Pressure reducing valve

Abstract

The utility model belongs to the technical field of valves, and discloses a pressure reducing valve. The pressure reducing valve comprises a valve body, a valve element frame and a valve clack, the valve element frame is arranged in the valve body, the valve clack is arranged in the valve element frame in a sliding mode, a water passing hole is formed in the side face of the valve element frame, and a water outlet hole communicated with the water passing hole is formed in the bottom of the valve element frame. The connecting section penetrates through the water outlet hole, an annular gap allowing fluid to pass through is formed between the connecting section and the hole wall of the water outlet hole, the hole diameter of the water outlet hole is defined as E, the diameter of the connecting section is defined as D, and D / E is larger than or equal to 0.75 and smaller than or equal to 0.85. By increasing the diameter D of the connecting section, D / E is kept within the specific range of 0.75-0.85, the flow can be effectively improved on the contrary, and the pressure drop change rate of a flow pressure characteristic curve is more stable.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a pressure reducing valve. Background Technology

[0002] The operation of a piston-type pressure reducing valve is controlled by the downstream pressure. When the downstream pressure increases, the valve opening decreases; when the downstream pressure decreases, the valve opening increases to meet the control requirements.

[0003] Existing pressure reducing valves typically include a valve body, a valve core frame fixed within the valve body, and a valve disc disposed within the valve core frame and moving up and down relative to the valve core frame to change the medium passage and medium flow rate. A water passage hole is opened on the side of the valve core frame, and a water outlet hole communicating with the water passage hole is opened at the bottom of the valve core frame. The valve disc includes a connecting section, which passes through the water outlet hole and forms an annular gap between the connecting section and the wall of the water outlet hole to allow fluid to pass through. Water flows in from the water passage hole on the periphery of the valve core frame and then flows out from the gap between the connecting section and the wall of the water outlet hole.

[0004] It is generally believed in the industry that the smaller the diameter of the connecting section, that is, the larger the gap between the connecting section and the wall of the outlet hole, the greater the flow rate of the pressure reducing valve. However, in actual testing, the inventors found that a smaller connecting section diameter does not necessarily mean a larger flow rate. On the contrary, through multiple experiments, the inventors discovered that within a certain range, increasing the diameter of the connecting section can effectively increase the flow rate, and the pressure drop rate of the flow-pressure characteristic curve remains stable. Utility Model Content

[0005] The purpose of this utility model is to provide a pressure reducing valve that increases the diameter of the connecting section, so that the diameter of the connecting section and the diameter of the outlet hole are kept within a certain range, the flow rate can be effectively increased, and the pressure drop change rate of the flow-pressure characteristic curve is more stable.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A pressure reducing valve includes a valve body, a valve core frame, and a valve disc. The valve core frame is disposed within the valve body, and the valve disc is slidably disposed within the valve core frame. A water passage hole is formed on the side of the valve core frame, and a water outlet hole communicating with the water passage hole is formed at the bottom of the valve core frame. The valve disc includes a connecting section, which passes through the water outlet hole and forms an annular gap between itself and the wall of the water outlet hole to allow fluid to pass through. The diameter of the water outlet hole is defined as E, and the diameter of the connecting section is defined as D. The ratio of D / E is greater than or equal to 0.75 and less than or equal to 0.85.

[0008] As an alternative, the D / E ratio is greater than or equal to 0.8 and less than or equal to 0.85.

[0009] As an optional option, the D / E ratio is 0.8.

[0010] As an optional solution, the valve disc further includes a first boss and a second boss, the first boss being connected between the second boss and the connecting segment, the diameter of the first boss being larger than the diameter of the connecting segment and smaller than the diameter of the second boss, the step surface between the first boss and the second boss being the downstream pressure surface, and the step surface between the first boss and the connecting segment being the upstream pressure surface.

[0011] As an optional solution, the inner sidewall of the valve core frame is provided with a first step, and the pressure action surface after the valve can abut against the first step.

[0012] As an optional solution, the valve core frame is provided with a plurality of water guide holes extending along its axial direction, the upper end of the water guide holes penetrating the step surface of the first step, and the lower end of the water guide holes penetrating the bottom of the valve core frame.

