Test device for measuring leakage rate of valve sealing surface

Abstract

The utility model belongs to valve maintenance technical field, more specifically, it is related to a kind of test device of measuring valve sealing surface leakage rate, it includes test assembly, water tank, pressurizing pump, flow regulating meter and leakage measuring device: test assembly includes valve seat and end cap, and installation space is between valve seat and end cap, valve seat has the valve seat sealing surface being set towards installation space, installation space is used to install for the valve clack to be detected, valve seat sealing surface is used to be consistent with the sealing surface of the valve clack to be detected, valve seat is connected with end cap and is used to compress the valve clack being placed in installation space, water tank is connected the valve port of valve seat by connecting pipe, pressurizing pump and flow regulating meter are located on connecting pipe, and leakage measuring device is used to collect and measure the fluid leaking from installation space.The device can simulate the state of valve under different working conditions, realize the detection of the sealing effect of the sealing surface of valve, and provide reliable data for the quality evaluation of valve sealing performance.

Description

Technical Field

[0001] This application belongs to the field of valve maintenance technology, and more specifically, it relates to a test device for measuring the leakage rate of valve sealing surfaces. Background Technology

[0002] Valves used in critical industrial facilities such as nuclear power plants typically employ cobalt-based hard alloy weld overlays for their sealing surfaces. After repeated maintenance, the weld overlay can thin and crack, leading to leaks.

[0003] The existing technology lacks a test device specifically for measuring the leakage rate of valve sealing surface cracks, making it difficult to accurately assess the sealing performance of valves with crack defects. Therefore, there is an urgent need for a device that can effectively detect the sealing performance of valve sealing surfaces. Utility Model Content

[0004] The purpose of this application is to provide a test device for measuring the leakage rate of a valve sealing surface, so as to detect the sealing performance of the valve sealing surface.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0006] A test apparatus for measuring the leakage rate of a valve sealing surface is provided, comprising:

[0007] The test assembly includes a valve seat and an end cap, with an installation space between the valve seat and the end cap. The valve seat has a valve seat sealing surface facing the installation space. The installation space is used for mounting the valve disc to be tested. The valve seat sealing surface is used to fit with the sealing surface of the valve disc to be tested. The valve seat is connected to the end cap and is used to press the valve disc placed in the installation space.

[0008] A water tank is used to store test water. The water tank has a first outlet, which is connected to the inlet of the valve seat through a connecting pipe.

[0009] A booster pump, installed on the connecting pipe, is used to provide the water pressure required for the test;

[0010] A flow regulator, mounted on the connecting pipe and positioned between the booster pump and the valve seat, is used to regulate the flow rate of fluid entering the valve seat; and

[0011] Leakage metering device;

[0012] The valve seat and the end cover are provided with at least one of the drainage holes that communicate with the installation space. The leakage metering device is connected to the drainage hole and is used to collect and measure the fluid leaking from the installation space.

[0013] In some embodiments, the end cap has a groove on the side facing the mounting space for the valve disc adapter to be tested to snap into place.

[0014] In some embodiments, the valve seat sealing surface has several valve seat cracks, and the formation cause of the valve seat cracks is similar to that of the cracks on the sealing surface of the valve disc to be tested.

[0015] In some embodiments, the test assembly further includes a plurality of simulated valve discs having simulated sealing surfaces. The simulated valve discs are detachably mounted into the installation space and the valve seat sealing surface is in contact with the simulated sealing surface. The simulated sealing surface has a plurality of simulated cracks, which are similar to the cracks on the sealing surface of the valve disc to be tested. The simulated cracks on the simulated sealing surfaces of each simulated valve disc are different.

[0016] In some embodiments, the test assembly further includes a pressure control console for applying pressure to the valve seat and end cap to adjust the pressure exerted by the valve seat and end cap on the mounting space.

[0017] In some embodiments, the test apparatus for measuring the leakage rate of the valve sealing surface further includes a heater and a thermometer mounted on the connecting pipe. The heater is located between the pressure pump and the flow meter to heat the fluid in the connecting pipe, and the thermometer is located between the flow meter and the valve seat to detect the temperature of the fluid flowing into the valve seat.

[0018] In some embodiments, the leakage metering device includes a drain pipe and a condenser, the drain pipe being connected to a drain hole, and the condenser being installed in the drain pipe and used to cool the fluid flowing into the drain pipe.

