three-way valve

Abstract

This application relates to the field of valve technology, and in particular to a three-way valve. The three-way valve includes a valve body, a valve seat, and a slider; the valve body has a valve cavity, a first valve port, a second valve port, and a third valve port; along the radial direction of the valve cavity, one side of the valve body has a first valve port, and the other side has a second valve port and a third valve port spaced apart; the valve seat is installed in the valve cavity and has a first flow hole communicating with the second valve port, a second flow hole communicating with the third valve port, and a pressure regulating hole; the slider is pressed on top of the valve seat and has a transition cavity and sealing parts located on both sides of the transition cavity along the valve cavity axis; the slider can slide along the valve cavity axis to switch the communication state; during the reversal, it will experience a pressure relief state, at which time one of the first flow hole and the second flow hole can be partially connected to the valve cavity, and the other can be connected to the valve cavity through the transition cavity and the pressure regulating hole to increase the pressure relief amount, and the diameter of the pressure regulating hole is smaller than either the diameter of the first flow hole or the diameter of the second flow hole, so as to control the pressure relief amount to be too large and make the reversal reliable.

Description

Technical Field

[0001] This application relates to the field of valve technology, and in particular to a three-way valve. Background Technology

[0002] In air conditioning systems, the three-way valve is one of the core fluid control components, and its reliability directly affects the stable operation and efficiency of the system. The core function of the three-way valve is to change the flow direction of refrigerant in the main circuit through the movement of an internal slider, thereby achieving the switching between cooling and heating modes.

[0003] In common sliding three-way valve designs, the valve pipe has at least one orifice, and inside the valve pipe are a main valve seat and a movable slider. The main valve seat typically has at least two orifices of fixed size and identical dimensions. Switching is achieved by the slider sliding relative to the main valve seat, which is usually accompanied by pressure relief. If the main valve seat has only two identical orifices, the pressure relief amount is insufficient, and the high-pressure fluid that cannot be discharged in time will violently impact the outer surface of the slider, causing liquid hammer. If the main valve seat has three identical orifices, the pressure relief amount is prone to being too large, and an excessive pressure relief flow may rapidly reduce the pressure difference across the slider. In cases of insufficient switching power or changes in operating conditions, insufficient effective pressure difference can easily prevent the slider from moving to the correct position, resulting in switching failure. Utility Model Content

[0004] Therefore, it is necessary to provide a three-way valve that can meet the pressure differential required for switching while satisfying sufficient pressure relief and reducing or preventing liquid slugging, so as to improve the switching reliability of the three-way valve.

[0005] The three-way valve includes a valve body, a valve seat, and a slider. The valve body has a valve cavity, a first valve port, a second valve port, and a third valve port, which are respectively connected to the valve cavity. Along the radial direction of the valve cavity, the first valve port is located on one side of the valve body, and the second and third valve ports are spaced apart on the other side. The valve seat is installed within the valve cavity and has a first flow hole, a second flow hole, and a pressure regulating hole spaced apart. The first flow hole is connected to the second valve port, and the second flow hole is connected to the third valve port. The diameter of the pressure regulating hole is smaller than either the diameter of the first flow hole or the diameter of the second flow hole. Firstly, the slider is installed inside the valve cavity and pressed against the valve seat; the slider can slide along the valve cavity axis to connect the second valve port and the third valve port to a first connected state or to connect the first valve port and the third valve port to a second connected state; the slider is provided with a transition cavity and sealing portions disposed on both sides of the transition cavity along the valve cavity axis; during the switching process between the first connected state and the second connected state, one of the first flow hole and the second flow hole can be connected to the valve cavity, and the other can be connected to the pressure regulating hole through the transition cavity, and the pressure regulating hole is connected to the valve cavity.

[0006] Understandably, the slider moves relative to the valve seat along the valve cavity axis to switch between the first and second connected states. During the slider's reversing movement, the three-way valve experiences a pressure relief state. In this state, both the first and second flow orifices can communicate with the valve cavity to achieve pressure relief. Specifically, one of the first and second flow orifices communicates with the valve cavity through a gap with the sealing part, while the other communicates with the pressure regulating orifice through a transition cavity, and then with the valve cavity again through the pressure regulating orifice to achieve pressure relief. The pressure regulating orifice increases the pressure relief amount, reduces the impact of high-pressure fluid, and extends service life. Simultaneously, the diameter of the pressure regulating orifice is smaller than either the diameter of the first orifice or the diameter of the second flow orifice to control the pressure relief amount from becoming excessive, ensuring sufficient pressure differential during reversal and guaranteeing the reliability of the reversal while increasing the pressure relief amount.

