A linkage type anti-erosion device for a gate valve

Abstract

A kind of linkage type anti-erosion device for gate valve, linkage unit is installed on the valve stem of gate valve and follows the valve stem synchronous opening and closing during the opening and closing of valve;Valve inlet flow passage bottom is grooved, and the one end of anti-erosion flow guide is placed in the groove, and the other end is sealed through the valve inlet flow passage;The end of the other end is connected with the one end of two lever mechanisms respectively, the other end of lever mechanism is provided with track groove, linkage piece press block is installed in track groove, and linkage piece press block lower part is provided with linkage piece energy storage element;Valve runs to the preset opening from full open position to closing direction, and the one end of anti-erosion flow guide is completely in the groove at the bottom of valve inlet flow passage, and linkage piece press block is at the top end of track groove;When reaching the preset opening, valve stem drives linkage unit to act on the linkage piece press block, and anti-erosion flow guide gradually extends from the groove under the action of lever mechanism, and from the preset opening to valve closing, anti-erosion flow guide is always in the state of extending from valve inlet flow passage.

Description

Technical Field

[0001] This invention belongs to the field of industrial valve technology, specifically relating to a double gate valve for fluid media containing solid particles, and more particularly to a gate valve that uses the valve's own opening and closing action to drive the extension or retraction of an anti-erosion device. Background Technology

[0002] In process industries such as petrochemicals and coal chemicals, many process media contain solid particulate impurities. For example, in ethylene and catalytic cracking units, cracked gas valves and catalyst valves need to pass through oil and gas media containing solid powder at high temperatures for extended periods. Erosion damage to these valves is a critical limiting factor for the safe operation of the unit. Existing academic research shows that erosion damage caused by particulate fluids inside valves seriously threatens the long-term operation of the equipment.

[0003] Double-gate valves are widely used in pipeline systems containing solid media due to their simple structure, low flow resistance, and unchanging flow direction. However, these valves exhibit severe erosion and wear problems in practical applications. Analysis of valve failures in the field reveals that most gate valve failures are caused by severe wear of the gate due to erosion, affecting the valve's sealing performance and ultimately rendering it unusable, directly impacting the safe and normal operation of the plant.

[0004] The core mechanism of the problem lies in the following: When the valve begins to open from the fully closed state, a small channel is initially formed between the valve's guide orifice and the outlet cross-section of the valve body's inlet flow channel. Driven by the high pressure difference between the valve's inlet and outlet, particulate fluid is ejected from this tiny channel at extremely high speed, forming a powerful jet. This high-speed jet of particulate fluid directly impacts the valve seat sealing surface on the valve outlet side, causing severe localized erosion and wear on the sealing surface within a short period. Once the sealing surface is damaged, an effective seal cannot be formed when the valve is closed, resulting in internal leakage. As internal leakage persists, the leakage channel further expands under the continuous abrasion of particles, forming a vicious cycle of "erosion—internal leakage—intensified erosion."

[0005] To address the aforementioned erosion problem, existing technologies have primarily attempted to address it from the following aspects: The first category involves improving the erosion resistance of materials. For example, replacing Stellite alloys with wear-resistant materials such as chromium carbide or tungsten carbide. Some erosion-resistant control valves use chromium carbide or tungsten carbide for both the valve body and valve core to combat the erosion of high-speed flowing media containing highly abrasive fine particles. However, this approach has a fundamental flaw: it can only passively resist erosion and cannot change the hydrodynamic conditions under which erosion occurs. Any wear-resistant material will eventually wear down under prolonged high-speed particle impact, and the manufacturing cost of high-performance wear-resistant materials is extremely high, making widespread use in industrial valves difficult.

