to each valve individually. The assembly is very complicated and cannot work quickly. The structural design is very limited and the water flow direction cannot be flexibly changed according to usage requirements. The convenience and flexibility of use are insufficient. Moreover, since backwashing requires a large water pressure to flush the quartz sand, many water pumps are required, and the manufacturing cost is very high. Summary of the Invention

[0003] In view of the defects of the existing water treatment and filtration systems, such as the need to lay multiple pipelines and insufficient backwash water pressure, the present invention provides a water treatment and filtration system and a four-way valve thereof. The specific technical solutions are as follows:

[0004] A water treatment and filtration system includes a four-way valve, a sand filter, a normally open water pipe, a filtered water pipe, a solenoid valve, and a sewage pipe. There are at least three four-way valves, which are installed above the sand filter. The number of sand filters corresponds to the number of four-way valves. Each four-way valve is provided with a water inlet, a water outlet, a filter port, and a sewage outlet. The water inlet and outlet of a single four-way valve are normally open through the valve cavity inside the four-way valve. Water enters through the water inlet of the first four-way valve, and the water outlet of the previous four-way valve is connected to the water inlet of the next four-way valve through the normally open water pipe. The water outlet of the last four-way valve is blocked and closed. The filter port of each four-way valve is connected in parallel to the filtered water pipe. A solenoid valve is installed at the end of the filtered water pipe. The sewage outlet of each four-way valve is connected in parallel to the sewage pipe.

[0005] When all sand filters are filtering normally, water enters the sand filter through the four-way valve and is filtered and then discharged to the filter water pipe. When the solenoid valve is opened, the purified water after filtration is discharged from the filter water pipe.

[0006] When one of the sand filters is backwashed and cleaned and the other sand filters are filtering normally, the four-way valve corresponding to the backwashing sand filter switches the internal pipeline, the solenoid valve closes the filter water pipe, and the water discharged from the filter port of the other four-way valves flows into the filter port of the four-way valve corresponding to the backwashing sand filter through the filter water pipe. After the water boosts the sand filter, it is discharged through the sewage outlet to the sewage pipe.

[0007] Preferably, the above-mentioned water treatment filtration system has three four-way valves and three sand filters respectively. Water enters through the water inlet of the first four-way valve, the water outlet of the first four-way valve is connected to the water inlet of the second four-way valve through a normal water pipe, the water outlet of the second four-way valve is connected to the water inlet of the third four-way valve through a normal water pipe, the water outlet of the third four-way valve is blocked and closed, the filter ports of the three four-way valves are connected in parallel through the filter pipe, and the sewage outlets of the three four-way valves are connected in parallel to the sewage pipe.

[0008] Preferably, the above-mentioned water treatment and filtration system has four four-way valves and four sand filters respectively. Water enters through the water inlet of the first four-way valve, the water outlet of the first four-way valve is connected to the water inlet of the second four-way valve through a normal water pipe, the water outlet of the second four-way valve is connected to the water inlet of the third four-way valve through a normal water pipe, the water outlet of the third four-way valve is connected to the water inlet of the fourth four-way valve through a normal water pipe, the water outlet of the fourth four-way valve is blocked and closed, the filter ports of the four four-way valves are connected in parallel to the filter pipe, and the sewage outlets of the four four-way valves are connected in parallel to the sewage pipe.

[0009] 2. The diaphragm of claim 1, wherein the diaphragm is affixed to a valve core and a valve stem. The diaphragm is affixed to a valve cavity and a water inlet is connected to the water outlet via the valve cavity. The diaphragm is driven by a motor to rotate the valve core through the transmission mechanism. The diaphragm is installed in the lower part of the valve cavity. The diaphragm is provided with a filter port and a sewage outlet via the valve core. An arc-shaped valve port and a central valve port for inserting a sand filter are provided below the valve body. The central valve port is connected to the filter port. When the sand filter is filtering normally, the valve cavity is connected to the arc-shaped valve port through the valve core, and water is discharged through the water inlet, the valve cavity, the valve core, the arc-shaped valve port, the sand filter, the central valve port, and the filter port in sequence. At this time, the discharged water is purified water after filtering. When the sand filter is backwashed and cleaned, the valve core rotates to make the valve cavity and the arc-shaped valve port non-conductive. The arc-shaped valve port is connected to the sewage outlet through the valve core, and water is discharged through the filter port, the central valve port, the sand filter, the arc-shaped valve port, the valve core, and the sewage outlet in sequence. At this time, the discharged water is sewage after backwashing.

