A pipeline valve pressure testing device

Abstract

This utility model discloses a pipeline valve pressure testing device, comprising: a main frame; a blind plate support, the blind plate support being fixedly installed at the bottom of the main frame; a lower blind plate, the lower blind plate being installed on the upper part of the blind plate support; an upper blind plate, the top of the upper blind plate being connected to a hydraulic rod, the hydraulic rod passing through the main frame; a hydraulic system, including a hydraulic cylinder and a hydraulic piston, the hydraulic piston and the hydraulic rod being fixedly connected, the hydraulic piston being used to drive the hydraulic rod to move the upper blind plate vertically; experimental instruments, connected in series on the pressure testing pipeline; a pressure relief valve, installed on the pressure testing pipeline between the experimental instruments and the pressure testing pump; sealing grooves are provided on the flange contact surfaces of both the lower and upper blind plates, and sealing material is embedded in the sealing grooves; a test valve is arranged between the lower and upper blind plates. This utility model solves the problems of poor versatility, low operating efficiency, and insufficient sealing reliability of traditional technology equipment.

Description

Technical Field

[0001] This utility model relates to a pipeline valve pressure testing device, belonging to the field of valve testing technology. Background Technology

[0002] In pressure pipeline installation projects, valve pressure testing is a crucial step in ensuring the safe operation of the system. Traditional testing methods use two flanged short sections connected to a blind flange via bolts. This requires multiple sets of specialized equipment depending on the valve size (DN25-DN350) and pressure rating (PN10-PN63), resulting in high equipment costs. This method relies on bolt tightening to achieve a seal, necessitating repeated disassembly and reassembly of numerous fasteners during operation, which is time-consuming, labor-intensive, and prone to leakage risks due to uneven stress.

[0003] The existing technology has significant drawbacks: First, the equipment has poor versatility, and valves with different parameters require independent adapters, resulting in a waste of resources; second, the operation efficiency is low, the bolt connection process is time-consuming, and the labor cost is high; third, the sealing reliability is insufficient, the traditional rigid connection is difficult to cope with high pressure conditions, the leakage rate is high, which affects the test accuracy and poses safety hazards. Summary of the Invention

[0004] Therefore, this utility model provides a pipeline valve pressure testing device to solve the problems of poor versatility, low operating efficiency, and insufficient sealing reliability of traditional technical equipment.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a pipeline valve pressure testing device, comprising:

[0006] Main framework;

[0007] Blind plate support, which is fixedly installed at the bottom of the main frame;

[0008] A lower blind flange, wherein the lower blind flange is installed on the upper part of the blind flange support;

[0009] An upper blind plate, the top of which is connected to a hydraulic rod that passes through the main frame;

[0010] The hydraulic system includes a hydraulic cylinder and a hydraulic piston, wherein the hydraulic piston and the hydraulic rod are fixedly connected, and the hydraulic piston is used to drive the hydraulic rod to move the upper blind plate in the vertical direction;

[0011] The experimental instruments are connected in series on the pressure testing pipeline;

[0012] A pressure relief valve is installed on the pressure-pressurizing pipeline between the experimental instruments and the pressure pump;

[0013] Both the lower blind flange and the upper blind flange have sealing grooves on their flange contact surfaces, and sealing material is embedded in the sealing grooves; a test valve is arranged between the lower blind flange and the upper blind flange.

[0014] As a preferred embodiment of the pipeline valve pressure testing device, the lower blind flange has a through fluid channel at its center, and the test valve is connected in sequence to the test instrument, the pressure relief valve and the pressure pump through the fluid channel and the pressure testing pipeline.

[0015] As a preferred option for pipeline valve pressure testing equipment, the sealing material is fluororubber or metal spiral wound gasket.

[0016] As a preferred option for pipeline valve pressure testing equipment, the pressure testing pipeline is also equipped with a pressure testing port.

[0017] As a preferred option for pipeline valve pressure testing equipment, the instrument used in the test is a pressure gauge.

[0018] As a preferred embodiment of the pipeline valve pressure testing device, both the lower blind plate and the upper blind plate are made of stainless steel, and the surfaces of the lower blind plate and the upper blind plate are chrome-plated.

[0019] As a preferred embodiment of the pipeline valve pressure testing device, the main frame is welded from H-beams, and the bottom of the main frame is provided with adjustable support feet.

[0020] As a preferred embodiment of the pipeline valve pressure testing device, a guide mechanism is provided between the hydraulic rod and the main frame, and the guide mechanism includes a linear bearing and a guide sleeve.

