Double-cavity hydraulic control valve for backwashing control of water treatment filtering equipment

Abstract

The utility model relates to the technical field of control valves of water treatment filtering equipment, and particularly discloses a double-cavity hydraulic control valve for backwashing control of the water treatment filtering equipment, which comprises a valve body, a valve cover, a driving diaphragm, a diaphragm pressing plate, a driving cavity partition plate, a valve seat, a valve rod, a spring and a valve plate pair mechanism, a driving cavity is formed in the valve body and the valve cover, the driving diaphragm is arranged between the valve body and the valve cover, a water inlet and a water outlet which are communicated with the driving cavity are formed in the left end and the right end of the lower portion of the valve body respectively, a placing table is arranged in the valve body, and the driving cavity partition plate is arranged on the placing table in the driving cavity and located below the driving diaphragm. Diaphragm pressing plates are symmetrically arranged at the upper end and the lower end of the driving diaphragm, a sliding hole is formed in the middle of the driving cavity partition plate, the valve rod is arranged in the sliding hole in a sliding mode, an upper screw and a lower screw are arranged at the upper end and the lower end of the valve rod respectively, the upper screw extends upwards and penetrates through the driving diaphragm and the two diaphragm pressing plates, and an upper nut is arranged on the upper screw.

Description

Technical Field

[0001] The utility model relates to the technical field of control valves for water treatment and filtering equipment, in particular to a double-chamber hydraulic control valve for backwash control of water treatment and filtering equipment. Background Art

[0002] At present, in the domestic water treatment industry, filters that can automatically control the backwashing and sewage discharge process are all realized by the switch of electric ball valves or electric butterfly valves. In order to drive the electric valve to work, it is necessary to add a driving power circuit at the installation of the electric valve, which is generally AC 220V or converts AC into 12V-48V DC through a rectifier transformer; limited by the service life and working stability of the electric head and the performance of the valve itself, this electric valve often overheats when it is frequently switched on and off, and has the disadvantages of high power consumption, easy damage to the valve and electric head, complex wiring of the drive line, high cost, poor safety, cumbersome programming of automatic control and low reliability, resulting in frequent operation stoppages, maintenance, replacement and other accidents during the use of the equipment. This maintenance and replacement debugging has a certain technical threshold, which causes the automation equipment to increase the additional equipment use and maintenance costs while improving the efficiency, and fails to produce the economic and social benefits that the application of automation equipment should bring;

[0003] Therefore, in view of the technical problems described above, there is an urgent need for a double-chamber hydraulic control valve for backwash control of water treatment and filtration equipment. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the defects of the above-mentioned technology and provide a double-chamber hydraulic control valve for backwash control of water treatment and filtration equipment with reliable performance, simple configuration, low energy consumption, low use cost, simple maintenance, safety and reliability.

[0005] In order to solve the above technical problems, the technical solution provided by the utility model is a double-chamber hydraulic control valve for backwash control of water treatment and filtration equipment, comprising:

[0006] The diaphragm is provided with a valve cover, a driving cavity, a diaphragm pressure plate, a driving cavity diaphragm, a valve seat, a valve stem, a spring and a valve plate supporting mechanism. The upper end of the valve body is provided with a valve cover, a driving cavity is formed inside the valve body and the valve cover, the driving diaphragm is arranged between the valve body and the valve cover, a water inlet and a water outlet are respectively arranged at the left and right ends below the valve body and connected with the driving cavity, a placing table is provided in the valve body, the driving cavity diaphragm is arranged on the placing table in the driving cavity, the driving cavity diaphragm is located below the driving diaphragm, diaphragm pressure plates are symmetrically provided at the upper and lower ends of the driving diaphragm, a sliding hole is provided in the middle of the driving cavity diaphragm, and the valve stem is slidably arranged in the sliding hole. An upper screw and a lower screw are respectively provided at the upper and lower ends of the valve stem, the upper screw extends upward and passes through the driving diaphragm and two diaphragm pressure plates, an upper nut is provided on the upper screw, the spring is placed in the driving cavity above the driving cavity diaphragm, the other end of the spring is against the diaphragm pressure plate to provide power for the movement of the driving diaphragm, a valve plate auxiliary mechanism is provided on the lower screw, a lower nut is provided on the lower screw to fix the valve plate auxiliary mechanism, a mounting platform is provided at the position where the water inlet and the driving cavity are connected in the valve body, the valve seat is arranged on the mounting platform, and the lower end of the valve plate auxiliary mechanism cooperates with the valve seat to adjust the connection between the water inlet and the driving cavity;

