Throttling valve core, new type of straight-through flat throttle valve

Abstract

This invention belongs to the field of fluid transport technology, specifically relating to a throttling valve core and a novel straight-through flat throttling valve, aiming to solve the problems of poor accuracy, easy clogging, and inability to detect leakage in a timely manner in existing throttling valves. The throttling valve core includes a valve core body, a valve orifice, a first connecting part, and a second connecting part. The first connecting part is located at the top of the valve core body and has a first groove; the second connecting part is located at the bottom of the valve core body and has a second groove. The valve orifice includes a first section, a second section, and a third section. The first section is an elliptical through-hole; the second section is a rectangular through-hole; and the third section is a semi-circular through-hole. The valve core body has a plate-like structure. The novel straight-through flat throttling valve includes this throttling valve core. The solution disclosed in this invention can achieve accurate leakage monitoring, simple and reliable control, low pressure loss, simplified equipment, fewer personnel required, and low daily operating costs.

Description

Technical Field

[0001] This invention belongs to the field of fluid transport technology, specifically relating to a throttle valve core and a novel straight-through flat throttle valve. Background Technology

[0002] In the process of oil drilling and development, well control operations are frequently performed. These operations apply appropriate back pressure to the bottom of the well to balance formation pressure. The principle behind well control is to adjust the opening of the well control choke valve to create resistance to the fluids within the oil and gas well, thus generating back pressure. Therefore, the well control choke valve plays a crucial role in drilling control pipelines. Adjusting the opening of the choke valve controls the pressure within the well, thereby preventing safety accidents such as well kicks and blowouts.

[0003] Domestic and international drilling companies face significant well control risks in their wells in shale gas fields in Sichuan and Chongqing, Qinghai, Jidong, and Dagang. Early monitoring technologies for overflows and blowouts are still immature, and pressure control accuracy is low during circulation venting and overflow handling. Although conventional controlled pressure drilling technology is widely used—which involves installing a rotary control head and a dedicated simple choke manifold to guide the affected drilling fluid out of the well after oil and gas intrusion—the following problems exist in its application: 1) Conventional controlled pressure drilling systems lack flow monitoring capabilities, failing to detect overflows and leaks early, thus insufficiently ensuring well control safety; 2) In-use gas-fluid choke control systems are complex and lack operability; the on / off control accuracy is only 3%-5%, with large errors, failing to meet the requirements for controlled pressure discharge of affected drilling fluid and controlled pressure plugging processes; 3) When the angle choke valve is fully open, the flow area is 36.3% of the pipeline (Φ103mm), resulting in a large pressure drop and easy clogging. Summary of the Invention

[0004] In order to solve the above-mentioned problems in the prior art, namely the problems of poor accuracy, easy clogging and inability to detect leakage in time, the present invention provides a throttle valve core and a novel straight-through flat throttle valve.

[0005] The first aspect of the present invention discloses a throttle valve core, the throttle valve core including a valve core body, a valve hole, a first connecting portion and a second connecting portion, the first connecting portion being disposed on the top of the valve core body and having a first slot; the second connecting portion being disposed on the bottom of the valve core body and having a second slot.

[0006] The valve orifice includes a first orifice section, a second orifice section, and a third orifice section. The first orifice section is an elliptical through-hole; the second orifice section is a rectangular through-hole; and the third orifice section is a semi-circular through-hole.

[0007] The height of the elliptical through hole is h1, the height of the rectangular through hole is h2, and the height of the semi-circular through hole is h3; Where x1 is the distance from a point on the elliptical through hole to the longitudinal central axis of the valve core body, and y1 is the distance from a point on the elliptical through hole to the bottom of the semi-circular through hole;

[0008] x2 = h3, y2 ∈ [h3, h2 + h3]; where x2 is the distance from the vertex of the rectangular through hole to the longitudinal center axis of the valve core body, and y2 is the distance from the point on the radius vertical side of the rectangular through hole to the bottom of the semi-circular through hole;

[0009] x3 2 +(y3-h3) 2 =h3 2 Where x3 is the distance from a point on the semi-circular through hole to the longitudinal center axis of the valve core body, and y3 is the distance from a point on the semi-circular through hole to the bottom of the semi-circular through hole.

