A three-way piston valve suitable for high-pressure turbid water

Abstract

The present application relates to the technical field of valve, specifically to a three-way piston valve suitable for high-pressure turbid ring water, comprising a middle valve body component group, two middle valve seats for cutting off or conducting fluid path are arranged in the middle valve body component group, the middle valve seats are modularly split and are fixed in the middle valve body component group through extrusion force generated by external components; an upper valve component group is connected to the top of the middle valve body component group. Through the modularized press-in valve seat and the self-compensating dynamic sealing structure, the present application solves the pain points of easy wear and tear and difficult replacement of the valve under the working condition of high-pressure turbid ring water; the buffer groove actively captures impurities, cooperates with the lower cavity monitoring mechanism and the window barrel, realizes the external intuitive early warning and auxiliary sealing of leakage failure, significantly reduces the maintenance cost and improves the safety and stability of the complex pipe network operation.

Description

Technical Field

[0001] This invention relates to the field of valve technology, specifically a three-way piston valve suitable for high-pressure turbid circulating water. Background Technology

[0002] In flame cleaning operations in the steel industry, high-pressure turbid circulating water is widely used in processes such as slag granulation, descaling, and slag flushing. This circulating water typically contains a large amount of silt, iron oxide particles, and other small, hard impurities. After being filtered through a cyclone well, it is pumped by a high-pressure pump to the flame cleaning machine's actuator. During the cleaning process, the high-pressure turbid circulating water needs to frequently switch directions via a three-way piston valve to meet the water requirements of different workstations.

[0003] However, conventional three-way piston valves generally have the following technical problems when operating in turbid circulating water containing high concentrations of solid particles: First, valve seat maintenance costs are high. Current valve seats are mostly fixed by being integrally machined, welded, or using an interference fit with the valve body. Under long-term erosion from high-pressure, slag-laden water flow, the valve seat sealing surface is easily damaged. Furthermore, because they are not removable or difficult to disassemble, valve seat failure often leads to the scrapping of the entire valve, imposing a heavy equipment maintenance burden on enterprises.

[0004] Secondly, it has poor resistance to impurities. Hard particles carried by high-pressure water flow can easily accumulate or become stuck between the valve seat and the valve stem sealing part, leading to valve malfunction or poor sealing. At the same time, the high-frequency reciprocating motion makes the valve stem stuffing box part extremely susceptible to wear from impurities, creating a risk of media leakage, and existing structures often lack an effective dynamic seal compensation mechanism.

[0005] Finally, fault monitoring is lagging. Most current three-way piston valves are closed structures, lacking real-time sensing methods for the internal sealing status. When minor leaks occur due to wear of the internal sealing surface caused by foreign objects, maintenance personnel cannot visually observe them from the outside. Often, the leak is only discovered after it has expanded, damaging downstream equipment or causing complete failure of the hydraulic circuit. This reactive maintenance mode greatly limits the operational stability of the production line.

[0006] Therefore, developing a three-way piston valve that can adapt to the harsh working conditions of high-pressure turbid circulating water, and has the functions of easy maintenance, self-compensation of sealing, and visual early warning of leakage has become a technical problem that urgently needs to be solved in the field of flame cleaning machines. Summary of the Invention

[0007] In order to overcome the above-mentioned technical problems, the purpose of this invention is to provide a three-way piston valve suitable for high-pressure turbid circulating water, so as to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: A three-way piston valve suitable for high-pressure turbid circulating water includes: a middle valve body assembly with two middle valve seats inside for cutting off or opening fluid paths, the middle valve seats being modularly separate and fixed within the middle valve body assembly by the compressive force generated by external components; an upper valve assembly connected to the top of the middle valve body assembly for providing driving power and forming a dynamic seal guide; and an adjusting valve stem assembly slidably disposed on the axis between the upper valve assembly and the middle valve body assembly, the end of the adjusting valve stem assembly having a sealing part for sealing with the middle valve seats, and the adjusting valve stem assembly having an annular concave portion for opening different fluid paths.

