A throttle stop valve

Abstract

The utility model discloses a throttling stop valve, including the valve body, the flange is bolted to the valve body top, the valve bushing is embedded in the inside center of valve body, and the valve bushing is the cylindrical central control shape structure, and the vertical fixed connecting rod of flange top is equipped with, and the same thread seat is threadedly connected to the fixed connecting rod top, and the valve rod is vertically screwed with the thread seat, and the valve rod outer circumferential surface is equipped with the thread part for the interaction with thread seat, and the cage throttling bushing is coaxially arranged with the valve rod bottom end extension to the inside one end of valve body, and the valve rod top end is coaxially equipped with the adjusting wheel, and the new throttling stop valve innovation design, through multistage throttling structure, contain oblique throttling micropore, level and spiral flow guide groove, realize fine throttling, and inhibit cavitation. Adopt the cooperation of sealing cone surface and sealing ring, ensure reliable sealing under high pressure, complex medium. Through the practice verification, the valve effectively overcomes the traditional defect, and promotes the industry to efficient, safe, environmental protection advances.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a throttling shut-off valve. Background Technology

[0002] In the field of industrial fluid control, throttling valves are extremely critical devices, widely used in industries such as petroleum, chemical, and power, bearing the heavy responsibility of accurately regulating flow and reliably cutting off fluid flow. However, traditional throttling valves have revealed many problems that urgently need to be solved in actual operation.

[0003] Traditional throttling valves often employ a single-stage throttling structure, such as a simple orifice plate or valve core for direct throttling. This results in significant pressure fluctuations as the medium flows through, making precise flow regulation difficult. In applications requiring precise flow control, such as raw material transport in chemical reactions, traditional valves cannot stably maintain the medium's flow rate and pressure, leading to fluctuations in the reaction process and impacting product quality and production efficiency. Furthermore, such rapid pressure changes easily trigger cavitation. The bubbles generated by cavitation burst in high-pressure areas, severely corroding internal valve components, significantly shortening the valve's lifespan, and increasing maintenance costs and downtime.

[0004] Traditional valve sealing structures exhibit significant sealing defects when facing high pressure, high temperature, and highly corrosive media. For example, some valves using planar seals are prone to leakage under high pressure conditions due to uneven pressure; and in high-temperature environments, the performance of the sealing material deteriorates, leading to seal failure. Especially in oil extraction and transportation, the crude oil being transported often contains corrosive substances, making it difficult for traditional sealing structures to maintain good sealing performance over long periods. Once leakage occurs, it not only wastes resources but may also cause safety accidents and environmental pollution.

[0005] As industrial production develops towards higher efficiency, safety, and environmental protection, higher demands are placed on the performance of throttling valves. Developing a new type of throttling valve that can overcome the shortcomings of traditional valves and achieve precise throttling, reliable sealing, and convenient installation and commissioning has become an urgent need for the industry. Against this backdrop, the new type of throttling valve introduced in this article has emerged. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings of existing technologies by proposing a throttling shut-off valve.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A throttling shut-off valve includes a valve body, a flange bolted to the top of the valve body, a valve sleeve embedded in the center of the valve body, the valve sleeve being a cylindrical central control structure, multiple fixed connecting rods vertically arranged on the top of the flange, the top of the fixed connecting rods being threaded to the same threaded seat, the threaded seat being vertically threaded to a valve stem, the outer circumference of the valve stem having a threaded portion for interacting with the threaded seat, a cage-shaped throttling sleeve coaxially arranged at one end of the valve stem extending into the valve body, an adjusting wheel coaxially arranged at the top of the valve stem, the cage-shaped throttling sleeve and the valve sleeve being located on the same axis, the lower half of the cage-shaped throttling sleeve being a cylindrical hollow structure, the cage-shaped throttling... The lower end of the cage-shaped throttling sleeve has a number of throttling micro-holes arranged in an equal array. A horizontal guide groove is provided on the outer circumference of the lower end of the cage-shaped throttling sleeve, which is connected to the throttling micro-holes. A spiral guide groove is provided on the upper part of the horizontal guide groove, which is connected to the starting end of the spiral guide groove. A number of triangular teeth are evenly distributed on the inner wall of the spiral guide groove. The upper side wall of the cage-shaped throttling sleeve and the upper inner side wall of the valve sleeve are provided with sealing cone surfaces to prevent water flow. A sealing groove is also provided on the upper outer circumference of the cage-shaped throttling sleeve, and a sealing ring is detachably installed inside the sealing groove.