[0010] In some preferred embodiments, the distance from the vertex of the elliptical through hole to the top of the valve core body is equal to the distance from the vertex of the elliptical through hole to the bottom of the valve core body.

[0011] In some preferred embodiments, y1∈[h2+h3,h1+h2+h3].

[0012] In some preferred embodiments, y3∈[0, r], where r is the radius of the semi-circular through hole.

[0013] In some preferred embodiments, the first hole segment, the second hole segment, and the third hole segment constitute a shield-shaped through hole.

[0014] In some preferred embodiments, the total height of the valve orifice is a preset height; the total width of the valve orifice is a preset width.

[0015] In some preferred embodiments, the valve core body is a plate-shaped structure.

[0016] The second aspect of the present invention discloses a novel straight-through flat plate throttle valve, comprising a valve core, wherein the valve core is any of the throttle valve cores described above; the novel straight-through flat plate throttle valve further comprises a valve body, a valve stem, an upper flange, an upper sleeve, a clamping nut, a valve seat, a guide rod, a lower flange, and a lower sleeve, wherein the valve body is cylindrical and elongated, and the interior of the valve body has a flow channel extending along its length, and the throttle valve core is vertically disposed in the middle of the flow channel;

[0017] The valve stem is disposed on the top of the throttle valve core and is fixedly connected to the first slot;

[0018] The guide rod is disposed at the bottom of the throttle valve core and is connected to the second slot;

[0019] The upper flange has an upper through hole for the valve stem to pass through;

[0020] The lower flange has a lower through hole for accommodating the guide rod.

[0021] The clamping nut is located at the top of the valve stem;

[0022] A one-way valve is provided on the side of the upper flange, and the one-way valve is used to relieve the pressure inside the valve body;

[0023] The valve stem is provided with a reverse sealing surface that abuts against the inner wall of the upper flange;

[0024] The valve seat is fitted with the throttle valve core, and a wave spring is provided between the outer side of the valve seat and the valve body;

[0025] The upper sheath is disposed on the outside of the valve stem; the lower sheath is disposed on the outside of the guide rod.

[0026] In some preferred embodiments, in the initial state, the throttle valve core descends to abut against the lower flange, and the valve core body closes the flow passage;

[0027] In operation, the throttle valve core rises to the point where it connects with the valve orifice and the flow passage, thereby adjusting the flow cross-section of the flow passage.

[0028] In some preferred embodiments, the flow channel includes an inflow channel and an outflow channel, both of which are straight-through channels, and the included angle between the inflow channel and the outflow channel is 180 degrees.

[0029] The beneficial effects of this invention are as follows:

[0030] 1) The throttle valve core and the novel straight-through flat throttle valve disclosed in this invention have reliable early and accurate leakage detection, and are simple and reliable to control, practical in function, low in pressure consumption, require fewer personnel, have low operating day costs, and can be widely used by the client for early leakage detection and rapid pressure control system, providing a solid technical guarantee for well control safety.

[0031] 2) The solution disclosed in this invention can realize the serialization and large-scale application of pressure controlled drilling technology; when the inlet flow rate is 32L / s, the flow coefficient or opening degree and pressure drop are linear, and the linearity can reach 90.1%, and its technical level is leading in China. Attached Figure Description

[0032] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0033] Figure 1 This is a schematic diagram of a specific embodiment of the throttle valve core in this invention;

[0034] Figure 2 This is a half-sectional schematic diagram of a specific embodiment of the novel straight-through flat plate throttle valve of the present invention;

[0035] Figure 3 This is a flowchart of parameter optimization based on genetic algorithm in this invention;

[0036] Figure 4 This is an internal pressure drop cloud diagram of the throttle valve core in this invention.