[0006] The second type involves installing fixed guiding or blocking structures in the valve plate or flow channel. This type of solution improves hydrodynamic conditions by altering the local flow channel morphology. For example, a baffle is used to forcibly change the fluid direction to prevent the particulate jet from directly impacting the outlet sealing surface, or an anti-erosion device is installed at the bottom of the flow channel. However, since the baffle itself is an obstacle in the fluid, it causes continuous fluid impact and eddies, resulting not only in significant pressure loss but also in the continuous scouring of the baffle by the high-speed particulate fluid, becoming a new vulnerable point. The anti-erosion guide is a fixed structure, meaning it is permanently fixed in a certain position in the flow channel once installed. This presents a fundamental contradiction: at small openings, the anti-erosion guide needs sufficient radial height to effectively shield the sealing surface from jet impact; however, the greater the radial height, the greater the obstruction to the main fluid flow in the fully open state, causing permanent pressure loss. This fixed structure cannot achieve this adaptive adjustment. Furthermore, continuous high-speed fluid scouring may cause the anti-erosion guide to detach, causing valve jamming, and in severe cases, production shutdown.

[0007] Therefore, there is an urgent need to propose a completely new technical approach: the anti-erosion guide only works at the small opening stage where protection is needed, and can completely exit the flow channel after the valve is opened to a certain extent, thereby achieving both excellent anti-erosion performance and full-bore, low-flow-resistance flow characteristics. Summary of the Invention

[0008] The technical problem solved by this invention is to overcome the shortcomings of existing fixed flow guiding devices in that they cannot balance erosion prevention and flow efficiency. This invention provides a retractable, interlocking erosion prevention device that requires no external power.

[0009] The technical solution of the present invention is: a linkage-type anti-erosion device for gate valves, comprising a linkage unit, a lever mechanism, an anti-erosion guide component, a linkage component pressure block, and a linkage component energy storage element; The linkage unit is installed on the valve stem of the gate valve and opens and closes synchronously with the valve stem during the valve opening and closing process; the bottom of the valve inlet flow channel is slotted, one end of the anti-erosion guide is placed in the slot, and the other end is sealed and passes through the valve inlet flow channel; the ends of the anti-erosion guide passing through the valve inlet flow channel are respectively connected to one end of two lever mechanisms, and the other end of the two lever mechanisms is provided with a track groove. The linkage pressure block is installed in the track groove, and the linkage energy storage element is provided at the bottom of the linkage pressure block; Before the valve moves from the fully open position to the closed position to the preset opening degree, one end of the anti-erosion guide is completely in the bottom groove of the valve inlet flow channel, and the linkage block is at the top of the track groove. When the preset opening degree is reached, the valve stem drives the linkage unit to act on the linkage block. Under the action of the lever mechanism, the anti-erosion guide gradually extends out of the groove. From the preset opening degree to the valve closing, the anti-erosion guide is always in the state of extending out of the valve inlet flow channel.

[0010] Preferably, the anti-erosion guide includes a guide, a guide rod, and a guide support plate. The guide and the guide rod are connected and placed in the bottom groove of the valve inlet flow channel. The guide rod passes through the valve inlet flow channel and is sealed. The other end of the guide rod is equipped with the guide support plate. An energy storage element is provided between the seal and the guide support plate. The guide, the guide rod, and the guide support plate are connected by a threaded detachable connection.

[0011] Preferably, the bottom and circumferential surfaces of the flow guide are square planes, and the top is a funnel-shaped conical arc-shaped baffle with the small end facing the incoming flow direction and the large end facing the valve seat side, so that the high-speed jet can only flow around the top of the baffle and block part of the flow channel area, thereby changing the jet direction at the outlet flow channel end.

[0012] Preferably, the structural dimensions of the flow guide are as follows:

[0013]

[0014] Where h is the height of the guide on the anti-erosion guide; θ is the radian of the central angle of the flow channel circle corresponding to the width of the guide; and D is the diameter of the valve flow channel.