[0019] In some embodiments, the leakage metering device further includes a memory and a weighing device, the memory being connected to a drain hole via a drain tube to collect fluid leaking from the installation space, and the weighing device being used to weigh the memory.

[0020] In some embodiments, the test apparatus for measuring the leakage rate of valve sealing surfaces further includes an accumulator installed between the pressurizing pump and the heater, and used to absorb excess pressure of the fluid flowing out of the pressurizing pump.

[0021] In some embodiments, the water tank further has a second outlet, which is connected to a connecting pipe via a bypass pipe at a position between the accumulator and the heater. The bypass pipe is provided with a first valve, and the connecting pipe is provided with a second valve at a position between the first outlet and the bypass pipe.

[0022] The beneficial effects of the test device for measuring the leakage rate of valve sealing surfaces provided in this application are as follows: The test device for measuring the leakage rate of valve sealing surfaces provided in this application can perform leakage tests on the valve disc in the valve. After the valve disc is removed from the valve and installed in the installation space, the water pressure is adjusted by a pressurizing pump and the flow rate is controlled by a flow regulator. This can simulate the state of the valve under different working conditions and make the test results close to the actual use conditions, so as to realize the detection of the sealing effect of the valve sealing surface and provide reliable data for the quality evaluation of valve sealing performance. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A schematic diagram of the structure of a test apparatus for measuring the leakage rate of a valve sealing surface provided in an embodiment of this application;

[0025] Figure 2 A schematic diagram of the structure of a test apparatus for measuring the leakage rate of a valve sealing surface, provided in another embodiment of this application;

[0026] Figure 3 A cross-sectional view of the test component (without valve disc installed) of the test apparatus for measuring the leakage rate of valve sealing surface provided in the embodiments of this application;

[0027] Figure 4 A cross-sectional view of the test assembly (with the valve disc to be tested installed) of the test apparatus for measuring the leakage rate of a valve sealing surface provided in the embodiments of this application;

[0028] Figure 5 A cross-sectional view of the test component (with a simulated valve disc installed) of the test apparatus for measuring the leakage rate of a valve sealing surface provided in the embodiments of this application.

[0029] The following are the labeling elements in the figure:

[0030] 10. Test assembly; 11. Valve seat; 111. Valve seat sealing surface; 112. Valve port; 12. End cap; 121. Groove; 122. Drain hole; 13. Installation space; 20. Valve disc; 201. Valve disc sealing surface; 21. Simulated valve disc; 211. Simulated sealing surface; 30. Water tank; 31. First outlet; 32. Second outlet; 33. Connecting pipe; 34. Bypass pipe; 35. First valve; 36. Second valve; 40. Booster pump; 50. Flow regulator; 60. Leakage metering device; 61. Drain pipe; 62. Condenser; 63. Memory; 64. Weighing device; 70. Heater; 80. Thermometer; 90. Accumulator. Detailed Implementation

[0031] To make the technical problem to be solved, the technical solution and the beneficial effects of this application clearer, the following is in conjunction with the appendix. Figures 1 to 5 The present application will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

[0032] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0033] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, "multiple sets" means two or more sets, "multiple pieces" means two or more pieces, and "several" means one or more, unless otherwise explicitly specified.

[0035] Important valves in nuclear power plants use cobalt-based hard alloy weld overlay sealing surfaces. Specifically, this refers to the process of welding cobalt-based hard alloy material onto the surface of the valve's sealing parts to improve the performance of the sealing surface. This gives the sealing surface excellent wear resistance, corrosion resistance, and high temperature resistance, thereby enhancing the valve sealing surface's ability to withstand the erosion of high-temperature and high-pressure fluids.

[0036] The sealing parts of a valve mainly include the sealing part between the valve seat and the valve core. The seal between the valve seat and the valve core is the most important sealing part of the valve. The valve seat is fixed on the valve body, and the valve core is driven by components such as the valve stem and cooperates with the valve seat. When the valve is closed, the surfaces of the valve core and the valve seat that face each other are pressed together to form a seal, preventing the medium from passing through.

[0037] The sealing surfaces of valves are overlaid with cobalt-based hard alloys. Cobalt-based hard alloys have high hardness, especially at high temperatures, which allows the valve sealing surfaces to resist the erosion and wear of the medium during long-term use, and are less prone to scratches, pits, and other damage, thus helping to improve sealing performance. Cobalt-based hard alloys also have good wear resistance, able to withstand the friction between the sealing surfaces during frequent opening and closing of the valve, as well as the grinding of solid particles and other impurities in the medium, extending the service life of the valve. Cobalt-based hard alloys have excellent resistance to many corrosive media, such as acids, alkalis, and salts, preventing corrosion damage to the sealing surfaces and ensuring normal operation in harsh working environments. Furthermore, cobalt-based hard alloys maintain stable performance at high temperatures, and are not prone to deformation or softening, making them particularly suitable for valves in high-temperature conditions, such as high-temperature steam pipeline valves in power plants.

