Double-side water inlet and outlet independent salt path control valve and operation method thereof

Abstract

The invention discloses a double-side water inlet and outlet independent salt path control valve and an operation method thereof.The double-side water inlet and outlet independent salt path control valve comprises a control valve body, a control valve flow channel switching assembly and a salt path switching assembly, and a grating inner cavity communicating with a softening tank is formed in the control valve body; the water inlet channel and the water outlet channel are both communicated with the grille inner cavity and located in the same straight line direction, the siphon installation channel is communicated with the grille inner cavity, the siphon installation channel is communicated with the salt suction channel through a salt valve assembly installation channel, a pulse booster pump is arranged on the water inlet channel, and the pulse pump is started during back washing and front washing. Based on the cooperative arrangement of the control valve body, the control valve flow channel switching assembly and the salt path switching assembly, the control valve can be conveniently operated, and the working states of purification, backwashing, salt absorption or water supplement of the softening machine can be flexibly switched; and the pulse pump is started during backwashing and conventional washing, so that the pressure of the water inlet is increased, the backwashing and conventional washing time is shortened, the backwashing and conventional washing effects are enhanced, and wastewater discharge is reduced.

Description

Technical Field

[0001] The invention belongs to the field of water softeners, and in particular relates to a double-side water inlet and outlet independent salt circuit control valve and an operation method thereof. Background Art

[0002] A water softener is a device that removes calcium and magnesium ions from water through ion exchange resin to reduce the hardness of water. A water softener has a softening effect on water quality, can remove calcium and magnesium ions from water, make the water quality softer, and has a good improvement effect on daily water use such as washing, bathing, and shampooing. At the same time, a water softener can also be used in the industrial field, such as boilers, air conditioners and other equipment that require the use of soft water. A water softener is an efficient and environmentally friendly device that can improve the quality of domestic water, and is also one of the indispensable equipment in the industrial field.

[0003] The purified water of the water softener is hard water that enters the resin tank through the control valve, and the water treated by the exchange agent passes through the bottom separator, flows upward through the lift pipe, and then flows out through the control valve. The backwash of the water softener is hard water that enters the control valve, flows from the center lift pipe from top to bottom to the bottom diverter, backwashes the exchange agent from bottom to top, and is discharged through the control valve drain port. The regeneration of the water softener is that after the hard water enters the control valve, it enters the water injector from the top, and then absorbs the reducing agent in the salt tank through the jet process. The water with the reducing agent flows downward through the exchange agent layer into the diverter and lift pipe, and then is discharged through the control valve drain port.

[0004] The core component of a water softener is a control valve. The functions of a control valve include switching between different water paths such as water purification, backwashing, salt absorption and regeneration, forward washing and water injection. Based on this, a new type of control valve is designed, which can be easily operated and flexibly switch the working state of the softener's purification, backwashing, salt absorption or water replenishment. Summary of the invention

[0005] Purpose of the invention: The technical problem to be solved by the present invention is to provide a new type of control valve, which can not only realize the convenient installation of the softening machine, but also can flexibly switch the working state of the softening machine among purification, backwashing, salt absorption or water replenishment.

[0006] Technical solution: The double-side water inlet and outlet independent salt circuit control valve of the present invention comprises:

[0007] The control valve body is connected to the softening tank, and is provided with a grille inner cavity communicating with the softening tank, a water inlet channel and a water outlet channel both communicating with the grille inner cavity and located in the same straight line direction, and a siphon installation channel communicating with the grille inner cavity, wherein the siphon installation channel is connected with the salt absorption channel through the salt valve assembly installation channel;

[0008] A control valve flow channel switching assembly, which includes a grid assembly integrated in the inner cavity of the grid, and a segmented piston assembly that is matched with the grid assembly and moves in the grid assembly to realize the switching of different control valve channels;

[0009] A salt path switching component is integrated into the installation channel of the salt valve component to realize the opening and closing of the siphon installation channel and the salt absorption channel, and to switch the salt path channel on and off; the salt path switching component includes a hollow bracket and a fixed rod sleeved on the bracket, and the side wall of the bracket is provided with a plurality of salt path channels connected with the interior thereof, and a soft seat is provided on the end of the fixed rod to form an internal seal with the fixed rod, and the soft seat forms a compression seal with the contact end of the bracket.

[0010] Furthermore, a drainage channel communicating with the inner cavity of the grille is provided on the control valve body of the control valve on the same side of the water outlet channel.