[0037] Explanation of reference numerals in the attached drawings: 1. Wave spring; 2. Valve seat; 3. Valve body; 4. Guide rod; 5. Sealing ring; 6. First sealing ring; 7. Lower sleeve; 8. Nut; 9. Stud; 10. Socket head cap screw; 11. Gland; 12. Pressure ring; 13. Lower flange; 14. Washer ring; 15. Second sealing ring; 16. Valve core; 161. First slot; 162. Valve core body; 163. Second slot; 164. Valve hole; 1641. First hole section; 1642. Second hole section; 1643. Third hole section; 17. Handwheel; 18. Third sealing ring; 19. Fourth sealing ring; 20. Upper sleeve; 21. Thrust bearing; 22. Upper flange; 23. Valve stem; 24. Check valve; 25. Fifth sealing ring; 26. Valve stem nut; 27. Straight-through pressure injection cup; 28. Compression nut. Detailed Implementation

[0038] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0039] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0040] See attached document Figure 1 , Figure 1 This is a schematic diagram of a specific embodiment of the throttle valve core of the present invention. The first aspect of the present invention provides a throttle valve core, including a valve core body 162, a valve hole 164, a first connecting portion and a second connecting portion. The first connecting portion is disposed at the top of the valve core body and has a first slot 161; the second connecting portion is disposed at the bottom of the valve core body and has a second slot 163; the valve hole includes a first hole segment 1641, a second hole segment 1642 and a third hole segment 1643. The first hole segment is an elliptical through hole; the second hole segment is a rectangular through hole; and the third hole segment is a semi-circular through hole.

[0041] The valve core body has a plate-like structure.

[0042] The height of the elliptical through hole is h1, the height of the rectangular through hole is h2, and the height of the semi-circular through hole is h3. Where x1 is the distance from a point on the elliptical through hole to the longitudinal central axis of the valve core body, and y1 is the distance from a point on the elliptical through hole to the bottom of the semi-circular through hole.

[0043] x2 = h3, y2 ∈ [h3, h2 + h3]; where x2 is the distance from the vertex of the rectangular through hole to the longitudinal center axis of the valve core body, and y2 is the distance from the point on the radius vertical side of the rectangular through hole to the bottom of the semi-circular through hole.

[0044] x3 2 +(y3-h3) 2 =h3 2 Where x3 is the distance from a point on the semi-circular through hole to the longitudinal center axis of the valve core body, and y3 is the distance from a point on the semi-circular through hole to the bottom of the semi-circular through hole.

[0045] Preferably, the distance from the vertex of the elliptical through hole to the top of the valve core body is equal to the distance from the vertex of the elliptical through hole to the bottom of the valve core body.

[0046] y1∈[h2+h3,h1+h2+h3。

[0047] y3∈[0, r], where r is the radius of the semi-circular through hole.

[0048] The first, second, and third hole sections form a shield-shaped through hole.

[0049] The total height of the valve orifice is the preset height; the total width of the valve orifice is the preset width.

[0050] See attached document Figure 2 , Figure 2This is a half-sectional schematic diagram of a specific embodiment of the novel straight-through flat plate throttle valve of the present invention. A second aspect of the present invention provides a novel straight-through flat plate throttle valve, including a valve core 16, which is the throttle valve core described above. The novel straight-through flat plate throttle valve also includes a valve body 3, a valve stem 23, an upper flange 22, an upper sleeve 20, a clamping nut 28, a valve seat 2, a guide rod 4, a lower flange 13, and a lower sleeve 7. The valve body is cylindrical and elongated, and its interior has a flow channel extending along its length. The throttle valve core is vertically disposed in the middle of the flow channel. The valve stem is disposed at the top of the throttle valve core and is connected to the first... The valve stem is fixed in place by a slot; the guide rod is located at the bottom of the throttle valve core and connected to the second slot. The guide rod prevents the valve stem from rising or falling, which could cause the valve cavity pressure to increase and the sealing grease to leak out; the upper flange has an upper through hole for the valve stem to pass through; the lower flange has a lower through hole for accommodating the guide rod; a clamping nut is located at the top of the valve stem; a one-way valve 24 is located on the side of the upper flange to relieve the pressure inside the valve body; the valve stem has a reverse sealing surface that abuts against the inner wall of the upper flange; the valve seat is fitted with the throttle valve core, and a wave spring 1 is located between the outer side of the valve seat and the valve body; the upper sleeve is located on the outer side of the valve stem; the lower sleeve is located on the outer side of the guide rod.

[0051] In the initial state, the throttle valve core descends to abut against the lower flange, and the valve core body closes the flow passage; in the working state, the throttle valve core rises to connect the valve orifice with the flow passage to adjust the flow cross section of the flow passage.

[0052] This new type of straight-through flat throttle valve relies on the free contact between the metal valve core and the metal valve seat plane, achieving a seal with the help of sealing grease and the action of the medium. The sealing surface at the inlet end (upstream) plays a role, thus the valve seat and valve core withstand the pipeline pressure.

