Automatic pressure regulating valve for water reuse in sewage treatment plant

Abstract

The present application relates to pressure regulating valve technical field, specifically to a kind of automatic pressure regulating valve for water reuse in sewage treatment plant, including valve seat, the two sides of valve seat are respectively connected with liquid inlet pipe and liquid outlet pipe, the inner wall of liquid inlet pipe is sealingly connected with filter cartridge, limiting rod is arranged between the side wall of valve seat inner cavity, connecting block is arranged on the side wall of the closed end of filter cartridge, first spring is sleeved on the outer wall of limiting rod, valve seat is rotatably connected with rotating rod, rotating gear is fixed on the outer wall of rotating rod, one connecting block is fixedly connected with rack, which is matched with rotating gear, rotating rod one end penetrates valve seat and is installed with rotating handle, locking assembly is installed on the side wall of valve seat, which is matched with rotating rod, the present application is sealed slidingly arranged in liquid inlet pipe by filter cartridge, and it is axially moved under the balance effect of water pressure and first spring sleeved on limiting rod, automatically changes the flow area to realize pressure regulating, so that filtering and pressure regulating function are integrated in the same valve body, and system structure is simplified.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pressure regulating valve, in particular to an automatic pressure regulating valve for water reuse in sewage treatment plant. BACKGROUND

[0002] In the water reuse system of sewage treatment plant, the treated water needs to be delivered to different users or process links, and these links have different requirements for water supply pressure. Therefore, pressure regulating valves need to be set in the pipe network to stabilize or adjust the output water pressure. The existing pressure regulating valves mostly adopt pilot type or direct acting type, and the structure is relatively complex. For the middle water containing a small amount of suspended solids, the key moving pair in the valve is easy to be stuck due to impurity accumulation, which affects the pressure regulating accuracy and reliability. Therefore, an automatic pressure regulating valve which integrates filtering, self-cleaning and pressure regulating, and has simple structure and convenient maintenance is urgently needed. SUMMARY

[0003] The present application provides an automatic pressure regulating valve for water reuse in sewage treatment plant, which has compact structure, automatic filtering, stable pressure regulating and convenient operation and maintenance.

[0004] To achieve the above-mentioned purpose, the technical scheme provided by the present application is as follows:

[0005] An automatic pressure regulating valve for water reuse in sewage treatment plant, comprising a valve seat, the two side surfaces of the valve seat are respectively connected with a liquid inlet pipe and a liquid outlet pipe, a filter cartridge is sealingly and slidably connected to the inner wall of the liquid inlet pipe, and the end of the filter cartridge close to the liquid inlet is provided with an opening, and the other end is provided with a closed structure, a limiting rod is arranged between the side walls of the inner cavity of the valve seat, a connecting block is arranged on the side wall of the closed end of the filter cartridge and cooperates with the limiting rod, a first spring is sleeved on the outer wall of the limiting rod, and the first spring is located between the connecting block and the inner wall of the valve seat, a rotating rod is rotatably connected through the valve seat, a rotating gear is fixedly connected to the outer wall of the rotating rod, a rack is fixedly connected to one of the connecting blocks and cooperates with the rotating gear, a rotating handle is installed at one end of the rotating rod and extends out of the valve seat, and a locking assembly is installed on the side wall of the valve seat and cooperates with the rotating rod.

[0006] Preferably, a housing is installed on the side wall of the valve seat, a pointer pressure gauge is installed on one side surface of the housing, the pointer of the pointer pressure gauge is inserted into the housing and is provided with a driven bevel gear, and a driving bevel gear is fixedly connected to the outer wall of the rotating rod and is in mesh connection with the driven bevel gear.

[0007] Preferably, the locking assembly comprises a locking sleeve installed on the top of the housing, and a limiting groove is formed in the inner wall of the locking sleeve.

[0008] The rotating rod is a telescopic rod, the telescopic end of the rotating rod penetrates through the locking sleeve and is provided with a rotating handle, and the telescopic end of the rotating rod is symmetrically provided with elastic elements matched with the limiting grooves on the opposite two side walls, and the rotating handle is provided with pressing elements matched with the elastic elements on the opposite two sides.