[0013] As an optional solution, a first sealing groove is provided on the outer side wall of the first boss, and a first sealing ring is placed in the first sealing groove, with the outer ring of the first sealing ring abutting against the valve core frame.

[0014] A second sealing groove is provided on the outer side wall of the second boss, and a second sealing ring is placed in the second sealing groove, with the outer ring of the second sealing ring abutting against the inner wall of the valve core frame.

[0015] As an optional solution, the valve disc further includes a retaining ring and a connecting section. The retaining ring is connected to the bottom end of the connecting section, and the connecting section is connected to the bottom end of the retaining ring. The diameter of the connecting section is smaller than the diameter of the retaining ring. A sealing seat is provided at the bottom of the connecting section, and a sealing gasket is provided on the outer sleeve of the connecting section. The sealing gasket is pressed between the retaining ring and the sealing seat.

[0016] As an optional solution, the bottom end of the valve core frame is further provided with a stepped hole and an opening communicating with the water outlet. The stepped hole is arranged around the bottom outer periphery of the water outlet, and the opening is arranged around the bottom outer periphery of the stepped hole. The sealing gasket can abut against the stepped surface at the bottom of the stepped hole. According to the pressure reducing valve of claim 1, the center of the valve disc is provided with an axially penetrating through hole, and a screw is threaded into the through hole. The screw extends out from the bottom of the connecting section and is threadedly connected to the sealing seat.

[0017] The beneficial effects of this utility model are:

[0018] This utility model provides a pressure reducing valve, including a valve body, a valve core frame, and a valve disc. The valve core frame is disposed within the valve body, and the valve disc is slidably disposed within the valve core frame. A water passage hole is opened on the side of the valve core frame, and a water outlet hole communicating with the water passage hole is opened at the bottom of the valve core frame. The valve disc includes a connecting section, which passes through the water outlet hole and forms an annular gap between the connecting section and the wall of the water outlet hole to allow fluid to pass through. Water flows in through the water passage hole on the periphery of the valve core frame and then flows out through the gap between the connecting section and the wall of the water outlet hole. The diameter of the water outlet hole is E, and the diameter of the connecting section is D. By increasing the diameter D of the connecting section, the D / E ratio is kept within the specific range of 0.75-0.85, which effectively increases the flow rate and makes the pressure drop rate of the flow-pressure characteristic curve more stable. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of the pressure reducing valve provided by this utility model with some parts of the structure hidden.

[0020] Figure 2 This is a cross-sectional view of the valve disc and valve core frame provided by this utility model;

[0021] Figure 3 This is a cross-sectional view of the valve disc provided by this utility model;

[0022] Figure 4 This is a cross-sectional view of the valve core frame provided by this utility model;

[0023] Figure 5 This is a schematic diagram of the valve core frame provided by this utility model;

[0024] Figure 6 This is a schematic diagram of the pressure reducing valve provided by this utility model;

[0025] Figure 7 This is a comparison chart of the outlet pressure and flow rate of the pressure reducing valve provided by this utility model.

[0026] In the picture:

[0027] 1. Valve body; 11. Valve chamber; 12. Inlet channel; 13. Outlet channel; 14. Second step;

[0028] 2. Valve core frame; 201. Connecting rib; 21. Water passage hole; 22. Water outlet hole; 23. Step hole; 24. Opening; 25. First step; 26. Water guide hole; 27. Shoulder; 28. Third sealing groove; 29. ​​Third sealing ring;

[0029] 3. Valve disc; 31. Connecting section; 32. First boss; 321. First sealing groove; 322. First sealing ring; 323. Pressure action surface before valve; 33. Retaining ring; 34. Connecting section; 35. Through hole; 36. Second boss; 361. Second sealing groove; 362. Second sealing ring; 363. Pressure action surface after valve; 37. Groove;

[0030] 4. Sealing assembly; 41. Sealing gasket; 42. Sealing seat;

[0031] 5. Screws; 6. Washers; 7. Valve cover; 8. Main spring; 9. Pressure adjusting nut. Detailed Implementation

