A three-way confluence regulating valve assembly and method for achieving efficient flow ratio regulation

Abstract

This invention discloses a three-way confluence regulating valve assembly and its method for achieving efficient flow ratio adjustment, belonging to the field of valves. The valve assembly of this invention consists of two parts: a three-way main valve and a pilot-operated pressure reducing valve. The main valve core of the three-way main valve is designed as a cylindrical shape with a side window, enabling uniform adjustment of the flow ratio between the two inlets through circumferential movement. The upper pilot valve inlet of the pilot-operated pressure reducing valve is connected to the side pressure port of the three-way main valve, allowing the valve stem to move up and down to maintain consistent pressure between the two inlets of the three-way main valve and providing resistance to inlet pressure fluctuations. The entire valve assembly adopts an embedded and threaded fixing method from bottom to top, facilitating disassembly, maintenance, and cleaning.

Description

Technical Field

[0001] This invention belongs to the field of valves, and specifically relates to a three-way confluence regulating valve assembly and its method for achieving efficient flow ratio regulation. Background Technology

[0002] Three-way control valves, as a highly integrated pipeline component, simultaneously combine multiple flow paths and regulate the flow ratio of each path. They are widely used in various fields such as boric acid regulation systems in nuclear power plants, heating systems, and ship engine cooling systems, playing a crucial role in multi-pipeline systems. Unlike general single-inlet / single-outlet valves, three-way control valves often face more complex operating conditions and require higher regulation accuracy and uniformity. Currently, domestically produced three-way control valves frequently exhibit performance failures under the following conditions: large pressure differentials between multiple parallel pipelines; pressure disturbances at the inlet; and the requirement for a lower inlet flow rate in one path during confluence, thus failing to meet production needs. Furthermore, the flow ratio does not exhibit uniform changes during valve core movement, causing significant challenges to parameter calculation and tuning of the automatic control system. The valve body structure of three-way control valves is often quite complex, making disassembly and repair difficult. Summary of the Invention

[0003] To overcome the technical difficulties of the prior art, this invention discloses a three-way merging regulating valve assembly and its method for achieving efficient flow ratio regulation. Its efficiency is reflected in the fact that this three-way merging regulating valve assembly can actively adapt to the pressure difference in the inlet pipeline, achieving uniform and stable flow distribution while counteracting inlet pressure disturbances. Furthermore, the valve assembly has a simple structure, facilitating assembly and disassembly.

[0004] The specific technical solution adopted in this invention is as follows:

[0005] In a first aspect, the present invention provides a three-way confluence regulating valve assembly for achieving efficient flow ratio regulation, comprising a three-way main valve, a pilot-operated pressure reducing valve, and a pressure inlet assembly; the three-way main valve has a first inlet and a second inlet respectively opened on its side wall, the first inlet being used to introduce low-pressure fluid, and the second inlet being connected to the second outlet of the pilot-operated pressure reducing valve; one side opening of the pressure inlet assembly is connected to the first inlet, and the other side opening is connected to the pilot valve inlet at the top of the pilot-operated pressure reducing valve through a pipeline;

[0006] The three-way main valve includes a three-way valve cover, a three-way valve body, a three-way valve stem, a main valve core, an inner sleeve, and a main valve seat. The three-way valve cover is fixed to the top of the three-way valve body, and the main valve seat is fixed to the first outlet at the bottom. The main valve core is placed on the main valve seat, with its side wall sealed and rotatably connected to the inner wall of the three-way valve body, and the top is keyed to the three-way valve stem. The upper part of the three-way valve stem passes through the three-way valve cover, and the two are sealed and rotatably connected. A first window and a second window are respectively opened on the outer wall of the main valve core. The first window is located inside the first inlet, and the second window is located inside the second inlet. By rotating the main valve core through the three-way valve stem, the flow area of ​​the first and second windows can be adjusted, thereby changing the flow ratio of the fluid entering the three-way main valve through the first and second inlets. The main valve core... An internal flow guide cavity is provided at the rear. The first and second windows are connected to the flow guide cavity through the second pressure relief port, and the top of the flow guide cavity is connected to the upper part of the valve cavity of the three-way valve body through the first pressure relief port. An inner sleeve is provided coaxially within the main valve core. The top of the inner sleeve is sealed with a plug, and the bottom is fixed to the main valve seat and connected to the first outlet of the three-way main valve. The inner sleeve does not rotate with the main valve core. A spiral guide plate is provided axially on the outer periphery of the upper part of the inner sleeve. Several third pressure relief ports are provided on the side wall of the inner sleeve located at the spiral guide plate. The spiral guide plate can completely cover the gap between the main valve core and the inner sleeve at its location, so that the fluid in the upper part of the valve cavity of the three-way valve body is stabilized by the spiral guide plate, enters the hollow cavity of the inner sleeve through the third pressure relief port, and flows out from the first outlet of the three-way main valve.

[0007] The pilot-operated pressure reducing valve includes a pressure reducing valve cover, an upper valve body, a lower valve body, an adjusting rod, a pressure reducing valve stem, an upper valve seat, a lower valve seat, and a pressure reducing valve core. The pressure reducing valve cover is fixed to the top of the upper valve body, and an upper isolation plate is clamped and fixed at the connection between the two. The upper valve body has a pilot valve inlet on its side wall, and its bottom is fixedly connected to the lower valve body. The lower part of the valve cavity is sealed and fixedly fitted with an upper valve seat. A lower isolation plate with a pressure relief hole is clamped and fixed at the connection between the upper and lower valve bodies, and a lower valve seat is provided in the middle of the valve cavity of the lower valve body. The pressure reducing valve cover contains a first spring that can provide vertical elastic force. The upper end of the first spring is connected to the bottom of the adjusting rod through a clamping member, and the lower end is connected to the top of the pressure reducing valve stem through a force-bearing plate. The adjusting rod... The upper part penetrates the pressure reducing valve cover and is located outside the pilot-operated pressure reducing valve; the pressure reducing valve stem passes through the upper and lower isolation plates from top to bottom, and the bottom is provided with a pressure reducing valve core that can control the opening and closing of the lower valve seat by moving up and down; a third inlet for introducing high-pressure fluid is opened on one side of the lower valve body, and a second outlet is opened on the other side and communicates with the second inlet. The opening and closing of the flow channel between the third inlet and the second outlet can be controlled by the pressure reducing valve core; a balance plate is fixed on the outer periphery of the pressure reducing valve stem located in the inner cavity of the upper valve seat; the balance plate can completely cover the annular space between the upper valve seat and the pressure reducing valve stem, dividing the inner cavity of the upper valve body into an upper chamber and a lower chamber that are not interconnected, and the balance plate can slide up and down along the inner wall of the upper valve seat.