[0009] Preferably, the valve body component group includes a valve body component, which has three independent liquid channels, namely, a first liquid channel, a second liquid channel, and a third liquid channel, which are controlled to open and close by the regulating valve stem component group; a bottom plug is connected to the third liquid channel.

[0010] Preferably, the upper valve assembly includes a valve cover, and the middle valve seat includes a higher middle valve seat and a lower middle valve seat; the higher middle valve seat is pressed into the middle valve body assembly by the bottom end of the valve cover, and the lower middle valve seat is pressed into the middle valve body assembly by the bottom plug.

[0011] Preferably, the bottom end of the valve cover is provided with four central slots for medium flow, and the valve cover is provided with a special-shaped sealing gasket and a sealing cap for pressing the special-shaped sealing gasket; the bottom of the special-shaped sealing gasket is provided with a spring, which is used to cooperate with the sealing cap to axially compress the special-shaped sealing gasket to compensate for wear gaps.

[0012] Preferably, the inner wall of the middle valve seat is provided with a buffer groove for capturing solid particles; the axial clearance between the two middle valve seats is less than the axial thickness of the bottom sealing part of the regulating valve stem assembly, which is used to radially limit the regulating valve stem assembly.

[0013] Preferably, the irregular-shaped sealing gaskets are provided in three sets and arranged in a stacked manner, and the grooves of the three sets of irregular-shaped sealing gaskets are filled with grease for lubricating the regulating valve stem component assembly.

[0014] Preferably, the upper valve assembly further includes a pneumatic frame, a diaphragm, and a diaphragm cover connected to the valve cover; the regulating valve stem assembly includes a diaphragm baffle that contacts the diaphragm, and a large spring for driving the regulating valve stem to return to its original position is provided between the diaphragm baffle and the valve cover.

[0015] Preferably, it also includes a lower valve body component assembly installed at the bottom of the middle valve body component assembly, and a lower adjusting rod component assembly linked to the adjusting valve rod component assembly; the lower valve body component assembly is provided with a lower cavity for accommodating the leaking liquid, and the lower adjusting rod component assembly is disposed in the lower cavity.

[0016] Preferably, the lower valve body component assembly includes a lower valve housing 1 and a lower valve housing 2 connected to each other, with a transparent viewing window tube provided between the lower valve housing 1 and the lower valve housing 2; a reflective ring that can slide along the axial direction of the lower valve housing 1 is provided in the lower cavity.

[0017] Preferably, a monitoring spring is connected between the reflective ring and the lower valve housing, which is used to reset under pressure when the pressure in the lower cavity increases, so that the reflective ring is displaced within the viewing window tube.

[0018] Preferably, the lower adjustment rod assembly includes a lower adjustment rod connected to the regulating valve rod, and the lower adjustment rod has a lower cover and an adjusting cylinder at its end; the lower cover has a silicone ring for blocking the outward leakage path of the lower valve body assembly under normal conditions.

[0019] Preferably, the adjusting cylinder is provided with a cylinder groove; under normal conditions, the cylinder groove is connected to the inlet of the lower cavity for introducing the leakage liquid; in the reverse state, the adjusting cylinder moves down with the lower adjusting rod and uses the cylinder body to seal the inlet of the lower cavity, while the lower cover opens the channel for the fluid to be discharged outward.

