A drain valve with filtration function

Abstract

This utility model provides a drain valve with a filtration function. A pressure gauge is installed on the valve body, and the measuring end of the pressure gauge is connected to the inlet and outlet channels via pressure guide pipes. The valve body contains a side channel and a rotatable valve ball. The valve ball is fixedly connected to one end of a valve stem, and the other end of the valve stem extends out of the valve body and is connected to a handwheel. A radially extending alignment block is provided on the end face of the handwheel, and a corresponding alignment block is provided on the valve body. A sealing mechanism for controlling the connection between the side channel and the outlet is provided inside the valve body. The valve ball contains a first and second water filtration channel that are perpendicular to each other and not interconnected. Filter screens are provided in both the first and second water filtration channels. The two ends of the first and second water filtration channels form switchable fluid communication structures with the side channel, inlet, outlet, and drain port, respectively. When the water pressure difference exceeds a preset threshold, the filter screen is switched and flushed in a timely manner to avoid interruption of the filtration process.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a drain valve with a filtration function. Background Technology

[0002] In industrial production, wastewater treatment, and various fluid transport systems, drain valves are key equipment for ensuring clean discharge of media and maintaining stable system operation. With increasingly stringent environmental protection requirements and growing demands for continuous production processes, higher standards are being set for the filtration performance of drain valves.

[0003] Currently, while traditional drain valves possess basic filtration functions, they have significant shortcomings in practical applications. Most drain valves employ a single filter screen structure, which easily clogs during filtration. This necessitates regular manual disassembly, cleaning, or replacement, consuming substantial manpower and resources and disrupting continuous system operation due to frequent downtime, thus reducing production efficiency. Some drain valves with filtration functions have attempted to incorporate a dual-filter design; however, the lack of precise positioning and linkage control mechanisms during filter switching makes manual operation prone to causing deviations in the filter screen's rotation angle and misalignment of the flow channel. This hinders the smooth connection between filtration and rinsing processes, significantly reducing filtration effectiveness.

[0004] Meanwhile, existing drain valves struggle to intelligently sense the filter's condition. Most rely on manual experience to determine the degree of clogging, or only receive rough information from simple pressure monitoring devices. They cannot accurately and in real-time identify the filter's operating status based on key parameters such as water pressure difference. When filter clogging affects filtration efficiency, it fails to trigger timely switching and flushing actions, leading to abnormal system pressure and poor drainage, thus failing to meet the demands for continuous and stable filtration and drainage under complex operating conditions. Utility Model Content

[0005] In view of this, the present invention proposes a drain valve with a filtration function, which can intelligently sense the status of the filter screen through water pressure difference, and can switch the filter screen and complete the flushing in a timely manner to ensure continuous and stable filtration and sewage discharge.

[0006] The technical solution of this utility model is implemented as follows:

[0007] A drain valve with a filtration function includes: a valve body, wherein the valve body is provided with an inlet, a outlet and a drain port, and a water pressure gauge is installed on the valve body, wherein the detection end of the water pressure gauge is connected to the flow channels on the inlet and outlet sides through pressure guide pipes respectively;

[0008] The valve housing has a side channel and a rotatable valve ball. The valve ball is fixedly connected to one end of the valve stem, and the other end of the valve stem passes through the valve housing and is rigidly connected to the handwheel. The end face of the handwheel has a radially extending alignment block, and the valve housing has a corresponding alignment block that matches the alignment block.

[0009] The valve housing is equipped with a sealing mechanism for controlling the opening and closing of the side channel and the drain outlet;

[0010] The valve ball is provided with a first water filtration channel and a second water filtration channel that are perpendicular to each other and not interconnected. The first water filtration channel and the second water filtration channel are respectively provided with filter screens. The two ends of the first water filtration channel and the second water filtration channel form a switchable fluid communication structure with the side channel, the water inlet, the water outlet and the drain port, respectively.