[0011] Furthermore, a pulse booster pump is connected to the water inlet channel of the control valve.

[0012] Furthermore, the control valve flow channel switching assembly of the control valve also includes a gear drive assembly that drives the segmented piston assembly to rotate, and the segmented piston assembly includes a piston body with a plurality of bosses, a helical worm connected to the piston body at one end and fixedly connected to the gear drive assembly at the other end, and connecting screws that connect and fix the helical worm to the piston body.

[0013] Furthermore, the gear drive assembly of the control valve includes a drive motor with active teeth and driven teeth meshing with the active teeth. The helical worm of the segmented piston assembly is rotatably sleeved on the driven teeth, and the rotation of the driven teeth drives the linear motion of the helical worm.

[0014] Furthermore, the gear drive assembly and the segmented piston assembly of the control valve are integrated on a baffle plate connected to the control valve body. The baffle plate also includes a signal acquisition device for detecting the movement of the segmented piston assembly to the original position and a main gear rotation number detection assembly to determine the stop position of the segmented piston assembly by the number of rotations of the active gear.

[0015] Furthermore, the spiral worm of the control valve is connected with a shaft sleeve, through which the rotational connection with the driving tooth is realized; and the inner side of the driven tooth is provided with a thread matching the spiral worm.

[0016] Furthermore, there is a gap for the salt path channel between the bracket of the salt path switching assembly of the control valve and the fixing rod sleeved on the bracket, and the salt path channel is switched on and off by the cooperation between the ends of the soft seat and the bracket.

[0017] Furthermore, the salt circuit switching assembly of the control valve also includes a top cover which is mounted on the fixed rod and located at the other end of the bracket, and a motor which is arranged at the other end of the fixed rod to drive the fixed rod to move forward and backward; an elastic element is mounted on the top cover, and one end of the elastic element is connected to the top cover, and the other end is limited by a retaining spring mounted on the fixed rod.

[0018] The operating method of the above-mentioned double-side independent salt circuit control valve for water inlet and outlet of the present invention comprises the following steps:

[0019] (1) Rotate the segmented piston assembly to connect the grid assembly, the water inlet end of the softening tank, and the water inlet channel, connect the grid assembly, the water outlet end of the softening tank, and the water outlet channel, and block the drainage channel and the grid assembly to perform water purification work of the control valve;

[0020] (2) Rotate the segmented piston assembly to connect the grid assembly, the water outlet of the softening tank, and the water inlet channel, connect the grid assembly, the water inlet of the softening tank, and the drainage channel, and block the water outlet channel and the grid assembly to perform backwashing of the control valve;

[0021] (3) Press the fixing rod of the salt path switching assembly to disengage the soft seat from the bracket, and rotate the segmented piston assembly to form a connection between the salt absorption channel, the salt valve assembly installation channel, the siphon installation channel, the grille assembly and the water inlet end of the softening tank, thereby forming a barrier between the water inlet channel and the grille assembly, a barrier between the water outlet channel and the grille assembly, and a barrier between the drainage channel and the grille assembly, thereby realizing the control valve's salt absorption or water replenishment work for the softening tank.

[0022] Beneficial effect: Compared with the prior art, the significant advantage of the present invention is that the control valve is based on the coordinated setting of the control valve body, the control valve flow channel switching component and the salt path switching component, which can conveniently operate the control valve and flexibly switch the working state of the softener such as purification, backwashing, salt absorption or water replenishment.

[0023] Among them, the control valve places the water inlet channel and the water outlet channel on the same straight line, which facilitates the connection of pipelines during actual application; an independent salt circuit switching component is set up, which is closed under normal conditions to close the salt circuit channel; an integrated grille component, that is, the grille is formed into a whole, which is easy to disassemble and maintain.

[0024] In addition, through the cooperation of the boss of the segmented piston assembly and the grid assembly, the gear drive assembly drives the movement of the segmented piston assembly to realize different flow channels between the segmented piston assembly and the grid assembly, and then correspond to the flow channel on the control valve to realize the switching of the flow channel on the control valve. The salt path switching assembly can realize the opening and closing of the salt path through the forward and backward movement of the fixed rod, which improves the convenience of application; wherein, the salt path switching assembly is set by the cooperation of the soft seat, the fixed rod and the bracket, that is, the forward and backward movement of the fixed rod realizes the connection or disconnection of the soft seat with the bracket, and then realizes the disconnection or opening state of the salt path by the assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A three-dimensional diagram of the control valve of the present invention being assembled on a soft water tank;