[0032] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0033] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0035] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0036] like Figure 1 As shown in the figure, this embodiment provides a pressure reducing valve, which includes a valve body 1, a valve core frame 2, and a valve disc 3. The valve body 1 is provided with an inlet channel 12, an outlet channel 13, and a valve cavity 11. The inlet channel 12 and the outlet channel 13 are respectively used to connect to external pipelines. The valve cavity 11 is connected to the inlet channel 12 and the outlet channel 13 respectively. The valve core frame 2 is a cylindrical multi-protrusion sleeve structure and is set in the valve cavity 11 of the valve body 1. The valve disc 3 is slidably set in the valve core frame 2. The side of the valve core frame 2 is provided with multiple rectangular water passage holes 21 (as shown in Figure 5) to allow the upstream medium to pass through. The bottom of the valve core frame 2 is provided with an outlet hole 22 that communicates with the water passage holes 21. The outlet hole 22 is the part with the smallest diameter at the bottom of the valve core frame 2. The valve disc 3 includes a connecting section 31. The connecting section 31 passes through the outlet hole 22 and forms an annular gap between it and the hole wall of the outlet hole 22 to allow fluid to pass through.

[0037] In actual use, the upstream medium flows in through the inlet channel 12, then enters the valve core frame 2 through the water passage 21 on the periphery of the valve core frame 2, then flows out through the gap between the connecting section 31 and the wall of the outlet hole 22, and finally flows downstream through the outlet channel 13.

[0038] Among them, such as Figure 2 As shown, the diameter of the outlet hole 22 is defined as E, and the diameter of the connecting section 31 is defined as D. The ratio D / E is greater than or equal to 0.75 and less than or equal to 0.85. For example, D / E can be 0.75, 0.76, 0.77, 0.78, 0.79, 0.8, 0.81, 0.82, 0.83, 0.84, 0.85, etc. It is generally believed in the industry that the smaller the diameter D of the connecting section 31, that is, the larger the gap between the connecting section 31 and the wall of the outlet hole 22, the greater the flow rate of the pressure reducing valve. However, in actual testing, the inventors found that a smaller diameter of the connecting section 31 does not necessarily mean a larger flow rate; on the contrary, through multiple experiments, the inventors discovered that by increasing the diameter D of the connecting section 31, keeping D / E within the specific range of 0.75-0.85, the flow rate can be effectively increased, and the pressure drop rate of the flow-pressure characteristic curve becomes more stable.

[0039] To address this, the inventor conducted a comparative experiment on the relationship between the orifice diameter E of the outlet 22 and the diameter D of the connecting section 31. Specifically, several pressure-reducing valves within the range of 0.75 ≤ D / E ≤ 0.85 and several pressure-reducing valves with D / E < 0.75 were installed on a pressure test bench. A hydraulic pressure of 0.8 MPa was applied at the inlet, and the adjusting nut 9 of the pressure-reducing valve was slowly adjusted to maintain the outlet pressure at 0.3 MPa. Then, keeping the inlet pressure constant, the upstream control valve was slowly opened, allowing the medium to flow through the pressure-reducing valve. The flow rate was adjusted from 0 to 1.8 m³ / s. 3During the / h process, ten flow rate points were recorded, along with the corresponding outlet pressure values, as shown in Table 1. Each set of data was then fitted into an outlet pressure versus flow rate curve, resulting in the following: Figure 7 The graph shown compares the outlet pressure and flow rate of the pressure reducing valve.

[0040] Table 1

[0041]

[0042]

[0043] Depend on Figure 7 It can be seen that, compared to pressure reducing valves with a D / E ratio < 0.75, pressure reducing valves with a D / E ratio in the range of 0.75-0.85 have a larger flow rate at the same outlet pressure, and the pressure drop rate of the flow-pressure characteristic curve is more stable. This verifies that a smaller diameter of the connecting section 31 does not necessarily mean a larger flow rate. Rather, increasing the diameter D of the connecting section 31 and maintaining the D / E within the specific range of 0.75-0.85 can effectively increase the flow rate, and the pressure drop rate of the flow-pressure characteristic curve remains stable.

[0044] Preferably, by Figure 7 It can be seen that when D / E is greater than or equal to 0.8 and less than or equal to 0.85, the flow rate is relatively large under the same outlet pressure.

[0045] More preferably, such as Figure 7 It can be seen that when D / E is 0.8, the pressure reducing valve has the largest flow rate compared to other comparative examples.