[0009] Furthermore, the number of throttling micropores is 24.

[0010] Furthermore, the throttling micropores are distributed at a 45° angle to guide the medium to form a jet.

[0011] Furthermore, the throttling micropores are an array of micropores with a diameter of 3 mm.

[0012] Furthermore, the spiral guide groove has a depth of 1.5 mm.

[0013] Furthermore, the triangular teeth have a tooth height of 0.5 mm and an angle of 60°, which are used to enhance the turbulence effect.

[0014] Preferably, the valve body has an inlet and an outlet at both ends, with the bottom opening of the cage-shaped throttling sleeve facing the inlet end of the inner cavity.

[0015] The beneficial effects of this utility model are as follows:

[0016] 1. Through 24 throttling micro-orifices with a diameter of 3mm and an oblique angle of 45°, combined with horizontal guide grooves and spiral guide grooves with triangular teeth on the inner wall, multi-stage throttling and pressure reduction are achieved. This makes the changes in medium flow velocity and pressure gradual, which not only effectively reduces flow velocity and pressure, but also reduces the occurrence of cavitation, and achieves precise micro-flow control.

[0017] 2. When the valve is closed, the sealing cone surface on the upper part of the cage-shaped throttling sleeve fits tightly with the sealing cone surface on the upper part of the valve sleeve, blocking the medium passage. The sealing ring in the sealing groove further enhances the sealing effect and prevents medium leakage, ensuring valve sealing even under high pressure conditions.

[0018] 3. Multi-stage throttling ensures smooth changes in medium velocity and pressure, preventing sharp pressure drops and sudden velocity changes, thus reducing cavitation. The spiral guide groove creates a stable flow field as the medium rotates, buffering the impact of the medium. The cage-shaped throttling sleeve structure is elastic, absorbing some impact energy and reducing vibration. Good sealing performance prevents medium leakage, maintains stable internal valve pressure, and avoids cavitation and vibration caused by abnormal changes in local velocity and pressure due to leakage.

[0019] 4. The valve body is connected to the pipeline by welding or flange, which is convenient for installation; the assembly method of each component is clear, and the assembly process has strict operating requirements and testing methods, such as the interference fit between the valve sleeve and the valve body, and the coaxial fixation between the cage-shaped throttling sleeve and the valve stem; the commissioning and testing process after installation is complete, including pressure testing, checking the flexibility of valve stem lifting, observing the flow regulation effect and testing the sealing performance, to ensure the quality of valve installation and normal operation.

[0020] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of a throttling shut-off valve proposed in this utility model;

[0022] Figure 2 This is a schematic diagram of the internal cross-sectional structure of a throttling shut-off valve proposed in this utility model;

[0023] Figure 3 This is a schematic diagram of the internal cross-sectional structure of the cage-shaped throttling sleeve of the throttling shut-off valve proposed in this utility model.

[0024] Figure 4 This is a schematic diagram of the external three-dimensional structure of the cage-shaped throttling sleeve of the throttling shut-off valve proposed in this utility model.

[0025] In the diagram: 1. Valve body; 2. Valve sleeve; 3. Flange; 4. Fixed connecting rod; 5. Threaded seat; 6. Valve stem; 7. Adjusting wheel; 8. Threaded part; 9. Inlet; 10. Outlet; 11. Cage-shaped throttling sleeve; 111. Throttling micro-orifice; 112. Horizontal guide groove; 113. Spiral guide groove; 114. Triangular tooth; 115. Sealing groove; 116. Sealing cone surface; 12. Sealing ring. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0027] Example 1

[0028] Reference Figures 1 to 4

[0029] A throttling shut-off valve

[0030] (I) Installation of valve body and connecting parts

[0031] As the main frame of the entire valve, the valve body 1 must ensure that its inlet 9 and outlet 10 are accurately connected to the corresponding pipelines during actual installation. Welding or flange connections should be used to ensure a tight seal at the joints and prevent media leakage.

[0032] The top of the valve body 1 is tightly connected to the flange 3 by matching bolts. The bolts should be tightened to the specified torque to ensure connection strength. Multiple fixed connecting rods 4 are vertically installed on the top of the flange 3. Their installation positions need to be accurately measured to ensure that the threaded seat 5 is in a horizontal state after installation, so as to prevent the valve stem 6 from tilting during the raising and lowering process.