[0007] In one embodiment, along the axial direction of the valve cavity, the pressure regulating hole is located on the side of the first flow hole away from the second flow hole; or, along the axial direction of the valve cavity, the pressure regulating hole is located on the side of the second flow hole away from the first flow hole.

[0008] In one embodiment, the size of the sealing portion along the axial direction of the valve cavity is L, and the diameter of the pressure regulating hole is D, where D > L.

[0009] In one embodiment, the pressure regulating orifice includes a main body section and a flow-draining section connected to the main body section. The flow-draining section forms the orifice of the pressure regulating orifice and gradually expands from the main body section toward the valve cavity along the axial direction of the pressure regulating orifice.

[0010] In one embodiment, the dimension of the drainage section along the axial direction of the valve cavity is C; 0.03D≤C≤0.1D.

[0011] In one embodiment, the thickness of the valve seat is H, and the depth of the pressure regulating hole is h, where 0.05H ≤ h ≤ 0.2H.

[0012] In one embodiment, along the axial direction of the valve cavity, the size of the sealing portion is L, and the diameter of the pressure regulating hole is D, where 0.5L≤D≤L; The pressure regulating hole includes a main body section and a flow-draining section connected to the main body section. The flow-draining section forms the orifice of the pressure regulating hole. Along the axial direction of the pressure regulating hole, the flow-draining section gradually expands from the main body section toward the valve cavity and forms a gap with the sealing part.

[0013] In one embodiment, the orifice wall of the drainage section forms a drainage slope, and the angle between the extension direction of the drainage slope and the axis of the valve cavity is α, where 15°≤α≤60°.

[0014] In one embodiment, the depth dimension of the pressure regulating hole is h, and the dimension of the drainage section along the axial direction of the pressure regulating hole is b, where 0.1h ≤ b ≤ 0.6h.

[0015] In one embodiment, the depth of the pressure regulating hole is h, and the thickness of the valve seat is H, where 0.2H ≤ h ≤ 0.5H. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A cross-sectional view of the three-way valve provided in this application in its first connected state; Figure 2 A cross-sectional view of the three-way valve provided in this application in the second connected state; Figure 3 A cross-sectional view of one embodiment of the three-way valve provided in this application in the depressurization state; Figure 4 for Figure 3 A magnified view of a section at point A in the middle; Figure 5 This is a partially enlarged view of another embodiment of the three-way valve provided in this application under depressurization conditions.

[0018] Reference numerals: 100, three-way valve; 200, connecting pipe; 10, valve body; 101, valve cavity; 102, first valve port; 103, second valve port; 104, third valve port; 20, valve seat; 201, first flow hole; 202, second flow hole; 203, pressure regulating hole; 2031, main body section; 2032, drainage section; 20321, drainage slope; 204, welding ring hole; 30, slider; 301, transition cavity; 31, sealing part. Detailed Implementation

[0019] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0020] It should be noted that when a component is referred to as being "fixed to," "set on," or "properly placed on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0022] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is 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 can mean that the first feature is 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.

[0023] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0024] Please see Figures 1 to 5 This application provides a three-way valve 100, which includes a valve body 10, a valve seat 20, and a slider 30. The valve body 10 has a valve cavity 101, a first valve port 102, a second valve port 103, and a third valve port 104. The first valve port 102, the second valve port 103, and the third valve port 104 are respectively connected to the valve cavity 101 and can also be connected to an external pipe 200 to facilitate fluid transport. Along the radial direction of the valve cavity 101, the valve body 10 has a first valve port 102 on one side and a second valve port 103 and a third valve port 104 spaced apart on the other side. The valve seat 20 is installed in the valve cavity 101 and has a first flow hole 201 and a second flow hole 202 spaced apart. The first flow hole 201 is connected to the second valve port 103, and the second flow hole 202 is connected to the third valve port 104. The slider 30 is installed inside the valve cavity 101 and pressed against the valve seat 20. The slider 30 can slide along the axis of the valve cavity 101, and the fluid reversal is achieved by the movement of the slider 30 relative to the valve seat 20. The slider 30 is provided with a transition cavity 301 and a sealing part 31 located on both sides of the transition cavity 301 along the axis of the valve cavity 101. The sealing part 31 is pressed against the valve seat 20 to form a sealing fit with the valve seat 20.

[0025] like Figure 1 and Figure 2 As shown, the three-way valve 100 has a first connected state and a second connected state. The slider 30 switches between the first connected state and the second connected state by moving axially along the valve cavity 101, thereby achieving reversal.