[0008] Preferably, the sealing element is a hexagonal spiral plug, and the top of the inner sleeve is provided with an internal thread. The sealing element is connected to the inner sleeve thread through the internal thread.

[0009] Preferably, the main valve core has an axially formed first inner cavity for installing the inner sleeve, and a plurality of wedge-shaped limiting grooves are formed on the main valve core along the outer periphery of the top of the first inner cavity. The bottom of the three-way valve stem has a plurality of protrusions that can be embedded and cooperate with the limiting grooves, so that the three-way valve stem is keyed to the main valve core.

[0010] Preferably, the adjusting rod is threadedly connected to the pressure reducing valve cover, and can move up and down by circumferential rotation; a clamping member is fixed at the bottom of the adjusting rod, and the clamping member is pressed against the upper end of the first spring.

[0011] Preferably, the pressure port assembly includes a first housing and a second housing; the first housing is a cubic structure with an inner cavity, a threaded hole is provided on one outer wall, the threaded hole is fixed to the outside of the three-way main valve through the threaded hole, and a third window is provided on the other outer wall, which communicates with the hollow inner cavity, and the third window is connected to the first inlet through a pipeline; the second housing is a cylindrical structure, fixed to the top of the first housing, the bottom is connected to the inner cavity of the first housing through a connecting port, and the top pressure port is connected to the pilot valve inlet at the top of the pilot-operated pressure reducing valve through a pipeline; the flow cross-sectional area of ​​the connecting port is smaller than the flow cross-sectional area of ​​the inner cavity of the first housing.

[0012] Preferably, the inner sleeve has several positioning grooves circumferentially opened at the bottom, and the main valve seat has several protrusions at the top that can be embedded and cooperate with the positioning grooves, so that the inner sleeve is keyed to the main valve seat.

[0013] Preferably, the top of the pressure reducing valve core is threaded to the bottom of the pressure reducing valve stem, and a second spring that can provide vertical elastic force is fixed at the bottom; the bottom of the pressure reducing valve core and the second spring are placed together in the groove at the bottom of the lower valve seat, so that the pressure reducing valve core can only move up and down along the axial direction.

[0014] Preferably, the inner wall of the upper valve seat is provided with a third sealing ring, and the balance plate can slide vertically up and down along the third sealing ring; the connection between the three-way valve stem and the three-way valve cover is provided with a fourth sealing ring, and the three-way valve stem can rotate circumferentially along the fourth sealing ring; the upper and lower parts of the outer wall of the main valve core are respectively provided with a first sealing ring and a second sealing ring for sealing with the inner wall of the three-way valve body.

[0015] Preferably, the upper valve seat is located below the inlet of the pilot valve.

[0016] Secondly, the present invention provides a flow regulation method for a three-way confluence regulating valve assembly that utilizes any of the methods described in the first aspect to achieve efficient flow ratio regulation, as follows:

[0017] Rotating the three-way valve stem changes the position of the first and second windows, adjusting the flow area of ​​the two windows to alter the flow ratio between the first and second inlets. The fluid from the first and second inlets, after being throttled through their respective windows, enters the guide chamber behind the main valve core via the second pressure relief port. It then enters the upper region of the three-way valve body cavity through the first pressure relief port, where it mixes thoroughly. Under gravity, it passes through the gap between the three-way valve stem and the main valve core, entering the interior of the main valve core and flowing downwards along the spiral guide plate. The spiral guide plate stabilizes the fluid flow, reduces turbulence, and removes any impurities through centrifugal force. The fluid then enters the hollow interior of the inner sleeve through the third pressure relief port, flowing downwards and finally exiting from the first outlet of the three-way main valve.

[0018] Since one side opening of the pressure tap assembly is connected to the first inlet, during this process, low-pressure fluid enters the upper chamber of the upper valve body of the pilot-operated pressure reducing valve from the pilot valve inlet through the pressure tap assembly; at the same time, high-pressure fluid entering from the third inlet of the pilot-operated pressure reducing valve enters the lower chamber of the upper valve body through the pressure relief hole of the lower isolation plate.

[0019] When the static pressure inside the first inlet of the low-pressure fluid increases, the pressure in the upper chamber of the pilot-operated pressure reducing valve rises because the static pressure in the upper chamber is equal to the pressure inside the first inlet. At this time, the pressure on the upper surface of the balance plate increases, and the balance plate drives the pressure reducing valve rod to move downward. The pressure reducing valve rod drives the pressure reducing valve core at the bottom to move downward, which increases the opening of the lower valve seat. The flow area between the pressure reducing valve core and the lower valve seat increases, the flow resistance coefficient decreases, and the pressure drop between the third inlet and the second outlet of the pilot-operated pressure reducing valve decreases. This causes the pressure of the high-pressure fluid entering the three-way main valve through the second outlet to also increase. The pressures at the first inlet and the second inlet of the three-way main valve remain consistent.

[0020] When the static pressure inside the first inlet of the low-pressure fluid decreases, the pressure in the upper chamber decreases, the pressure on the upper surface of the balance plate decreases, the balance plate drives the pressure reducing valve stem to move upward, and the pressure reducing valve stem drives the pressure reducing valve core at the bottom to move upward, thus reducing the opening of the lower valve seat; the flow area between the pressure reducing valve core and the lower valve seat decreases, the flow resistance coefficient increases, and the pressure drop between the third inlet and the second outlet of the pilot-operated pressure reducing valve increases, so that the pressure of the high-pressure fluid entering the three-way main valve through the second outlet also decreases, and the pressures at the first inlet and the second inlet of the three-way main valve remain consistent;

[0021] When the internal pressure of the third inlet of the high-pressure fluid increases, the pressure in the lower chamber of the pilot-operated pressure reducing valve rises because the static pressure in the lower chamber is equal to the internal pressure of the third inlet. At this time, the pressure on the lower surface of the balance plate increases, the balance plate drives the pressure reducing valve rod to move upward, and the pressure reducing valve rod drives the pressure reducing valve core at the bottom to move upward, so that the opening of the lower valve seat decreases. The flow area between the pressure reducing valve core and the lower valve seat decreases, the flow resistance coefficient increases, and the pressure drop between the third inlet and the second outlet of the pilot-operated pressure reducing valve increases, so that the pressure of the high-pressure fluid entering the three-way main valve through the second outlet remains unchanged.