[0021] This utility model has the following advantages: It adopts a hydraulically driven movable upper blind flange structure, which can adapt to valves of different specifications and pressure levels, eliminating the need for multiple sets of devices for different valves and saving purchase costs; the hydraulic system replaces bolt connections, avoiding the cumbersome bolt disassembly and assembly process, shortening clamping time, reducing labor costs, and reducing the risk of operational errors; the upper and lower blind flanges are equipped with sealing grooves and sealing materials to achieve flexible sealing under dynamic pressure, reducing leakage rate and meeting high-pressure test requirements; experimental instruments monitor pressure and other parameters in real time, and combined with the stable driving force of the hydraulic system, ensure accurate control of test parameters; the pressure relief valve quickly releases pressure, and the guide mechanism ensures the vertical movement accuracy of the upper blind flange, avoiding the risk of seal failure due to off-center loading. Attached Figure Description

[0022] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0023] Figure 1 This is a first-view three-dimensional structural diagram of the pipeline valve pressure testing device provided in this embodiment of the utility model;

[0024] Figure 2 This is a second-view three-dimensional structural diagram of the pipeline valve pressure testing device provided in this embodiment of the utility model;

[0025] Figure 3 This is a partial schematic diagram of the pipeline valve pressure testing device provided in the embodiments of this utility model.

[0026] In the diagram, 1. Main frame; 2. Blind flange support; 3. Lower blind flange; 4. Experimental valve; 5. Upper blind flange; 6. Hydraulic rod; 7. Hydraulic system; 8. Experimental instruments; 9. Pressure relief valve; 10. Pressure testing port; 11. Fluid passage; 12. Pressure testing pipeline. Detailed Implementation

[0027] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0028] See Figure 1 , Figure 2 and Figure 3 This utility model provides a pipeline valve pressure testing device, wherein the main frame 1 serves as the basic support structure of the entire device, providing an installation platform for other components. H-beams possess excellent mechanical properties, and their unique shape allows them to maintain good stability under pressure and weight. The H-beams are welded together to form the main frame 1, ensuring the frame's robustness and integrity. Adjustable support feet are provided at the bottom because the flatness of different test sites may vary. By adjusting the height of the support feet, the main frame 1 can be kept level, preventing uneven stress on the test valve due to device tilt, which could affect the accuracy of the test results. This also enhances the stability of the device under different ground conditions.

[0029] The blind flange support 2 is fixedly installed at the bottom of the main frame 1, playing a crucial role in supporting the lower blind flange 3. The blind flange support 2 is firmly fixed to the main frame 1 by welding or bolting, forming a stable integral structure with the main frame 1. This ensures stable support for the lower blind flange 3, preventing displacement or shaking during the test and guaranteeing the reliability of the test process.

[0030] The lower blind flange 3 is installed on the upper part of the blind flange support 2 and is in direct contact with the test valve. A through fluid channel 11 is located in the center of the lower blind flange 3, which is the passage for the test medium to enter the test valve. During the test, the pressure pump pressurizes the test medium and delivers it through the pressure pipeline 12 to the fluid channel 11 of the lower blind flange 3, which then enters the test valve, subjecting the valve to pressure and achieving pressure testing. The flange contact surface of the lower blind flange 3 has a sealing groove designed for installing sealing material. When the sealing material is embedded in the sealing groove, it is compressed when the upper and lower blind flanges 3 clamp the test valve, thus tightly fitting against the flange surface of the test valve, filling the tiny gaps between the flange surfaces, and effectively preventing leakage of the test medium.

[0031] The upper blind flange 5 is connected to a hydraulic rod 6 at its top, which passes through the main frame 1. The upper blind flange 5, in conjunction with the lower blind flange 3, clamps the test valve. Its flange contact surface also has a sealing groove with embedded sealing material, working together with the lower blind flange 3 to ensure the sealing of the test valve. The upper blind flange 5 moves vertically under the drive of the hydraulic system 7. When the hydraulic piston in the hydraulic system 7 moves, because the hydraulic piston is fixedly connected to the hydraulic rod 6, the thrust of the hydraulic piston is transmitted to the hydraulic rod 6, causing the hydraulic rod 6 to rise or fall, thereby driving the upper blind flange 5 to move. This achieves precise control of the position of the upper blind flange 5 to meet the clamping force requirements of different pressure level tests.