[0046] Furthermore, combined Figure 2 and Figure 3 The valve disc 3 has a cylindrical multi-protrusion structure. Specifically, the valve disc 3 also includes a first protrusion 32 and a second protrusion 36. The first protrusion 32 is connected between the connecting section 31 and the second protrusion 36. The diameter of the first protrusion 32 is larger than the diameter of the connecting section 31 and smaller than the diameter of the second protrusion 36. The stepped surface between the first protrusion 32 and the second protrusion 36 is the downstream pressure application surface 363, and the stepped surface between the first protrusion 32 and the connecting section 31 is the upstream pressure application surface 323. The first protrusion 32 is disposed inside the valve core frame 2 and cooperates with the valve core frame 2 to play a sliding guiding role.

[0047] Furthermore, such as Figures 2 to 4As shown, the inner wall of the valve core frame 2 is provided with a first step 25, and the pressure action surface 363 after the valve can abut against the first step 25. The first step 25 can limit the movement of the valve disc 3. When the valve disc 3 moves downward to the maximum opening, the pressure action surface 363 after the valve abuts against the first step 25, at which point the valve disc 3 reaches the limit position of movement.

[0048] like Figure 2 and Figure 5 As shown, the valve core frame 2 has multiple water guide holes 26 extending axially. The upper end of the water guide hole 26 penetrates the step surface of the first step 25, and the lower end of the water guide hole 26 penetrates the bottom of the valve core frame 2. When the upstream medium enters the valve core frame 2 through the water passage hole 21 on the periphery of the valve core frame 2, the medium force acts upward on the pressure acting surface 323 in front of the valve. Then, the medium flows out from the gap between the connecting section 31 and the wall of the outlet hole 22, and finally flows downstream through the outlet flow channel 13. At this time, the medium enters the water guide hole 26 from the bottom, and the medium force acts upward on the pressure acting surface 363 in back of the valve. In this embodiment, there are four water guide holes 26 and four water passage holes 21. A connecting rib 201 is provided between two adjacent water passage holes 21, and a water guide hole 26 is provided through each connecting rib 201.

[0049] like Figure 2 and Figure 3 As shown, a first sealing groove 321 is provided on the outer side wall of the first boss 32. The first sealing groove 321 contains a first sealing ring 322, and the outer ring of the first sealing ring 322 abuts against the valve core frame 2, thereby improving the sealing performance between the valve disc 3 and the valve core frame 2.

[0050] like Figure 2 and Figure 3 As shown, a second sealing groove 361 is provided on the outer side wall of the second boss 36. The second sealing groove 361 contains a second sealing ring 362, and the outer ring of the second sealing ring 362 abuts against the inner wall of the valve core frame 2, thereby further improving the sealing performance between the valve disc 3 and the valve core frame 2.

[0051] Furthermore, such as Figure 2 and Figure 3As shown, the valve disc 3 also includes a retaining ring 33 and a connecting section 34. The retaining ring 33 is connected to the bottom end of the connecting section 31, and the connecting section 34 is connected to the bottom end of the retaining ring 33. The diameter of the connecting section 31 is smaller than the diameter of the retaining ring 33 but larger than the diameter of the connecting section 34. A sealing assembly 4 capable of sealing and closing the water outlet 22 is provided at the bottom of the connecting section 34. The sealing assembly 4 includes a sealing seat 42 and a sealing gasket 41. The sealing seat 42 is located at the bottom of the connecting section 34, and the sealing gasket 41 is fitted over the connecting section 34 and pressed between the retaining ring 33 and the sealing seat 42. The sealing seat 42 supports the sealing gasket 41, and the retaining ring 33 presses against the sealing gasket 41 to prevent it from tilting up, thereby enabling the sealing gasket 41 to achieve a good sealing effect.