[0007] A through hole is provided in the valve stem, and an upper screw and a lower screw extend from both ends of the through hole respectively, for connecting the water inlet and the driving cavity above the driving diaphragm;

[0008] The valve body is provided with a threaded hole, the bottom of the threaded hole is provided with a connecting hole, and the connecting hole extends into the driving cavity;

[0009] A sleeve is provided at the top of the valve cover, a screw hole communicating with the drive chamber is provided at the top sleeve of the valve cover, a two-position three-way solenoid valve is provided in the threaded hole and the screw hole, and two of the two-position three-way solenoid valves are connected by a pipeline;

[0010] The connection between the sliding hole and the valve stem, the contact position between the driving cavity partition and the placement platform, and the contact position between the valve seat and the mounting platform are all sealed.

[0011] As an improvement, the spring is located above the driving diaphragm, in the driving cavity between the driving diaphragm and the valve cover, one end of the spring is sleeved on the sleeve, and the lower end of the spring is against the diaphragm pressure plate located above.

[0012] As an improvement, the spring is located below the driving diaphragm, in the driving cavity between the driving diaphragm and the driving cavity partition, the upper end of the spring abuts against the diaphragm pressure plate located above, and the lower end of the spring abuts against the driving cavity partition.

[0013] As an improvement, an annular mounting groove is provided at corresponding positions of the upper end of the valve body and the lower end of the valve cover, and a mounting portion is provided on the circumference of the driving diaphragm, and the mounting portion is fixed in the annular mounting groove.

[0014] As an improvement, the valve plate supporting mechanism includes a valve plate, a sealing gasket and a bottom plate, wherein the valve plate, the sealing gasket and the bottom plate are all installed on the lower screw, the sealing gasket is located between the valve plate and the bottom plate, and the sealing gasket cooperates with the valve seat.

[0015] As an improvement, the bottom plate diameter is smaller than the sealing gasket diameter, and the bottom plate diameter is smaller than the valve seat inner diameter.

[0016] Compared with the prior art, the advantages of the utility model are as follows: 1. A two-position three-way solenoid valve is provided in both the threaded hole and the screw hole, and the two-position three-way solenoid valve with extremely low power consumption is used to switch the water flow pressure in and out of the driving chamber, and the valve is opened and closed with the pipeline's own pressure as the driving force, which greatly reduces energy consumption;

[0017] 2. A drive cavity is formed inside the valve body and the valve cover. The drive diaphragm is arranged between the valve body and the valve cover. The drive diaphragm divides the entire drive cavity into two chambers, the upper and lower chambers. By utilizing the double-cavity structure of this valve, the normally open and normally closed settings of the initial state are realized through the cooperation of the spring and the drive diaphragm. In this way, a group of such valves working in coordination can simultaneously realize the change of the switch state under the control of a two-position three-way solenoid valve, reducing the number of electrical components used, saving costs and improving reliability;

[0018] 3. Simplify the complex automatic control PLC programming into the realization of a switch action, lowering the technical threshold for use and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The utility model is a three-dimensional structural schematic diagram of a double-chamber hydraulic control valve for backwash control of water treatment and filtering equipment in accordance with a first embodiment of the present invention.

[0020] Figure 2 The utility model is a front view of a first embodiment of a double-chamber hydraulic control valve for backwash control of a water treatment and filtering device.

[0021] Figure 3 It is a left view of a first embodiment of a double-chamber hydraulic control valve for backwash control of a water treatment and filtering device according to the utility model.

[0022] Figure 4 yes Figure 3 Cross-sectional view at AA in the middle.