[0032] The hydraulic system 7 includes a hydraulic cylinder and a hydraulic piston. The hydraulic piston and hydraulic rod 6 are fixedly connected. The hydraulic piston drives the hydraulic rod 6 to move the upper blind plate 5 vertically. Its working principle is based on the pressure transmission of hydraulic oil. When the hydraulic system 7 is started, the hydraulic pump pressurizes the hydraulic oil and delivers it to the hydraulic cylinder. The pressure of the hydraulic oil acts on the hydraulic piston, pushing it to move. Since the hydraulic piston is fixedly connected to the hydraulic rod 6, the linear motion of the hydraulic piston is converted into the linear motion of the hydraulic rod 6, thereby driving the upper blind plate 5 to move up and down, realizing the clamping and releasing operation of the test valve. Furthermore, the movement speed and clamping force of the upper blind plate 5 can be precisely controlled by controlling the flow rate and pressure of the hydraulic oil.

[0033] In this embodiment, an experimental instrument 8 is connected in series with the pressure-pressurizing pipeline 12. The pressure gauge works based on the characteristic of an elastic element undergoing elastic deformation under pressure. When the test medium enters the pressure gauge through the pressure-pressurizing pipeline 12, the pressure acts on the elastic element (such as a Bourdon tube) inside the gauge, causing it to deform. This deformation is converted into pointer rotation via a mechanical transmission mechanism (such as a connecting rod or gear), and the pointer indicates the corresponding pressure value on the dial. By reading the pressure gauge readings, the operator can monitor the pressure of the test medium in real time during the pressurization process, allowing them to control the pressure pump according to the test requirements, ensuring the test proceeds at the predetermined pressure and guaranteeing the safety and accuracy of the test.

[0034] The pressure relief valve 9 is installed on the pressure-pressurizing pipeline 12 between the experimental instrument 8 and the pressure-pressurizing pump. The working principle of the pressure relief valve 9 is based on pressure control. When the pressure in the pressure-pressurizing pipeline 12 exceeds the set opening pressure of the pressure relief valve 9, the valve core inside the valve 9 will be pushed open under pressure, allowing the pressure-pressurizing pipeline 12 to communicate with the outside, and the high-pressure medium to be quickly discharged, thereby reducing the pressure in the pipeline. After the test is completed, the pressure in the pipeline needs to be released for subsequent operations; at this time, the pressure relief valve 9 can be opened. During the test, if an abnormal situation occurs causing a rapid increase in pressure, the pressure relief valve 9 will automatically open to prevent damage to the device and test valves due to excessive pressure, ensuring the safety of the test personnel and the normal operation of the equipment.

[0035] Both the lower blind flange 3 and the upper blind flange 5 have sealing grooves on their flange contact surfaces, into which sealing material is embedded. A test valve is positioned between the lower blind flange 3 and the upper blind flange 5. The sealing grooves are designed to better fix the sealing material, ensuring tight contact between it and the flange face of the test valve. The shape and size of the sealing grooves match the sealing material. When the sealing material is embedded in the sealing grooves, it undergoes elastic deformation under pressure when the upper and lower blind flanges 3 clamp the test valve, filling the tiny gaps between the flange faces and forming an effective sealing barrier. This prevents leakage of the test medium, ensures the sealing performance during the test, and guarantees the reliability of the test results.

[0036] In one possible embodiment, the lower blind plate 3 has a through fluid channel 11 at its center, and the test valve is connected to the test instrument 8, the pressure relief valve 9 and the pressure pump in sequence through the fluid channel 11 and the pressure-pressurizing pipeline 12.

[0037] Specifically, after the pressure pump pressurizes the test medium, the test medium flows into the fluid channel 11 of the lower blind plate 3 through the pressure pump line 12, and then enters the test valve, subjecting the test valve to pressure. During this process, the pressure of the test medium is transmitted to the experimental instrument 8 through the pressure pump line 12 for real-time pressure monitoring. If the pressure is too high, it can be relieved through the pressure relief valve 9. The entire connection method ensures that the test medium can flow orderly in the system, realizing the pressure test of the test valve.

[0038] In one possible embodiment, the sealing material is fluororubber or a spiral wound gasket. Fluororubber possesses excellent high-temperature resistance, oil resistance, and chemical corrosion resistance. Its sealing principle is based on the fact that the fluorine atoms in the fluororubber molecular structure give it high chemical stability and low surface energy. Under compression, it can tightly conform to the flange face of the test valve, filling minute gaps and effectively preventing leakage of the test medium. A spiral wound gasket is composed of alternating metal strips and non-metallic filler materials. The metal strips provide strength and pressure resistance, while the non-metallic filler materials provide sealing performance. Under pressure, the metal portion of the spiral wound gasket can withstand greater pressure, while the non-metallic portion undergoes elastic deformation, filling the gap between the flange faces, thereby achieving a reliable seal.