[0038] However, in actual use, after repeated grinding and repair, the weld overlay on the valve sealing surface will continue to thin, and defects such as cracks may also appear, causing leakage at the valve sealing surface, reducing the thermal efficiency of the unit system. In severe cases, the weld overlay on the sealing surface may even break off, leading to valve seal failure. The broken part may fall off and become foreign matter in the system, causing serious damage to important equipment such as pumps using the valve, affecting the safe and reliable operation of the unit. Therefore, there is an urgent need for a device that can effectively test the sealing performance of valve sealing surfaces.

[0039] Based on this, this application provides a test device for measuring the leakage rate of valve sealing surfaces to solve the above problems.

[0040] Please refer to the following: Figures 1 to 5 The test apparatus for measuring the leakage rate of valve sealing surfaces provided in this application embodiment is applicable, but not limited to, for testing the sealing performance of the sealing surface between the valve seat 11 and the valve core of a valve.

[0041] like Figures 1 to 4As shown, the test apparatus for measuring the leakage rate of valve sealing surfaces in this embodiment includes a test assembly 10, a water tank 30, a pressurizing pump 40, a flow regulator 50, and a leakage metering device 60. The test assembly 10 includes a valve seat 11 and an end cap 12, with an installation space 13 between the valve seat 11 and the end cap 12. The valve seat 11 has a valve seat sealing surface 111 facing the installation space 13. The installation space 13 is used for mounting the valve disc 20 to be tested. The valve seat sealing surface 111 is used to fit against the valve disc sealing surface 201 of the valve disc 20 to be tested. The valve seat 11 is connected to the end cap 12 and is used to press the valve disc 20 placed in the installation space 13. 0; Water tank 30 is used to store test water. Water tank 30 has a first outlet 31, which is connected to the inlet of valve seat 11 through connecting pipe 33; Pressure pump 40 is installed on connecting pipe 33 and is used to provide the water pressure required for testing; Flow regulator 50 is installed on connecting pipe 33 and is located between pressure pump and valve seat 11 to regulate the flow rate of fluid entering valve seat 11; wherein, at least one of valve seat 11 and end cover 12 is also provided with a drain hole 122 communicating with installation space 13, and leakage metering device 60 is connected to drain hole 122 and is used to collect and measure fluid leaking from installation space 13.

[0042] In this embodiment, the test apparatus for measuring the leakage rate of a valve sealing surface includes a test component 10. The test component 10 includes a valve seat 11 and an end cap 12. An installation space 13 is provided between the valve seat 11 and the end cap 12 for mounting the valve disc 20 to be tested. Exemplarily, the valve seat 11 and the end cap 12 are detachably connected. When they are separated, the valve disc 20 to be tested can be installed into the installation space 13. When they are connected and fixed, the valve seat 11 and the end cap 12 cooperate to press the valve disc 20 placed in the installation space 13. Alternatively, the valve seat 11 and the end cap 12 are movably connected. When they are in one connection state, the valve disc 20 can be installed into the installation space 13. When they are in another connection state, the valve seat 11 and the end cap 12 cooperate to press the valve disc 20 placed in the installation space 13.

[0043] Valve seat 11 has a valve seat sealing surface 111 facing the mounting space 13, such as Figure 4 As shown, during testing, the valve seat sealing surface 111 will fit together with the valve disc sealing surface 201 of the valve disc 20 to be tested, forming a sealing structure to simulate the sealing state of the valve during actual operation. After the valve seat 11 is connected to the end cover 12, it can press the valve disc 20 placed in the installation space 13 to ensure the stability of the valve disc 20 during the test, and ensure the reliable fit between the valve seat sealing surface 111 and the valve disc sealing surface 201 of the valve disc 20 to be tested, reducing the risk of the valve disc 20 loosening and affecting the accuracy of the test results. The area of ​​the valve seat sealing surface 111 is larger than the area of ​​the valve disc sealing surface 201 of the valve disc 20 to be tested, so that the valve disc sealing surface 201 can be fully fitted to the valve seat sealing surface 111.