[0026] Figure 2 It is a structural schematic diagram of the control valve body of the present invention;

[0027] Figure 3 It is a structural schematic diagram of a flow channel switching assembly of a control valve of the present invention;

[0028] Figure 4 It is a structural schematic diagram of the grille assembly of the present invention;

[0029] Figure 5 It is a structural schematic diagram of the segmented piston assembly of the present invention;

[0030] Figure 6 It is a structural diagram of the connecting screws and the spiral worm of the segmented piston assembly of the present invention;

[0031] Figure 7 is a line drawing of the salt path switching assembly of the present invention;

[0032] Figure 8 An exploded view of the salt road switching assembly of the present invention;

[0033] Fig. 9 It is a schematic diagram of the internal structure of the control valve of the present invention;

[0034] Fig.10 A schematic diagram of the water path of the control valve in the water purification state of the present invention;

[0035] Fig.11 This is a schematic diagram of the water path of the control valve in the backwash state of the present invention. DETAILED DESCRIPTION

[0036] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0037] The control valve of the present invention is matched with the softening tank 1 to realize the working state of purification, backwashing, salt absorption or water replenishment of the softening machine. The control valve adopts double-side water inlet and outlet and independent salt circuit control, which improves the convenience of use and production cost of the control valve. Specifically, Figure 1 As shown, the control valve includes a control valve body connected to the softening tank 1, a control valve flow path switching component arranged in the control valve body, and a salt path switching component arranged in the control valve body. Through the cooperation of the three, the working states of the softener such as purification, backwashing, salt absorption or water replenishment can be flexibly switched.

[0038] Among them, Figure 2 As shown, the bottom end of the control valve body is set to be threaded and threadedly connected to the softening tank 1. A grid cavity 2 is provided on it, which is connected to the softening tank 1. The grid cavity 2 is used to integrate the control valve flow channel switching component. The control valve body is provided with an inlet channel 3 and an outlet channel 4, which are both connected to the grid cavity 2 and located in the same straight line; the inlet channel 3 is connected to a pulse booster pump 37, so that the pulse booster pump is started during forward washing and backwashing to increase the water pressure. The increased water pressure enhances the forward washing and backwashing effects, shortens the forward washing and backwashing time, and reduces the water consumption of the softening valve. The control valve body is also provided with a siphon installation channel 5 connected to the grid cavity 2, which is used to integrate a siphon. The siphon is a well-known technology in the art, and the siphon effect will be used to absorb salt or replenish water in the softening tank 1. Salt or water is absorbed through the salt absorption channel 7, and the salt absorption channel 7 is connected or disconnected with the siphon installation channel 5 through the salt valve assembly installation channel 6, and the salt path switching component is integrated in the salt valve assembly installation channel 6. The control valve body is also provided with a drainage channel 13 connected to the grille cavity 2, and the drainage channel 13 can be located on the same side as the water outlet channel 3.

[0039] like Figures 3 to 6 As shown, the control valve flow channel switching assembly of the present invention includes a grille assembly 8, a segmented piston assembly 9 and a gear drive assembly 14. The segmented piston assembly 9 is provided with a plurality of bosses, preferably three, and the grille assembly 8 is provided with a plurality of water-passing brackets 31, preferably four. The segmented piston assembly 9 moves in the grille assembly 8, and the plurality of bosses on the segmented piston assembly 9 cooperate with the plurality of water-passing brackets 31 of the grille assembly 8, so that the segmented piston assembly 9 moves in the grille assembly 8 to realize the switching of different passages between the grille assembly 8 and the segmented piston assembly 9, and then when the switching assembly is applied to the control valve, the switching of different water channels on the control valve is realized.

[0040] The grille assembly 8 includes an internal water-passing bracket 29, a water-passing bracket 31 connected to the internal water-passing bracket 29 in sequence, and an end cover 30 provided at the other end of the water-passing bracket 31. That is, the grille assembly 8 includes the internal water-passing bracket 29 and the end cover 30, and a plurality of water-passing brackets 31 provided between the internal water-passing bracket 29 and the end cover 30.