[0015] Preferably, the lever mechanism includes a linkage bracket shaft and a linkage; the linkage is mounted on the linkage bracket via the linkage bracket shaft, and the two ends of the linkage rod are open U-shaped structures. One end of the U-shaped structure is movably connected to the guide support plate via the guide shaft, and the other end of the U-shaped structure of the linkage rod is provided with the same track groove. The two ends of the linkage rod pressure block are placed in the two track grooves, and the linkage energy storage element is installed in the lower center of the linkage rod pressure block, while the upper part is the working part of the linkage unit.

[0016] Preferably, the linkage energy storage unit and the guide energy storage element are cylindrical springs, disc springs or other energy storage structures.

[0017] Preferably, the curve of the track groove satisfies a non-linear relationship between the extension ratio of the anti-erosion guide and the valve opening.

[0018] Preferably, the equation for the track groove is:

[0019] The center of the rotating shaft of the linkage bracket is point O (0,0); , These represent the horizontal and vertical distances from the trajectory to point O, respectively. γ0 is the initial phase angle between the linkage and the linkage block, in °; r is the length from point O to the linkage pressure block, in mm; β is the rotation angle of the linkage about point O, in degrees; The linear displacement of the linkage block along the guide rail is expressed in mm. (β) = r[cos(γ0-β)-cosγ0].

[0020] Preferably, the preset opening is 5%, and the extension begins at 5%, with the extension speed satisfying a relative relationship of first extending quickly, then slowly, and then maintaining the position.

[0021] Preferably, the equation relating the extension amount and the turning angle of the anti-erosion guide is as follows:

[0022]

[0023]

[0024]

[0025]

[0026]

[0027]

[0028]

[0029] Among them, s max To determine the maximum extension of the guide vane for erosion prevention, β max To achieve s max The rotation angle of the linkage block is °; x is the linear displacement of the linkage block along the guide rail; L is the effective stroke of the linkage block, mm; β is the rotation angle of the linkage around the center point O of the linkage bracket axis, °. Take 2.5 ± 0.5. Take -5 ± 0.6, Take 0±0.3.

[0030] Preferably, the linkage unit includes a connecting block, a connecting frame, a pressure rod, a guide rod, and a guide bracket; The connecting block is set on the valve stem, and a connecting frame is set on the connecting block. Pressure rods and guide rods are symmetrically set at both ends of the connecting frame. The pressure rods and guide rods pass through the valve bracket respectively. A guide bracket is set at the valve bracket for guiding the pressure rods. The end of the pressure rod is used for the action of the linkage pressure block to realize the extension of the anti-erosion guide.

[0031] A gate valve includes: a valve stem, a valve body, and a linkage-type anti-erosion device for the gate valve.

[0032] The advantages of this invention compared to the prior art are: (1) The present invention automatically extends during the small opening stage of the valve, effectively blocking the direct impact of high-speed jet containing particles on the sealing surface of the outlet valve seat; after the valve is opened to a certain degree, it automatically retracts completely into the valve body, restoring the full flow path. The present invention achieves a perfect balance between anti-erosion performance and flow efficiency, significantly improving the service life and operational reliability of the gate valve in media containing solid particles.