[0053] The valve stem rises and falls during the valve core opening and closing process, providing an on / off indicator. The upper flange, lower flange, and valve body are bolted together, and the sealing ring uses a pressure self-sealing gasket, ensuring a safe and reliable seal.

[0054] Furthermore, the flow channel includes an inflow channel and an outflow channel, both of which are straight-through channels, and the angle between the inflow channel and the outflow channel is 180 degrees.

[0055] A sealing ring 5 is provided between the guide rod and the lower flange. A pressure ring 12 and a pressure cover 11 are sequentially provided at the lower part of the sealing ring. The pressure ring is fitted onto the guide rod, and one or more first sealing rings 6 are provided between the pressure ring and the guide rod.

[0056] Preferably, the upper flange is connected to the valve body by a nut 8 and a stud 9.

[0057] A locking element is provided on the outside of the lower flange to secure the gland.

[0058] Preferably, the setter is an internal hexagon set screw 10.

[0059] A gasket 14 is provided between the lower flange and the valve body.

[0060] Furthermore, one or more second sealing rings 15 are provided between the valve seat and the valve body.

[0061] A handwheel 17 is provided at the top of the valve stem to control the raising and lowering of the valve core. A valve stem nut 26 is provided on the outside of the valve stem, and one or more third sealing rings 18 are provided between the valve stem nut and the upper sleeve. One or more fourth sealing rings 19 are provided between the valve stem nut and the valve stem.

[0062] The upper sleeve is equipped with a dedicated straight-through pressure grease cup 27 for lubricating bearings, facilitating on-site grease filling. A vent hole is located on the side to allow observation of the grease filling process. To prevent contamination, the vent hole is normally covered with an O-ring seal.

[0063] A thrust bearing 21 is also provided between the valve stem nut and the upper sleeve.

[0064] Furthermore, one or more fifth sealing rings 25 are provided between the pressure ring and the lower flange.

[0065] Preferably, the valve body is manufactured by integral die forging without any welding, resulting in high structural strength.

[0066] Further, refer to the appendix Figure 3 , Figure 3 This is a flowchart of parameter optimization based on genetic algorithm in this invention; (1) Propose optimization problem, collect relevant data and information, such as changing the valve core position, optimizing the throttling into ellipse, square, shield shape, etc. The dynamic performance requirements of the control system are "stability, accuracy and speed". The straight-through flat plate throttle valve can be equivalent to a simple sluice gate system. Under the premise of ensuring its stability, the performance indicators of the speed and accuracy of the straight-through flat plate throttle valve can be given by time domain indicators, including transient indicators and steady-state indicators.

[0067] The speed of a straight-through flat throttle valve can be evaluated by its adjustment time. Improving the speed of a straight-through flat throttle valve can minimize the control index j1, expressed as: j1 = t s [c(∞)±2%]; where c(∞) is the final steady-state value of the main valve of the straight-through flat plate throttle valve.

[0068] To minimize the control index j2, the expression is: j2 = e(t) = (Y (t) -Y0) / Y0; where Y0 is the unit input signal, Y (t) This is the output signal.

[0069] The smaller the overshoot of a straight-through flat throttle valve, the better the overall stability of the valve. Therefore, improving the stability of a straight-through flat throttle valve can minimize the control index j3, which is expressed as: j3 = σ p / 100=(c(t p )-c(∞)) / c(∞); where c(t) p ) represents the time required for the step response curve to reach its first peak.

[0070] Since the same set of structural parameters for a straight-through flat throttle valve cannot optimize all valve performance indicators, it is necessary to set an overall objective function based on the weight of each optimization indicator. The objective function is as follows: Where, j i Let i be the sub-objective function; Let be the expected value of the i-th sub-objective function; Let be the deviation variable of the i-th objective function.

[0071] The priority factor of the i-th objective function is 1; where represents the weight coefficients of the i-th objective function.

[0072] (2) Modeling. Establish the optimal mathematical model, determine the variables, and obtain the objective function and relevant constraints. Given the known structure and parameters of the main stage of the straight-through flat plate throttle valve, design the parameters to be optimized as independent structural and external parameters of the pilot stage valve of the straight-through flat plate throttle valve, and select the pilot stage valve bandwidth ω in the dynamic optimization objective function. n The valve port area gradient w and the control pressure p of the pilot valve s Therefore, the parameters to be optimized are: X = [x1x2x3] T =[ω n wp s ] T .