[0022] When the internal pressure of the third inlet of the high-pressure fluid decreases, the pressure in the lower chamber decreases, the pressure on the lower surface of the balance plate decreases, the balance plate drives the pressure reducing valve stem to move downward, and the pressure reducing valve stem drives the pressure reducing valve core at the bottom to move downward, which increases the opening of the lower valve seat; the flow area between the pressure reducing valve core and the lower valve seat increases, the flow resistance coefficient decreases, and the pressure drop between the third inlet and the second outlet of the pilot-operated pressure reducing valve decreases, so that the pressure of the high-pressure fluid entering the three-way main valve through the second outlet remains unchanged.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] 1. Conventional merging three-way regulating valves suffer from performance failures such as a small regulating range and backflow in the low-pressure inlet pipe when the pressures in the two inlet pipes are unequal. To overcome these problems, the three-way merging regulating valve assembly proposed in this invention uses an integrated pilot pressure reducing valve to balance the high-pressure inlet pressure. Furthermore, the three-way main valve has a symmetrical oblique longitudinal section to ensure equal inlet pressures on both sides, achieving stable flow distribution and regulation.

[0025] 2. Pressure fluctuations in the inlet pipeline cause fluctuations in the flow ratio of the three-way regulating valve. The pilot pressure reducing valve in this invention can compensate for pressure changes at either inlet, thereby maintaining a constant flow ratio.

[0026] 3. The three-way main valve in this invention is designed as a cylindrical shape, and the valve core moves in a circumferential direction. This design allows for more uniform flow distribution and reduces the unbalanced torque on the valve core to a certain extent, thus reducing the possibility of jamming.

[0027] 4. The fluid from the two inlets is fully mixed in the upper area of ​​the three-way main valve and reaches the outlet pipe through the central spiral flow channel, stabilizing the fluid flow and removing impurities, thereby ensuring the uniformity and stability of the fluid at the outlet of the three-way main valve.

[0028] 5. The valve assembly proposed in this invention adopts an embedded and threaded fixing method from bottom to top, which facilitates disassembly, maintenance and cleaning. Attached Figure Description

[0029] Figure 1A three-dimensional view of a three-way confluence regulating valve assembly;

[0030] Figure 2 A three-dimensional sectional view of a three-way confluence regulating valve assembly;

[0031] Figure 3 A three-dimensional perspective view (a) and a sectional view (b) of the main valve core;

[0032] Figure 4 The three-dimensional view (a) and sectional view (b) of the inner sleeve are shown.

[0033] Figure 5 A three-dimensional perspective view (a) and a cross-sectional view (b) of the pressure inlet assembly;

[0034] Figure 6 A cross-sectional view showing the connection between the pressure inlet assembly and the three-way main valve;

[0035] Figure 7 This is a plan view of a three-way main valve.

[0036] In the diagram: 1. Three-way valve stem; 2. Three-way valve cover; 3. Sealing component; 4. Inner sleeve; 401. Spiral guide plate; 402. Positioning groove; 403. Internal thread; 404. Third pressure relief port; 5. Main valve core; 501. First pressure relief port; 5021. First window; 5022. Second window; 503. Limiting groove; 504. Second pressure relief port; 505. First inner cavity; 6. Three-way valve body; 7. Adjusting rod; 8. Pressure reducing valve cover; 9. Clamping component; 10. First spring; 11. 12. Upper isolation plate; 13. Upper valve body; 14. Upper valve seat; 15. Balance plate; 16. Lower isolation plate; 17. Lower valve body; 18. Pressure reducing valve stem; 19. Pressure reducing valve core; 20. Second spring; 21. Lower valve seat; 22. Fixing component; 23. Pressure inlet assembly; 231. Third window; 232. Threaded hole; 233. Connecting port; 241. First sealing ring; 242. Second sealing ring; 243. Third sealing ring; 244. Fourth sealing ring; 25. Main valve seat. Detailed Implementation

[0037] The present invention will be further described and illustrated below with reference to the accompanying drawings and specific embodiments. The technical features of each embodiment of the present invention can be combined accordingly, provided that there is no mutual conflict.

[0038] like Figure 1 and 2As shown, this invention provides a three-way confluence regulating valve assembly for achieving efficient flow ratio adjustment. The assembly mainly includes a three-way main valve, a pilot-operated pressure reducing valve, and a pressure port assembly 23. The three-way main valve has a first inlet and a second inlet on its side wall, with a fluid outlet below. The first inlet is used to introduce low-pressure fluid, and the second inlet is connected to the second outlet of the pilot-operated pressure reducing valve. One side of the pressure port assembly 23 is connected to the first inlet, and the other side is connected via a pipeline to the pilot valve inlet at the top of the pilot-operated pressure reducing valve. The main valve of the pilot-operated pressure reducing valve has a third inlet for introducing high-pressure fluid, and a second outlet is located on the other side of the main valve.

[0039] In actual construction, such as Figure 1 As shown, first assess the internal pressure of the two pipelines that need to merge, and then vertically place the three-way valve body 6 into the process piping system. One side inlet flange of the three-way valve body 6 is connected to the outlet of the low-pressure pipeline, and the other side inlet is bolted to the outlet of the lower valve body 17. The lower outlet flange is connected to the inlet of the pipeline to which the flow needs to be merged.

[0040] The structure and connection method of each component will be explained in detail below.