[0026] like Figure 1As shown, in the first connected state, the slider 30 abuts against one side of the valve body 10 along the axial direction of the valve cavity 101. At this time, the first flow hole 201 and the second flow hole 202 are connected through the transition cavity 301, that is, the second valve port 103 and the third valve port 104 are connected. At this time, the sealing part 31 surrounds the outside of the first flow hole 201 and the second flow hole 202 and forms a seal with the surface of the valve seat 20 to isolate the first flow hole 201 and the second flow hole 202 from the valve cavity 101.

[0027] like Figure 2 As shown, in the second connected state, the slider 30 abuts against the other side of the valve body 10 along the axial direction of the valve cavity 101. At this time, the second flow hole 202 is connected to the valve cavity 101, thereby achieving connection with the first valve port 102, that is, the third valve port 104 is connected to the first valve port 102. The first flow hole 201 is connected to the transition cavity 301, and the sealing part 31 surrounds the outside of the first flow hole 201 and forms a seal with the surface of the valve seat 20 to isolate the connection between the first flow hole 201 and the valve cavity 101.

[0028] In a specific embodiment, capillary tubes are connected to both sides of the valve body 10 along the axial direction of the valve cavity 101. Gas is delivered into the valve cavity 101 through one of the capillary tubes to form a high pressure on that side, thereby creating a pressure difference on both sides of the slider 30 to push the slider 30 to move toward the other side, thus realizing the switching between the first connected state and the second connected state.

[0029] The three-way valve 100 also has a pressure relief state, during which the slider 30 undergoes a pressure relief state while switching between the first and second connected states. In related technologies, when the slider 30 moves to the middle position of the valve body 10 in the pressure relief state, it blocks one of the first flow hole 201 and the second flow hole 202, while the other flows through the gap between itself and the blocking part 31 to communicate with the valve cavity 101 for pressure relief. This configuration results in insufficient pressure relief, and the high-pressure fluid cannot be discharged from the valve cavity 101 in time, causing liquid hammer on the slider 30, affecting its use and shortening its lifespan.

[0030] Therefore, in an optional embodiment of this application, the valve seat 20 is provided with a pressure regulating hole 203. For example... Figures 3 to 5 As shown, in the depressurization state, one of the first flow hole 201 and the second flow hole 202 can be connected to the valve chamber 101 through the gap between them and the sealing part 31, and the other can be connected to the pressure regulating hole 203 through the transition chamber 301, and then connected to the valve chamber 101 through the pressure regulating hole 203, so that the first flow hole 201 and the second flow hole 202 can jointly achieve fluid depressurization, thereby increasing the depressurization amount and preventing the high-pressure fluid from failing to be discharged in time and causing liquid hammer on the slider 30.

[0031] In a specific embodiment, the diameter of the pressure regulating hole 203 is smaller than either the diameter of the first flow hole 201 or the diameter of the second flow hole 202. The diameter of the pressure regulating hole 203 is set to avoid excessive pressure relief, so that there is a sufficiently large pressure difference on both sides of the slider 30 along the axial direction of the valve cavity 101 for switching, thereby increasing the pressure relief while improving the reliability of switching.

[0032] In summary, the pressure relief of the three-way valve 100 in the depressurization state is increased by setting the pressure regulating hole 203, so that the fluid can be discharged in time to avoid liquid hammer. At the same time, by limiting the diameter of the pressure regulating hole 203, the pressure relief can be controlled to prevent it from being too large, ensuring the pressure difference required during switching and improving the reliability of the switching process.

[0033] In one embodiment, along the axial direction of the valve cavity 101, the pressure regulating hole 203 is located on the side of the first flow hole 201 away from the second flow hole 202. In another embodiment, along the axial direction of the valve cavity 101, the pressure regulating hole 203 is located on the side of the second flow hole 202 away from the first flow hole 201.

[0034] For ease of explanation, this application uses the example of a pressure regulating hole 203 located on the side of the first flow hole 201 away from the second flow hole 202, along the axial direction of the valve cavity 101. Figure 3 As shown, in the depressurization state, along the axis of the valve chamber 101, the sealing part 31 on one side of the slider 30 is pressed against the pressure regulating hole 203. A gap exists between the pressure regulating hole 203 and the sealing part 31 to connect the valve chamber 101 and the transition chamber 301, thereby allowing the first flow hole 201 to connect with the valve chamber 101. The sealing part 31 on the other side of the slider 30 is pressed against the second flow hole 202. The second flow hole 202 connects to the valve chamber 101 through the gap between itself and the sealing part 31, so that both the first flow hole 201 and the second flow hole 202 can connect with the valve chamber 101 for depressurization, which helps to increase the depressurization amount.