[0010] As a preferred solution of the four-way valve, the valve core includes an upper valve disc, a middle valve disc and a lower valve disc. The upper valve disc and the lower valve disc are fixedly installed in the valve cavity. The middle valve disc is located between the upper valve disc and the lower valve disc. The valve stem drives the middle valve disc to rotate. The upper valve disc is provided with an upper closed port and an upper open port, the middle valve disc is provided with a middle closed port and a middle open port, and the lower valve disc is provided with a lower closed port and a lower opening. When the sand filter is filtering normally, the upper opening, the middle opening and the lower opening are aligned, and the valve cavity is connected to the arc valve port through the valve core. When the sand filter is backwashed and cleaned, the valve stem drives the middle valve disc to rotate 180 degrees, the upper closed port, the middle opening and the lower opening are aligned, and the arc valve port is connected to the sewage outlet through the valve core.

[0011] As a preferred solution for the four-way valve, there are three upper closed ports and one upper opening, the upper closed port and the upper opening are arc-shaped with the same shape, and are arranged circumferentially around the central axis of the upper valve disc. There is one middle closed port and one middle opening, the middle closed port and the middle opening are arc-shaped with the same shape, and are arranged circumferentially around the central axis of the middle valve disc. A partition bar is provided in the middle of the middle closed port, and the partition bar divides the middle closed port into two. There is one lower closed port and three lower openings, the lower closed port and the lower opening are arc-shaped with the same shape, and are arranged circumferentially around the central axis of the upper valve disc.

[0012] As an optimal solution for the four-way valve, a circular hole is provided at the center of the middle valve plate, the front and rear sides of the circular hole are connected to the groove, and a step is provided at the bottom of the valve stem. When the valve stem is inserted into the circular hole, the step is embedded in the groove.

[0013] As a preferred solution for the four-way valve, a motor fixing shell is installed above the valve body, a motor is installed at the bottom of the motor fixing shell, the motor is installed in the motor cavity of the valve body, the transmission mechanism includes a pinion and a large gear, the pinion is installed on the motor output shaft, the pinion engages with the large gear, and the large gear is installed on the top of the valve stem.

[0014] As a preferred solution of the four-way valve, the water inlet, water outlet, filter port and sewage outlet are respectively provided with internal threads for easy connection to pipelines.

[0015] The beneficial effects of the present invention are as follows: the water inlet and the water outlet of a single four-way valve are normally connected through the internal valve cavity of the four-way valve, the water outlet of the previous four-way valve is connected to the water inlet of the next four-way valve through the normally connected water pipe, and the water outlet of the last four-way valve is blocked and closed, so that multiple four-way valves are finally connected in series without the need to separately set up multiple inlet and outlet pipes. The pipeline layout is convenient and fast, and during backwashing, the water pressure of the water discharged by the other normally working sand filters is used to ensure that the backwash water pressure effectively cleans the sand filter, and there is no need to add a water pump to increase the pressure on the filter water pipe, which saves costs and meets actual use needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of water flow during filtration by the water treatment and filtration system of the present invention;

[0017] Figure 2 Schematic diagram of water flow during backwashing of the water treatment and filtration system of the present invention;

[0018] Figure 3 This is a structural diagram of a four-way valve installed on a sand filter;

[0019] Figure 4 is a perspective view of a four-way valve of the present invention;

[0020] Figure 5 is a three-dimensional diagram of the four-way valve of the present invention from another perspective;

[0021] Figure 6 is an exploded view of the four-way valve of the present invention;

[0022] Figure 7 is a top view of the four-way valve of the present invention in the filtering state;

[0023] Figure 8 yes Figure 7 Cross-sectional view in the AA direction;

[0024] Figure 9 yes Figure 7 Cross-sectional view in the middle BB direction;