[0041] In the three-way confluence regulating valve assembly of the present invention, such as Figure 7 As shown, the three-way main valve mainly includes a three-way valve cover 2, a three-way valve body 6, a three-way valve stem 1, a main valve core 5, an inner sleeve 4, and a main valve seat 25. The three-way valve cover 2 is fixed to the top of the three-way valve body 6, and the main valve seat 25 is fixed to the first outlet at the bottom. The valve seat 25 and the three-way valve body 6 can be fixed in an embedded fit. In this embodiment, the three-way valve body 6 and the three-way valve cover 2 are connected by bolts. The main valve core 5 is placed on the main valve seat 25, and its side wall is sealed to the inner wall of the three-way valve body 6. The main valve core 5 can rotate circumferentially along the inner wall of the three-way valve body 6. In this embodiment, to ensure the sealing between the main valve core 5 and the inner wall of the three-way valve body 6, a first sealing ring 241 and a second sealing ring 242 for sealing with the inner wall of the three-way valve body 6 can be respectively provided on the upper and lower parts of the outer wall of the main valve core 5. The top of the main valve core 5 is keyed to the three-way valve stem 1, meaning that the main valve core 5 can rotate circumferentially with the three-way valve stem 1. In this embodiment, the main valve core 5 has an axially formed first inner cavity 505 for installing the inner sleeve 4. Several wedge-shaped limiting grooves 503 are formed on the main valve core 5 along the outer periphery of the top of the first inner cavity 505. Several protrusions are circumferentially formed at the bottom of the three-way valve stem 1, which can be embedded and cooperate with the limiting grooves 503, thus keying the three-way valve stem 1 to the main valve core 5. The upper part of the three-way valve stem 1 passes through the three-way valve cover 2, and the two are rotatably connected in a sealed manner. In this embodiment, to ensure the sealing between the three-way valve stem 1 and the three-way valve cover 2, a fourth sealing ring 244 can be provided at the connection point, allowing the three-way valve stem 1 to rotate circumferentially along the fourth sealing ring 244.

[0042] In the three-way confluence regulating valve assembly of the present invention, such as Figure 3 As shown, a first window 5021 and a second window 5022 are respectively opened on the outer wall of the main valve core 5. The first window 5021 is located inside the first inlet, and the second window 5022 is located inside the second inlet. By rotating the main valve core 5 through the three-way valve stem 1, the flow area of ​​the first window 5021 and the second window 5022 can be adjusted, thereby changing the flow ratio of the fluid entering the three-way main valve through the first inlet and the second inlet. In practical applications, the shape, size, and angle of the first window 5021 and the second window 5022 can be further adjusted according to the actual flow distribution needs. A flow guide cavity is opened behind the main valve core 5, and the flow guide cavity is located inside the main valve core 5. The first window 5021 and the second window 5022 are respectively connected to the flow guide cavity through the second pressure relief port 504, and the top of the flow guide cavity is connected to the upper part of the valve cavity of the three-way valve body 6 through the first pressure relief port 501.

[0043] In the three-way confluence regulating valve assembly of the present invention, an inner sleeve 4 is coaxially spaced inside the main valve core 5. The top of the inner sleeve 4 is sealed with a sealing element 3, and the bottom is fixed to the main valve seat 25 and communicates with the first outlet of the three-way main valve. The inner sleeve 4 does not rotate with the main valve core 5. That is to say, the inner sleeve 4 is placed inside the main valve core 5 and on the upper part of the main valve seat 25, and the inner sleeve 4 and the main valve seat 25 are embedded and fixed.

[0044] In this embodiment, the sealing element 3 can be a hexagonal spiral plug, and the top of the inner sleeve 4 is provided with an internal thread 403. The sealing element 3 is threadedly sealed to the inner sleeve 4 through the internal thread 403. The bottom of the inner sleeve 4 is provided with multiple positioning grooves 402, and the top of the main valve seat 25 is provided with multiple protrusions. The protrusions can be embedded and engaged with the positioning grooves 402, so that the inner sleeve 4 and the main valve seat 25 are keyed together.

[0045] In the three-way confluence regulating valve assembly of the present invention, such as Figure 4 As shown, a spiral guide plate 401 is axially provided on the outer periphery of the upper part of the inner sleeve 4, and multiple third pressure relief ports 404 are provided on the side wall of the inner sleeve 4 located at the spiral guide plate 401. The spiral guide plate 401 can completely cover the gap between the main valve core 5 and the inner sleeve 4, so that the fluid in the upper part of the valve cavity of the three-way valve body 6 is stabilized by the spiral guide plate 401, and then enters the hollow cavity of the inner sleeve 4 through the third pressure relief ports 404, and flows out from the first outlet of the three-way main valve.

[0046] In practical applications, it is preferable to arrange the three-way valve stem 1, the main valve core 5, and the inner sleeve 4 coaxially.

[0047] In actual construction, such as Figure 2 and Figure 7As shown, the main valve seat 25 is placed at the bottom of the three-way valve body 6. The positioning boss at the bottom of the three-way valve body 6 is embedded in the positioning groove of the main valve seat 25 to prevent the main valve seat 25 from moving circumferentially. The first sealing ring 241 and the second sealing ring 242 are installed on the upper and lower parts of the main valve core 5, respectively. The main valve core 5 is then placed inside the three-way valve body 6. The main valve core 5, the three-way valve body 6, and the main valve seat 25 are in a clearance fit. The first sealing ring 241 and the second sealing ring 242 are tightly fitted with the three-way valve body 6 and the main valve core 5 to ensure the valve's sealing performance. The inner sleeve 4 is placed in the center inside the main valve core 5 and installed on the main valve seat 25. The positioning groove 402 of the inner sleeve is aligned with and embedded in the positioning boss of the main valve seat 25 to prevent the inner sleeve 4 from moving circumferentially. The inner sleeve 4 and the main valve core 5 are in a clearance fit and are lubricated to reduce friction. The lower end of the three-way valve stem 1 is embedded in the groove of the main valve core 5, which can drive the main valve core 5 to move circumferentially. Cover the three-way valve with the cover 2 and use screws to fix the three-way valve cover 2 to the three-way valve body 6.

[0048] In the three-way confluence regulating valve assembly of the present invention, the pilot-operated pressure reducing valve mainly includes a pressure reducing valve cover 8, an upper valve body 13, a lower valve body 17, an adjusting rod 7, a pressure reducing valve stem 18, an upper valve seat 14, a lower valve seat 21, and a pressure reducing valve core 19. The pressure reducing valve cover 8 is fixed to the top of the upper valve body 13, and an upper isolation plate 12 is clamped and fixed at the connection between the two. A pilot valve inlet is opened on the side wall of the upper valve body 13, and the bottom is fixedly connected to the lower valve body 17. The lower part of the valve cavity is sealed and fixedly fitted with an upper valve seat 14. A lower isolation plate 16 with a pressure relief hole is clamped and fixed at the connection between the upper valve body 13 and the lower valve body 17, and a lower valve seat 21 is provided in the middle of the valve cavity of the lower valve body 17. A first spring 10 that can provide vertical elastic force is provided inside the pressure reducing valve cover 8. The first spring 10 has a preload force. The upper end of the first spring 10 is connected to the bottom of the adjusting rod 7 through a clamping member 9, and the lower end is connected to the top of the pressure reducing valve stem 18 through a force-bearing plate 11. The upper part of the adjusting rod 7 passes through the pressure reducing valve cover 8 and is located outside the pilot-operated pressure reducing valve.