[0009] Preferably, the elastic elements comprise arc-shaped limiting blocks slidingly embedded in the side walls of the rotating rod, the arc-shaped limiting blocks are provided with connecting rods at the top ends inside the rotating rod, a second spring is connected between the two arc-shaped limiting blocks, and the pressing elements are two pressing blocks connected with the two connecting rods respectively.

[0010] Preferably, the inner wall of the limiting groove and the outer side surface of the arc-shaped limiting block are both subjected to frosted treatment.

[0011] Preferably, a fixed sleeve is fixedly installed on the side of the inner cavity of the valve seat away from the liquid inlet pipe, a spiral groove is formed in the inner wall of the fixed sleeve, a fixed rod is fixedly connected to the closed end of the liquid inlet pipe and inserted into the fixed sleeve, a guide pin matched with the spiral groove is fixedly connected to the outer wall of the fixed rod, a cleaning scraping ring is arranged on the inner wall of the side of the valve seat communicating with the liquid inlet pipe, and the cleaning scraping ring is sleeved on the outer wall of the filter cylinder and abuts against the outer wall of the filter cylinder.

[0012] Preferably, a flexible brush matched with the filter cylinder is arranged on the inner wall of the cleaning scraping ring.

[0013] Preferably, an annular groove is formed in the outer wall of the closed end of the filter cylinder, and the connecting block is rotatably embedded in the annular groove.

[0014] Preferably, the fixed rod is of a hollow structure, a plugging rod is inserted into the inner cavity of the fixed rod, and a door-shaped hook is arranged on one end of the plugging rod penetrating out of the fixed rod, and an operation hole matched with the fixed sleeve is formed in the side wall of the valve seat.

[0015] Preferably, the inside of the closed end of the filter cylinder is of a conical shape.

[0016] Compared with the prior art, the present application has the following beneficial effects:

[0017] In the present application, the filter cylinder is sealingly and slidingly arranged in the liquid inlet pipe and axially moves under the balance of the water pressure and the first spring sleeved on the limiting rod, so that the flow area is automatically changed to realize pressure regulation, thereby integrating the filtering and pressure regulating functions in the same valve body, simplifying the system structure; meanwhile, the rotating rod penetrating through the valve seat drives the meshing transmission of the rotating gear and the rack on the connecting block, so that the position of the filter cylinder can be accurately and conveniently manually adjusted, thereby setting the outlet pressure value of the pressure regulating valve, and the set position is reliably locked by the locking assembly, effectively preventing the pressure drift caused by vibration or misoperation and ensuring the long-term stable operation of the pressure regulating valve under the set working condition. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the pressure regulating valve of the present invention;

[0020] Figure 2 This is a schematic diagram of the front section structure of the pressure regulating valve of the present invention;

[0021] Figure 3 for Figure 2 Enlarged structural diagram at point A;

[0022] Figure 4 for Figure 2 Enlarged structural diagram at point B;

[0023] Figure 5 This is a schematic diagram of the rotating rod and its connecting components in the pressure regulating valve of the present invention;

[0024] Figure 6 for Figure 5 A schematic diagram of the front section structure.

[0025] The attached diagram lists the components represented by each number as follows:

[0026] 1. Valve seat; 101. Fixing sleeve; 102. Spiral groove; 2. Inlet pipe; 21. Fixing rod; 22. Guide pin; 23. Cleaning scraper ring; 24. Sealing rod; 3. Drain pipe; 4. Filter cartridge; 41. Annular groove; 5. Limiting rod; 6. Connecting block; 7. First spring; 8. Rotating rod; 81. Arc-shaped limiting block; 82. Connecting rod; 83. Second spring; 9. Rotating gear; 10. Rack; 11. Rotating handle; 111. Pressing element; 12. Locking assembly; 121. Locking sleeve; 122. Limiting groove; 13. Housing; 14. Pointer pressure gauge; 15. Driven bevel gear; 16. Driving bevel gear. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] like Figures 1-6 As shown: An automatic pressure regulating valve for wastewater reuse in a wastewater treatment plant includes a valve seat 1. An inlet pipe 2 and a drain pipe 3 are respectively connected to the two sides of the valve seat 1. A filter cylinder 4 is slidably connected to the inner wall of the inlet pipe 2, with an opening at one end near the inlet and a closed structure at the other end. A limit rod 5 is provided between the inner walls of the valve seat 1. A connecting block 6, which cooperates with the limit rod 5, is provided on the closed end side wall of the filter cylinder 4. A first spring 7 is sleeved on the outer wall of the limit rod 5, and the first spring 7 is located between the connecting block 6 and the inner wall of the valve seat 1. A rotating rod 8 is rotatably connected through the valve seat 1. A rotating gear 9 is fixedly connected to the outer wall of the rotating rod 8. A rack 10, which cooperates with the rotating gear 9, is fixedly connected to one of the connecting blocks 6. One end of the rotating rod 8 extends out of the valve seat 1 and is equipped with a rotating handle 11. A locking assembly 12, which cooperates with the rotating rod 8, is installed on the side wall of the valve seat 1.