[0020] Compared with the prior art, the beneficial effects of the present invention are: The modular design allows the valve seat to be fixed within the valve body assembly via the valve cover and bottom plug, rather than by traditional welding or interference fit. When the valve seat is damaged by high-pressure turbid water erosion, it can be quickly replaced by simply unscrewing the threaded connection, without having to scrap the entire valve body, which greatly reduces spare parts costs. The specially designed buffer groove in the valve seat can effectively collect hard particles such as iron oxide scale and silt in the medium, preventing impurities from forming "hard support" on the sealing surface, protecting the sealing pair from scratches, and ensuring the tightness of valve closure under slag-containing conditions. The self-compensating mechanism, consisting of a special-shaped sealing gasket and a bottom spring, can automatically compensate for the wear gaps caused by the long-term movement of the packing using elasticity. At the same time, the grease inside forms a protective oil film during movement, which reduces the operating resistance of the regulating valve stem and extends the service life of the dynamic sealing assembly. The distance between the two intermediate valve seats provides effective axial and radial constraints on the regulating valve stem, preventing valve stem displacement under high pressure impact. By setting up a lower cavity, reflective ring, and transparent viewing window, the minute leakage of the internal sealing pair is converted into an intuitive physical displacement signal, allowing inspection personnel to accurately determine the status of internal seals (such as a full buffer tank or a failed sealing ring) without disassembling the valve. The design of the lower cover and silicone ring adds an extra physical barrier against backflow of external pipeline media when the valve is normally closed in the liquid passage. This dual sealing logic greatly improves the operational safety of the system in complex pipeline environments. The linkage between the adjusting cylinder and the lower cavity opening ensures that the monitoring mechanism is connected to the flow channel only when in the "monitoring position" and is in a shielded state when in the "working position" during high-voltage switching. This design avoids the impact of high-voltage pulses on the reflective ring and viewing window during normal switching, ensuring the durability of the detection components and the accuracy of the readings. Attached Figure Description

[0021] Figure 1 This is a schematic cross-sectional view of the overall structure of the present invention; Figure 2 This is a schematic diagram of the valve cover portion of the present invention; Figure 3 This is a schematic diagram of the irregular-shaped sealing gasket portion of the present invention; Figure 4 This is a schematic diagram of the valve seat portion of the present invention; Figure 5 This is a cross-sectional structural schematic diagram of the bottom plug, lower valve body assembly, and lower adjusting rod assembly of the present invention; Figure 6 This is a cross-sectional view of the valve body assembly and the lowering rod assembly in the normal state of the present invention; Figure 7 This is a cross-sectional view of the valve body assembly and the lower adjustment rod assembly during the reversing process of the present invention.

[0022] In the diagram: 10. Middle valve body assembly; 11. Valve body component; 111. Liquid passage one; 112. Liquid passage two; 113. Liquid passage three; 12. Bottom plug component; 13. Middle valve seat; 131. Buffer tank; 20. Upper valve assembly; 21. Valve middle cover; 211. Middle slot; 22. Pneumatic frame; 23. Special-shaped sealing gasket; 24. Sealing gland; 25. Diaphragm component; 26. Diaphragm cover; 30. Adjusting valve stem assembly; 31. Diaphragm baffle; 32. Upper valve stem; 33. Adjusting valve stem component; 40. Lower valve body assembly; 41. Lower valve shell one; 42. Lower valve shell two; 43. Sight window cylinder; 44. Reflective ring; 50. Lower adjusting rod assembly; 51. Lower adjusting rod component; 52. Lower cover component; 521. Silicone ring; 53. Adjusting cylinder; 531. Cylinder slot. Detailed Implementation

[0023] 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.

[0024] One embodiment provided by the present invention: refer to Figures 1-4 A three-way piston valve suitable for high-pressure turbid circulating water, comprising: The middle valve body assembly 10, the upper valve assembly 20, and the regulating valve stem assembly 30.

[0025] The middle valve body component group 10 includes a valve body component 11, which is provided with a liquid passage 111, a liquid passage 2 112 and a liquid passage 3 113. A bottom plug component 12 is connected to the liquid passage 3 113. A middle valve seat 13 is connected inside the valve body component 11, and there are two middle valve seats 13.

[0026] The upper valve component assembly 20 includes a valve cover 21, the bottom end of which is inserted into the valve body 11, and the bottom end of the valve cover 21 is provided with four central slots 211 in a ring. A pneumatic frame 22 is connected to the valve cover 21. The valve cover 21 is provided with a special-shaped sealing gasket 23 and a sealing cover 24. There are three sets of special-shaped sealing gaskets 23. The sealing cover 24 is pressed on the special-shaped sealing gaskets 23 and is connected to the valve cover 21.

[0027] A diaphragm 25 is connected to the pneumatic frame 22, and a diaphragm cover 26 is connected to the diaphragm 25. The top of the diaphragm cover 26 is provided with an air pump interface. The bottom of the irregular sealing gasket 23 is provided with a spring, and the irregular sealing gasket 23 is connected to the valve cover 21 through the spring.