[0049] In this embodiment, the pressure reducing valve cover (8) and the upper valve body (13) are fixed together by bolts. The adjusting rod 7 is connected to the pressure reducing valve cover 8 by threads. The adjusting rod 7 can move up and down by circumferential rotation to adjust the initial elastic force of the first spring 10. A clamping member 9 is fixed at the bottom of the adjusting rod 7 and is pressed against the upper end of the first spring 10.

[0050] In the three-way confluence regulating valve assembly of the present invention, the pressure reducing valve stem 18 passes through the upper isolation plate 12 and the lower isolation plate 16 from top to bottom, and the bottom is provided with a pressure reducing valve core 19 that can control the opening and closing of the lower valve seat 21 by moving up and down. The top of the pressure reducing valve stem 18 is located inside the pressure reducing valve cover (8) and is fixedly connected to the force plate 11 by threads. The force plate (11) and the first spring (10) are pressed together. A third inlet for introducing high-pressure fluid is opened on one side of the lower valve body 17, and a second outlet is opened on the other side and communicates with the second inlet. The opening and closing of the flow channel between the third inlet and the second outlet can be controlled by the pressure reducing valve core 19.

[0051] In this embodiment, the top of the pressure reducing valve core 19 is threadedly connected to the bottom of the pressure reducing valve stem 18. A second spring 20, which provides vertical elastic force, is fixed to the bottom of the pressure reducing valve core 19. The second spring 20 has a preload. In the initial state, the top of the pressure reducing valve core 19 blocks the outlet of the lower valve seat upward under the elastic force of the second spring 20, disconnecting the passage between the second outlet and the second inlet. The bottom of the pressure reducing valve core 19, together with the second spring 20, is placed in the groove at the bottom of the lower valve seat 21, so that the pressure reducing valve core 19 can only move up and down axially. The second spring (20) and the pressure reducing valve core (19) are fixed by welding.

[0052] In the three-way confluence regulating valve assembly of the present invention, a balance plate 15 is fixed to the outer periphery of the pressure reducing valve stem 18 located in the inner cavity of the upper valve seat 14. The balance plate 15 can completely cover the annular space between the upper valve seat 14 and the pressure reducing valve stem 18, dividing the inner cavity of the upper valve body 13 into an upper chamber and a lower chamber that are not interconnected. The balance plate 15 can slide up and down along the inner wall of the upper valve seat 14. Specifically, a low-pressure chamber (i.e., the upper chamber) is formed on the upper side of the balance plate (15) in the upper valve body (13), and a high-pressure chamber (i.e., the lower chamber) is formed on the lower side of the balance plate (15) in the upper valve body (13).

[0053] In this embodiment, a third sealing ring 243 is provided on the inner wall of the upper valve seat 14, and the balance plate 15 can slide vertically up and down along the third sealing ring 243. The upper valve seat 14 is located at the step below the pilot valve inlet. The balance plate (15) and the pressure reducing valve stem 18 are fixed by lateral screws.

[0054] In practical applications, it is preferable to arrange the adjusting rod 7, pressure reducing valve cover 8, clamping component 9, first spring 10, force plate 11, upper isolation plate 12, pressure reducing valve rod 18, upper valve seat 14, balance plate 15, lower isolation plate 16, pressure reducing valve core 19, and second spring 20 coaxially.

[0055] In actual construction, such as Figure 2As shown, the inlet end of the lower valve body 17, which is not connected to the three-way valve body 6, is connected to the high-pressure fluid outlet pipeline via a flange. The second spring 20 is placed in the groove of the base of the lower valve body 17 of the pilot-operated pressure reducing valve. The pressure reducing valve core 19 is placed on the second spring 20 and pressed against it, giving the second spring 20 a certain degree of compression. The lower valve seat 21 is placed in the central throttling zone of the lower valve body 17. The lower end of the pressure reducing valve stem 18 is threaded through the lower valve seat 21 and connected to the internal threaded hole of the pressure reducing valve core 19. The lower isolation center hole is passed through the pressure reducing valve stem 18 and placed at the upper opening of the lower valve body 17. The upper valve body 13 is connected to the lower valve body 17 by bolts, and the lower isolation plate 16 is pressed tightly by the bolt preload. The upper valve seat 14 is placed inside the upper valve body 13, and a third sealing ring 243 is tightly installed inside the upper valve seat 14. Install the balance plate 15 onto the middle of the pressure reducing valve stem 18 using side screws. The side of the balance plate 15 should be tightly against the inner sealing layer of the upper valve seat 14, ensuring that the upper and lower areas of the balance plate 15 are independent of each other. Pass the upper isolation plate 12 through the pressure reducing valve stem 18 and place it at the upper opening of the upper valve body 13. Screw the force plate 11 onto the threaded top of the pressure reducing valve stem 18 and secure it. Place the first spring 10 on top of the force plate 11, at its center. Place the clamping member 9 on top of the first spring 10, with its upper ring concentric with the first spring 10. Install the pressure reducing valve cover 8 onto the upper valve body 13 using bolts. Screw the adjusting rod 7 into the threaded hole at the top of the pressure reducing valve cover 8, with the lower end of the adjusting rod 7 abutting against the clamping member 9. Connect the pressure inlet port and the inlet pipe of the upper valve body 13 using a pipeline. Before starting the unit, it is necessary to inject liquid to purge air from the valve to prevent air bubbles from affecting the performance of the three-way regulating valve assembly. The disassembly process is the reverse of the assembly process described above.

[0056] In this embodiment, as Figure 5 and 6 As shown, the pressure port assembly 23 mainly includes a first housing and a second housing. The first housing is a cubic structure with an inner cavity. A threaded hole 232 is provided on one outer wall, through which the threaded hole 232 is fixed to the outside of the three-way main valve. A third window 231, communicating with the hollow inner cavity, is provided on the other outer wall. The third window 231 is connected to the first inlet via a pipe. The second housing is a cylindrical structure, fixed to the top of the first housing. Its bottom is connected to the inner cavity of the first housing via a connecting port 233, and its top pressure port is connected to the pilot valve inlet at the top of the pilot-operated pressure reducing valve via a pipe. The flow cross-sectional area of ​​the connecting port 233 is smaller than the flow cross-sectional area of ​​the inner cavity of the first housing.