[0023] Figure 5 The utility model is a disassembled state diagram of a first embodiment of a double-chamber hydraulic control valve for backwash control of a water treatment and filtering device.

[0024] Figure 6It is a front view of the internal structure of a first embodiment of a double-chamber hydraulic control valve for backwash control of a water treatment and filtering device according to the utility model.

[0025] Figure 7 It is a top perspective view of the internal structure of a first embodiment of a double-chamber hydraulic control valve for backwash control of a water treatment and filtering device according to the utility model.

[0026] Figure 8 This is a bottom-up stereoscopic view of the internal structure of a double-chamber hydraulic control valve for backwash control of a water treatment and filtration device according to the utility model. Figure 1 .

[0027] Fig. 9 This is a bottom-up stereoscopic view of the internal structure of a double-chamber hydraulic control valve for backwash control of a water treatment and filtration device according to the utility model. Figure 2 .

[0028] Fig.10 The utility model is a schematic structural diagram of a valve cover of a double-chamber hydraulic control valve for backwash control of a water treatment and filtering device according to an embodiment of the present invention.

[0029] Fig.11 It is a right view of a second embodiment of a double-chamber hydraulic control valve for backwash control of a water treatment and filtering device according to the utility model.

[0030] Fig.12 yes Fig.11 Cross-sectional view at BB in the middle.

[0031] As shown in the figure:

[0032] 100. Valve body, 101. Drive chamber, 102. Water inlet, 103. Water outlet, 104. Placement table, 105. Upper screw, 106. Lower screw, 107. Upper nut, 108. Sleeve, 109. Mounting table, 110. Threaded hole, 111. Connecting hole, 112. Lower nut, 200. Valve cover, 201. Circular mounting groove, 202. Screw hole, 203. Two-position three-way solenoid valve, 300. Drive diaphragm, 301. Mounting part, 400. Diaphragm pressure plate, 500. Drive chamber diaphragm, 501. Second O-ring sealing gasket, 502. Sliding hole, 600. Valve seat, 700. Valve stem, 701. Through hole, 800. Spring, 901. Valve plate, 902. Sealing gasket, 903. Bottom plate, 904. First O-ring sealing gasket. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0034] Combined with Figure 1-12 , a double-chamber hydraulic control valve for backwash control of water treatment and filtration equipment, comprising:

[0035] A valve body 100, a valve cover 200, a drive diaphragm 300, a diaphragm pressure plate 400, a drive cavity partition 500, a valve seat 600, a valve stem 700, a spring 800 and a valve plate supporting mechanism. The valve body 100 is provided with a valve cover 200 at the upper end, and a drive cavity 101 is formed inside the valve body 100 and the valve cover 200. The drive diaphragm 300 is arranged between the valve body 100 and the valve cover 200. The left and right ends of the lower side of the valve body 100 are respectively provided with a water inlet 102 and a water outlet 103 connected to the drive cavity 101. A placement platform 104 is provided in the valve body 100. The drive cavity partition 500 is arranged on the placement platform 104 in the drive cavity 101, and the drive cavity partition 500 and the placement platform 104 are connected by bolts. The driving chamber partition 500 is located below the driving diaphragm 300. The upper and lower ends of the driving diaphragm 300 are symmetrically provided with diaphragm pressure plates 400. A sliding hole 502 is provided in the middle of the driving chamber partition 500. The valve stem 700 is slidably arranged in the sliding hole 502. The upper and lower ends of the valve stem 700 are respectively provided with an upper screw 105 and a lower screw 106. The upper screw 105 extends upward and passes through the driving diaphragm 300 and the two diaphragm pressure plates 400. The upper nut 107 is provided on the upper screw 105, so that the valve stem 700 and the driving diaphragm 300 can be linked. In addition, the diaphragm pressure plate 400 plays the role of a gasket, which increases the force-bearing area of ​​the driving diaphragm 300 and has a better protective effect on the driving diaphragm 300.