[0011] When the two ends of the first water filtration channel are connected to the water inlet and the water outlet respectively, the two ends of the second water filtration channel are connected to the drain outlet and the side channel respectively, and the end of the side channel that is not connected to the second water filtration channel is blocked by the blocking mechanism.

[0012] When it is necessary to clean the filter screen of the first water filtration channel, the handwheel is rotated to drive the valve ball to rotate so that both ends of the first water filtration channel are connected to the drain port and the side channel respectively, and the side channel is connected to the drain outlet through the sealing mechanism; at this time, both ends of the second water filtration channel are connected to the inlet and the drain outlet respectively.

[0013] Preferably, the connection between the valve stem and the handwheel is provided with a keyway structure, the keyway structure including a key disposed at the end of the valve stem and a keyway disposed in the handwheel.

[0014] Preferably, four alignment blocks adapted to the alignment block are evenly distributed circumferentially on the valve housing, and the included angle between the centers of adjacent alignment blocks is 90°.

[0015] Preferably, the alignment block is a trapezoidal protrusion on the bottom surface of the handwheel, and the alignment block is a trapezoidal groove on the inner wall of the valve body.

[0016] Preferably, the sealing mechanism includes a screw that passes through the valve housing and is threadedly engaged with the valve housing. One end of the screw is connected to an operating handwheel, and the other end is connected to a blocking block for opening and closing the side channel. A sealing ring is provided between the screw and the valve housing.

[0017] Preferably, the pressure guiding pipe includes a first pressure guiding pipe and a second pressure guiding pipe. The first pressure guiding pipe connects the water pressure gauge detection end to the inlet side channel, and the second pressure guiding pipe connects the water pressure gauge detection end to the outlet side channel. The first pressure guiding pipe and the second pressure guiding pipe are integrated with the water pressure gauge through a T-joint.

[0018] Preferably, the filter screen adopts a double-layer sintered mesh structure.

[0019] Preferably, the outer ends of the water inlet and the water outlet are respectively provided with a pipe joint and a flange. One end of the pipe joint is sealed to the water inlet or the water outlet of the valve body, and the other end is adapted to the inner hole of the flange.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] (1) The drain valve of this utility model achieves uninterrupted filtration through the first and second water filtration channels that are perpendicular to each other and not interconnected within the valve ball. When the first water filtration channel needs cleaning, rotating the handwheel drives the valve ball to switch the connection path. At this time, the second water filtration channel continues to perform filtration, and the filtered clean water is connected to the drain outlet through the side channel to backwash the filter screen of the first water filtration channel. This design not only avoids the cumbersome process of stopping, disassembling, and cleaning traditional drain valves, but also utilizes the filtered water for rinsing, effectively improving cleaning efficiency while ensuring the continuous and stable operation of the drain system.

[0022] (2) The water pressure gauge on the valve body is connected to the inlet and outlet side channels through the pressure guide pipe to monitor the water pressure difference on both sides in real time and intuitively reflect the filter screen blockage. When the pressure difference exceeds the threshold, the operator can quickly switch the water filter channel and start the cleaning program to achieve accurate monitoring and timely maintenance of the sewage valve's working status, extend the service life of the equipment, and reduce operation and maintenance costs.

[0023] (3) The alignment block on the handwheel end face cooperates with the alignment block on the valve body to ensure accurate rotation angle of the valve ball and avoid incorrect switching of the water filter channel. Whether in filtration mode or cleaning mode, this design can ensure stable operation of the drain valve and improve operational reliability and safety.

[0024] (4) The blocking mechanism can flexibly control the opening and closing of the side channel and the drain outlet. During the filtration stage, the blocking mechanism isolates the side channel and the drain outlet to ensure that the water is discharged normally after being filtered by the filter screen; during the cleaning stage, the blocking mechanism opens the passage so that the water filtered by the second water filtration channel flows back through the side channel to flush the first water filtration channel, realizing intelligent switching and efficient utilization of the water flow path. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only preferred embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a front sectional view of a drain valve with a filtration function according to this utility model;

[0027] Figure 2This is a side sectional view of a drain valve with a filtration function according to the present invention.