[0057] In actual construction, the pressure port assembly 23 is fixed to the hole on the side of the valve body, and one side of the third window 231 is close to the valve body wall. The pressure port assembly 23 and the fixing member 22 are connected by screws, and the fixing member 22 and the valve body are connected by screws.

[0058] Based on the above-mentioned three-way confluence regulating valve assembly for achieving efficient flow ratio adjustment, the present invention also provides a flow regulation method, as follows:

[0059] When the three-way valve stem 1 is rotated, the three-way valve stem 1 only drives the main valve core 5 to move in a circumferential direction. The inner sleeve 4 and the valve seat 25 do not move together with the main valve core 5 due to the presence of the positioning groove below.

[0060] The fluids at the first and second inlets of the three-way main valve enter the valve body through the first window 5021 and the second window 5022. When the three-way valve stem 1 is rotated, the window positions change, the flow area of ​​one inlet decreases, resulting in a decrease in flow rate; the flow area of ​​the other inlet increases, resulting in a increase in flow rate, thus changing the flow ratio between the two inlets. After being throttled through the corresponding windows, the fluids at the first and second inlets enter the guide cavity behind the main valve core 5 through the second pressure relief port 504, and then enter the upper region of the valve cavity of the three-way valve body 6 through the first pressure relief port 501, where they are fully mixed. Then, under the action of gravity, they pass through the gap between the three-way valve stem 1 and the main valve core 5 and enter the interior of the main valve core, flowing downwards along the spiral guide plate 401. The spiral guide plate 401 stabilizes the fluid movement, reduces turbulence, and removes any impurities that may be present by using centrifugal force. Subsequently, the fluid enters the hollow interior of the inner sleeve 4 through the third pressure relief port 404, flowing downwards and finally exiting from the first outlet of the three-way main valve.

[0061] Since one side opening of the pressure tap assembly 23 is connected to the first inlet, during this process, low-pressure fluid enters the upper chamber of the upper valve body 13 of the pilot-operated pressure reducing valve from the pilot valve inlet via the pressure tap assembly 23. At the same time, high-pressure fluid entering from the third inlet of the pilot-operated pressure reducing valve enters the lower chamber of the upper valve body 13 through the pressure relief hole of the lower isolation plate 16.

[0062] When the static pressure inside the first inlet of the low-pressure fluid increases, the pressure in the upper chamber of the pilot-operated pressure reducing valve rises because the static pressure in the upper chamber is equal to the pressure inside the first inlet. At this time, the pressure on the upper surface of the balance plate 15 increases, and the balance plate 15 drives the pressure reducing valve rod 18 to move downward. The pressure reducing valve rod 18 drives the pressure reducing valve core 19 at the bottom to move downward, increasing the opening of the lower valve seat 21. The flow area between the pressure reducing valve core 19 and the lower valve seat 21 increases, the flow resistance coefficient decreases, and the pressure drop between the third inlet and the second outlet of the pilot-operated pressure reducing valve decreases. This causes the pressure of the high-pressure fluid entering the three-way main valve through the second outlet to also increase, while the pressures at the first and second inlets of the three-way main valve remain consistent.

[0063] When the static pressure inside the first inlet of the low-pressure fluid decreases, the pressure in the upper chamber drops, the pressure on the upper surface of the balance plate 15 decreases, and the balance plate 15 drives the pressure reducing valve stem 18 to move upward. The pressure reducing valve stem 18 drives the pressure reducing valve core 19 at the bottom to move upward, causing the opening of the lower valve seat 21 to decrease. The flow area between the pressure reducing valve core 19 and the lower valve seat 21 decreases, the flow resistance coefficient increases, and the pressure drop between the third inlet and the second outlet of the pilot-operated pressure reducing valve increases. This causes the pressure of the high-pressure fluid entering the three-way main valve through the second outlet to also decrease, while the pressures at the first and second inlets of the three-way main valve remain consistent.

[0064] When the internal pressure of the third inlet, through which the high-pressure fluid is introduced, increases, the pressure in the lower chamber rises because the static pressure in the lower chamber of the pilot-operated pressure reducing valve is equal to the internal pressure of the third inlet. At this time, the pressure on the lower surface of the balance plate 15 increases, causing the balance plate 15 to move the pressure reducing valve stem 18 upwards. The pressure reducing valve stem 18 then moves the pressure reducing valve core 19 at the bottom upwards, reducing the opening of the lower valve seat 21. The flow area between the pressure reducing valve core 19 and the lower valve seat 21 decreases, the flow resistance coefficient increases, and the pressure drop between the third inlet and the second outlet of the pilot-operated pressure reducing valve increases, ensuring that the pressure of the high-pressure fluid entering the three-way main valve through the second outlet remains constant.

[0065] When the internal pressure of the third inlet, through which the high-pressure fluid enters, decreases, the pressure in the lower chamber drops, and the pressure on the lower surface of the balance plate 15 decreases. The balance plate 15 then moves the pressure-reducing valve stem 18 downwards, which in turn moves the pressure-reducing valve core 19 at the bottom downwards, increasing the opening of the lower valve seat 21. The flow area between the pressure-reducing valve core 19 and the lower valve seat 21 increases, the flow resistance coefficient decreases, and the pressure drop between the third inlet and the second outlet of the pilot-operated pressure-reducing valve decreases, ensuring that the pressure of the high-pressure fluid entering the three-way main valve through the second outlet remains constant.

[0066] The three-way confluence regulating valve of this invention can uniformly regulate the flow ratio of the two inlets through circumferential movement. The pilot valve inlet at the upper end of the pilot valve is connected to the pressure tap on the side of the three-way main valve. It can keep the pressure of the two inlets of the three-way main valve consistent by pushing the valve stem up and down, and has resistance to inlet pressure fluctuations. The entire valve assembly adopts an embedded and threaded fixing method from bottom to top, which facilitates disassembly, maintenance and cleaning.

[0067] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the invention. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, all technical solutions obtained through equivalent substitution or transformation fall within the protection scope of the present invention.