[0033] (2) Possesses nonlinear control capability By using the curved design of the track groove, the nonlinear relationship between the extension ratio of the guide component and the valve opening can be precisely controlled, thereby achieving fine control of fluid dynamics, erosion protection of the gate valve outlet seat at small openings, extending the service life of the outlet valve seat and sealing surface by more than 5 times, reducing leakage risk, and improving the safety and reliability of the entire pipeline system. (3) Dynamism and Adaptability Existing technology uses a static protection structure that is always located in the flow channel, resulting in permanent pressure loss. This invention is a dynamic structure that intervenes only when needed and automatically withdraws after completing the protection. The linkage design can achieve erosion prevention at small openings and automatic retraction at large openings to ensure flow efficiency. It can be widely applied to parallel double gate valves of different diameters. (4) No external power is required, achieving intrinsic safety and zero energy consumption. In existing technologies, achieving a scalable structure typically requires electric, pneumatic, or hydraulic drive, which increases system complexity and potential failure points. This invention requires no external power and is driven entirely by the mechanical movement of the valve itself, eliminating the risk of failure due to external power source failure or improper explosion-proof treatment, and also consumes no operating energy. (5) The flow channel is truly unobstructed, without sacrificing flow capacity. The anti-erosion guide is completely retracted into the valve body, maintaining the full diameter of the flow channel. The flow resistance is minimal, and no additional pressure loss will be caused. The flow resistance coefficient is almost the same as that of the original valve, ensuring the system's delivery efficiency. (6) Wear parts can be replaced in a modular fashion, resulting in extremely low maintenance costs. The anti-erosion guide component is made of replaceable wear-resistant material and can be replaced individually after erosion, without having to replace the entire valve or valve plate, which significantly reduces maintenance costs and downtime. (7) Zero delay in action response and strict synchronization of protection. The protective action is strictly synchronized with the valve opening and closing, and the response is rapid. Any response lag caused by electrical signals or hydraulic transmission avoids protection failure due to control system delay. (8) Minimal modifications are required to existing valves, making it highly adaptable to modification. With its compact structure and all motion mechanisms integrated inside the valve body or valve plate, it does not affect the original installation dimensions and connection standards of the valve, making it ideal for erosion-resistant retrofitting and upgrading of a large number of existing in-service gate valves. (9) The difficulty of designing a simplified linkage system for energy storage mechanisms By relying on energy storage elements, the anti-erosion guide can automatically fall back, eliminating the need for a structure that uses a cam or other mechanism to drive the anti-erosion guide back, greatly simplifying the design difficulty of the linkage system. (10) Multiple guide structures prevent jamming during movement It has multiple guiding structures to prevent the anti-erosion guides and pressure rods from getting stuck during extension and movement, thus affecting the smooth opening and closing of the valve. Attached Figure Description

[0034] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A schematic diagram of a valve equipped with a linkage anti-erosion device; Figure 2 A schematic cross-sectional view of the valve-closed erosion protection device. Figure 3 A schematic cross-sectional view of the location of the interlocking anti-erosion device when the valve is at a small opening. Figure 4 A schematic cross-sectional view of the valve-open-position linkage anti-erosion device. Figure 5 A partial schematic diagram of a valve support equipped with a linkage-type anti-erosion device; Figure 6 A partial schematic diagram of the valve flow channel equipped with a linkage-type anti-erosion device; Figure 7 A partial schematic diagram of a valve-closed erosion protection device; Figure 8 A partial schematic diagram of a valve-operated anti-erosion device in the open position. Figure 9 A schematic diagram of the erosion-preventing guide structure. Detailed Implementation

[0035] To better understand the above technical solutions, the technical solutions of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present invention and the specific features in the embodiments are detailed descriptions of the technical solutions of the present invention, rather than limitations on the technical solutions of the present invention. In the absence of conflict, the embodiments of the present invention and the technical features in the embodiments can be combined with each other.

[0036] Figure 5 and Figure 6 These two diagrams, a partial schematic of the valve support and a partial schematic of the valve flow channel for installing the linkage-type anti-erosion device, facilitate understanding of the technical implementation of the present invention. A connecting block 101 is provided at the valve stem 2, and a connecting frame 102 is provided on the connecting block 101. Two pressure rods 103 and guide rods 104 are symmetrically arranged at both ends of the connecting frame 102. The connecting block 101, connecting frame 102, pressure rods 103, and guide rods 104 all open and close synchronously with the valve stem 2 during the valve opening and closing process. A guide bracket 105 is provided at the valve support for guiding the pressure rods 103.