[0041] The segmented piston assembly 9 includes a piston body 15 with a plurality of bosses, and a spiral worm 16 connected to the piston body 15 by a connecting screw 17. The gear drive assembly 14 includes a driving motor 19, on which a driving tooth 18 is provided, and a driven tooth 20 connected to the spiral worm 16, and the driven tooth 20 meshes with the driving tooth 18. The spiral worm 16 is connected to the driven tooth 20 by a sleeve 24, and the sleeve 20 is fixed on the spiral worm 16 by a latch 32, and the inner side of the driven tooth 20 is provided with a thread matching the spiral worm 16. That is, the switching assembly of the present invention drives the driving tooth 18 to rotate through the driving motor 19, and then drives the driven tooth 20 to rotate, and the driven tooth 20 is connected to the spiral worm 16 by a threaded connection, so as to realize the linear motion of the spiral worm 16, and then realize the piston body 15 with a boss of the segmented piston assembly 9 to move in the grid assembly 8, so as to realize the connection or closure of different passages.

[0042] like Figures 7 and 8As shown, the salt path switching assembly of the present invention is integrated into the salt valve assembly installation channel 6 of the water softener control valve, so that it is closed in the normal state and the salt path channel is closed; the salt path switching assembly is operated to open the salt path channel in the corresponding control valve only when salt absorption or water replenishment is required. The salt path switching assembly includes a fixed rod 11, and one end of the fixed rod 11 (which can be understood as the front end) is connected to a soft seat 12 to form an internal sealing connection with the front end of the fixed rod 11. The other end of the fixed rod 11 (which can be understood as the tail end) is connected to a motor 26 to drive the fixed rod 11 to move forward and backward through the motor 26. Specifically, a bracket 10 is sleeved at the end of the fixed rod 11 near the soft seat 12. The bracket 10 is a hollow bracket, and the side wall of the bracket 10 is provided with a plurality of salt path channels connected to the interior thereof. There is also a gap of the salt passage between the fixed rod 11 and the bracket 10, which can be realized when salt absorption or water replenishment is needed, it can enter from the side wall of the bracket 10, circulate inside it, and then flow out from the end of the bracket 10 close to the soft seat 12, and then the salt passage on the corresponding control valve is opened. The opening and closing of the salt passages of the bracket 10 and the fixed rod 11 are realized by the soft seat 12, that is, the soft seat 12 is arranged between the front end of the fixed rod 11 and the front end of the bracket 10, and the soft seat 12 is sleeved on the fixed rod 11, which is a hemispherical structure with a through hole, and the long diameter end is fixedly connected to the fixed rod 11 to realize the internal sealing connection, and the end of the fixed rod 11 is extended with a side edge that forms an internal sealing connection with the soft seat 12. The short diameter end of the soft seat 12 is movably connected to the front end of the bracket 10 to realize the compression seal between the soft seat and the bracket 10. The rear end of the bracket 10 is connected with a top cover 25. Similarly, the top cover 25 is sleeved on the fixed rod 11. The top cover 25 is connected with an elastic element 27, preferably a spring, and the other end of the spring is limited by a retaining spring 28 sleeved on the fixed rod 11. A support sheet 33 is also provided between the top cover 25 and the retaining spring 28, which is equivalent to limiting the forward and backward movement of the fixed rod 11. That is, the fixed rod 11 of the salt road closing assembly of the present invention can slide forward and backward in the bracket 10 and the top cover 25, and the fixed rod 11 and the soft seat 12 are fixedly connected as a whole. When the motor 26 drives the fixed rod 11 to move forward, the soft seat 12 and the fixed rod 11 will be separated from the bracket, and then there is a flow channel between the soft seat 12 and the bracket 10, so as to realize the open state of the salt road channel for salt absorption or water replenishment; when the motor 26 drives the fixed rod 11 to move backward, that is, the fixed rod 11 shrinks, and a compression seal connection is formed between the soft seat 12 and the bracket 10, so as to realize the closed state of the salt road channel. In addition to the above, in order to further improve the sealing performance between the salt road closing assembly and the salt road channel of the control valve and the sealing performance between various components, a sealing ring 36 is also provided between the bracket 10 and the top cover 25, and a sealing ring 36 is also provided at the other end of the bracket 10.