[0033] Apply an appropriate amount of threadlocker to the threaded connection between the threaded seat 5 and the fixed connecting rod 4 to prevent loosening. The threaded portion 8 of the valve stem 6 should be screwed onto the threaded seat 5, maintaining a perpendicular position during the screwing process to avoid damaging the threads. After installation, rotate the adjusting wheel 7 to check if the valve stem 6 can move smoothly up and down.

[0034] (II) Valve sleeve and cage-type throttling sleeve assembly

[0035] The valve sleeve 2 is fitted into the center of the valve body 1 with an interference fit. Before assembly, the mating surfaces of the valve sleeve 2 and the valve body 1 need to be cleaned and lubricated. A special tool is used to slowly press the valve sleeve 2 into the valve body 1 to ensure that its coaxiality error with the valve body 1 is within the allowable range.

[0036] The cage-shaped throttling sleeve 11 is installed at the bottom end of the valve stem 6 and is coaxially fixed to the valve stem 6 by welding or keying, ensuring that the cage-shaped throttling sleeve 11 can move synchronously during the raising and lowering of the valve stem 6. During installation, special attention should be paid to aligning the cage-shaped throttling sleeve 11 with the axis of the valve sleeve 2.

[0037] The sealing ring 12 is installed in the sealing groove 115 on the upper part of the cage-shaped throttling sleeve 11. The sealing ring 12 should be made of a material that is compatible with the working medium and temperature. For example, fluororubber is suitable for high-temperature and highly corrosive media. During installation, ensure that the sealing ring 12 is intact and undamaged, and is evenly embedded in the sealing groove 115.

[0038] (III) Overall Debugging and Testing

[0039] After valve installation, a pressure test is performed. Water or other simulated working media at a certain pressure is injected into valve body 1 to check for leaks at all valve connections. The pressure value for the pressure test should be set according to the valve's design pressure rating, generally 1.5 times the design pressure.

[0040] During the commissioning process, rotate the adjusting wheel 7 to check whether the valve stem 6 rises and falls flexibly, and whether the cage-shaped throttling sleeve 11 rubs or collides with the valve sleeve 2 during movement. At the same time, observe the flow regulation effect of the valve at different opening degrees, which can be measured by a flow meter installed on the pipeline.

[0041] The sealing performance of the valve is tested. When the valve is closed, the design pressure is applied to the inlet 9 and the leakage at the outlet 10 is tested. The leakage should meet the relevant standard requirements.

[0042] Working principle:

[0043] (I) Throttling Principle

[0044] When the valve is in throttling mode, the medium flows into the valve body 1 from the inlet 9. Since the bottom opening of the cage-shaped throttling sleeve 11 faces the inlet 9, the medium first enters the interior of the cage-shaped throttling sleeve 11.

[0045] The 24 throttling micro-orifices 111, each 3 mm in diameter and angled at 45° at the lower end of the cage-shaped throttling sleeve 11, begin to function. When the medium passes through these micro-orifices, the flow velocity increases instantaneously, and according to Bernoulli's principle, the pressure decreases, achieving initial throttling and pressure reduction. Simultaneously, the angled distribution of the micro-orifices causes the medium to form a rotating jet, and the rotating medium enters the horizontal guide channel 112.

[0046] The horizontal guide channel 112 guides the rotating jet to the spiral guide channel 113. The spiral guide channel 113 has a depth of 1.5 mm, and the triangular teeth 114 on its inner wall have a tooth height of 0.5 mm and an angle of 60° to further enhance the turbulence effect. The turbulence causes the energy of the medium to be continuously consumed, the flow velocity to be reduced, and the pressure to be distributed more evenly, thereby achieving more precise throttling control, effectively reducing the flow velocity and pressure of the medium, and reducing the possibility of cavitation.

[0047] (II) Cutoff Principle

[0048] When it is necessary to close the valve, the operator rotates the adjusting wheel 7. The adjusting wheel 7 is coaxially connected to the valve stem 6, and rotating the adjusting wheel 7 causes the valve stem 6 to move downward.

[0049] The valve stem 6 drives the cage-shaped throttling sleeve 11 to move downward synchronously. When the sealing cone surface 116 on the upper part of the cage-shaped throttling sleeve 11 is tightly fitted with the sealing cone surface 116 on the upper part of the valve sleeve 2, the medium passage is completely blocked, and the shut-off function is achieved.