[0025] Figure 10 1. It is a top view of the four-way valve of the present invention in the backwash state;

[0026] Figure 11 yes Figure 10 Cross-sectional view in CC direction;

[0027] Figure 12 yes Figure 10 Cross-sectional view in the middle DD direction;

[0028] Figure 13 is an exploded view of the valve core of the four-way valve of the present invention;

[0029] Figure 14 It is a three-dimensional view of the upper valve plate of the four-way valve of the present invention;

[0030] Figure 15 It is a three-dimensional diagram of the middle valve plate of the four-way valve of the present invention;

[0031] Figure 16 is a three-dimensional diagram of the lower valve plate of the four-way valve of the present invention;

[0032] Figure 17 It is a three-dimensional diagram of the valve body and the sealing ring of the four-way valve of the present invention. DETAILED DESCRIPTION

[0033] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0034] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the position or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0035] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0036] like Figures 1 to 3 As shown, a water treatment and filtration system includes a four-way valve 01, a sand filter 02, a normal water pipe 03, a filtered water pipe 04, a solenoid valve 05 and a sewage pipe 06. There are at least three four-way valves 01, which are installed above the sand filter 02. The sand filter 02 is filled with quartz sand. This is the prior art and its principle is not repeated here. The number of sand filters 02 corresponds to the number of four-way valves 01, that is, there are as many four-way valves 01 as there are sand filters 02 required to filter water. Each four-way valve 01 is provided with a water inlet 12a, a water outlet 12b, a filter port 13 and a sewage outlet 14. The water inlet 12a and the water outlet 12b of a single four-way valve 01 are normally connected through the internal valve cavity of the four-way valve. Water enters through the water inlet of the first four-way valve 01, and the water outlet of the previous four-way valve 01 is connected to the water inlet of the next four-way valve 01 through the normal water pipe 03, and the water outlet of the last four-way valve 01 is connected to the water outlet of the last four-way valve 01. The blockage is closed, and the filter port 13 of each four-way valve 01 is connected in parallel through the filter water pipe 04. The solenoid valve 05 is installed at the end of the filter water pipe 04. The sewage outlet 14 of each four-way valve 01 is connected in parallel to the sewage pipe 06. When all sand filters are filtering normally, water enters the sand filter 02 through the four-way valve for filtration and is discharged to the filter water pipe 04. The solenoid valve 05 opens the outlet of the filter water pipe 04, and the filtered purified water is discharged from the filter water pipe 04. When one of the sand filters 02 is backwashed and cleaned, and the other sand filters are filtering normally, the four-way valve 01 corresponding to the backwashing and cleaning sand filter switches the internal pipeline, and the solenoid valve 05 closes the filter water pipe 04. The water discharged from the filter port 13 of the other four-way valves 01 reaches the filter water pipe 04, and then flows into the filter port 13 of the four-way valve 01 corresponding to the backwashing and cleaning sand filter through the filter water pipe 04. After the water is pressurized to clean the sand filter, it is discharged through the sewage outlet 14 to the sewage pipe 06.

[0037] Implementation method 1 of water treatment and filtration system: The water treatment and filtration system has three four-way valves 01 and three sand filters 02. The water outlet 12b of the first four-way valve 01 is connected to the water inlet 12a of the second four-way valve 01 through the normal water pipe 03. The water outlet 12b of the second four-way valve 01 is connected to the water inlet 12a of the third four-way valve 01 through the normal water pipe 03. The water outlet 12b of the third four-way valve 01 is blocked and closed. The filter ports of the three four-way valves 01 are connected in parallel through the filter pipe 04. The sewage outlets 14 of the three four-way valves 01 are connected in parallel to the sewage pipe 06. When the three sand filters 02 are filtering normally, water enters through the water inlet 12a of the first four-way valve 01 and then reaches the three four-way valves 01 and enters the filtration inner layers of the three sand filters 02. The three sand filters 02 filter the water and discharge it into the filter water pipe 04. The solenoid valve 05 opens the outlet of the filter water pipe 04, and the filtered purified water is discharged from the filter water pipe 04. When the first sand filter 02 is backwashed and cleaned, the first four-way valve 01 switches the internal pipeline, the solenoid valve 05 closes the filter water pipe 04, the second four-way valve 01 and the second four-way valve 01 do not move, and the water discharged from the filter port 13 of the second sand filter 02 and the third sand filter 02 reaches the filter water pipe 04, and then flows into the filter port 13 of the first four-way valve 01 through the filter water pipe 04. The water from the two places converges and boosts the pressure to clean the first sand filter, and then is discharged through the sewage outlet 14 to the sewage pipe 06. Similarly, the principle of backwashing the second sand filter 02 or the third sand filter 02 is similar and will not be repeated.