[0036] The spring 800 is placed in the driving chamber 101 above the driving chamber partition 500, and the other end of the spring 800 is against the diaphragm pressure plate 400 to provide power for the movement of the driving diaphragm 300. The lower screw 106 is provided with a valve plate auxiliary mechanism, and the lower screw 106 is provided with a lower nut 112 for fixing the valve plate auxiliary mechanism, so that the driving diaphragm 300 above the valve stem 700 and the valve plate auxiliary mechanism are combined into a whole, and can realize the synchronous movement of the whole. A mounting platform 109 is provided at the position where the water inlet in the valve body 100 and the driving chamber 101 are connected. The valve seat 600 is arranged on the mounting platform 109, and the valve seat 600 and the mounting platform 109 are connected by bolts. The lower end of the valve plate auxiliary mechanism cooperates with the valve seat 600 to adjust the communication between the water inlet 102 and the drive chamber 101. When the valve plate auxiliary mechanism is blocked on the valve seat 600, the water inlet 102 and the drive chamber 101 are disconnected, and water cannot flow. At this time, the valve is closed. When the valve plate auxiliary mechanism leaves the valve seat 600, the water inlet 102 and the drive chamber 101 are connected, and the water inlet 102 to the drive chamber 101 to the water outlet 103 can be connected, and water can flow. At this time, the valve is opened;

[0037] The valve stem 700 is provided with a through hole 701, and an upper screw 105 and a lower screw 106 extend from both ends of the through hole 701, respectively, for connecting the water inlet 102 and the driving chamber 101 above the driving diaphragm 300;

[0038] The valve body 100 is provided with a threaded hole 110 , and a connecting hole 111 is provided at the bottom of the threaded hole 110 , and the connecting hole 111 extends into the driving cavity 101 ;

[0039] A sleeve 108 is provided at the top of the valve cover 200, and a screw hole 202 communicating with the drive chamber 101 is provided at the top sleeve 108 of the valve cover 200. A two-position three-way solenoid valve 203 is provided in both the threaded hole 110 and the threaded hole 202, and the two two-position three-way solenoid valves 203 are connected by a pipeline.

[0040] Water flows into the valve from the water inlet 102, and enters the driving chamber 101 above the driving diaphragm 300 through the valve stem 700. Based on the principle that different pressures are applied to different force-bearing areas under the same pressure, the pressure applied to the driving diaphragm 300 by the spring 800 above the driving diaphragm 300 is accumulated. The downward force applied to the driving diaphragm 300 is greater than the upward force applied to the valve plate auxiliary mechanism. The driving diaphragm 300 will bulge downward, and then push the valve stem 700 to move downward, and push the valve plate auxiliary mechanism downward through the valve stem 700, and finally block the valve seat 600, closing the valve to maintain a normally closed state.

[0041] When the pipeline needs to be opened, the water flow pressure passes through the two-position three-way solenoid valve 203 in the threaded hole 110. Since the position where the connecting hole 111 and the driving chamber 101 are connected is located between the driving diaphragm 300 and the placement table 104, water is connected to the driving chamber 101 between the driving diaphragm 300 and the placement table 104. As the water increases, the pressure acting on the driving diaphragm 300 will gradually increase until the pressure of the water on the driving diaphragm 300 drives the driving diaphragm 300 to push up, and then drives the valve plate auxiliary mechanism to rise through the valve stem 700. At this time, the water inlet 102 and the water outlet 103 are connected, and the valve is opened;

[0042] When closing is required, the two-position three-way solenoid valve 203 in the threaded hole 110 is closed, the water inlet 102 of the driving chamber 101 is closed, and the water outlet 103 is opened to discharge the water and pressure in the lower part of the driving chamber 300, and the driving diaphragm 300 is bulged downward and reset under the action of the spring 800, thereby driving the closing valve plate auxiliary mechanism to close the valve seat 600, that is, closing the valve;

[0043] The connection between the sliding hole 502 and the valve stem 700, the contact position between the driving chamber partition 500 and the placement platform 104, and the contact position between the valve seat 600 and the mounting platform 109 are all sealed.

[0044] The spring 800 is located above the driving diaphragm 300, in the driving chamber 101 between the driving diaphragm 300 and the valve cover 200, one end of the spring 800 is sleeved on the sleeve 108, and the lower end of the spring 800 is against the diaphragm pressure plate 400 located above. This is a normally closed valve.