[0043] In addition to the above, the control valve flow channel switching assembly and the salt path switching assembly of the present invention are respectively integrated into the grid cavity 2 and the salt valve assembly installation channel 6, and also require a baffle assembly for connection and fixation. That is, the baffle assembly is used to fix the two on the one hand, and on the other hand, the baffle assembly is integrated into the control valve body, thereby improving the convenience of installation and disassembly. Specifically, the drive motor 19 of the gear drive assembly 14 of the control valve flow channel switching assembly, the segmented piston assembly 9, and the motor 26 of the salt path switching assembly can be directly integrated into the baffle assembly, and the baffle assembly may include a baffle 21 and a baffle cover for accommodating the above components. In addition, a signal acquisition bracket 34 and a PCBA control board 35 may also be provided on the baffle 21, such as Fig. 9 As shown, the signal acquisition bracket 34 can be provided with a signal acquisition device 22 for detecting the movement of the segmented piston assembly 9 to the original position, that is, the segmented piston zero detection assembly, which can be a sensor known in the art; and a monitoring assembly 23 for detecting the number of rotations of the main gear 18, which can also be a sensor known in the art, so as to determine the stop position of the segmented piston assembly 9 by the number of rotations of the active gear 18. That is, the segmented piston zero detection assembly detects that the segmented piston assembly 9 moves to the original position, and feeds back to the PCBA control board 35, and the PCBA control board 35 forms an electrical connection with the drive motor 19, which can control the start and stop of the drive motor 19. The monitoring assembly 23 detects the number of rotations of the active gear according to the active gear, and when the set number of rotations is reached, it feeds back to the PCBA control board 35, thereby controlling the start and stop of the drive motor 19. As described above, the present invention realizes the position of the segmented piston assembly 9 in the grid assembly 8 by adopting a control system, thereby realizing the on-off state of different channels according to different functional requirements.

[0044] The operating method of the above-mentioned double-side independent salt circuit control valve for water inlet and outlet of the present invention comprises the following steps:

[0045] (1) Rotate the segmented piston assembly to connect the grid assembly 8, the water inlet end of the softening tank 1, and the water inlet channel 3, connect the grid assembly 8, the water outlet end of the softening tank 1, and the water outlet channel 4, and block the drainage channel 13 from the grid assembly 8 to perform water purification work of the control valve, such as Fig.10 As shown;

[0046] (2) Rotate the segmented piston assembly 9 to connect the grid assembly 8, the water outlet of the softening tank 1, and the water inlet channel 3, connect the grid assembly 8, the water inlet of the softening tank 1, and the drainage channel 13, and block the water outlet channel 4 and the grid assembly 8 to perform backwashing of the control valve. Fig.11 As shown;

[0047] (3) Press the fixing rod 11 of the salt path switching assembly to disengage the soft seat 12 from the bracket 10, and rotate the segmented piston assembly 9 to form a connection between the salt absorption channel 7, the salt valve assembly installation channel 6, the siphon installation channel 5, the internal water-passing bracket 29 of the grille assembly 8 and the water inlet end of the softening tank 1, thereby forming a barrier between the water inlet channel 3 and the grille assembly 8, a barrier between the water outlet channel 4 and the grille assembly 8, and a barrier between the drainage channel 13 and the grille assembly 8, so as to realize the control valve to absorb salt or replenish water for the softening tank 1.

Claims

1. A double-side independent salt circuit control valve for water inlet and outlet, characterized in that: The control valve includes: A control valve body is connected to the softening tank (1), and is provided with a grille inner cavity (2) communicating with the softening tank (1), a water inlet channel (3) and a water outlet channel (4) both communicating with the grille inner cavity (2) and located in the same straight line direction, and a siphon installation channel (5) arranged in communication with the grille inner cavity (2), wherein the siphon installation channel (5) is in communication with the salt absorption channel (7) via a salt valve assembly installation channel (6); A control valve flow channel switching assembly, comprising a grid assembly (8) integrated in a grid inner cavity (2), and a segmented piston assembly (9) matched with the grid assembly (8) and moving in the grid assembly (8) to realize the switching of different control valve channels; A salt path switching component is integrated into a salt valve component installation channel (6) to realize the on-off switching of a siphon installation channel (5) and a salt absorption channel (7), and to switch the salt path channel on and off; the salt path switching component comprises a hollow bracket (10) and a fixing rod (11) sleeved on the bracket (10), the side wall of the bracket (10) is provided with a plurality of salt path channels connected to the interior thereof, a soft seat (12) is provided on the end of the fixing rod (11) to form an internal seal with the fixing rod (11), and the soft seat (12) forms a compression seal with the contact end of the bracket (10).

2. The double-side independent salt circuit control valve for water inlet and outlet according to claim 1 is characterized in that: A drainage channel (13) communicating with the grille inner cavity (2) is also provided on the control valve body on the same side as the water outlet channel (4).