[0038] Implementation method 2 of water treatment and filtration system: There are 4 four-way valves 01 and sand filters 02 in the water treatment and filtration system. Water enters through the water inlet of the first four-way valve 01, and the water outlet 12b of the first four-way valve 01 is connected to the water inlet 12a of the second four-way valve 01 through a normal water pipe. The water outlet 12b of the second four-way valve 01 is connected to the water inlet 12a of the third four-way valve 01 through a normal water pipe 03. The water outlet of the third four-way valve 01 is connected to the water inlet 12a of the fourth four-way valve 01 through a normal water pipe 03. The water outlet 12b of the fourth four-way valve 01 is blocked and closed. The filter ports 13 of the four four-way valves 01 are connected in parallel to the filter pipe 04, and the sewage outlets 14 of the four four-way valves 01 are connected in parallel to the sewage pipe 06. When the four sand filters 02 are filtering normally, water enters through the water inlet 12a of the first four-way valve 01 and then reaches the four four-way valves 01 and enters the four The filtering inner layer of the sand filter 02, the filtered water of the four sand filters 02 is discharged to the filter water pipe 04, the solenoid valve 05 opens the outlet of the filter water pipe 04, and the filtered purified water is discharged from the filter water pipe 04. When the first sand filter 02 is backwashed and cleaned, the first four-way valve 01 switches the internal pipeline, the solenoid valve 05 closes the filter water pipe 04, the second four-way valve 01, the second four-way valve 01, and the fourth four-way valve 01 do not move, and the water discharged from the filter port 13 of the second sand filter 02, the third sand filter 02, and the fourth sand filter 02 reaches the filter water pipe 04, and then flows into the filter port 13 of the first four-way valve 01 through the filter water pipe 04. The water from three places converges and boosts the pressure to clean the first sand filter and is discharged through the sewage outlet 14 to the sewage pipe 06. Similarly, the principle of backwashing the second sand filter 02 or the third sand filter 02 or the fourth sand filter 02 is similar and will not be repeated.

[0039] like Figures 4-12 As shown, a four-way valve for the above-mentioned water treatment and filtration system includes a valve body 1, a motor 2, a transmission mechanism 3, a valve stem 4 and a valve core 5. A valve cavity 11 is provided inside the valve body 1, and a water inlet 12a and a water outlet 12b are provided on the upper outer part of the valve body 1. The water inlet 12a is normally connected with the water outlet 12b through the valve cavity 11. The motor 2 drives the valve core 5 to rotate through the transmission mechanism 3. The valve core 5 is installed in the lower part of the valve cavity 11. A filter port 13 and a sewage outlet 14 are provided on the lower outer part of the valve body 1. An arc valve port 15 and a central valve port 16 for loading into the sand filter 02 are provided below the valve body 1. There are two arc valve ports 15, which are arranged around the central valve port 16. The central valve port 16 is connected to the filter port 13. The filtration and backwashing of the sand filter 02 are based on the existing technology.

[0040] like Figures 7-9As shown, when the sand filter 02 is filtering normally, the valve cavity 11 is connected to the arc valve port through the valve core, and water is discharged in sequence through the water inlet 12a, valve cavity 11, valve core 5, arc valve port 15, sand filter 0202, central valve port 16, and filter port 13. At this time, the discharged water is purified water after filtration. Figures 10-12 As shown, when the sand filter 02 is backwashed and cleaned, the valve core 5 rotates to make the valve cavity 11 and the arc valve port 15 non-conductive; and the arc valve port 15 is connected to the sewage outlet 14 through the valve core 5, and the water is discharged in sequence through the filter port 13, the central valve port 16, the sand filter 0202, the arc valve port 15, the valve core 5, and the sewage outlet 14. At this time, the discharged water is the sewage after backwashing (in Figures 7-12 The direction of the arrow is the direction of water flow).