[0037] The bottom of the valve inlet flow channel 1.1 is grooved, with the groove depth matching the highest point of the anti-erosion guide 201, ensuring that the guide of the anti-erosion guide 201 can be completely retracted into the inlet flow channel 1.1. The anti-erosion guide 201 consists of a guide 201.1, a guide connecting rod 201.2, and a guide support plate 201.3. Figure 9 The system consists of three components, all of which are threaded and detachable. The anti-erosion guide 201 is installed in the bottom groove of the valve inlet flow channel 1.1. The guide rod passes through the guide sealing system 300. An energy storage element 202 is provided between the guide sealing system 300 and the guide support plate. This energy storage element can be a cylindrical spring, a butterfly spring, or other energy storage structure. Its purpose is to allow the guide to retract into the valve body. The guide support plate is movably connected to one end of the linkage 203 via the guide shaft 208. The middle of the linkage 203 is fixed to the linkage bracket 106 via the linkage bracket shaft 207 (the linkage bracket is directly welded to the valve body rib plate) and can freely rotate around the linkage bracket shaft 207. A linkage track groove is provided on the other side of the linkage 203. The curve trajectory of the track groove is calculated based on the actual valve opening and the shielding area of ​​the anti-erosion guide. The linkage pressure block 205 is installed in the linkage track groove, and the linkage energy storage element 204 is provided at its lower part.

[0038] The flow guide has a square plane on its bottom and circumferential surfaces, and a flared, conical-shaped baffle on top, with the smaller end facing the incoming flow direction and the larger end facing the valve seat. This allows the high-speed jet to flow around the baffle from above and partially blocks the flow channel area, thereby changing the jet direction at the outlet flow channel end. The flow guide is made of high-hardness, high-wear-resistant material, typically age-hardened precipitation-hardened stainless steel, with a cobalt-based high-temperature hard alloy welded to its surface.

[0039] The structural dimensions of the guide vane on the erosion-resistant guide are as follows:

[0040]

[0041] Where h is the height of the guide on the anti-erosion guide; θ is the radian of the central angle of the flow channel circle corresponding to the width of the guide; and D is the diameter of the valve flow channel. The kinematic relationship between the track groove and the anti-erosion guide component is calculated as follows: Assume the central axis of rotation of the linkage is point O (0,0); a is the horizontal distance (mm) from point O to the anti-erosion guide. b is the vertical distance (positive downward) from point O to the anti-erosion guide component in mm; R is the length from point O to the guide vane on the erosion-resistant guide component, in mm. ; α is the initial phase angle between the linkage and the guide vane on the erosion-resistant guide, in °. ; β is the rotation angle of the linkage about point O, in degrees; s(β) is the vertical displacement of the anti-erosion guide relative to its initial position, in mm; s max The maximum extension of the guide vane to prevent erosion of the guide vane. mm; △ represents the safety margin for overextension, typically taken as D / 200 mm; r is the length from point O to the linkage pressure block, in mm; γ0 is the initial phase angle between the linkage and the linkage block, in °; x is the linear displacement of the linkage block along the guide rail, mm, x(β) = r[cos(γ0-β)-cosγ0]; L represents the effective stroke of the linkage block, in mm; β max To achieve s max The rotation angle of the linkage block, °, β max = α-arcsin(sinα-s max / R); τ is the normalized rotation angle, τ = β / β max ; The equation relating the extension and angle of the erosion-resistant guide is as follows:

[0042]

[0043]

[0044]

[0045]

[0046]

[0047]

[0048]

[0049] in, Take 2.5 ± 0.5. Take -5 ± 0.6, Take 0 ± 0.3; The equation for the track groove is:

[0050] like Figure 7 As shown, when the valve moves from the fully open position to a certain opening degree in the closed direction, the valve stem 2 drives the connecting block 101, connecting frame 102, and pressure rod 103 to move downwards synchronously. At this time, the pressure rod 103 has not yet acted on the linkage pressure block 205, and the linkage pressure block 205 is at the top of the linkage track groove under the action of the rebound force of the linkage energy storage element 204. At this time, the anti-erosion guide 201 is completely retracted inside the valve body inlet flow channel 1.1 under the action of the rebound force of the guide energy storage element 202, which does not affect the normal flow performance of the valve. The aforementioned certain opening degree is 5%. It starts to extend at 5%, and the extension speed is controlled according to the relative relationship of fast extension first, slow extension then holding.