[0039] In one possible embodiment, the pressure testing line 12 is further provided with a pressure testing port 10. The pressure testing port 10 is the interface connecting the pressure testing pump and the pressure testing line 12. The size and connection method of the pressure testing port 10 are matched with the pressure testing pump. The pressure testing pump and the pressure testing line 12 are connected through a specific connection method (such as threaded connection or flange connection), and sealing material is used to enhance the sealing effect. The pressure testing pump injects the test medium into the pressure testing line 12 through the pressure testing port 10, ensuring that the test medium can smoothly enter the system for pressure testing. If the connection is not tight, it will lead to leakage of the test medium, affecting the normal conduct of the test.

[0040] In one possible embodiment, the experimental instrument 8 is a pressure gauge. The pressure gauge can visually display the pressure value of the test medium, providing operators with real-time pressure data. During the test, operators can adjust the operating status of the pressure pump in a timely manner based on the pressure gauge reading to ensure the test pressure meets the requirements. For example, when the pressure approaches the upper limit set for the test, the output pressure of the pressure pump can be appropriately reduced to avoid damage to the test valves and devices due to excessive pressure; when the pressure is too low, the output pressure of the pressure pump can be increased to ensure the test proceeds according to the predetermined pressure program, guaranteeing the accuracy of the test results.

[0041] In one possible embodiment, both the lower blind flange 3 and the upper blind flange 5 are made of stainless steel, and their surfaces are chrome-plated. Stainless steel has good corrosion resistance, resisting the erosion of the test medium and extending the service life of the blind flange. Chrome plating further improves the surface hardness and corrosion resistance of the blind flange, while making the surface smoother, reducing friction with the flange face of the test valve, facilitating better adhesion of the sealing material, and improving the sealing effect.

[0042] In one possible embodiment, the main frame 1 is welded from H-beams, and the bottom of the main frame 1 is equipped with adjustable support feet. The main frame 1, welded from H-beams, has high strength and stability, and can withstand various forces during the test. The adjustable support feet at the bottom can be height-adjusted according to the actual conditions of the test site. By rotating the support feet, the height of the support feet can be changed, keeping the main frame 1 in a horizontal position. This not only avoids uneven force on the test valve caused by device tilting, which would affect the test results, but also enhances the stability of the device under different ground conditions, ensuring the reliability of the test process.

[0043] In one possible embodiment, a guide mechanism is provided between the hydraulic rod 6 and the main frame 1. The guide mechanism includes a linear bearing and a guide sleeve. The linear bearing and the guide sleeve work together to ensure the straightness and stability of the hydraulic rod 6 during movement. The rolling elements of the linear bearing roll between the inner and outer rings, which effectively reduces the frictional resistance between the hydraulic rod 6 and the guide sleeve, making the movement of the hydraulic rod 6 smoother. The guide sleeve restricts the direction of movement of the hydraulic rod 6, ensuring that the hydraulic rod 6 can only move in a straight line in the vertical direction. In this way, when the hydraulic system 7 drives the hydraulic rod 6 to move the upper blind plate 5, it can ensure that the upper blind plate 5 accurately presses the test valve, avoiding skewing, thereby ensuring the sealing effect of the test valve and ensuring the accuracy of the test results.

[0044] The workflow of this utility model is as follows:

[0045] First, device preparation: Place the main frame 1 on a flat surface and adjust its level using the adjustable support feet to ensure stability. Check that all component connections are secure, such as the connections between the blind flange support 2 and the main frame 1, and between the upper and lower blind flanges 3 and the hydraulic rods 6. Check that the pressure testing pipeline 12, experimental instruments 8, and pressure relief valve 9 are functioning properly, ensuring there are no leaks or damage. Add an appropriate amount of clean hydraulic oil to the hydraulic system 7 to ensure normal system operation.

[0046] Second, valve installation: Start the hydraulic system 7. The hydraulic pump injects hydraulic oil into the hydraulic cylinder, pushing the hydraulic piston and causing the hydraulic rod 6 to rise, raising the upper blind flange 5. Place the valve to be tested on the lower blind flange 3, ensuring that the valve center is aligned with the center of the fluid passage 11 of the lower blind flange 3 to facilitate the smooth entry of the test medium. Start the hydraulic system 7 again, allowing the upper blind flange 5 to slowly descend until it contacts the valve's upper flange. Continuously apply pressure using the hydraulic system 7 to tightly clamp the valve between the upper and lower blind flanges 3. Under pressure, the sealing material fills the flange gap to prevent leakage.