[0029] Specifically, a housing 13 is installed on the side wall of the valve seat 1, and a pointer pressure gauge 14 is installed on one side of the housing 13. One end of the pointer pressure gauge 14 is inserted into the housing 13 and a driven bevel gear 15 is installed thereon. A driving bevel gear 16 that meshes with the driven bevel gear 15 is fixed to the outer wall of the rotating rod 8.

[0030] As can be seen from the above description, during the sliding pressure adjustment process of the filter cartridge, the first rack can drive the rotating rod to rotate, causing the active bevel gear to drive the driven bevel gear to rotate synchronously, thereby driving the pressure gauge pointer to deflect and intuitively display the current pressure value, making the pressure visible and accurate.

[0031] Specifically, the locking assembly 12 includes a locking sleeve 121 mounted on the top of the housing 13, and a limiting groove 122 is formed on the inner wall of the locking sleeve 121;

[0032] The rotating rod 8 is a telescopic rod. The telescopic end of the rotating rod 8 passes through the locking sleeve 121 and is equipped with a rotating handle 11. The telescopic end of the rotating rod 8 is symmetrically provided with elastic elements that cooperate with the limiting groove 122 on both sides. The rotating handle 11 is provided with pressing elements 111 that cooperate with the elastic elements on both sides.

[0033] As can be seen from the above description: Under normal circumstances, the elastic element is located outside the limiting groove, allowing the rotating rod to rotate smoothly without affecting the use of the filter cylinder. When it is necessary to set the filter cylinder to stay in one position, the position of the filter cylinder is first adjusted by rotating the handle, and then the elastic element is inserted into the limiting groove to prevent the rotating rod from rotating. When adjustment is needed, the pressing parts on both sides are pressed at the same time to make the elastic element retract and disengage from the limiting groove. Then the telescopic rod can be pulled out or rotated for operation. The operation is intuitive and the locking is reliable.

[0034] Specifically, the elastic element includes an arc-shaped limiting block 81 that is slidably embedded in the side wall of the rotating rod 8. A connecting rod 82 is installed at the top of the arc-shaped limiting block 81 inside the rotating rod 8. A second spring 83 is connected between the two arc-shaped limiting blocks 81. The pressing element 111 consists of two pressing blocks, and the two pressing blocks are respectively connected to the two connecting rods 82.

[0035] As described above, the pressing force is transmitted through the pressing block and connecting rod, compressing the second spring to bring the two arc-shaped limiting blocks closer together and disengage from the limiting groove. The structure is simple and the action is sensitive. The inner wall of the limiting groove and the outer surface of the arc-shaped limiting blocks are both frosted.

[0036] Specifically, the inner wall of the limiting groove 122 and the outer surface of the arc-shaped limiting block 81 are both sanded.

[0037] As can be seen from the above description: increasing friction prevents accidental slippage and enhances the locking effect.