[0028] Figure 3 This is a partially enlarged cross-sectional view of a drain valve with a filtration function according to this utility model;

[0029] In the diagram, 1. Valve housing; 2. Inlet; 3. Pipe fitting; 4. Flange; 5. Water pressure gauge; 6. Side channel; 7. Sealing ring; 8a. Handwheel; 8b. Operating handwheel; 9. Screw; 10. Plug; 11. Drain outlet; 12. Valve ball; 13. Filter screen; 14a. First water filter channel; 14b. Second water filter channel; 15. Drain port; 16. Valve stem; 17. Alignment block; 18. Alignment block. Detailed Implementation

[0030] To better understand the technical content of this utility model, a specific embodiment is provided below, and the utility model will be further described in conjunction with the accompanying drawings.

[0031] See Figures 1 to 3 The present invention provides a drain valve with a filtration function, including a valve body 1, an inlet 2, a drain outlet 11 and a drain port 15 respectively provided on the valve body 1, and a water pressure gauge 5 installed on the valve body 1. The detection end of the water pressure gauge 5 is connected to the flow channel on the side of the inlet 2 and the drain outlet 11 respectively through a pressure guide pipe.

[0032] The valve housing 1 is provided with a side channel 6 and a rotatable valve ball 12. The valve ball 12 is fixedly connected to one end of the valve stem 16, and the other end of the valve stem 16 passes through the valve housing 1 and is rigidly connected to the handwheel 8a. The end face of the handwheel 8a is provided with a radially extending alignment block 17, and the valve housing 1 is provided with a corresponding alignment block 18 that is adapted to the alignment block 17.

[0033] The valve housing 1 is equipped with a sealing mechanism for controlling the connection and disconnection between the control side channel 6 and the drain outlet 11;

[0034] The valve ball 12 is provided with a first water filtration channel 14a and a second water filtration channel 14b that are perpendicular to each other and not interconnected. The first water filtration channel 14a and the second water filtration channel 14b are respectively provided with filter screens 13. The two ends of the first water filtration channel 14a and the second water filtration channel 14b form a switchable fluid communication structure with the side channel 6, the water inlet 2, the water outlet 11 and the drain port 15 respectively.

[0035] When the two ends of the first water filtration channel 14a are connected to the inlet 2 and the outlet 11 respectively, the two ends of the second water filtration channel 14b are connected to the outlet 15 and the side channel 6 respectively, and the end of the side channel 6 that is not connected to the second water filtration channel 14b is blocked by the blocking mechanism.

[0036] When it is necessary to clean the filter screen 13 of the first water filtration channel 14a, the valve ball 12 is rotated by rotating the handwheel 8a until both ends of the first water filtration channel 14a are connected to the drain port 15 and the side channel 6 respectively, and the side channel 6 is connected to the drain outlet 11 by the sealing mechanism; at this time, both ends of the second water filtration channel 14b are connected to the inlet 2 and the drain outlet 11 respectively.

[0037] Specifically, the drain valve has a valve body 1 as its main body, on which three fluid interfaces are provided: an inlet 2, a drain outlet 11, and a discharge port 15. The outer ends of the inlet 2 and the drain outlet 11 are respectively connected to external pipelines through pipe joints 3 and flanges 4 to form a fluid passage. Inside the valve body 1, there is a rotatable valve ball 12, which is rigidly connected to the handwheel 8a through the valve stem 16. The alignment block 17 on the end face of the handwheel 8a cooperates with the alignment block 18 on the inner wall of the valve body 1 to ensure the precise positioning of the rotation angle of the valve ball 12.

[0038] The water pressure gauge 5 is installed outside the valve body 1, and its detection end is connected to the inlet 2 side channel and the outlet 11 side channel through pressure guide pipes. By monitoring the pressure difference between the two points, the clogging status of the filter screen 13 can be determined in real time, providing a basis for switching the cleaning mode.