[0050] At this point, the sealing ring 12 inside the sealing groove 115 of the cage-shaped throttling sleeve 11 further enhances the sealing effect and prevents media leakage. Even under high-pressure conditions, the sealing ring 12 can fill any tiny gaps that may exist on the sealing cone surface 116 through its own elastic deformation, ensuring the valve's sealing performance.

[0051] (III) Principles of Cavitation and Vibration Suppression

[0052] Throttling suppresses cavitation and vibration: Through the multi-stage throttling effect of the throttling micro-orifice 111, horizontal guide groove 112, and spiral guide groove 113, the changes in medium velocity and pressure are more gradual, avoiding sharp drops in pressure and sudden changes in flow velocity, thereby effectively suppressing cavitation. At the same time, the turbulence effect disperses the energy of the medium, reducing vibration caused by medium impact.

[0053] Buffering and suppressing cavitation and vibration: The spiral guide groove 113 causes the medium to rotate, and the rotating medium forms a relatively stable flow field, which buffers the impact of the medium. In addition, the cage-shaped throttling sleeve 11 has a certain degree of elasticity, which can absorb part of the energy of the medium impact and further reduce vibration.

[0054] Sealing suppresses cavitation and vibration: The sealing cone 116 and the sealing ring 12 work together to prevent media leakage. Leakage can cause abnormal changes in local flow velocity and pressure, leading to cavitation and vibration. By ensuring the valve's sealing performance, the internal pressure of the valve is kept stable, thereby suppressing cavitation and vibration.

[0055] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A throttling shut-off valve, comprising a valve body (1), a flange (3) bolted to the top of the valve body (1), a valve sleeve (2) embedded in the center of the valve body (1), the valve sleeve (2) being a cylindrical central control structure, multiple fixed connecting rods (4) vertically arranged on the top of the flange (3), the top of the fixed connecting rods (4) being threadedly fixed to the same threaded seat (5), the threaded seat (5) being vertically threadedly connected to a valve stem (6), the outer circumferential surface of the valve stem (6) being provided with a threaded portion (8) for interacting with the threaded seat (5), the bottom end of the valve stem (6) extending into the interior of the valve body (1) being coaxially provided with a cage-shaped throttling sleeve (11), and the top end of the valve stem (6) being coaxially provided with an adjusting wheel (7), characterized in that, The cage-shaped throttling sleeve (11) and the valve sleeve (2) are located on the same axis. The lower half of the cage-shaped throttling sleeve (11) is a hollow cylindrical structure. A number of throttling micro-holes (111) are evenly spaced at the lower end of the cage-shaped throttling sleeve (11). A horizontal guide groove (112) is formed on the outer circumference of the lower end of the cage-shaped throttling sleeve (11). The horizontal guide groove (112) is connected to the throttling micro-holes (111). A spiral guide groove is formed at the upper part of the cage-shaped throttling sleeve (11). (113) The horizontal guide channel (112) is connected to the starting end of the spiral guide channel (113). The inner wall of the spiral guide channel (113) is evenly distributed with a number of triangular teeth (114). The upper side wall of the cage-shaped throttling sleeve (11) and the upper inner side wall of the valve sleeve (2) are provided with sealing cone surfaces (116) for preventing water flow. The upper outer circumferential surface of the cage-shaped throttling sleeve (11) is also provided with a sealing groove (115). A sealing ring (12) is detachably installed inside the sealing groove (115).

2. A throttling shut-off valve according to claim 1, characterized in that, The number of throttling micropores (111) is 24.

3. A throttling shut-off valve according to claim 1, characterized in that, The throttling micropores (111) are distributed at a 45° angle to guide the medium to form a jet.

4. A throttling shut-off valve according to claim 1, characterized in that, The throttling micropores (111) are an array of micropores with a diameter of 3 mm.

5. A throttling shut-off valve according to claim 1, characterized in that, The spiral guide groove (113) has a groove depth of 1.5 mm.

6. A throttling shut-off valve according to claim 1, characterized in that, The triangular tooth (114) has a tooth height of 0.5 mm and an angle of 60°, and is used to enhance the turbulence effect.

7. A throttling shut-off valve according to claim 1, characterized in that, The valve body (1) has an inlet (9) and an outlet (10) at both ends, and the bottom opening of the cage-shaped throttling sleeve (11) faces the inner cavity of the inlet (9).

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