[0045] The spring 800 is located below the driving diaphragm 300, in the driving chamber 101 between the driving diaphragm 300 and the driving chamber partition 500, the upper end of the spring 800 abuts against the diaphragm pressure plate 400 located above, and the lower end of the spring 800 abuts against the driving chamber partition 500. This is a normally open valve.

[0046] The upper end of the valve body 100 and the lower end of the valve cover 200 are both provided with an annular mounting groove 201 at corresponding positions, and the circumference of the driving diaphragm 300 is provided with a mounting portion 301, and the mounting portion 301 is fixed in the annular mounting groove 201, so that the driving diaphragm 300 is fixed more firmly;

[0047] The valve plate supporting mechanism includes a valve plate 901, a sealing gasket 902 and a bottom plate 903. The valve plate 901, the sealing gasket 902 and the bottom plate 903 are all installed on the lower screw 106. The sealing gasket 902 is located between the valve plate 901 and the bottom plate 903. The sealing gasket 902 cooperates with the valve seat 600 to open and close the valve seat 600.

[0048] The diameter of the bottom plate 903 is smaller than the diameter of the sealing gasket 902 , and the diameter of the bottom plate 903 is smaller than the inner diameter of the valve seat 600 , so that the sealing gasket 902 can directly contact the valve seat 600 to avoid obstruction by the bottom plate 903 .

[0049] A first O-ring sealing gasket 904 is provided at the connection between the valve plate 901 and the lower screw rod 106 .

[0050] A second O-ring 501 is disposed at the connection between the sliding hole 502 and the valve stem 700 , the contact position between the driving chamber partition 500 and the placement platform 104 , and the contact position between the valve seat 600 and the mounting platform 109 .

[0051] The valve body 100 and the valve cover 200 are connected by bolts.

[0052] In the specific implementation of the present utility model, in Example 1, as shown in FIG. Figure 1-10 The figure shows the normally closed state of the valve.

[0053] The valve is connected to the water pipeline through the water inlet 102 and the water outlet 103. Water flows into the valve from the water inlet 102, and then enters the driving chamber 101 above the driving diaphragm 300 through the through hole 701 in the valve stem 700. At the same time, the two-position three-way solenoid valve 203 on the top of the valve cover 200 is opened, and water is also added to the driving chamber 101 above the driving diaphragm 300 through the two-position three-way solenoid valve 203. As the amount of water increases, the water will give the driving diaphragm 300 a downward force. Based on the principle that different pressures are applied to different stress areas under the same pressure, the pressure applied to the driving diaphragm 300 by the spring 800 above the driving diaphragm 300 is accumulated, and the downward force applied to the driving diaphragm 300 is greater than the upward impact force of the water on the valve plate supporting mechanism. The driving diaphragm 300 will bulge downward, and then push the valve stem 700 to move downward, and push the valve plate supporting mechanism downward through the valve stem 700. Finally, the sealing gasket 902 blocks the valve seat 600, closing the valve and maintaining the normally closed state.

[0054] When it is necessary to open the pipeline, the two-position three-way solenoid valve 203 on the valve body 100 is opened, and the water flow pressure passes through the two-position three-way solenoid valve 203. Since the connection position of the two-position three-way solenoid valve 203 on the valve body 100 is located between the driving diaphragm 300 and the placement table 104, water is connected to the driving chamber 101 between the driving diaphragm 300 and the placement table 104. As the water increases, the pressure acting on the driving diaphragm 300 will gradually increase until the pressure of the water on the driving diaphragm 300 pushes the driving diaphragm 300 upward, and the driving diaphragm 300 will bulge upward, and then drive the valve plate auxiliary mechanism to rise through the valve stem 700, and the sealing gasket 902 will leave the valve seat 600. At this time, the water inlet 102 and the water outlet 103 are connected, and the valve is opened;

[0055] When closing is required, the two-position three-way solenoid valve 203 on the valve body 100 is closed, the water inlet 102 of the drive chamber 101 is closed, and the water outlet 103 is opened to remove the water and pressure in the lower part of the drive chamber 300. The diaphragm 300 is driven to bulge downward and reset under the action of the spring 800, thereby driving the closing valve plate auxiliary mechanism to close the valve seat 600, that is, closing the valve.