[0047] Third, pressure test: Connect the pressure pump to the pressure port 10, start the pressure pump, and pressurize the test medium (such as water). Inject the medium into the valve through the pressure pipeline 12 and the fluid channel 11 of the lower blind plate 3. As the medium is injected, the pressure inside the valve gradually increases, simulating the actual working pressure environment. During the test, the valve can withstand different pressure values ​​by adjusting the flow rate and pressure of the pressure pump, thus comprehensively testing the valve performance.

[0048] Fourth, data monitoring: The experimental instrument 8 monitors the pressure within the pressurization pipeline 12 in real time, converting the pressure signal into pointer rotation or digital display, allowing operators to intuitively obtain pressure data. Closely observe changes in the pressure gauge readings. If abnormal pressure fluctuations occur or exceed the set range, promptly investigate for malfunctions in the pressurization pump, pipelines, valves, etc., to ensure the safety and accuracy of the test. Simultaneously, check for leaks in all parts of the valves. If leaks are found, record the location and extent of the leak to determine if the valve's sealing performance meets the standards.

[0049] Fifth, pressure relief: After the test, first shut down the pressure pump and stop injecting media into the valve. Slowly open the pressure relief valve 9 to discharge the high-pressure media in the pressure pipeline 12 and the valve, reducing the pressure. Note that the pressure relief rate should not be too fast to prevent sudden pressure changes from damaging equipment or causing danger. Once the pressure has dropped to a safe range, close the pressure relief valve 9.

[0050] Sixth, valve disassembly: Restart the hydraulic system 7 to raise the upper blind flange 5, releasing the clamping force on the valve. Carefully remove the tested valve, and clean the valve, upper and lower blind flanges 3, and residual media and impurities in the sealing groove to prepare for the next test.

[0051] Although the present invention has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A pipe valve pressure testing apparatus, characterized by, include: Main framework (1); Blind plate support (2), the blind plate support (2) is fixedly installed at the bottom of the main frame (1); The lower blind plate (3) is installed on the upper part of the blind plate support (2); Upper blind plate (5), the top of which is connected to a hydraulic rod (6), which passes through the main frame (1); The hydraulic system (7) includes a hydraulic cylinder and a hydraulic piston. The hydraulic piston and the hydraulic rod (6) are fixedly connected. The hydraulic piston is used to drive the hydraulic rod (6) to move the upper blind plate (5) in the vertical direction. The experimental instrument (8) is connected in series with the pressure testing pipeline (12); A pressure relief valve (9) is installed on the pressure pipeline (12) between the experimental instrument (8) and the pressure pump; The flange contact surfaces of the lower blind plate (3) and the upper blind plate (5) are provided with sealing grooves, and sealing material is embedded in the sealing grooves; a test valve (4) is arranged between the lower blind plate (3) and the upper blind plate (5).

2. The pipe valve pressure testing apparatus of claim 1, wherein, The lower blind plate (3) has a through fluid channel (11) in the center. The test valve (4) is connected to the test instrument (8), the pressure relief valve (9) and the pressure pump in sequence through the fluid channel (11) and the pressure-pressurizing pipeline (12).

3. The pipe valve pressure testing apparatus of claim 2, wherein, The sealing material is fluororubber or metal spiral wound gasket.

4. The pipe valve pressure testing apparatus of claim 1, wherein, The pressure testing pipeline (12) is also provided with a pressure testing port (10).

5. The pipe valve pressure testing apparatus of claim 1, wherein, The experimental instrument (8) is a pressure gauge.

6. The pipe valve pressure testing apparatus of claim 1, wherein, Both the lower blind plate (3) and the upper blind plate (5) are made of stainless steel, and the surfaces of the lower blind plate (3) and the upper blind plate (5) are chrome-plated.

7. The pipe valve pressure testing apparatus of claim 1, wherein, The main frame (1) is welded from H-beams, and the bottom of the main frame (1) is provided with adjustable support feet.

8. The pipe valve pressure testing apparatus of claim 1, wherein, A guide mechanism is provided between the hydraulic rod (6) and the main frame (1), and the guide mechanism includes a linear bearing and a guide sleeve.

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