[0039] The first water filtration channel 14a and the second water filtration channel 14b inside the valve ball 12 are perpendicular to each other and not connected to each other. Their ports form a switchable connection structure with the side channel 6, water inlet 2, water outlet 11 and drain port 15 inside the valve body 1.

[0040] Filtration mode: When the valve ball 12 rotates to the position where the first water filtration channel 14a connects the inlet 2 and the outlet 11, the second water filtration channel 14b connects the outlet 15 and the side channel 6. At this time, the sealing mechanism is connected to the outlet 11, and the fluid is directly discharged from the inlet 2 after being filtered by the filter screen 13 of the first water filtration channel 14a. The second water filtration channel 14b is in an idle state.

[0041] Cleaning Mode: When it is necessary to clean the filter screen 13 of the first water filtration channel 14a, rotate the handwheel 8a to rotate the valve ball 12 90° (positioned by the alignment block 17 and the alignment block 18) to switch the connection path. At this time, the first water filtration channel 14a connects the drain port 15 and the side channel 6. Simultaneously, operate the operating handwheel 8b of the sealing mechanism to move the block 10 to open the passage between the side channel 6 and the drain port 11. At this time, the second water filtration channel 14b automatically takes over the filtration function. The filtered clean water backwashes the filter screen 13 of the first water filtration channel 14a through the side channel 6, and impurities are discharged through the drain port 15.

[0042] Preferably, the connection between the valve stem 16 and the handwheel 8a is provided with a keyway structure, which includes a key located at the end of the valve stem 16 and a keyway located within the handwheel 8a. The valve stem 16 is a transmission component connecting the valve ball 12 and the handwheel 8a; the handwheel 8a is an operating component used to drive the valve stem 16 and the valve ball 12 to rotate, thereby switching the water filtration channel.

[0043] A key (such as a flat key or a semi-circular key, a conventional transmission structure in this field) is machined at the end of the valve stem 16 (the end connected to the handwheel 8a); correspondingly, a matching keyway is machined in the inner hole of the handwheel 8a (the part used to insert the valve stem 16). When the valve stem 16 is inserted into the inner hole of the handwheel 8a, the key on the valve stem 16 is embedded in the keyway of the handwheel 8a. Through the interlocking of the mechanical structure, a rigid connection is achieved between the valve stem 16 and the handwheel 8a (i.e., when the handwheel 8a rotates, the torque is transmitted to the valve stem 16 through the keyway structure, driving the valve ball 12 to rotate synchronously).

[0044] Preferably, four alignment blocks 18 that are adapted to the alignment blocks are evenly distributed circumferentially on the valve body 1, and the included angle between the centers of adjacent alignment blocks 18 is 90° (circumferentially distributed with the central axis of valve stem 16 and valve ball 12 as the center).

[0045] The valve ball 12 contains a first filtration channel 14a and a second filtration channel 14b that are perpendicular to each other. Channel switching requires the valve ball 12 to rotate 90° (from filtration mode to cleaning mode, or vice versa). Four alignment blocks 18 are evenly distributed 90° around the circumference, corresponding to the initial filtration position, first switching position, second switching position, and reset position (or other functional positions) of the valve ball 12. This ensures that the alignment block 17 and the alignment block 18 precisely engage each time the valve ball 12 rotates 90°, achieving reliable switching of the filtration channels. Personnel in the relevant technical field (such as valve assemblers and maintenance personnel) can quickly determine whether the valve ball 12 has rotated to the correct angle by observing the engagement between the alignment block 17 on the handwheel 8a and the alignment block 18 on the valve body 1, reducing the risk of operational errors.

[0046] Four circumferentially distributed alignment blocks 18 are machined on the inner wall of the valve body 1 (at the position adapted to the end face of the handwheel 8a) through milling, casting, and other processes. Using the central axis of the valve body 1 (which coincides with the axis of the valve stem 16 and the valve ball 12) as a reference, the included angle between the centers of adjacent alignment blocks 18 is strictly 90° using indexing plates, CNC machining, and other methods. This can be achieved by those skilled in the art through conventional machining methods.