[0041] like Figures 13-16As shown, the valve core 5 includes an upper valve disc 51, a middle valve disc 52 and a lower valve disc 53. The upper valve disc 51, the middle valve disc 52 and the lower valve disc 53 are circular in shape. The upper valve disc 51 and the lower valve disc 53 are fixedly installed in the valve cavity 11. The middle valve disc 52 is located between the upper valve disc 51 and the lower valve disc 53. The valve stem 4 drives the middle valve disc 52 to rotate to switch the channel. The upper valve disc 51 is provided with an upper closed port 51a and an upper opening 51b. There are 3 upper closed ports 51a and 1 upper opening 51b. The upper closed ports 51a and the upper opening 51b are arc-shaped with the same shape. The upper closed ports 51a and the upper opening 51b surround The upper valve disc 51 is arranged circumferentially along the central axis, and the upper closed opening 51a and the upper opening 51b correspond to their respective central angles of 90 degrees. The middle valve disc 52 is provided with a middle closed opening 52a and a middle opening 52b. There is one middle closed opening 52a and one middle opening 52b. The middle closed opening 52a and the middle opening 52b are arc-shaped with the same shape. The middle closed opening 52a and the middle opening 52b are arranged circumferentially around the central axis of the middle valve disc. A spacer 52c is provided in the middle of the middle closed opening 52a. The spacer 52c divides the middle closed opening 52a into two. The middle closed opening 52a and the middle opening 52b correspond to their respective central angles of 180 degrees. The lower valve disc 5 3 is provided with a lower closed port 53a and a lower opening 53b, there is one lower closed port 53a and three lower openings 53b, the lower closed port 53a and the lower opening 53b are of the same arc shape, the lower closed port 53a and the lower opening 53b are arranged circumferentially around the central axis of the upper valve plate, and the central angles of the lower closed port 53a and the lower opening 53b are 180 degrees. When the sand filter 02 is filtering normally, the upper opening 51b, the middle opening 52b and the lower opening 53b are aligned, the valve cavity 11 is connected to one of the arc valve ports 15 through the valve core 5, and water enters the sand filter 02, is filtered and purified, and then flows to the central valve port 1 6. Since the lower closed port 53a blocks the channel above the central valve port 16, the purified water is directly discharged from the filter port 13 at this time. When the sand filter 02 is backwashed and cleaned, the valve stem 4 drives the middle valve disc 53 to rotate 180 degrees. The upper opening 51b, the middle closed port 52a, and the lower opening 53b are aligned with one arc-shaped valve port 15, which is blocked to prevent water from entering the valve chamber 11. At the same time, the upper closed port 51a, the middle opening 52b, and the lower opening 53a on the other side are aligned, and the other arc-shaped valve port 15 is connected to the sewage outlet 14 through the valve core 5. The sewage enters the middle opening 52b and is guided to the sewage outlet 14 for discharge. The design is ingenious.

[0042] Specifically, a circular hole 52d is provided at the center of the middle valve disc 52, and the front and rear sides of the circular hole 52d are connected to the groove 52e. A step 41 is provided at the bottom of the valve stem 4. When the valve stem 4 is inserted into the circular hole 52d, the step 41 is embedded in the groove 52e to ensure that the middle valve disc 52 rotates synchronously with the valve stem 4.