[0052] Furthermore, such as Figure 2 and Figure 4 As shown, the bottom end of the valve core frame 2 is also provided with a stepped hole 23 and an opening 24 that communicate with the water outlet 22. The stepped hole 23 is arranged around the bottom outer periphery of the water outlet 22, and the opening 24 is arranged around the bottom outer periphery of the stepped hole 23. The sealing gasket 41 can abut against the stepped surface at the bottom of the stepped hole 23. Specifically, the diameter of the opening 24 is larger than the diameter of the stepped hole 23, and the diameter of the stepped hole 23 is larger than the diameter of the water outlet 22. The three are connected in sequence to form a three-stage stepped structure. When the pressure reducing valve is closed, the valve disc 3 drives the sealing assembly 4 to move upward, and the sealing gasket 41 abuts against the stepped surface at the bottom of the stepped hole 23 to form a sealing and throttling effect, improving the sealing performance. The opening 24 is set to avoid the sealing seat 42, so that the sealing gasket 41 can smoothly enter the stepped hole 23.

[0053] Furthermore, such as Figure 2 and Figure 3 As shown, the valve disc 3 has a through hole 35 extending axially through its center. A screw 5 is threaded into the through hole 35, extending out from the bottom of the connecting section 34 and threadedly connected to the sealing seat 42. This design allows the valve disc 3 to be made of plastic, reducing costs, minimizing scaling and wear, and extending service life. The screw 5 is made of metal, ensuring the connection strength between it and the sealing seat 42.

[0054] like Figure 2 As shown, a groove 37 is provided at the center of the top of the valve disc 3, and a gasket 6 is provided at the bottom of the groove 37. The head of the screw 5 is pressed against the gasket 6 to prevent the screw 5 from crushing the valve disc 3. The head of the screw 5 has an internal hexagonal hole for tightening.

[0055] like Figure 1 and Figure 4As shown, the outer periphery of the valve core holder 2 is provided with a shoulder 27, and the inner wall of the valve body 1 is provided with a second step 14. The outer wall of the shoulder 27 is threadedly connected to the inner wall of the valve body 1, and the bottom surface of the shoulder 27 can abut against the second step 14. This arrangement makes the valve core holder 2 securely connected to the valve body 1, and facilitates disassembly and assembly. Furthermore, the second step 14 can position the valve core holder 2 in place. When the bottom surface of the shoulder 27 abuts against the second step 14, it indicates that the valve core holder 2 is installed in place.

[0056] Furthermore, a third sealing groove 28 is provided on the outer side wall of the valve core frame 2, and a third sealing ring 29 is placed in the third sealing groove 28. The outer ring of the third sealing ring 29 abuts against the inner wall of the valve body 1, thereby improving the sealing performance between the valve core frame 2 and the valve body 1 frame.

[0057] Combination Figure 1 and Figure 6 The pressure reducing valve provided in this embodiment also includes a valve cover 7, a main spring 8, and a pressure adjusting nut 9. The valve cover 7 is threaded to the upper end of the valve body 1, thereby forming a closed valve chamber 11. The pressure adjusting nut 9 is threaded to the top of the valve cover 7. One end of the main spring 8 abuts against the pressure adjusting nut 9, and the other end extends into the groove 37 at the top of the valve disc 3 and abuts against the gasket 6. The elastic force of the main spring 8 acts downward on the valve disc 3. By turning the pressure adjusting nut 9, the height of the main spring 8 can be changed, thereby adjusting the outlet pressure.

[0058] The working principle of the pressure reducing valve provided in this embodiment is as follows:

[0059] When the upstream medium flows in through the inlet channel 12, it enters the valve core frame 2 through the water passage 21 on the periphery of the valve core frame 2. At this time, the medium acts on the pressure surface 323 in front of the valve, generating an upward force. Then, the medium flows out through the gap between the connecting section 31 and the wall of the outlet hole 22, and finally flows to the downstream through the outlet channel 13. At this time, the medium enters the guide hole 26 from the bottom, and acts on the pressure surface 363 in back of the valve, generating an upward force. When the outlet pressure increases and reaches the set value, the pressure of the medium acting on the pressure surface 323 in front of the valve remains unchanged, while the pressure acting on the pressure surface 363 in back of the valve increases. At this time, the sum of the pressure of the medium acting on the pressure surface 323 in front of the valve and the pressure acting on the pressure surface 363 in back of the valve is greater than the downward force of the main spring 8, thereby overcoming the downward force of the main spring 8 and causing the valve disc 3 to move upward, reducing the valve opening, increasing the flow velocity, increasing the pressure drop, and reducing the downstream pressure of the valve. If the outlet pressure decreases, the pressure of the medium acting on the pressure surface 323 before the valve remains unchanged, while the pressure acting on the pressure surface 363 after the valve decreases. At this time, the sum of the pressure acting on the pressure surface 323 before the valve and the pressure acting on the pressure surface 363 after the valve is less than the downward force of the main spring 8, causing the valve disc 3 to move downward, increasing the valve opening, decreasing the flow velocity, decreasing the pressure drop, and increasing the pressure downstream of the valve, thereby keeping the outlet pressure of the valve body 1 constant.