[0047] Preferably, the alignment block 17 is a trapezoidal protrusion extending radially from the bottom surface of the handwheel 8a, and the alignment block 18 is a trapezoidal groove corresponding to the inner wall of the valve housing 1. The two shapes are compatible, allowing for mechanical engagement. The trapezoidal bevel design provides a self-guiding function for the alignment block 17 when engaging with the alignment block 18. When the handwheel 8a is rotated, the trapezoidal protrusion of the alignment block 17 slides along the trapezoidal groove of the alignment block 18. Upon reaching a predetermined position (such as when the valve ball 12 rotates 90° to switch the water filter channel), it automatically engages due to the fit of the trapezoidal surfaces, ensuring accurate rotation of the valve ball 12 and preventing incorrect water filter channel connection due to angular deviation, which could affect the normal operation of the drain valve. Compared to other shapes (such as rectangles), the trapezoidal structure provides a larger contact area and friction during engagement. During the operation of the drain valve, fluid pressure fluctuations or external vibrations may cause the handwheel 8a to rotate slightly. The tight fit between the trapezoidal protrusion and the groove can effectively prevent the handwheel 8a from rotating accidentally, ensuring the stability of the valve ball 12 and maintaining the normal operation of the filtration or cleaning mode.

[0048] Preferably, the sealing mechanism is a key component controlling the connection between the control side channel 6 and the drain outlet 11, and mainly consists of a screw 9, an operating handwheel 8b, a plug 10, and a sealing ring 7. The screw 9 penetrates the valve housing 1 and forms a threaded engagement with the internal thread of the valve housing 1; the operating handwheel 8b is installed at the end of the screw 9 located outside the valve housing 1 for easy manual control by the operator; the plug 10 is fixed at the end of the screw 9 located inside the valve housing 1 and is used to block or open the connection between the side channel 6 and the drain outlet 11; the sealing ring 7 is fitted on the contact part between the screw 9 and the valve housing 1 to ensure the sealing of the connection and prevent fluid leakage.

[0049] When switching the operating mode of the drain valve is required, the operator rotates the operating handwheel 8b. Because the screw 9 is threadedly engaged with the valve housing 1, the rotational motion of the operating handwheel 8b is converted into the axial linear motion of the screw 9. The screw 9 drives the plug 10 to move axially. When the plug 10 moves to the connection between the side channel 6 and the drain port 11, it seals the connection. At this time, the drain valve is in filtration mode, and the fluid is filtered only through the filter channel (14a or 14b). When the plug 10 is removed from the connection, the side channel 6 connects with the drain port 11, and the drain valve can enter the cleaning mode, using the filtered fluid to backwash the filter screen. This on / off control method, achieved through threaded transmission, is simple, reliable, and easy to operate. Those skilled in the art can easily understand and implement it based on the principles of mechanical transmission.

[0050] The sealing ring 7 is crucial, as it fills the gap between the screw 9 and the valve housing 1. When the screw 9 moves within the valve housing 1, the sealing ring 7 maintains a good seal, preventing fluid leakage from the connection between the screw 9 and the valve housing 1. The sealing ring 7 can be made of materials with good elasticity and corrosion resistance, such as rubber or polytetrafluoroethylene. Those skilled in the art can select appropriate sealing ring materials and specifications based on the working environment and fluid properties of the drain valve to ensure sealing effectiveness and meet the usage requirements of the drain valve.