Claims

1. A three-way confluence regulating valve assembly for achieving efficient flow ratio adjustment, characterized in that, It includes a three-way main valve, a pilot-operated pressure reducing valve, and a pressure port assembly (23); the three-way main valve has a first inlet and a second inlet on its side wall, the first inlet is used to introduce low-pressure fluid, and the second inlet is connected to the second outlet of the pilot-operated pressure reducing valve; one side opening of the pressure port assembly (23) is connected to the first inlet, and the other side opening is connected to the pilot valve inlet at the top of the pilot-operated pressure reducing valve through a pipeline; The three-way main valve includes a three-way valve cover (2), a three-way valve body (6), a three-way valve stem (1), a main valve core (5), an inner sleeve (4), and a main valve seat (25); the three-way valve body (6) has a three-way valve cover (2) fixed at the top and a main valve seat (25) fixed at the first outlet at the bottom; the main valve core (5) is placed on the main valve seat (25), and its side wall is sealed and rotatably connected to the inner wall of the three-way valve body (6), and the top is keyed to the three-way valve stem (1); the upper part of the three-way valve stem (1) passes through the three-way valve cover (2), and the two are connected together. A sealed rotating connection is provided; a first window (5021) and a second window (5022) are respectively opened on the outer wall of the main valve core (5), the first window (5021) is located inside the first inlet, and the second window (5022) is located inside the second inlet; the main valve core (5) is rotated by the three-way valve stem (1), which can adjust the flow area of ​​the first window (5021) and the second window (5022), thereby changing the flow ratio of the fluid entering the three-way main valve through the first inlet and the second inlet; the main valve core (5) An internal flow guide cavity is provided at the rear. The first window (5021) and the second window (5022) are respectively connected to the flow guide cavity through the second pressure relief port (504). The top of the flow guide cavity is connected to the upper part of the valve cavity of the three-way valve body (6) through the first pressure relief port (501). The main valve core (5) is provided with an inner sleeve (4) at an interval on the same axis. The top of the inner sleeve (4) is sealed with a sealing element (3), and the bottom is fixed on the main valve seat (25) and connected to the first outlet of the three-way main valve. The inner sleeve (4) does not rotate with the main valve core (5). A spiral guide plate (401) is provided on the outer circumference of the upper part of the inner sleeve (4). Several third pressure relief ports (404) are provided on the side wall of the inner sleeve (4) located at the spiral guide plate (401). The spiral guide plate (401) can completely cover the gap between the main valve core (5) and the inner sleeve (4), so that the fluid in the upper part of the valve cavity of the three-way valve body (6) is stabilized by the spiral guide plate (401) and enters the hollow cavity of the inner sleeve (4) through the third pressure relief port (404) and flows out from the first outlet of the three-way main valve. The pilot-operated pressure reducing valve includes a pressure reducing valve cover (8), an upper valve body (13), a lower valve body (17), an adjusting rod (7), a pressure reducing valve rod (18), an upper valve seat (14), a lower valve seat (21), and a pressure reducing valve core (19); the pressure reducing valve cover (8) is fixed to the top of the upper valve body (13), and an upper isolation plate (12) is clamped and fixed at the connection between the two; the pilot valve inlet is opened on the side wall of the upper valve body (13), and the bottom is fixedly connected to the lower valve body (17). The lower part of the valve cavity is sealed and fixed with an upper valve seat (14); a lower isolation plate (16) with a pressure relief hole is clamped and fixed at the connection between the upper valve body (13) and the lower valve body (17); a lower valve seat (21) is provided in the middle of the valve cavity of the lower valve body (17); a first spring (10) that can provide vertical elastic force is provided in the pressure reducing valve cover (8); the upper end of the first spring (10) is connected to the bottom of the adjusting rod (7) through a clamping member (9), and the lower end is connected to the pressure reducing valve rod (7) through a force plate (11). The top of the valve is connected to the valve body (18); the upper part of the adjusting rod (7) passes through the pressure reducing valve cover (8) and is located outside the pilot-operated pressure reducing valve; the pressure reducing valve rod (18) passes through the upper isolation plate (12) and the lower isolation plate (16) from top to bottom, and the bottom is provided with a pressure reducing valve core (19) that can control the opening and closing of the lower valve seat (21) by moving up and down; a third inlet for introducing high pressure fluid is opened on one side of the lower valve body (17), and a second outlet is opened on the other side and connected to the second inlet. The opening and closing of the flow channel between the third inlet and the second outlet can be controlled by the pressure reducing valve core (19); a balance plate (15) is fixed on the outer periphery of the pressure reducing valve rod (18) located in the inner cavity of the upper valve seat (14); the balance plate (15) can completely cover the annular space between the upper valve seat (14) and the pressure reducing valve rod (18) at the location, and divide the inner cavity of the upper valve body (13) into an upper chamber and a lower chamber that are not connected to each other. The balance plate (15) can slide up and down along the inner wall of the upper valve seat (14).

2. The three-way confluence regulating valve assembly for achieving efficient flow ratio adjustment according to claim 1, characterized in that, The sealing component (3) is a hexagonal spiral plug, and the top of the inner sleeve (4) is provided with an internal thread (403). The sealing component (3) is connected to the inner sleeve (4) by the internal thread (403) for thread sealing.

3. A three-way confluence regulating valve assembly for achieving efficient flow ratio adjustment according to claim 1, characterized in that, The main valve core (5) has an axially formed first inner cavity (505) for installing the inner sleeve (4). The main valve core (5) has several wedge-shaped limiting grooves (503) along the outer periphery of the top of the first inner cavity (505). The bottom of the three-way valve stem (1) has several protrusions that can be embedded and cooperate with the limiting grooves (503), so that the three-way valve stem (1) is keyed to the main valve core (5).

4. A three-way confluence regulating valve assembly for achieving efficient flow ratio adjustment according to claim 1, characterized in that, The adjusting rod (7) is threadedly connected to the pressure reducing valve cover (8) and can move up and down by circumferential rotation; a clamping part (9) is fixed at the bottom of the adjusting rod (7) and the clamping part (9) is pressed against the upper end of the first spring (10).

5. A three-way confluence regulating valve assembly for achieving efficient flow ratio adjustment according to claim 1, characterized in that, The pressure port assembly (23) includes a first housing and a second housing; the first housing is a cubic structure with an inner cavity, and a threaded hole (232) is provided on one outer wall. The threaded hole (232) is fixed to the outside of the three-way main valve through the threaded hole (232)(22). A third window (231) communicating with the hollow inner cavity is provided on the other outer wall. The third window (231) is connected to the first inlet through a pipeline; the second housing is a cylindrical structure, fixed to the top of the first housing, and the bottom is connected to the inner cavity of the first housing through a connecting port (233). The top pressure port is connected to the pilot valve inlet at the top of the pilot pressure reducing valve through a pipeline; the flow cross-sectional area of ​​the connecting port (233) is smaller than the flow cross-sectional area of ​​the inner cavity of the first housing.