[0028] The regulating valve stem assembly 30 includes a diaphragm baffle 31. The bottom of the diaphragm baffle 31 is provided with an upper valve stem 32 and a regulating valve stem 33. The upper valve stem 32 is connected between the diaphragm baffle 31 and the regulating valve stem 33. The regulating valve stem 33 is slidably connected in the valve cover 21 and the valve body 11. The irregular sealing gasket 23 and the sealing gland 24 are located between the regulating valve stem 33 and the valve cover 21. The spring at the bottom of the sealing gland 24 and the irregular sealing gasket 23 is used to compress the irregular sealing gasket 23 in the middle so that it is fully attached between the regulating valve stem 33 and the valve cover 21 to ensure the sealing between the regulating valve stem 33 and the valve cover 21.

[0029] The top of the diaphragm baffle 31 contacts the bottom of the diaphragm component 25. A large spring is provided between the diaphragm baffle 31 and the valve cover 21. When the air pump on the diaphragm cover 26 is working, gas is injected between the diaphragm component 25 and the diaphragm cover 26 through the air pipe. Under the action of air pressure, the diaphragm component 25 will bulge down, thereby pushing the contacting diaphragm baffle 31 to move down, thereby driving the overall regulating valve stem assembly 30 to move down in the middle valve body assembly 10 and the upper valve assembly 20.

[0030] The two valve seats 13 are divided into a higher valve seat 13 and a lower valve seat 13 according to their different heights.

[0031] The bottom end of the regulating valve stem 33 is used to contact the lower valve seat 13, and the bottom end of the regulating valve stem 33 is also provided with an annular indentation.

[0032] refer to Figure 1 As shown, this is the first working state. At this time, the annular concave part of the regulating valve rod 33 is in the higher middle valve seat 13 position, the first liquid channel 111 and the second liquid channel 112 are connected, the bottom end of the regulating valve rod 33 contacts the lower middle valve seat 13, and the third liquid channel 113 is not connected with the first liquid channel 111 and the second liquid channel 112.

[0033] When the regulating valve stem assembly 30 is pushed down, the bottom end of the regulating valve stem 33 disengages from the lower middle valve seat 13, and the annular concave part will be in the position of the lower middle valve seat 13. The regulating valve stem 33 will then contact the middle valve seat 13. At this time, liquid passage 111 and liquid passage 313 will be connected, and liquid passage 212 will not be connected to liquid passage 111 and liquid passage 313.

[0034] The middle valve seat 13 is provided with a buffer groove 131, which is used to buffer small particulate foreign objects. The higher middle valve seat 13 is pressed into the middle valve body component assembly 10 by the valve cover 21, and the lower middle valve seat 13 is pressed into the middle valve body component assembly 10 by the bottom plug 12. Both middle valve seats 13 are pressed into the middle valve body component assembly 10, which makes disassembly and assembly more convenient.

[0035] The valve cover 21 and the pneumatic frame 22 are connected by threads, the valve cover 21 and the valve body 11 are connected by threads, and the liquid passage 3 113 and the bottom plug 12 are connected by threads. When it is necessary to clean or replace the internal structures of the valve body component assembly 10, the valve cover 21 can be unscrewed from the valve body component assembly 10 and the bottom plug 12 can be unscrewed from the liquid passage 3 113. The two valve seats 13 inserted in the valve body component assembly 10 can then be removed. The overall design makes disassembly and installation simple.

[0036] Example 2: refer to Figures 5-7 A three-way piston valve suitable for high-pressure turbid circulating water also includes: The lower valve body assembly 40 and the lower adjusting rod assembly 50 are installed at the bottom of the middle valve body assembly 10.

[0037] The lower valve body component assembly 40 includes a lower valve housing 1 41 and a lower valve housing 2 42, which are connected by screws. A viewing window tube 43 is connected between the lower valve housing 1 41 and the lower valve housing 2 42. The lower valve housing 1 41, the lower valve housing 2 42 and the viewing window tube 43 form a lower cavity. A reflective ring 44 is slidably connected in the lower cavity. The reflective ring 44 is movably connected in the lower cavity along the axial direction of the lower valve housing 1 41. A spring is provided on the reflective ring 44 and the spring is connected between the reflective ring 44 and the lower valve housing 1 41.