[0035] like Figure 3 and Figure 4 As shown, in an optional embodiment, the size of the blocking part 31 along the axial direction of the valve cavity 101 is L, and the diameter of the pressure regulating hole 203 is D, where D > L. That is, the diameter of the pressure regulating hole 203 is smaller than the diameter of the first flow hole 201 and the diameter of the second flow hole 202, but larger than the size of the blocking part 31 along the axial direction of the valve cavity 101. This arrangement allows for a larger gap between the pressure regulating hole 203 and the blocking part 31, enabling the pressure regulating hole 203 to connect between the valve cavity 101 and the transition cavity 301, thereby increasing the pressure relief.

[0036] like Figure 4As shown, in a specific embodiment, the pressure regulating hole 203 includes a main body section 2031 and a flow guiding section 2032 connected to the main body section 2031. The flow guiding section 2032 forms the orifice of the pressure regulating hole 203. Along the axial direction of the pressure regulating hole 203, the flow guiding section 2032 gradually expands from the main body section 2031 toward the valve cavity 101 to form an inclined flow guiding slope 20321, which is used to guide the flow of fluid and promote the smoothness of the flow of fluid between the pressure regulating hole 203 and the transition cavity 301, and between the pressure regulating hole 203 and the valve cavity 101.

[0037] like Figure 4 As shown, in a specific embodiment, the dimension of the drainage section 2032 along the axial direction of the valve cavity 101 is C, where 0.03D≤C≤0.1D. This design, while forming the drainage section 2032, avoids excessively large dimensions of the drainage section 2032 along the axial direction of the valve cavity 101, which would result in an excessively large gap between the drainage section 2032 and the sealing part 31, thus preventing excessive pressure relief and ensuring sufficient pressure differential during switching. For example, C = 0.03D, 0.05D, or 0.1D.

[0038] like Figure 3 and Figure 4 As shown, in a specific embodiment, the thickness of the valve seat 20 is H, and the depth of the pressure regulating hole 203 is h, where 0.05H ≤ h ≤ 0.2H. It is understood that the greater the depth of the pressure regulating hole 203, the greater the amount of fluid that can be temporarily stored in it, and therefore the greater the pressure relief. Therefore, the depth of the pressure regulating hole 203 is limited to be relatively small compared to the thickness of the valve seat 20 to avoid excessive pressure relief and ensure sufficient pressure differential for switching. For example, h = 0.05H, 0.1H, or 0.2H.

[0039] like Figure 5As shown, in another optional embodiment, the size of the blocking part 31 along the axial direction of the valve cavity 101 is L, and the diameter of the pressure regulating hole 203 is D, where 0.5L≤D≤L. The diameter of the pressure regulating hole 203 is smaller than that of the blocking part 31. Therefore, the pressure regulating hole 203 also includes a main body section 2031 and a drainage section 2032 connected to the main body section 2031. The drainage section 2032 forms the orifice of the pressure regulating hole 203. Along the axial direction of the pressure regulating hole 203, the drainage section 2032 gradually expands from the main body section 2031 toward the valve cavity 101 and forms a gap with the blocking part 31. The diameter of the main body section 2031 is D, and along the axial direction of the pressure regulating hole 203, the blocking part 31 can completely cover the main body section 2031. At this time, the pressure regulating hole 203, through the gradually expanding drainage section 2032, forms a gap with the sealing part 31, enabling fluid communication and forming a drainage slope 20321. The drainage slope 20321 extends obliquely towards the transition cavity 301 and the valve cavity 101 to guide fluid flow. This arrangement can control the pressure relief to prevent it from becoming too large, further ensuring sufficient pressure difference when the slider 30 reverses direction. For example, D = 0.5L, 0.8L, or L.

[0040] like Figure 5 As shown, in a specific embodiment, the orifice wall of the drainage section 2032 forms a drainage slope 20321, and the angle between the extension direction of the drainage slope 20321 and the axis of the valve cavity 101 is α, where 15°≤α≤60°. Thus, the drainage slope 20321 has a good inclination for drainage, promoting smooth fluid flow. Simultaneously, it also allows the drainage slope 20321 to extend to form a gap with the sealing part 31 for fluid passage. For example, α = 15°, 45°, or 60°.

[0041] like Figure 5 As shown, in a specific embodiment, the depth dimension of the pressure regulating hole 203 is h, and the dimension of the drainage section 2032 along the axial direction of the pressure regulating hole 203 is b, where 0.1h ≤ b ≤ 0.6h. By limiting the depth range of the drainage section 2032 to be sufficiently large to accommodate the setting of pressure regulating holes 203 with different diameters, a sufficient depth dimension range is provided for the setting of the drainage section 2032. This allows the drainage section 2032 to form a drainage slope 20321 with a good inclination, while also extending to form a gap with the sealing part 31. For example, b = 0.1h, 0.3h, or 0.6h.