[0044] The test apparatus for measuring the leakage rate of valve sealing surfaces also includes a water tank 30, a booster pump 40, and a flow regulator 50. The water tank 30 stores test water and has a first outlet 31, which is connected to the inlet of the valve seat 11 via a connecting pipe 33. This allows water from the water tank 30 to flow out of the first outlet 31 and into the valve seat 11 through the connecting pipe 33, providing the necessary fluid medium for the test. The booster pump 40 is installed on the connecting pipe 33 to provide the required water pressure for the test. By adjusting the booster pump 40, the sealing conditions between the valve disc sealing surface 201 and the valve seat sealing surface 111 of the valve seat 11 under different operating pressures can be simulated, thus allowing for more accurate measurement of the leakage rate. The flow regulator 50 is also installed on the connecting pipe 33 and located between the booster pump 40 and the valve seat 11. It regulates the flow rate of the fluid entering the valve seat 11, ensuring the test can be conducted under appropriate flow conditions and guaranteeing the reliability and accuracy of the test results.

[0045] The test apparatus for measuring the leakage rate of a valve sealing surface also includes a leakage metering device 60. At least one of the valve seat 11 and the end cap 12 is provided with a drainage hole 122 communicating with the installation space 13. The leakage metering device 60 is connected to the drainage hole 122. When leakage occurs between the valve disc sealing surface 201 and the valve seat sealing surface 111 of the valve disc 20 to be tested, the leaked fluid can flow into the leakage metering device 60 through the drainage hole 122. The leakage metering device 60 can collect and measure this leaked fluid, thereby determining the leakage rate of the valve sealing surface. Exemplarily, the leakage metering device 60 can be a device with collection and weighing functions or a device with collection and volume measurement functions, etc.

[0046] Understandably, in this embodiment of the application, when the valve disc 20 is not installed in the installation space 13, such as Figure 3 As shown, the inlet of valve seat 11 is connected to the installation space 13, allowing test water to flow into the installation space 13. When valve disc 20 is installed into the installation space 13, as... Figure 4 As shown, when the valve disc sealing surface 201 is in contact with the valve seat sealing surface 111 of the valve seat 11, the installation space 13 is sealed. Water flowing in from the valve port 112 cannot flow directly out of the installation space 13. Water can only flow out through the leak location when there is a leak between the valve disc sealing surface 201 and the valve seat sealing surface 111. The valve seat 11 and / or the end cap 12 are also provided with a drainage hole 122 communicating with the installation space 13. In this way, water leaking from between the valve disc sealing surface 201 and the valve seat sealing surface 111 can flow out through the drainage hole 122 and enter the leakage metering device 60.

[0047] It should be noted that the valve seat 11 can be a valve seat with specifications similar to the valve seat 11 of the valve to be tested. The structure and sealing performance of its valve seat sealing surface 111 can simulate the valve seat of the valve to be tested. For example, the valve seat sealing surface 111 can obtain sealing characteristics similar to the sealing surface of the valve seat of the valve to be tested through similar fluid impact, foreign object friction, high temperature and high pressure impact, etc. The valve disc 20 can be removed from the valve seat to be tested and directly installed in the installation space 13 for testing.

[0048] The test apparatus for measuring the leakage rate of valve sealing surfaces according to this application embodiment includes a test assembly 10, a water tank 30, a pressure pump 40, a flow regulator 50, and a leakage metering device 60. The test assembly 10 includes a valve seat 11 and an end cap 12 detachably connected to the valve seat 11. An installation space 13 is formed between the valve seat 11 and the end cap 12. The valve seat 11 has a valve seat sealing surface 111 facing the installation space 13. The installation space 13 is used to install the valve disc 20 to be tested. The valve seat sealing surface 111 is used to fit against the valve disc sealing surface 201 of the valve disc 20 to be tested. After the valve seat 11 is connected to the end cap 12, it can press the valve disc 20 placed in the installation space 13 to ensure that the valve disc 20 is stable in position and the sealing surface is tightly fitted during the test. The water tank 30 stores test water and outputs it to the valve seat 11 through the connecting pipe 33, providing a stable water source for testing. At the same time, a booster pump 40 and a flow regulator 50 are also installed on the connecting pipe 33. The booster pump 40 is used to provide the water pressure required for testing, simulating the pressure environment that the valve is subjected to in actual operation. The flow regulator 50 is located between the booster pump 40 and the valve seat 11 and can adjust the flow rate of the fluid entering the valve seat 11 to meet the requirements of different test conditions. At least one of the valve seat 11 and the end cover 12 is provided with a drainage hole 122 that communicates with the installation space 13. The leakage metering device 60 is connected to the drainage hole 122 and is used to collect and measure the fluid leaking from the installation space 13, thereby calculating the leakage rate of the valve sealing surface.