[0073] For straight-through flat-plate throttle valves, the pilot stage valve is typically a proportional valve, a servo valve, or a proportional-servo valve. According to literature, the bandwidth range for the pilot stage valve of a cartridge-type proportional throttle valve is: 0 ≤ ω. n ≤200HZ.

[0074] The stability and control accuracy of the valve core speed in a straight-through flat throttle valve are directly affected by the orifice size, which is largely determined by the orifice area gradient. This orifice area gradient is directly related to the orifice shape. Calculations can estimate the orifice area gradient to be approximately 0.03mm ≤ w ≤ 1.5mm. Based on relevant data, the area gradient range for the pilot valve of the straight-through flat throttle valve is taken as 0.01mm ≤ w ≤ 2mm.

[0075] (3) Analyze the mathematical model and select an appropriate pipe cross-sectional area for calculation.

[0076] (4) Obtain the optimal solution using a computer by developing a program. The genetic algorithm uses an individual fitness function to evaluate the quality of individuals. The higher the fitness function value, the greater the probability that the individual will be inherited by the next generation; conversely, the lower the fitness function value, the smaller the probability. Fitness must be non-negative. Therefore, a general and effective transformation relationship should be designed to ensure that the transformation function between the objective function value and the individual fitness always takes a non-negative value.

[0077] For optimization problems that require finding the minimum value of the objective function, the transformation method is as follows:

[0078]

[0079] 5) Conduct experiments on the optimal solution to verify whether it meets the standard.

[0080] Numerical simulation: (1) Using CFD numerical simulation method, numerical simulation is performed on the currently used PFF series flat plate throttle valve to reveal its flow field distribution characteristics and pressure control throttle characteristics; (2) Using CFD numerical simulation method, the erosion characteristics of the currently used PFF series flat plate throttle valve are simulated to determine its erosion location and erosion rate; (3) Using CFD numerical simulation method, the throttle characteristics of throttle valves with different valve plate structures are simulated, and the valve plate shape is optimized with the linear throttle characteristics of pressure control drilling as a constraint; (4) Using CFD numerical simulation method, the erosion characteristics of the throttle valve after structural optimization are simulated to clarify the anti-erosion material spraying location and recommend the performance index of the spraying material.

[0081] In summary, a multi-objective genetic algorithm was used to optimize the various parameters and dynamic characteristics of the novel straight-through flat throttle valve, resulting in an optimal shield-shaped design. This shield is divided into three sections from bottom to top, with the lowest point of the valve orifice as the origin. Taking a 103mm diameter orifice as an example, the first section is a semi-circular orifice with a radius of 51.5mm; the second section is a semi-circular orifice with a length of 103mm and a width of 36.5mm; and the third section is an elliptical orifice with a major axis of 103mm and a minor axis of 30mm. At an inlet flow rate of 32L / s, the flow coefficient or opening degree exhibits linearity with the pressure drop, reaching 90.1%. Compared to existing throttle valves, this valve offers advantages such as early and accurate leakage monitoring, simple and reliable control, low pressure loss, practical functionality, simplified equipment, fewer personnel required, and lower daily operating costs.

[0082] Further refer to the appendix Figure 4 , Figure 4This is an internal pressure drop cloud diagram of the throttle valve core in this invention. The circular pressure drop curve obtained by numerical simulation as a function of valve opening shows the same trend as the actual pressure drop curve obtained from the oilfield. Furthermore, the pressure drop values ​​are close at the same opening, indicating that the numerical simulation technology is effective in this study. When the throttle valve orifice shape is shield-shaped, the pressure drop across the throttle valve is 1.242 MPa at a 20% opening. As the opening increases, the linearity of the throttle valve reaches 88.14%, meeting the requirements for precise pressure control in controlled-pressure drilling.

[0083] Currently, the flow area of ​​a throttle valve is controlled by changing the position of the valve core. However, the fluid pressure from the formation is not constant. To meet drilling safety requirements, the driller must constantly monitor changes in casing pressure and fluid flow rate, and adjust the opening of the throttle valve accordingly. The throttle valve core and novel straight-through flat throttle valve disclosed in this invention can maintain constant bottom hole pressure, bringing convenience to well control operations and effectively eliminating safety hazards.