[0038] Specifically, a fixing sleeve 101 is fixedly installed on the side of the valve seat 1 away from the liquid inlet pipe 2. A spiral groove 102 is opened on the inner wall of the fixing sleeve 101. A fixing rod 21 inserted into the fixing sleeve 101 is fixedly connected to the closed end of the liquid inlet pipe 2. A guide pin 22 that cooperates with the spiral groove 102 is fixedly connected to the outer wall of the fixing rod 21. A cleaning scraper ring 23 is provided on the inner wall of the side of the valve seat 1 that is connected to the liquid inlet pipe 2. The cleaning scraper ring 23 is sleeved on the outer wall of the filter cylinder 4 and abuts against the outer wall of the filter cylinder 4.

[0039] As described above, when water pressure changes drive the filter cartridge to move axially, the guide pin on the fixed rod moves within the spiral groove of the fixed sleeve, forcing the filter cartridge to rotate while moving axially. As the filter cartridge rotates, its outer surface moves relative to the fixed cleaning scraper ring, scraping away impurities adhering to the outside of the filter screen, achieving automatic online cleaning, preventing filter screen clogging, and maintaining stable filtration and pressure regulation performance.

[0040] Specifically, the inner wall of the cleaning scraper ring 23 is equipped with a flexible brush that cooperates with the filter cartridge 4.

[0041] As can be seen from the above description, flexible brushes can improve cleaning efficiency and reduce wear on the surface of the filter cartridge.

[0042] Specifically, the outer wall of the closed end of the filter cylinder 4 is provided with an annular groove 41, and the connecting block 6 is rotatably embedded in the annular groove 41.

[0043] As can be seen from the above description, the filter cartridge can rotate freely while the connecting block only moves axially without interfering with each other.

[0044] Specifically, the fixed rod 21 has a hollow structure inside, and a sealing rod 24 is inserted into the inner cavity of the fixed rod 21. One end of the sealing rod 24 passes through the fixed rod 21 and is equipped with a door-shaped hook. The valve seat 1 has an operating hole on its side wall that cooperates with the fixed sleeve 101. The closed end of the filter cylinder 4 is set to be conical.

[0045] As can be seen from the above description, when it is necessary to clean the impurities accumulated inside the filter cartridge, the filter cartridge can be adjusted to the limit position where it is fully inserted into the liquid inlet pipe, and then the sealing rod can be pulled out. At this time, water can be turned on to use water pressure to backwash and discharge the dirt inside the filter cartridge. The operation is simple and efficient. The conical inner cavity of the filter cartridge is conducive to guiding the water flow and the discharge of impurities.

[0046] Embodiment 1 of the present invention is as follows:

[0047] An automatic pressure regulating valve for wastewater reuse in a wastewater treatment plant is characterized by its integration of filtration, pressure regulation, and self-cleaning. The valve seat 1 serves as the pressure-bearing body, with an inlet pipe 2 and an outlet pipe 3 connected to its left and right sides, respectively. A cylindrical filter cylinder 4 is inserted from the left inlet pipe 2, with its right end open and its left end closed. The cylinder wall is a filter screen structure that allows water to flow through but intercepts impurities. The filter cylinder 4 achieves a sealed and slidable fit with the inner hole of the inlet pipe 2 through a sealing ring on its outer wall.

[0048] Two parallel limiting rods 5 are fixed inside the valve seat 1. The closed end of the filter cylinder 4 is slidably connected to the limiting rods 5 through two connecting blocks 6. The first spring 7 is sleeved on the limiting rods 5 and is pre-compressed between the connecting block 6 and the inner wall of the right side of the valve seat 1, providing a constant leftward reset force for the filter cylinder 4.

[0049] Automatic pressure regulation process: Water enters the filter cylinder 4 from the inlet pipe 2 and is filtered through the filter screen. The clean water acts on the closed end face of the filter cylinder 4. When the force generated by the inlet water pressure exceeds the preload of the first spring 7, it pushes the filter cylinder 4 and connecting block 6 to move to the right against the elastic force. The right opening of the filter cylinder 4 gradually aligns with the flow channel leading to the drain pipe 3 inside the valve seat 1, increasing the flow area and achieving pressure relief and stabilization. Conversely, when the water pressure decreases, the filter cylinder 4 moves to the left under the action of the first spring 7, reducing the flow area and thus maintaining or increasing the outlet pressure.