[0043] like Figure 17As shown, positioning grooves 54 are provided on the outside of the upper valve disc 51 and the lower valve disc 53, and positioning strips 17 that cooperate with the positioning grooves 54 are provided in the valve cavity 11. Preferably, there are 4 positioning grooves 54 and 4 positioning strips 17 respectively. The positioning grooves 54 cooperate with the positioning strips 17 to prevent the upper valve disc 51 and the lower valve disc 53 from rotating out of position, and a sealing ring 6 is installed in the valve cavity 11. The sealing ring 6 is located at the bottom of the lower valve disc 53 to play a sealing role. In addition, a motor fixing shell 7 is installed above the valve body 1, and a motor 2 is installed at the bottom of the motor fixing shell 7. The motor 2 is installed in the motor cavity 18 of the valve body 1. The transmission mechanism 3 includes a pinion and a gear. The pinion is installed on the motor output shaft. The pinion engages the gear. The gear is installed at the top of the valve stem 4. The motor 2 drives the pinion to rotate, the pinion drives the gear to rotate, the gear drives the valve stem 4 to rotate, and the valve stem 4 drives the middle valve disc 52 to rotate.

[0044] Specifically, the lower part of the valve body 1 is provided with an external thread that is convenient for installation on the sand filter 02. By rotating the entire valve body 1, the external thread is locked to the internal thread of the sand filter 02, thereby realizing quick installation of the four-way valve. In addition, the water inlet 12a, the water outlet 12b, the filter port 13, and the sewage outlet 14 are respectively provided with internal threads that are convenient for connecting to external pipes, thereby facilitating the assembly of pipelines.

[0045] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or replacements can be made without departing from the concept of the present invention, which should be regarded as falling within the scope of protection of the present invention.

Claims

1. A four-way valve for a water treatment and filtration system, characterized by: It includes a valve body, a motor, a transmission mechanism, a valve stem and a valve core. The lower part of the valve body is provided with an external thread for easy installation in a sand filter. A valve cavity is provided inside the valve body. A water inlet and a water outlet are provided on the upper part of the outer side of the valve body. The water inlet is normally connected through the valve cavity and the water outlet. The motor drives the valve core to rotate through the transmission mechanism. The valve core is installed in the lower part of the valve cavity. A filter port and a sewage outlet are provided on the lower part of the outer side of the valve body. An arc valve port and a central valve port for loading into the sand filter are provided below the valve body. The central valve port is connected to the filter port. When the sand filter is filtering normally, the valve cavity passes through The valve core is connected to the arc-shaped valve port, and water is discharged through the water inlet, valve cavity, valve core, arc-shaped valve port, sand filter, center valve port, and filter port in sequence. Water enters the sand filter through the water inlet of the four-way valve and is filtered, and then discharged from the filter port to the filter water pipe. At this time, the discharged water is purified water after filtration. When the sand filter is backwashed and cleaned, the valve core rotates to make the valve cavity and the arc-shaped valve port unconnected; and the arc-shaped valve port is connected to the sewage outlet through the valve core, and water is discharged through the filter port, center valve port, sand filter, arc-shaped valve port, valve core, and sewage outlet in sequence. At this time, the discharged water is sewage after backwashing.

2. A four-way valve for a water treatment and filtration system according to claim 1, characterized in that: The valve core includes an upper valve disc, a middle valve disc and a lower valve disc. The upper valve disc and the lower valve disc are fixedly installed in the valve cavity. The middle valve disc is located between the upper valve disc and the lower valve disc. The valve stem drives the middle valve disc to rotate. The upper valve disc is provided with an upper closed port and an upper open port, the middle valve disc is provided with a middle closed port and a middle open port, and the lower valve disc is provided with a lower closed port and a lower opening. When the sand filter is filtering normally, the upper opening, the middle opening and the lower opening are aligned, and the valve cavity is connected to the arc valve port through the valve core. When the sand filter is backwashed and cleaned, the valve stem drives the middle valve disc to rotate 180 degrees, the upper closed port, the middle opening and the lower opening are aligned, and the arc valve port is connected to the sewage outlet through the valve core.

3. A four-way valve for a water treatment and filtration system according to claim 2, characterized in that: There are three upper closed openings and one upper opening, the upper closed opening and the upper opening are arc-shaped with the same shape, and are arranged circumferentially around the central axis of the upper valve disc. There is one middle closed opening and one middle opening, the middle closed opening and the middle opening are arc-shaped with the same shape, and are arranged circumferentially around the central axis of the middle valve disc. A partition bar is provided in the middle of the middle closed opening, which divides the middle closed opening into two. There is one lower closed opening and three lower openings, the lower closed opening and the lower opening are arc-shaped with the same shape, and are arranged circumferentially around the central axis of the upper valve disc.