[0084] Although the invention has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. The invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0085] In the description of this invention, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0086] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0087] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to those processes, articles, or apparatus / devices.

[0088] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A throttle valve core, characterized in that, The throttle valve core includes a valve core body, a valve hole, a first connecting part, and a second connecting part. The first connecting part is disposed on the top of the valve core body and has a first slot. The second connecting part is disposed on the bottom of the valve core body and has a second slot. The valve orifice includes a first orifice section, a second orifice section, and a third orifice section. The first orifice section is an elliptical through-hole; the second orifice section is a rectangular through-hole; and the third orifice section is a semi-circular through-hole. The height of the elliptical through hole is h1, the height of the rectangular through hole is h2, and the height of the semi-circular through hole is h3; Where x1 is the distance from a point on the elliptical through hole to the longitudinal central axis of the valve core body, and y1 is the distance from a point on the elliptical through hole to the bottom of the semi-circular through hole; x2 = h3, y2 ∈ [h3, h2 + h3]; where x2 is the distance from the vertex of the rectangular through hole to the longitudinal center axis of the valve core body, and y2 is the distance from the point on the radius vertical side of the rectangular through hole to the bottom of the semi-circular through hole; x3 2 +(y3-h3) 2 =h3 2 Where x3 is the distance from a point on the semi-circular through hole to the longitudinal center axis of the valve core body, and y3 is the distance from a point on the semi-circular through hole to the bottom of the semi-circular through hole.

2. The throttle valve core according to claim 1, characterized in that, The distance from the vertex of the elliptical through hole to the top of the valve core body is equal to the distance from the vertex of the elliptical through hole to the bottom of the valve core body.

3. The throttle valve core according to claim 2, characterized in that, y1∈ [h2+h3,h1+h2+h3。 4. The throttle valve core according to claim 3, characterized in that, y3∈[0, r], where r is the radius of the semi-circular through hole.

5. The throttle valve core according to claim 4, characterized in that, The first hole segment, the second hole segment, and the third hole segment form a shield-shaped through hole.

6. The throttle valve core according to claim 5, characterized in that, The total height of the valve hole is a preset height; the total width of the valve hole is a preset width.

7. The throttle valve core according to claim 1, characterized in that, The valve core body has a plate-like structure.

8. A novel straight-through flat throttle valve, comprising a valve core, characterized in that, The valve core is the throttle valve core according to any one of claims 1-7; the novel straight-through flat throttle valve further includes a valve body, valve stem, upper flange, upper sleeve, clamping nut, valve seat, guide rod, lower flange and lower sleeve, the valve body is cylindrical and long, and the interior of the valve body has a flow channel that runs through it along its length, and the throttle valve core is vertically arranged in the middle of the flow channel; The valve stem is disposed on the top of the throttle valve core and is fixedly connected to the first slot; The guide rod is disposed at the bottom of the throttle valve core and is connected to the second slot; The upper flange has an upper through hole for the valve stem to pass through; The lower flange has a lower through hole for accommodating the guide rod. The clamping nut is located at the top of the valve stem; A one-way valve is provided on the side of the upper flange, and the one-way valve is used to relieve the pressure inside the valve body; The valve stem is provided with a reverse sealing surface that abuts against the inner wall of the upper flange; The valve seat is fitted with the throttle valve core, and a wave spring is provided between the outer side of the valve seat and the valve body; The upper sheath is disposed on the outside of the valve stem; the lower sheath is disposed on the outside of the guide rod.

9. The novel straight-through flat plate throttle valve according to claim 8, characterized in that, In the initial state, the throttle valve core descends to abut against the lower flange, and the valve core body closes the flow passage; In operation, the throttle valve core rises to the point where it connects with the valve orifice and the flow passage, thereby adjusting the flow cross-section of the flow passage.

10. The novel straight-through flat plate throttle valve according to claim 9, characterized in that, The flow channel includes an inflow channel and an outflow channel. Both the inflow channel and the outflow channel are straight-through channels, and the angle between the inflow channel and the outflow channel is 180 degrees.

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