[0049] Thus, the test device for measuring the leakage rate of valve sealing surface in this embodiment of the application can perform leakage tests on the valve disc 20 in the valve. After the valve disc 20 is removed from the valve, it is installed in the installation space 13. Then, the water pressure is adjusted by the pressure pump 40 and the flow rate is controlled by the flow regulator 50. This can simulate the state of the valve under different working conditions and make the test results close to the actual use situation. This enables the detection of the sealing effect of the valve sealing surface and provides reliable data for the quality evaluation of valve sealing performance.

[0050] In some embodiments, such as Figure 3 and Figure 4 As shown, the end cap 12 has a groove 121 on the side facing the mounting space 13. The groove 121 is used for the valve disc 20 to be tested to be fitted and snapped in place.

[0051] Thus, a groove 121 is provided on the side of the end cap 12 facing the installation space 13. When the valve disc 20 is installed, the valve disc 20 can be inserted into the groove 121. The groove 121 provides a relatively fixed position for the valve disc 20. When the valve disc 20 is inserted into the groove 121, the position of the valve disc 20 in the installation space 13 can be accurately determined, ensuring that the valve disc 20 is in the correct installation state during the test, reducing the risk of displacement or shaking, thereby improving the accuracy and reliability of the test results.

[0052] In some embodiments, the valve seat sealing surface 111 has a number of valve seat cracks, and the valve seat cracks are formed for a similar reason as the cracks in the valve disc sealing surface 201 of the valve disc 20 to be tested.

[0053] In this embodiment, the valve seat sealing surface 111 on the valve seat 11, which is used to fit against the sealing surface of the valve disc 20 to be tested, has a valve seat crack. This crack and the crack on the valve disc sealing surface 201 of the valve disc 20 to be tested are formed for similar reasons. That is, by simulating the formation conditions of the crack on the valve disc sealing surface 201 of the valve disc 20 to be tested, cracks with the same shape and size are formed on the valve seat sealing surface 111 of the valve seat 11. Since the valve seat crack and the crack on the valve disc sealing surface 201 of the valve disc 20 to be tested are formed for similar reasons, they may exhibit similar leakage characteristics under the same test conditions. This helps to more accurately evaluate and analyze the leakage situation when cracks appear on the valve sealing surface in actual use, and provides a basis for improving the valve sealing performance.

[0054] In some embodiments, such as Figure 5 As shown, the test assembly 10 also includes multiple simulated valve discs 21. Each simulated valve disc 21 has a simulated sealing surface 211. The simulated valve disc 21 can be detachably installed into the installation space 13, and the valve seat sealing surface 111 is in contact with the simulated sealing surface 211. The simulated sealing surface 211 has several simulated cracks, which are similar to the cracks on the valve disc sealing surface 201 of the valve disc 20 to be tested. The simulated cracks on the simulated sealing surface 211 of each simulated valve disc 21 are different.

[0055] In this embodiment, in addition to the valve seat 11 and end cap 12, the test assembly 10 also includes several simulated valve discs 21, which are specially designed to assist in testing. Each simulated valve disc 21 has a simulated sealing surface 211 that can fit against the valve seat sealing surface 111 of the valve seat 11, just as the valve disc sealing surface 201 of the valve disc 20 to be tested fits against the valve seat sealing surface 111, to form a sealing structure for relevant testing. Several simulated cracks are provided on the simulated sealing surface 211. These simulated cracks are similar to the cracks on the valve disc sealing surface 201 of the valve disc 20 to be tested. "Similar" means that the shape, size, distribution, and cause of formation of the cracks are the same or substantially the same. The simulated valve disc 21 can be detachably installed into the installation space 13. In this way, different simulated valve discs 21 can be replaced according to different test requirements. For example, simulated valve discs 21 with different types and degrees of cracks can be replaced, or the simulated valve disc 21 can be removed when it is not needed to restore the test state of the ordinary valve disc 20 to be tested, which increases the flexibility and versatility of the test assembly 10.