3. The double-side independent salt circuit control valve for water inlet and outlet according to claim 1 is characterized in that: The water inlet channel (3) is connected to a pulse booster pump (37).

4. The double-side independent salt circuit control valve for water inlet and outlet according to claim 1 is characterized in that: The control valve flow channel switching assembly also includes a gear drive assembly (14) for driving the segmented piston assembly (9) to rotate. The segmented piston assembly (9) includes a piston body (15) provided with a plurality of bosses, a helical worm (16) connected to the piston body (15) at one end and fixedly connected to the gear drive assembly (9) at the other end, and a connecting screw (17) for connecting and fixing the helical worm (16) to the piston body (15).

5. The double-side independent salt circuit control valve for water inlet and outlet according to claim 4 is characterized in that: The gear drive assembly (14) comprises a drive motor (19) provided with a driving tooth (18), and a driven tooth (20) meshing with the driving tooth (18). The helical worm (16) of the segmented piston assembly (9) is rotatably sleeved on the driven tooth (20), and the helical worm (16) is driven to move linearly by the rotation of the driven tooth (20).

6. The double-side independent salt circuit control valve for water inlet and outlet according to claim 5 is characterized in that: The gear drive assembly (14) and the segmented piston assembly (9) are integrated on a baffle (21) connected to the control valve body. The baffle (21) also includes a signal acquisition device (22) for detecting the movement of the segmented piston assembly (9) to the original position and a monitoring assembly (23) for detecting the number of rotations of the main gear (18), so as to determine the stop position of the segmented piston assembly (9) by the number of rotations of the driving gear (18).

7. The double-side independent salt circuit control valve for water inlet and outlet according to claim 4 is characterized in that: The helical worm (16) is connected with a shaft sleeve (24), and a rotation connection with the driving tooth (18) is achieved through the shaft sleeve (24); and a thread matching the helical worm (16) is provided on the inner side of the driven tooth (20).

8. The double-side independent salt circuit control valve for water inlet and outlet according to claim 1 is characterized in that: There is a salt path passage gap between the bracket (10) of the salt path switching assembly and the fixing rod (11) sleeved on the bracket (10), and the salt path passage is switched on and off by the cooperation between the ends of the soft seat (12) and the bracket (10).

9. The double-side independent salt circuit control valve for water inlet and outlet according to claim 1 is characterized in that: The salt path switching assembly further comprises a top cover (25) sleeved on the fixed rod (11) and located at the other end of the bracket (10), and a motor (26) disposed at the other end of the fixed rod (11) to drive the fixed rod (11) to move forward and backward; an elastic element (27) is sleeved on the top cover (25), and one end of the elastic element (27) is connected to the top cover (25), and the other end is limited by a retaining spring (28) sleeved on the fixed rod (11).

10. The double-side independent salt circuit control valve for water inlet and outlet according to claim 1, characterized in that: The grille assembly (1) comprises an internal water-passing bracket (29) and an end cover (30), and a plurality of water-passing brackets (31) respectively arranged between the internal water-passing bracket (29) and the end cover (30).

11. The operating method of the double-side independent salt circuit control valve for water inlet and outlet as claimed in claim 2 is characterized in that: The steps include: (1) rotating the segmented piston assembly to achieve the connection between the grid assembly (8), the water inlet end of the softening tank (1), and the water inlet channel (3), the connection between the grid assembly (8), the water outlet end of the softening tank (1), and the water outlet channel (4), and the isolation between the drainage channel (13) and the grid assembly (8), so as to perform water purification work of the control valve; (2) rotating the segmented piston assembly (9) to achieve the connection between the grid assembly (8), the water outlet end of the softening tank (1), and the water inlet channel (3), the connection between the grid assembly (8), the water inlet end of the softening tank (1), and the drainage channel (13), and the isolation of the water outlet channel (4) and the grid assembly (8), so as to perform backwashing of the control valve; (3) Press the fixing rod (11) of the salt path switching assembly to separate the soft seat (12) from the bracket (10), rotate the segmented piston assembly (9), form the communication between the salt absorption channel (7), the salt valve assembly installation channel (6), the siphon installation channel (5), the grille assembly (8) and the water inlet end of the softening tank (1), form the barrier between the water inlet channel (3) and the grille assembly (8), the barrier between the water outlet channel (4) and the grille assembly (8), and the barrier between the drainage channel (13) and the grille assembly (8), so as to realize the salt absorption or water replenishment work of the softening tank (1) by the control valve.

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