[0038] The lower valve housing 41 is connected to the bottom plug 12 via threads.

[0039] The adjusting rod assembly 50 includes an adjusting rod 51, one end of which is connected to a lower cover 52. A silicone ring 521 is connected to the lower cover 52, and an adjusting cylinder 53 is connected to the lower cover 52. The adjusting cylinder 53 has a cylinder slot 531. The end of the adjusting rod 51 away from the lower cover 52 is connected to the regulating valve rod 33.

[0040] The lower cavity between the lower valve housing 1 41 and the lower valve housing 2 42 has an opening in the corresponding cylindrical slot 531. When the regulating valve rod assembly 30 moves down, it will drive the lower regulating rod assembly 50 to move down together, so that the cylindrical slot 531 on the regulating cylinder 53 and the opening of the lower cavity are misaligned. The cylindrical structure on the upper part of the regulating cylinder 53 will cover the opening of the lower cavity, thereby sealing the lower cavity. The lowered cylindrical slot 531 will be located at the lower part of the lower valve housing 2 42, so that the medium in the middle valve body assembly 10 can flow out through the liquid passage 3 113, the lower valve body assembly 40 and the lower regulating rod assembly 50.

[0041] The lower valve housing 42 has threads on its lower surface for connection with external pipes.

[0042] Working principle: refer to Figures 1-4 , 1. Flow channel switching and action execution logic Normal state (first working state): When the pneumatic system is not started, the preload force provided by the large reset spring between the diaphragm baffle 31 and the valve cover 21 drives the regulating valve stem assembly 30 to reset upward. At this time, the sealing part at the bottom of the regulating valve stem 33 is in close contact with the lower intermediate valve seat 13, blocking the third liquid passage 113; at the same time, the annular concave part of its stem body corresponds exactly to the position of the higher intermediate valve seat 13, so that the first liquid passage 111 and the second liquid passage 112 are connected.

[0043] Reversal (Second Working State): When the air pump inflates through the interface of the diaphragm cover 26, the air pressure pushes the diaphragm 25 to deform downwards against the spring force. The pressure is transmitted to the diaphragm baffle 31, causing the overall regulating valve stem assembly 30 to move downwards. At this time, the bottom end of the regulating valve stem 33 disengages from the lower valve seat 13 and moves downwards to the position of blocking the second liquid passage 112; simultaneously, the first liquid passage 111 connects with the third liquid passage 113 through the annular concave portion, completing the reversal of the medium.

[0044] 2. Adaptive compensation sealing mechanism Dynamic sealing and self-compensation: The regulating valve stem 33 reciprocates frequently within the valve cover 21, and the seal is provided by three sets of overlapping irregularly shaped sealing gaskets 23. Through the constant compression of the bottom spring and the top sealing cap 24, the sealing gaskets undergo radial deformation, always remaining tightly against the stem surface. This elastic compensation mechanism effectively compensates for wear gaps caused by long-term friction, ensuring zero leakage under high-pressure environments.

[0045] Integrated lubrication and friction reduction: The grooves of the stacked irregular-shaped sealing gaskets 23 are pre-filled with grease. During the sliding process of the valve stem, a small amount of grease will overflow to form an oil film, which not only reduces the operating resistance, but also prevents microparticles in the high-pressure turbid circulating water from entering the sealing pair, significantly extending the service life of the seals.

[0046] 3. Protection mechanisms for turbid circulating water conditions Foreign object capture and buffering: For iron oxide scale or sand particles contained in the water, the middle valve seat 13 is specially equipped with a buffer groove 131. When the regulating valve stem 33 is closed, small particles brought in by pressure will be squeezed into the buffer groove 131, preventing particles from forming hard supports between the sealing surfaces, which could lead to valve not closing tightly or scratching the sealing surfaces.