[0051] Preferably, the pressure guiding pipe consists of a first pressure guiding pipe and a second pressure guiding pipe. One end of the first pressure guiding pipe is connected to the detection end of the pressure gauge 5, and the other end is connected to the inlet 2 side flow channel. Similarly, one end of the second pressure guiding pipe is connected to the detection end of the pressure gauge 5, and the other end is connected to the outlet 11 side flow channel. Furthermore, the first and second pressure guiding pipes are integrated with the pressure gauge 5 via a tee connector, forming a complete pressure monitoring loop. This structure works closely with components such as the valve body 1 and the pressure gauge 5 to achieve real-time monitoring of the drain valve's operating status. When the drain valve is operating, the fluid pressure in the inlet 2 side flow channel is transmitted to the pressure gauge 5 through the first pressure guiding pipe, while the fluid pressure in the outlet 11 side flow channel is transmitted to the pressure gauge 5 through the second pressure guiding pipe. Based on the received two pressure signals, the pressure gauge 5 calculates the pressure difference between the inlet 2 and the outlet 11. Because the filter screen 13 gradually intercepts impurities during the filtration process, the water flow resistance increases, thereby increasing the pressure difference between the inlet 2 and the outlet 11. Therefore, by monitoring this pressure difference, operators or control systems can intuitively determine the degree of clogging of filter 13.

[0052] The use of a three-way connector enables efficient integration of the first pressure-conducting pipe, the second pressure-conducting pipe, and the water pressure gauge 5. It converges the pressure signals from the inlet 2 and outlet 11 sides and transmits them stably to the water pressure gauge 5, avoiding the problems of complex connections and poor sealing that could arise from multiple independent interfaces. This integration method simplifies the connection structure between the pressure-conducting pipe and the water pressure gauge 5, making the pressure monitoring system more compact and reliable.

[0053] Preferably, the filter screen 13 adopts a double-layer sintered mesh structure, comprising an outer coarse filter screen and an inner fine filter screen. The outer coarse filter screen has a mesh diameter of 0.5-1.5 mm, and the inner fine filter screen has a mesh diameter of 0.1-0.5 mm. The outer coarse filter screen and the inner fine filter screen are formed into a single structure through a vacuum sintering process. The two metal meshes of the double-layer sintered mesh have different mesh sizes and complement each other, forming a multi-layer filtration barrier. When fluid flows through the filter screen 13, larger particles are first intercepted by the outer mesh, while smaller particles are blocked by the inner mesh, achieving efficient filtration of impurities of different particle sizes. This structure can effectively filter suspended solids, particulate pollutants, etc., in the fluid, ensuring that the fluid discharged from the drain outlet 11 achieves a high degree of cleanliness and meets the water quality requirements of the sewage system.

[0054] Through a high-temperature sintering process, the two layers of metal mesh are firmly bonded together to form a single structure with high mechanical strength and resistance to deformation. During the operation of the drain valve, the filter screen 13 needs to withstand the pressure and scouring force of the fluid. The double-layer sintered mesh structure can effectively resist these external forces, making it less prone to damage, deformation, or enlarged mesh openings. This ensures that the filter screen maintains stable filtration performance during long-term use and prevents impurities from leaking due to filter screen damage, thus avoiding disruption to the normal operation of the drain valve.

[0055] Preferably, the outer ends of the inlet 2 and the outlet 11 are respectively provided with a pipe joint 3 and a flange 4. One end of the pipe joint 3 is sealed to the inlet 2 or the outlet 11 of the valve body 1, and the other end is adapted to the inner hole of the flange 4. The end face of the flange 4 is provided with an annular sealing groove, and an elastic sealing ring 7 is embedded in the annular sealing groove. When the flange 4 is connected to the external pipe flange by bolts, the elastic sealing ring 7 is compressed to form a sealing structure.

[0056] In this drain valve, the pipe fitting 3 and flange 4 are key components for connecting the valve body 1 to the external pipeline. The inlet 2 and outlet 11 serve as interfaces between the valve body 1 and the external fluid system, with the pipe fitting 3 and flange 4 respectively installed at their outer ends. The pipe fitting 3 acts as a transitional connection, with one end tightly connected to the inlet 2 or outlet 11 of the valve body 1, and the other end adapted to the flange 4. The flange 4 is then bolted to the corresponding flange on the external pipeline, integrating the drain valve with the entire fluid system. The elastic sealing ring 7, installed in the annular sealing groove on the end face of the flange 4, is a core component ensuring the sealing of the connection, working in conjunction with the pipe fitting 3 and flange 4 to prevent fluid leakage.