[0050] Pressure setting and locking process: The rotating rod 8 passes horizontally through the side wall of the valve seat 1, and the rotating gear 9 is fixed to the part of the rotating rod 8 located in the inner cavity of the valve seat 1. A rack 10 is fixed on a connecting block 6 and meshes with the rotating gear 9. By rotating the rotating handle 11, the position of the connecting block 6 and the filter cylinder 4 can be finely adjusted through the gear and rack transmission, thereby setting the compression amount of the first spring 7, that is, setting the target pressure value.

[0051] The set value is displayed visually through the pointer pressure gauge 14: the driving bevel gear 16 on the rotating rod 8 drives the driven bevel gear 15 on the pointer shaft of the pressure gauge to rotate, causing the pointer to deflect to the corresponding scale.

[0052] After setting, it needs to be locked by locking component 12. Under normal conditions, the two arc-shaped limiting blocks 81 on the side wall of the telescopic end of the rotating rod 8 pop out under the action of the second spring 83 and are stuck in the limiting groove 122 of the locking sleeve 121, so that the rotating rod 8 cannot rotate or move axially. When readjustment is needed, the pressing parts 111 on both sides of the rotating handle 11 are squeezed at the same time, and the two arc-shaped limiting blocks 81 are forced to retract inward and disengage from the limiting groove 122 through the connecting rod 82, so that the rotating rod 8 can be operated freely.

[0053] Self-cleaning process: The fixed sleeve 101 is fixed on the left side of the inner cavity of the valve seat 1. The fixed rod 21 extends from the center of the closed end of the filter cylinder 4 to the left and its end is inserted into the fixed sleeve 101. The guide pin 22 on the fixed rod 21 is embedded in the spiral groove 102 on the inner wall of the fixed sleeve 101. The cleaning scraper ring 23 is fixed on the inner wall of the valve seat 1 and covers the outer wall of the filter cylinder 4.

[0054] When the water pressure changes and drives the filter cylinder 4 to move axially, the fixed rod 21 moves accordingly. Under the constraint of the spiral groove 102, the guide pin 22 forces the fixed rod 21 and the filter cylinder 4 fixed thereto to move axially and rotate around the axis at the same time. The rotation of the filter cylinder 4 causes its outer filter screen to continuously scrape against the fixed cleaning scraper ring 23 (or flexible brush), automatically removing impurities attached to the outside of the filter screen. To ensure that the filter cylinder 4 can rotate freely, an annular groove 41 is machined on the outer wall of its closed end. The connecting block 6 is rotatably embedded in the groove, so that the connecting block 6 can only move axially.

[0055] Internal flushing process: When it is necessary to flush the impurities accumulated inside the filter cylinder 4, first operate the rotating handle 11 to adjust the filter cylinder 4 to the extreme position (leftmost end) where it is fully inserted into the liquid inlet pipe 2. At this time, the filter cylinder 4 is completely inside the liquid inlet pipe 2, so that the flushing water will not flow out. Then, pull out the sealing rod 24 through the operating hole. At this time, the rear end of the hollow inner cavity of the fixing rod 21 is opened, and water is normally introduced. The water pressure will push the impurities accumulated inside the filter cylinder 4, so that they are flushed out of the valve body through the hollow channel of the fixing rod 21, achieving rapid internal cleaning. After cleaning, reinsert the sealing rod 24 and ensure that it is in place.

[0056] The internal conical cavity at the closed end of filter cartridge 4 helps guide impurities to move towards the cartridge wall and be discharged smoothly.