[0047] Anti-eccentricity constraint: The design controls the distance between the two middle valve seats 13 to be less than the thickness of the bottom end of the regulating valve stem 33. The physical aperture of the valve seat forms a radial constraint on the end of the valve stem, effectively preventing the valve stem from swinging or eccentricity under the impact of high pressure fluid, and ensuring the centering of the valve during long-term operation.

[0048] 4. Modular design for easy maintenance Quick-release structure: The four central slots 211 at the bottom of the valve cover 21 ensure the fluid flow area while also acting as limiting components for the embedded structure. By unscrewing the valve cover 21 and the bottom plug 12 via threads, the two valve seats 13, which are in a "sandwich" state, can be directly removed. This non-welded, non-interference fit connection method eliminates the need for specialized tools when replacing vulnerable parts on-site, greatly reducing downtime maintenance costs.

[0049] The working principle of Example 2 is as follows: refer to Figures 5-7The lowering lever assembly 50 moves synchronously with the regulating valve stem assembly 30. Under normal conditions where the air pump is not running, liquid passage 111 and liquid passage 212 are connected, while liquid passage 313 is blocked from liquid passage 111 by the lower end of the regulating valve stem 33. At this time, the lowering lever assembly 50 is in a preset high-level monitoring state within the lower valve body assembly 40.

[0050] In this state, the lower cavity opening is aligned with the cylinder slot 531, making the interior of the bottom plug 12 and the lower cavity in a communication path. When the valve operates under high-pressure turbid water conditions for a long time, if the buffer groove 131 in the middle valve seat 13 is full of impurities, causing damage or poor contact between the lower end of the regulating valve stem 33 and the middle valve seat 13, the medium will leak from the failed seal into the bottom plug 12 below.

[0051] At this time, because the lower cover 52 in the lower lever assembly 50, together with the silicone ring 521, is tightly pressed against the bottom of the lower valve body 42, blocking the path to the external pipeline, the leaking medium is forced to enter the lower cavity through the slot 531 and the lower cavity opening. As the leaking fluid accumulates, the pressure inside the cavity increases, and the pressure overcomes the spring resistance, pushing the reflective ring 44 upward along the axial direction of the lower valve body 41. Maintenance personnel can visually identify the rising reflective ring 44 through the transparent viewing window 43, thus achieving early warning of leakage problems inside the valve body from the outside, significantly improving the timeliness of maintenance.

[0052] In addition, under the above-mentioned normal conditions, the sealing effect of the lower cover 52 and the silicone ring 521 on the bottom of the lower valve housing 42 effectively blocks the backflow of the medium in the external connecting pipe, adding an extra layer of physical protection to the liquid passage 113 and ensuring the reliability of the sealing effect.

[0053] When the system performs a reversal action, the lower adjustment rod assembly 50 moves down synchronously with the regulating valve rod assembly 30. The lower cover 52 and silicone ring 521 disengage from their sealing contact with the lower valve housing 42. The medium in the liquid passage 111 flows smoothly into the external pipeline connected to the lower valve housing 42 through the lower valve seat 13, bottom plug 12, lower valve housing 41, and cylindrical slot 531, realizing the reversal of the liquid path. During this reversal process, the cylindrical solid structure at the top of the adjusting cylinder 53 slides down and precisely blocks the opening of the lower cavity, effectively shielding the high-pressure medium in the flow from entering the lower cavity, avoiding interference from the normal operating pressure flow to the detection mechanism, and ensuring the stability of the monitoring system.

[0054] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A three-way piston valve suitable for high-pressure turbid circulating water, characterized in that, include: The middle valve body component assembly has two middle valve seats inside for cutting off or opening the fluid path. The middle valve seats are modularly separated and are fixed in the middle valve body component assembly by the extrusion force generated by external components. The upper valve assembly is connected to the top of the middle valve body assembly and is used to provide driving power and form a dynamic seal guide; The regulating valve stem assembly is slidably disposed on the axis of the upper valve assembly and the middle valve body assembly. The end of the regulating valve stem assembly is provided with a sealing part for sealing with the middle valve seat, and the regulating valve stem assembly is provided with an annular concave portion for guiding different fluid paths.