6. A three-way confluence regulating valve assembly for achieving efficient flow ratio adjustment according to claim 1, characterized in that, The inner sleeve (4) has several positioning grooves (402) circumferentially opened at the bottom, and the main valve seat (25) has several protrusions at the top that can be embedded and cooperate with the positioning grooves (402), so that the inner sleeve (4) and the main valve seat (25) are keyed together.

7. A three-way confluence regulating valve assembly for achieving efficient flow ratio adjustment according to claim 1, characterized in that, The top of the pressure reducing valve core (19) is threaded to the bottom of the pressure reducing valve stem (18), and a second spring (20) that can provide vertical elastic force is fixed at the bottom; the bottom of the pressure reducing valve core (19) together with the second spring (20) is placed in the groove at the bottom of the lower valve seat (21), so that the pressure reducing valve core (19) can only move up and down along the axial direction.

8. A three-way confluence regulating valve assembly for achieving efficient flow ratio adjustment according to claim 1, characterized in that, The inner wall of the upper valve seat (14) is provided with a third sealing ring (243), and the balance plate (15) can slide vertically up and down along the third sealing ring (243); the connection between the three-way valve stem (1) and the three-way valve cover (2) is provided with a fourth sealing ring (244), and the three-way valve stem (1) can rotate circumferentially along the fourth sealing ring (244); the upper and lower parts of the outer wall of the main valve core (5) are respectively provided with a first sealing ring (241) and a second sealing ring (242) for sealing with the inner wall of the three-way valve body (6).

9. A three-way confluence regulating valve assembly for achieving efficient flow ratio adjustment according to claim 1, characterized in that, The upper valve seat (14) is located below the inlet of the pilot valve.

10. A flow regulation method for a three-way confluence regulating valve assembly using any one of claims 1 to 9 to achieve efficient flow ratio regulation, characterized in that, Specifically as follows: Rotate the three-way valve stem (1) to change the position of the first window (5021) and the second window (5022), adjust the flow area of ​​the two windows to change the flow ratio of the first inlet and the second inlet; The fluids from the first and second inlets are throttled through their corresponding windows and then enter the guide chamber behind the main valve core (5) through the second pressure relief port (504). They then enter the upper region of the valve chamber of the three-way valve body (6) through the first pressure relief port (501) and are fully mixed there. Under the action of gravity, they pass through the gap between the three-way valve stem (1) and the main valve core (5) and enter the interior of the main valve core, flowing downward along the spiral guide plate (401). The spiral guide plate (401) can stabilize the fluid movement, reduce turbulence, and remove any impurities that may be present by means of centrifugal force. Then, the fluid enters the hollow interior of the inner sleeve (4) through the third pressure relief port (404) and flows downward all the way out from the first outlet of the three-way main valve. Since one side opening of the pressure port assembly (23) is connected to the first inlet, during this process, low-pressure fluid enters the upper chamber of the upper valve body (13) of the pilot-operated pressure reducing valve from the pilot valve inlet through the pressure port assembly (23); at the same time, high-pressure fluid entering from the third inlet of the pilot-operated pressure reducing valve enters the lower chamber of the upper valve body (13) through the pressure relief hole of the lower isolation plate (16); When the static pressure inside the first inlet of the low-pressure fluid increases, the pressure in the upper chamber of the pilot-operated pressure reducing valve rises because the static pressure in the upper chamber of the pilot-operated pressure reducing valve is equal to the pressure inside the first inlet. At this time, the pressure on the upper surface of the balance plate (15) increases, and the balance plate (15) drives the pressure reducing valve rod (18) to move downward. The pressure reducing valve rod (18) drives the pressure reducing valve core (19) at the bottom to move downward, which increases the opening of the lower valve seat (21). The flow area between the pressure reducing valve core (19) and the lower valve seat (21) increases, the flow resistance coefficient decreases, and the pressure drop between the third inlet and the second outlet of the pilot-operated pressure reducing valve decreases, so that the pressure of the high-pressure fluid entering the three-way main valve through the second outlet also increases. The pressures at the first inlet and the second inlet of the three-way main valve remain consistent. When the static pressure inside the first inlet of the low-pressure fluid decreases, the pressure in the upper chamber decreases, the pressure on the upper surface of the balance plate (15) decreases, the balance plate (15) drives the pressure reducing valve rod (18) to move upward, the pressure reducing valve rod (18) drives the pressure reducing valve core (19) at the bottom to move upward, so that the opening of the lower valve seat (21) decreases; the flow area between the pressure reducing valve core (19) and the lower valve seat (21) decreases, the flow resistance coefficient increases, the pressure drop between the third inlet and the second outlet of the pilot-operated pressure reducing valve increases, so that the pressure of the high-pressure fluid entering the three-way main valve through the second outlet also decreases, and the pressure of the first inlet and the second inlet of the three-way main valve remains consistent; When the internal pressure of the third inlet of the high-pressure fluid increases, the pressure in the lower chamber rises because the static pressure in the lower chamber of the pilot-operated pressure reducing valve is equal to the internal pressure of the third inlet. At this time, the pressure on the lower surface of the balance plate (15) increases, and the balance plate (15) drives the pressure reducing valve rod (18) to move upward. The pressure reducing valve rod (18) drives the pressure reducing valve core (19) at the bottom to move upward, so that the opening of the lower valve seat (21) decreases. The flow area between the pressure reducing valve core (19) and the lower valve seat (21) decreases, the flow resistance coefficient increases, and the pressure drop between the third inlet and the second outlet of the pilot-operated pressure reducing valve increases, so that the pressure of the high-pressure fluid entering the three-way main valve through the second outlet remains unchanged. When the internal pressure of the third inlet of the high-pressure fluid decreases, the pressure in the lower chamber decreases, the pressure on the lower surface of the balance plate (15) decreases, the balance plate (15) drives the pressure reducing valve rod (18) to move downward, the pressure reducing valve rod (18) drives the pressure reducing valve core (19) at the bottom to move downward, and the opening of the lower valve seat (21) increases; the flow area between the pressure reducing valve core (19) and the lower valve seat (21) increases, the flow resistance coefficient decreases, the pressure drop between the third inlet and the second outlet of the pilot-operated pressure reducing valve decreases, so that the pressure of the high-pressure fluid entering the three-way main valve through the second outlet remains unchanged.

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