[0057] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0058] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that variations may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An automatic pressure regulating valve for wastewater reuse in a wastewater treatment plant, characterized in that: The valve includes a valve seat (1), on which an inlet pipe (2) and a drain pipe (3) are respectively connected on both sides. A filter cylinder (4) is slidably connected to the inner wall of the inlet pipe (2), and the filter cylinder (4) has an opening at one end near the inlet and a closed structure at the other end. A limit rod (5) is provided between the inner wall of the valve seat (1), and a connecting block (6) that cooperates with the limit rod (5) is provided on the closed end side wall of the filter cylinder (4). A first spring is sleeved on the outer wall of the limit rod (5). 7), and the first spring (7) is located between the connecting block (6) and the inner wall of the valve seat (1). The valve seat (1) is rotatably connected to a rotating rod (8). A rotating gear (9) is fixedly connected to the outer wall of the rotating rod (8). A rack (10) that cooperates with the rotating gear (9) is fixedly connected to one of the connecting blocks (6). One end of the rotating rod (8) passes through the valve seat (1) and is equipped with a rotating handle (11). A locking component (12) that cooperates with the rotating rod (8) is installed on the side wall of the valve seat (1). The locking assembly (12) includes a locking sleeve (121) mounted on the top of the housing (13), and a limiting groove (122) is formed on the inner wall of the locking sleeve (121). The rotating rod (8) is a telescopic rod. The telescopic end of the rotating rod (8) passes through the locking sleeve (121) and is equipped with a rotating handle (11). The telescopic end of the rotating rod (8) is symmetrically provided with elastic elements that cooperate with the limiting groove (122) on both sides. The rotating handle (11) is provided with pressing elements (111) that cooperate with the elastic elements on both sides.

2. The automatic pressure regulating valve for wastewater reuse in a wastewater treatment plant according to claim 1, characterized in that: The valve seat (1) has a housing (13) installed on its side wall. A pointer pressure gauge (14) is installed on one side of the housing (13). One end of the pointer pressure gauge (14) is inserted into the housing (13) and a driven bevel gear (15) is installed thereon. The outer wall of the rotating rod (8) is fixedly connected to a driving bevel gear (16) that meshes with the driven bevel gear (15).

3. The automatic pressure regulating valve for wastewater reuse in a wastewater treatment plant according to claim 1, characterized in that: The elastic element includes an arc-shaped limiting block (81) that is slidably embedded in the side wall of the rotating rod (8). The top of the arc-shaped limiting block (81) is equipped with a connecting rod (82) inside the rotating rod (8). A second spring (83) is connected between the two arc-shaped limiting blocks (81). The pressing element (111) consists of two pressing blocks, and the two pressing blocks are respectively connected to the two connecting rods (82).

4. The automatic pressure regulating valve for wastewater reuse in a wastewater treatment plant according to claim 1, characterized in that: The inner wall of the limiting groove (122) and the outer surface of the arc-shaped limiting block (81) are both sanded.

5. The automatic pressure regulating valve for wastewater reuse in a wastewater treatment plant according to claim 1, characterized in that: A fixing sleeve (101) is fixedly installed on the side of the valve seat (1) away from the liquid inlet pipe (2). The inner wall of the fixing sleeve (101) is provided with a spiral groove (102). The closed end of the liquid inlet pipe (2) is fixedly connected to a fixing rod (21) inserted into the fixing sleeve (101). The outer wall of the fixing rod (21) is fixedly connected to a guide pin (22) that cooperates with the spiral groove (102). A cleaning scraper ring (23) is provided on the inner wall of the side of the valve seat (1) that is connected to the liquid inlet pipe (2). The cleaning scraper ring (23) is sleeved on the outer wall of the filter cylinder (4) and abuts against the outer wall of the filter cylinder (4).

6. The automatic pressure regulating valve for wastewater reuse in a wastewater treatment plant according to claim 5, characterized in that: The inner wall of the cleaning scraper ring (23) is provided with a flexible brush that cooperates with the filter cylinder (4).

7. An automatic pressure regulating valve for wastewater reuse in a wastewater treatment plant according to claim 5, characterized in that: The outer wall of the closed end of the filter cylinder (4) is provided with an annular groove (41), and the connecting block (6) is rotatably embedded in the annular groove (41).

8. An automatic pressure regulating valve for wastewater reuse in a wastewater treatment plant according to claim 5, characterized in that: The fixed rod (21) has a hollow structure inside. A sealing rod (24) is inserted into the inner cavity of the fixed rod (21), and one end of the sealing rod (24) passes through the fixed rod (21) and is provided with a door-shaped hook. The valve seat (1) has an operating hole on its side wall that cooperates with the fixed sleeve (101).

9. An automatic pressure regulating valve for wastewater reuse in a wastewater treatment plant according to claim 8, characterized in that: The closed end of the filter cylinder (4) is cone-shaped.

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