4. A four-way valve for a water treatment and filtration system according to claim 2, characterized in that: A circular hole is provided at the center of the middle valve plate, the front and rear sides of the circular hole are connected to the groove, and a step is provided at the bottom of the valve stem. When the valve stem is inserted into the circular hole, the step is embedded in the groove.

5. The four-way valve for a water treatment and filtration system according to claim 1, characterized in that: A motor fixing shell is installed above the valve body, a motor is installed at the bottom of the motor fixing shell, and the motor is installed in the motor cavity of the valve body. The transmission mechanism includes a small gear and a large gear. The small gear is installed on the motor output shaft, the small gear meshes with the large gear, and the large gear is installed on the top of the valve stem.

6. A four-way valve for a water treatment and filtration system according to claim 1, characterized in that: A motor fixing shell is installed above the valve body, a motor is installed at the bottom of the motor fixing shell, and the motor is installed in the motor cavity of the valve body. The transmission mechanism includes a small gear and a large gear. The small gear is installed on the motor output shaft, the small gear meshes with the large gear, and the large gear is installed on the top of the valve stem.

7. A water treatment and filtration system, characterized in that: It includes the four-way valve, sand filter, normal water pipe, filtered water pipe, solenoid valve and sewage pipe described in any one of claims 1 to 6, there are at least 3 four-way valves, the four-way valves are installed above the sand filter, the number of sand filters corresponds to the number of four-way valves, each four-way valve is provided with a water inlet, a water outlet, a filter port and a sewage outlet, the water inlet and the water outlet of a single four-way valve are normally connected through the valve cavity inside the four-way valve, water enters through the water inlet of the first four-way valve, the water outlet of the previous four-way valve is connected to the water inlet of the next four-way valve through the normal water pipe, the water outlet of the last four-way valve is blocked and closed, the filter port of each four-way valve is connected in parallel to the filter pipe, a solenoid valve is installed at the end of the filtered water pipe, and the sewage outlet of each four-way valve is connected in parallel to the sewage pipe. When all sand filters are filtering normally, water enters the sand filter through the water inlet of the four-way valve and is filtered and then discharged from the filter port to the filter water pipe. When the solenoid valve is opened, the purified water after filtration is discharged from the filter water pipe. When one of the sand filters is backwashed and cleaned and the other sand filters are filtering normally, the four-way valve corresponding to the backwashing sand filter switches the internal pipeline, the solenoid valve closes the filter water pipe, and the water discharged from the filter port of the other four-way valves flows into the filter port of the four-way valve corresponding to the backwashing sand filter through the filter water pipe. After the water boosts the sand filter, it is discharged through the sewage outlet to the sewage pipe.

8. A water treatment and filtration system according to claim 7, characterized in that: There are three four-way valves and three sand filters respectively. Water enters through the water inlet of the first four-way valve. The water outlet of the first four-way valve is connected to the water inlet of the second four-way valve through a normal water pipe. The water outlet of the second four-way valve is connected to the water inlet of the third four-way valve through a normal water pipe. The water outlet of the third four-way valve is blocked and closed. The filter ports of the three four-way valves are connected in parallel to the filter pipe, and the sewage outlets of the three four-way valves are connected in parallel to the sewage pipe.

9. The water treatment and filtration system according to claim 7, characterized in that: There are four four-way valves and four sand filters respectively. Water enters through the water inlet of the first four-way valve. The water outlet of the first four-way valve is connected to the water inlet of the second four-way valve through a normal water pipe. The water outlet of the second four-way valve is connected to the water inlet of the third four-way valve through a normal water pipe. The water outlet of the third four-way valve is connected to the water inlet of the fourth four-way valve through a normal water pipe. The water outlet of the fourth four-way valve is blocked and closed. The filter ports of the four four-way valves are connected in parallel to the filter pipe, and the sewage outlets of the four four-way valves are connected in parallel to the sewage pipe.

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