[0051] like Figure 8 As shown, when the pressure rod 103 moves downwards and presses against the linkage block 205, the linkage block 205 moves along the linkage track groove and continuously compresses the linkage energy storage element 204. The linkage 203, the linkage support shaft 207, and the anti-erosion guide 201 form a simple lever mechanism, which drives the anti-erosion guide 201 to extend and compress the guide energy storage element 202. The linkage track groove achieves non-linear control of the inlet flow channel area and the outlet flow channel area, thereby reducing the outlet medium velocity and reducing the erosion of the outlet valve seat sealing surface. From the small opening to the closed state of the valve, the anti-erosion guide 201 is always extended out of the inlet flow channel 1.1. Figure 2 A cross-sectional view of the valve-closed position linkage anti-erosion device is shown below. Figure 2 As shown; a schematic cross-sectional view of the location of the interlocking anti-erosion device in the small valve opening state is shown below. Figure 3 As shown.

[0052] Similarly, when the valve is opened from the closed position to a small opening (5%), the anti-erosion guide 201 remains extended beyond the inlet flow channel 1.1. When the valve is opened to a certain extent, the anti-erosion guide 201 gradually retracts into the inlet flow channel 1.1. Subsequently, as the valve opening increases, the anti-erosion guide 201 remains entirely within the inlet flow channel 1.1, without affecting the valve's flow capacity. A schematic cross-sectional view of the valve-opening interlocking anti-erosion device is shown below. Figure 4 As shown.

[0053] The present invention further provides a valve / gate valve with interlocking erosion protection capability, such as... Figure 1 As shown, the above-mentioned interlocking anti-erosion device for gate valves is added to the basis of traditional valves.

[0054] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

[0055] The contents not described in detail in this specification are common knowledge to those skilled in the art.

Claims

1. A linkage-type anti-erosion device for gate valves, characterized in that, Includes linkage unit, lever mechanism, anti-erosion guide, linkage pressure block and linkage energy storage element; The linkage unit is installed on the valve stem of the gate valve and opens and closes synchronously with the valve stem during the valve opening and closing process; the bottom of the valve inlet flow channel is slotted, one end of the anti-erosion guide is placed in the slot, and the other end is sealed and passes through the valve inlet flow channel; the ends of the anti-erosion guide passing through the valve inlet flow channel are respectively connected to one end of two lever mechanisms, and the other end of the two lever mechanisms is provided with a track groove. The linkage pressure block is installed in the track groove, and the linkage energy storage element is provided at the bottom of the linkage pressure block; Before the valve moves from the fully open position to the closed position to the preset opening degree, one end of the anti-erosion guide is completely in the bottom groove of the valve inlet flow channel, and the linkage block is at the top of the track groove. When the preset opening degree is reached, the valve stem drives the linkage unit to act on the linkage block. Under the action of the lever mechanism, the anti-erosion guide gradually extends out of the groove. From the preset opening degree to the valve closing, the anti-erosion guide is always in the state of extending out of the valve inlet flow channel.

2. The interlocking anti-erosion device for gate valves according to claim 1, characterized in that, The erosion-resistant flow guide includes a flow guide, a flow guide connecting rod, and a flow guide support plate. The flow guide and the flow guide connecting rod are connected and placed in the bottom groove of the valve inlet flow channel. The flow guide connecting rod passes through the valve inlet flow channel and is sealed. The other end of the flow guide connecting rod is equipped with the flow guide support plate. A flow guide energy storage element is set between the seal and the flow guide support plate. The flow guide, the flow guide connecting rod, and the flow guide support plate are connected by a threaded detachable connection.