[0042] like Figure 3 and Figure 5 As shown, in a specific embodiment, the depth of the pressure regulating hole 203 is h, and the thickness of the valve seat 20 is H, where 0.2H ≤ h ≤ 0.5H. Thus, by setting a larger depth of the pressure regulating hole 203, the pressure relief amount is increased, ensuring the pressure relief effect. For example, h = 0.2H, 0.3H, or 0.5H.

[0043] like Figures 1 to 5 As shown, in an optional embodiment, the valve seat 20 is further provided with a welding ring hole 204. The first flow hole 201 and the second flow hole 202 are respectively spaced apart from the welding ring hole 204. Along the radial direction of the valve cavity 101, the welding ring hole 204 is located on the side of the valve seat 20 away from the pressure regulating hole 203, and is used to fill with solder, which helps to increase the amount of solder. The valve seat 20 is welded and fixed to the valve body 10 through the solder in the welding ring hole 204, thereby improving the reliability of the welding.

[0044] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0045] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. A three-way valve, characterized in that, include: The valve body has a valve cavity, a first valve port, a second valve port, and a third valve port, the first valve port, the second valve port, and the third valve port being respectively connected to the valve cavity; along the radial direction of the valve cavity, the first valve port is provided on one side of the valve body, and the second valve port and the third valve port are spaced apart on the other side; A valve seat is installed inside the valve cavity and is provided with a first flow hole, a second flow hole, and a pressure regulating hole spaced apart. The first flow hole is connected to the second valve port, and the second flow hole is connected to the third valve port. The diameter of the pressure regulating hole is smaller than either the diameter of the first flow hole or the diameter of the second flow hole. A slider is installed inside the valve cavity and pressed against the valve seat above it; The slider can slide along the valve cavity axis to connect the second valve port and the third valve port to a first connected state or to connect the first valve port and the third valve port to a second connected state; the slider is provided with a transition cavity and a sealing part disposed on both sides of the transition cavity along the valve cavity axis; during the switching process between the first connected state and the second connected state, one of the first flow hole and the second flow hole can be partially connected to the valve cavity, and the other can be connected to the pressure regulating hole through the transition cavity, and the pressure regulating hole is connected to the valve cavity.

2. The three-way valve according to claim 1, characterized in that, Along the axial direction of the valve cavity, the pressure regulating hole is located on the side of the first flow hole away from the second flow hole; or, along the axial direction of the valve cavity, the pressure regulating hole is located on the side of the second flow hole away from the first flow hole.

3. The three-way valve according to claim 2, characterized in that, Along the axial direction of the valve cavity, the size of the sealing part is L, and the diameter of the pressure regulating hole is D, where D > L.

4. The three-way valve according to claim 3, characterized in that, The pressure regulating hole includes a main body section and a flow-draining section connected to the main body section. The flow-draining section forms the orifice of the pressure regulating hole and gradually expands from the main body section toward the valve cavity along the axial direction of the pressure regulating hole.

5. The three-way valve according to claim 4, characterized in that, Along the axial direction of the valve cavity, the dimension of the drainage section is C; 0.03D≤C≤0.1D.

6. The three-way valve according to claim 3, characterized in that, The thickness of the valve seat is H, and the depth of the pressure regulating hole is h, where 0.05H ≤ h ≤ 0.2H.

7. The three-way valve according to claim 2, characterized in that, Along the axial direction of the valve cavity, the size of the sealing part is L, and the diameter of the pressure regulating hole is D, where 0.5L≤D≤L; The pressure regulating hole includes a main body section and a flow-draining section connected to the main body section. The flow-draining section forms the orifice of the pressure regulating hole. Along the axial direction of the pressure regulating hole, the flow-draining section gradually expands from the main body section toward the valve cavity and forms a gap with the sealing part.

8. The three-way valve according to claim 7, characterized in that, The orifice wall of the drainage section forms a drainage slope, and the angle between the extension direction of the drainage slope and the axis of the valve cavity is α, where 15°≤α≤60°.

9. The three-way valve according to claim 7, characterized in that, The depth dimension of the pressure regulating hole is h, and the dimension of the drainage section along the axial direction of the pressure regulating hole is b, where 0.1h≤b≤0.6h.

10. The three-way valve according to claim 7, characterized in that, The depth of the pressure regulating hole is h, and the thickness of the valve seat is H, where 0.2H ≤ h ≤ 0.5H.

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