2. A three-way piston valve suitable for high-pressure turbid circulating water according to claim 1, characterized in that: The valve body component assembly includes a valve body component, which has three independent liquid channels, namely, a liquid channel one, a liquid channel two, and a liquid channel three, which are controlled to open and close by the regulating valve stem component assembly; a bottom plug is connected to the liquid channel three.

3. A three-way piston valve suitable for high-pressure turbid circulating water according to claim 2, characterized in that: The upper valve assembly includes a valve cover, and the middle valve seat includes a higher middle valve seat and a lower middle valve seat; the higher middle valve seat is pressed into the middle valve body assembly by the bottom end of the valve cover, and the lower middle valve seat is pressed into the middle valve body assembly by the bottom plug.

4. A three-way piston valve suitable for high-pressure turbid circulating water according to claim 3, characterized in that: The valve cover has four central slots for medium flow at the bottom ring, and the valve cover has a special-shaped sealing gasket and a sealing cap for pressing the special-shaped sealing gasket; the bottom of the special-shaped sealing gasket has a spring, which works with the sealing cap to axially compress the special-shaped sealing gasket to compensate for wear gaps.

5. A three-way piston valve suitable for high-pressure turbid circulating water according to claim 1, characterized in that: The inner wall of the middle valve seat is provided with a buffer groove for capturing solid particles; the axial clearance between the two middle valve seats is less than the axial thickness of the bottom sealing part of the regulating valve stem assembly, which is used to radially limit the regulating valve stem assembly.

6. A three-way piston valve suitable for high-pressure turbid circulating water according to claim 4, characterized in that: The irregular-shaped sealing gaskets are provided in three sets and are stacked. The grooves of the three sets of irregular-shaped sealing gaskets are filled with grease for lubricating the regulating valve stem assembly.

7. A three-way piston valve suitable for high-pressure turbid circulating water according to claim 4, characterized in that: The upper valve assembly also includes a pneumatic frame, a diaphragm, and a diaphragm cover connected to the valve cover; the regulating valve stem assembly includes a diaphragm baffle that contacts the diaphragm, and a large spring for driving the regulating valve stem to return to its original position is provided between the diaphragm baffle and the valve cover.

8. A three-way piston valve suitable for high-pressure turbid circulating water according to claim 1, characterized in that: It also includes a lower valve body component assembly installed at the bottom of the middle valve body component assembly, and a lower adjusting rod component assembly linked to the regulating valve stem component assembly; the lower valve body component assembly is provided with a lower cavity for accommodating the leaking liquid, and the lower adjusting rod component assembly is disposed in the lower cavity.

9. A three-way piston valve suitable for high-pressure turbid circulating water according to claim 8, characterized in that: The lower valve body assembly includes a lower valve housing 1 and a lower valve housing 2 connected to each other, with a transparent viewing window tube provided between the lower valve housing 1 and the lower valve housing 2; a reflective ring that can slide along the axial direction of the lower valve housing 1 is provided in the lower cavity.

10. A three-way piston valve suitable for high-pressure turbid circulating water according to claim 9, characterized in that: A monitoring spring is connected between the reflective ring and the lower valve housing, which is used to reset the reflective ring under pressure when the pressure in the lower cavity increases, so that the reflective ring can be displaced within the viewing window tube.

11. A three-way piston valve suitable for high-pressure turbid circulating water according to claim 8, characterized in that: The lowering rod assembly includes a lowering rod connected to the regulating valve rod, and the lowering rod has a lower cover and an adjusting cylinder at its end; the lower cover has a silicone ring for blocking the outward leakage path of the lower valve body assembly under normal conditions.

12. A three-way piston valve suitable for high-pressure turbid circulating water according to claim 11, characterized in that: The adjusting cylinder is provided with a slot; under normal conditions, the slot is connected to the inlet of the lower cavity to introduce the leakage liquid; in the reverse state, the adjusting cylinder moves down with the lower adjusting rod and uses the cylinder body to seal the inlet of the lower cavity, while the lower cover opens the channel for the fluid to be discharged outward.

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