[0056] Embodiment 2, as Fig.11 , 12 , which is the normally open valve state of the valve. At this time, the spring 800 is installed on the valve stem 700 and is located between the drive chamber partition 500 and the diaphragm pressure plate 400 below. At this time, the drive diaphragm 300 is bulging upward, and the spring 800 also gives the drive diaphragm 300 an upward force to stabilize the drive diaphragm 300 in the upward bulging state, so that the sealing gasket 902 below will always leave the valve seat 600, the water inlet 102 and the water outlet 103 are always connected, and the valve is in a normally open state.

[0057] If closing is required, the water in the driving chamber 101 below the driving chamber partition 500 will enter the driving chamber 101 above the driving diaphragm 300 through the through hole 701 in the valve stem 700, and at the same time, the two-position three-way solenoid valve 203 on the top of the valve cover 200 is opened, and water is also added to the driving chamber 101 above the driving diaphragm 300 through the two-position three-way solenoid valve 203. As the amount of water increases, the water will give the driving diaphragm 300 a downward force. When the pressure above the driving diaphragm 300 is greater than the pressure given to the driving diaphragm 300 by the spring 800, the driving diaphragm 300 will bulge downward, and then will push the valve stem 700 to move downward, and push the valve plate auxiliary mechanism downward through the valve stem 700, and finally the sealing gasket 902 blocks the valve seat 600 to close the valve.

[0058] In the description of the embodiments of the present utility model, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate an orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, it is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0059] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0060] In the description of the embodiments of the present invention, "multiple" means at least 2.

[0061] In the description of the embodiments of the present utility model, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0062] The above description of the utility model and its implementation methods is not restrictive. The drawings show only one implementation method of the utility model, and the actual structure is not limited thereto. In short, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the invention of the utility model, they should all fall within the protection scope of the utility model.

Claims

1. A double-chamber hydraulic control valve for backwash control of water treatment and filtration equipment, characterized in that: include: A valve body (100), a valve cover (200), a driving diaphragm (300), a diaphragm pressure plate (400), a driving chamber diaphragm (500), a valve seat (600), a valve stem (700), a spring (800) and a valve plate auxiliary mechanism, wherein the valve body (100) is provided with a valve cover (200) at the upper end, a driving chamber (101) is formed inside the valve body (100) and the valve cover (200), the driving diaphragm (300) is arranged between the valve body (100) and the valve cover (200), and the valve body (100) is provided with a valve cover (200) at the lower end. A water inlet (102) and a water outlet (103) are respectively provided at both ends thereof and are communicated with the drive chamber (101); a placement platform (104) is provided inside the valve body (100); the drive chamber partition (500) is arranged on the placement platform (104) inside the drive chamber (101); the drive chamber partition (500) is located below the drive diaphragm (300); diaphragm pressure plates (400) are symmetrically provided at the upper and lower ends of the drive diaphragm (300); a sliding hole (502) is provided in the middle of the drive chamber partition (500); and the valve stem (700) is slidably disposed in the sliding hole (502), the upper and lower ends of the valve stem (700) are respectively provided with an upper screw (105) and a lower screw (106), the upper screw (105) extends upward and passes through the driving diaphragm (300) and the two diaphragm pressure plates (400), the upper screw (105) is provided with an upper nut (107), the spring (800) is placed in the driving cavity (101) above the driving cavity diaphragm (500), and the other end of the spring (800) is against the diaphragm pressure plate (400), In order to provide power for driving the movement of the diaphragm (300), a valve plate supporting mechanism is provided on the lower screw rod (106), and a lower nut (112) is provided on the lower screw rod (106) for fixing the valve plate supporting mechanism. A mounting platform (109) is provided at a position where the water inlet and the driving chamber (101) are connected in the valve body (100), and the valve seat (600) is arranged on the mounting platform (109). The lower end of the valve plate supporting mechanism cooperates with the valve seat (600) to adjust the connection between the water inlet (102) and the driving chamber (101); The valve stem (700) is provided with a through hole (701), and an upper screw rod (105) and a lower screw rod (106) extend from both ends of the through hole (701) respectively, for connecting the water inlet (102) and the driving chamber (101) above the driving diaphragm (300); The valve body (100) is provided with a threaded hole (110), a connecting hole (111) is provided at the bottom of the threaded hole (110), and the connecting hole (111) extends into the driving cavity (101); A sleeve (108) is provided at the top of the valve cover (200), a screw hole (202) communicating with the drive chamber (101) is provided at the top sleeve (108) of the valve cover (200), a two-position three-way solenoid valve (203) is provided in both the threaded hole (110) and the threaded hole (202), and the two two-position three-way solenoid valves (203) are connected via a pipeline; The connection between the sliding hole (502) and the valve stem (700), the contact position between the driving chamber partition (500) and the placement platform (104), and the contact position between the valve seat (600) and the mounting platform (109) are all sealed.