[0057] Flange 4 has an annular sealing groove machined on its end face, into which the elastic sealing ring 7 is embedded. When flange 4 is bolted to the external pipe flange, the two flanges move closer together and compress the elastic sealing ring 7 as the bolts are tightened. Under pressure, the elastic sealing ring 7 deforms, filling the tiny gap between flange 4 and the external pipe flange, forming a tight seal and preventing fluid from leaking out of the flange connection. This sealing method utilizes the deformation characteristics of elastic materials, combined with the pressure generated by bolt tightening, to maintain a good sealing effect under different pressure conditions.

[0058] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A drain valve with a filtering function, characterized in that, include: The valve housing is provided with an inlet, a outlet and a drain port respectively. A water pressure gauge is installed on the valve housing. The detection end of the water pressure gauge is connected to the flow channels on the inlet and outlet sides respectively through pressure guide pipes. The valve housing has a side channel and a rotatable valve ball. The valve ball is fixedly connected to one end of the valve stem, and the other end of the valve stem passes through the valve housing and is rigidly connected to the handwheel. The end face of the handwheel has a radially extending alignment block, and the valve housing has a corresponding alignment block that matches the alignment block. The valve housing is equipped with a sealing mechanism for controlling the opening and closing of the side channel and the drain outlet; The valve ball is provided with a first water filtration channel and a second water filtration channel that are perpendicular to each other and not interconnected. The first water filtration channel and the second water filtration channel are respectively provided with filter screens. The two ends of the first water filtration channel and the second water filtration channel form a switchable fluid communication structure with the side channel, the water inlet, the water outlet and the drain port, respectively. When the two ends of the first water filtration channel are connected to the water inlet and the water outlet respectively, the two ends of the second water filtration channel are connected to the drain outlet and the side channel respectively, and the end of the side channel that is not connected to the second water filtration channel is blocked by the blocking mechanism. When it is necessary to clean the filter screen of the first water filtration channel, the handwheel is rotated to drive the valve ball to rotate so that both ends of the first water filtration channel are connected to the drain port and the side channel respectively, and the side channel is connected to the drain outlet through the sealing mechanism; at this time, both ends of the second water filtration channel are connected to the inlet and the drain outlet respectively.

2. The blowdown valve with filtering function according to claim 1, characterized in that, The connection between the valve stem and the handwheel is provided with a keyway structure, which includes a key at the end of the valve stem and a keyway inside the handwheel.

3. The blowdown valve with filtering function according to claim 1, characterized in that, The valve housing is provided with four alignment blocks that are adapted to the alignment block, and the center angle between adjacent alignment blocks is 90°.

4. The blowdown valve with filtering function according to claim 1 or 3, characterized in that, The alignment block is a trapezoidal protrusion on the bottom surface of the handwheel, and the alignment block is a trapezoidal groove on the inner wall of the valve body.

5. The blowdown valve with filtering function according to claim 1, characterized in that, The sealing mechanism includes a screw that passes through the valve housing and is threaded into the valve housing. One end of the screw is connected to an operating handwheel, and the other end is connected to a blocking block for opening and closing the side channel. A sealing ring is provided between the screw and the valve housing.

6. The blowdown valve with filtering function according to claim 1, characterized in that, The pressure guiding pipe includes a first pressure guiding pipe and a second pressure guiding pipe. The first pressure guiding pipe connects the water pressure gauge detection end to the inlet side channel, and the second pressure guiding pipe connects the water pressure gauge detection end to the outlet side channel. The first pressure guiding pipe and the second pressure guiding pipe are integrated with the water pressure gauge through a T-joint.

7. The blowdown valve with filtering function according to claim 1, characterized in that, The filter screen adopts a double-layer sintered mesh structure.

8. The blowdown valve with filtering function according to claim 1, characterized in that, The outer ends of the water inlet and the water outlet are respectively provided with a pipe joint and a flange. One end of the pipe joint is sealed to the water inlet or the water outlet of the valve body, and the other end is adapted to the inner hole of the flange.

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