3. The interlocking anti-erosion device for gate valves according to claim 2, characterized in that, The bottom and circumferential surfaces of the flow guide are all square planes, and the top is a flared, conical arc-shaped baffle with the small end facing the incoming flow direction and the large end facing the valve seat side, so that the high-speed jet can only flow around the top of the baffle and block part of the flow channel area, thereby changing the jet direction at the outlet flow channel end.

4. The interlocking anti-erosion device for gate valves according to claim 3, characterized in that, The structural dimensions of the flow guide are as follows: Where h is the height of the guide on the anti-erosion guide; θ is the radian of the central angle of the flow channel circle corresponding to the width of the guide; and D is the diameter of the valve flow channel.

5. The interlocking anti-erosion device for gate valves according to claim 2, characterized in that, The lever mechanism includes a linkage bracket shaft and a linkage; the linkage is mounted on the linkage bracket via the linkage bracket shaft. The two ends of the linkage rod are open U-shaped structures. One end of the U-shaped structure is movably connected to the guide support plate via the guide shaft. The other end of the U-shaped structure of the linkage rod is provided with the same track groove. The two ends of the linkage rod pressure block are placed in the two track grooves. The linkage energy storage element is installed in the lower center of the linkage rod pressure block, and the upper part is the working part of the linkage unit.

6. The interlocking anti-erosion device for gate valves according to claim 5, characterized in that, The linkage energy storage unit and the flow guide energy storage element are cylindrical springs, disc springs or other energy storage structures.

7. The interlocking anti-erosion device for gate valves according to claim 1, characterized in that, The curve of the track groove satisfies the non-linear relationship between the extension ratio of the anti-erosion guide and the valve opening.

8. The interlocking anti-erosion device for gate valves according to claim 4, characterized in that, The equation for the track groove is: The center of the rotating shaft of the linkage bracket is point O (0,0); , These represent the horizontal and vertical distances from the trajectory to point O, respectively. γ0 is the initial phase angle between the linkage and the linkage block, in °; r is the length from point O to the linkage pressure block, in mm; β is the rotation angle of the linkage about point O, in degrees; The linear displacement of the linkage block along the guide rail is expressed in mm. (β) = r[cos(γ0-β)-cosγ0].

9. The interlocking anti-erosion device for gate valves according to claim 1, characterized in that, The preset opening is 5%. It starts to extend when it reaches 5%, and the extension speed satisfies the relative relationship of first extending quickly, then slowly, and then maintaining the position.

10. The interlocking anti-erosion device for gate valves according to claim 9, characterized in that, The equation relating the extension and angle of the erosion-resistant guide is as follows: Among them, s max To determine the maximum extension of the guide vane for erosion prevention, β max To achieve s max The rotation angle of the linkage block is °; x is the linear displacement of the linkage block along the guide rail; L is the effective stroke of the linkage block, mm; β is the rotation angle of the linkage around the center point O of the linkage bracket axis, °. Take 2.5 ± 0.

5. Take -5 ± 0.6, Take 0±0.

3.

11. The interlocking anti-erosion device for gate valves according to claim 1, characterized in that, The linkage unit includes a connecting block, a connecting frame, a pressure rod, a guide rod, and a guide bracket; The connecting block is set on the valve stem, and the connecting block is equipped with a connecting frame. The connecting frame is symmetrically equipped with pressure rods and guide rods at both ends. The pressure rods and guide rods pass through the valve bracket respectively. A guide bracket is set at the valve bracket for guiding the pressure rods. The end of the pressure rod is used for the action of the linkage pressure block to realize the extension of the anti-erosion guide.

12. A gate valve, characterized in that... include: Valve stem, valve body, and the interlocking anti-erosion device for gate valve as described in claim 1.

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