[0060] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A pressure reducing valve, characterized in that, The valve includes a valve body (1), a valve core frame (2), and a valve disc (3). The valve core frame (2) is disposed inside the valve body (1), and the valve disc (3) is slidably disposed inside the valve core frame (2). A water passage hole (21) is opened on the side of the valve core frame (2), and a water outlet hole (22) communicating with the water passage hole (21) is opened at the bottom of the valve core frame (2). The valve disc (3) includes a connecting section (31). The connecting section (31) passes through the water outlet hole (22) and forms an annular gap between it and the hole wall of the water outlet hole (22) for fluid to pass through. The diameter of the water outlet hole (22) is defined as E, and the diameter of the connecting section (31) is defined as D. D / E is greater than or equal to 0.75 and less than or equal to 0.

85.

2. The pressure reducing valve according to claim 1, characterized in that, D / E is greater than or equal to 0.8 and less than or equal to 0.

85.

3. The pressure reducing valve according to claim 2, characterized in that, The D / E ratio is 0.

8.

4. The pressure reducing valve according to claim 1, characterized in that, The valve disc (3) further includes a first boss (32) and a second boss (36). The first boss (32) is connected between the second boss (36) and the connecting section (31). The diameter of the first boss (32) is larger than the diameter of the connecting section (31) and smaller than the diameter of the second boss (36). The step surface between the first boss (32) and the second boss (36) is the valve downstream pressure action surface (363), and the step surface between the first boss (32) and the connecting section (31) is the valve upstream pressure action surface (323).

5. The pressure reducing valve according to claim 4, characterized in that, The inner wall of the valve core frame (2) is provided with a first step (25), and the valve back pressure action surface (363) can abut against the first step (25).

6. The pressure reducing valve according to claim 5, characterized in that, The valve core frame (2) has a plurality of water guide holes (26) extending along its axial direction. The upper end of the water guide hole (26) penetrates the step surface of the first step (25), and the lower end of the water guide hole (26) penetrates the bottom of the valve core frame (2).

7. The pressure reducing valve according to claim 4, characterized in that, A first sealing groove (321) is provided on the outer side wall of the first boss (32), and a first sealing ring (322) is placed in the first sealing groove (321), and the outer ring of the first sealing ring (322) abuts against the valve core frame (2). A second sealing groove (361) is provided on the outer side wall of the second boss (36), and a second sealing ring (362) is placed in the second sealing groove (361), and the outer ring of the second sealing ring (362) abuts against the inner wall of the valve core frame (2).

8. The pressure reducing valve according to claim 1, characterized in that, The valve disc (3) also includes a retaining ring (33) and a connecting section (34). The retaining ring (33) is connected to the bottom end of the connecting section (31), and the connecting section (34) is connected to the bottom end of the retaining ring (33). The diameter of the connecting section (31) is smaller than the diameter of the retaining ring (33). A sealing seat (42) is provided at the bottom of the connecting section (34), and a sealing gasket (41) is provided on the outer sleeve of the connecting section (34). The sealing gasket (41) is pressed between the retaining ring (33) and the sealing seat (42).

9. The pressure reducing valve according to claim 8, characterized in that, The bottom end of the valve core frame (2) is also provided with a stepped hole (23) and an opening (24) that communicate with the water outlet (22). The stepped hole (23) is arranged around the bottom outer periphery of the water outlet (22), and the opening (24) is arranged around the bottom outer periphery of the stepped hole (23). The sealing gasket (41) can abut against the stepped surface at the bottom of the stepped hole (23).

10. The pressure reducing valve according to claim 8, characterized in that, The valve disc (3) has a through hole (35) extending axially through the center. A screw (5) is threaded into the through hole (35). The screw (5) extends out from the bottom of the connecting section (34) and is threaded into the sealing seat (42).

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