2. A double-chamber hydraulic control valve for backwash control of water treatment and filtration equipment according to claim 1, characterized in that: The spring (800) is located above the driving diaphragm (300) and in the driving chamber (101) between the driving diaphragm (300) and the valve cover (200). One end of the spring (800) is sleeved on the sleeve (108), and the lower end of the spring (800) is against the diaphragm pressure plate (400) located above.

3. A double-chamber hydraulic control valve for backwash control of water treatment and filtration equipment according to claim 1, characterized in that: The spring (800) is located below the driving diaphragm (300), in the driving cavity (101) between the driving diaphragm (300) and the driving cavity partition (500), the upper end of the spring (800) abuts against the diaphragm pressure plate (400) located above, and the lower end of the spring (800) abuts against the driving cavity partition (500).

4. A double-chamber hydraulic control valve for backwash control of water treatment and filtration equipment according to claim 1, characterized in that: An annular mounting groove (201) is provided at corresponding positions of the upper end of the valve body (100) and the lower end of the valve cover (200), and an mounting portion (301) is provided on the circumference of the driving diaphragm (300), and the mounting portion (301) is fixed in the annular mounting groove (201).

5. A double-chamber hydraulic control valve for backwash control of water treatment and filtration equipment according to claim 1, characterized in that: The position where the connection hole (111) and the driving chamber (101) communicate is located between the driving diaphragm (300) and the placement platform (104).

6. A double-chamber hydraulic control valve for backwash control of water treatment and filtration equipment according to claim 1, characterized in that: The valve plate assembly includes a valve plate (901), a sealing gasket (902) and a bottom plate (903); the valve plate (901), the sealing gasket (902) and the bottom plate (903) are all installed on the lower screw (106); the sealing gasket (902) is located between the valve plate (901) and the bottom plate (903); the sealing gasket (902) and the valve seat (600) cooperate.

7. A double-chamber hydraulic control valve for backwash control of water treatment and filtration equipment according to claim 6, characterized in that: The diameter of the bottom plate (903) is smaller than the diameter of the sealing gasket (902), and the diameter of the bottom plate (903) is smaller than the inner diameter of the valve seat (600).

8. A double-chamber hydraulic control valve for backwash control of water treatment and filtration equipment according to claim 6, characterized in that: A first O-ring sealing gasket (904) is provided at the connection between the valve plate (901) and the lower screw rod (106).

9. A double-chamber hydraulic control valve for backwash control of water treatment and filtration equipment according to claim 1, characterized in that: A second O-ring sealing gasket (501) is provided at the connection between the sliding hole (502) and the valve stem (700), the contact position between the drive chamber partition (500) and the placement platform (104), and the contact position between the valve seat (600) and the mounting platform (109).

10. A double-chamber hydraulic control valve for backwash control of water treatment and filtration equipment according to claim 1, characterized in that: The valve body (100) and the valve cover (200) are connected by bolts, the drive chamber partition (500) and the placement platform (104) are connected by bolts, and the valve seat (600) and the mounting platform (109) are connected by bolts.

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