[0056] In this way, by setting up multiple simulated valve discs 21 and setting different simulated cracks on the simulated sealing surfaces 211 of different simulated valve discs 21, that is, each simulated valve disc 21 has a simulated sealing surface 211, and the simulated cracks on the simulated sealing surfaces 211 of these simulated valve discs 21 are all different, thus enabling a more comprehensive simulation of the crack condition of the valve disc sealing surface 201 of the valve disc 20 under different conditions. Thus, by setting up multiple simulated valve discs 21 with different simulated cracks, various possible crack morphologies, sizes, distributions, and other characteristics can be covered, allowing for a more extensive study of the impact of different cracks on the leakage rate of the valve sealing surface during the testing process. This provides richer and more comprehensive data references for accurately evaluating and improving valve sealing performance, making the test results more universal and reliable.

[0057] For example, the simulated sealing surface 211 of the simulated valve disc 21 can be a sealing surface made of cobalt-based hard alloy overlay welding.

[0058] In some embodiments, the test assembly 10 further includes a pressure control console (not shown) for applying pressure to the valve seat 11 and end cap 12 to adjust the pressure exerted by the valve seat 11 and end cap 12 on the mounting space 13.

[0059] In this embodiment, the pressure control console can apply pressure to the valve seat 11 and the end cap 12, thereby adjusting the pressure exerted by the valve seat 11 and the end cap 12 on the installation space 13. This allows the sealing surface (simulated sealing surface) of the valve disc 20 (the valve disc to be tested or the simulated valve disc) installed in the installation space 13 to maintain a certain pressure and reliably fit with the valve seat sealing surface 111. Furthermore, by adjusting the pressure applied to the valve seat 11 and the end cap 12 by the pressure control console, the pressure conditions borne by the valve under different working conditions can be simulated, thereby studying the sealing performance between the valve disc 20 and the valve seat 11 under different pressure conditions.

[0060] The pressure control console can transmit force to the valve seat 11 and the end cover 12 through some mechanical structure, hydraulic system or other pressure application method.

[0061] In some embodiments, such as Figure 2 As shown, the test apparatus for measuring the leakage rate of the valve sealing surface also includes a heater 70 and a thermometer 80 installed on the connecting pipe 33. The heater 70 is located between the pressurizing pump 40 and the flow meter to heat the fluid in the connecting pipe 33, and the thermometer 80 is located between the flow meter and the valve seat 11 to detect the temperature of the fluid flowing into the valve seat 11.

[0062] The heater 70 is installed on the connecting pipe 33 and located between the pressurizing pump 40 and the flow meter. The heater 70 is used to heat the fluid in the connecting pipe 33. By heating the fluid, the working state of the valve under different temperature environments can be simulated. In actual applications, the valve may face various temperature conditions, which can affect the performance of the valve sealing surface by evaluating the impact of temperature changes, such as causing material expansion or contraction and thus affecting the sealing effect. By controlling and adjusting the temperature of the fluid, the influence of temperature factors on the leakage rate of the valve sealing surface can be studied more comprehensively.

[0063] The thermometer 80 is located between the flow meter and the valve seat 11 to detect the temperature of the fluid flowing into the valve seat 11, thereby accurately detecting the actual temperature value of the fluid entering the valve seat 11. In this way, on the one hand, the thermometer 80 can work with the heater 70 to precisely control and monitor the temperature of the fluid entering the valve seat 11, ensuring that the test is conducted under the set temperature conditions; on the other hand, obtaining accurate temperature data helps to analyze the relationship between temperature and valve sealing surface leakage rate, providing key parameters for studying and evaluating the valve's sealing performance under different temperature conditions.

[0064] In some embodiments, such as Figures 2 to 4 As shown, the leakage metering device 60 includes a drain pipe 61 and a condenser 62. The drain pipe 61 is connected to the drain hole 122, and the condenser 62 is installed in the drain pipe 61 and is used to cool the fluid flowing into the drain pipe 61.

[0065] In this device, the drain pipe 61 of the leakage metering device 60 is connected to the drain hole 122 to guide and collect fluid leaking from parts such as the valve seat 11. A condenser 62 is installed on the drain pipe 61 to cool the fluid flowing into it. Thus, in tests measuring the leakage rate of the valve sealing surface, the leaking fluid may be at a high temperature. Cooling the fluid through the condenser 62 lowers its temperature to a level more suitable for measurement and handling. For example, the cooled fluid may be easier to collect and measure, and it also reduces the risk of damage or performance issues to other components of the collection device caused by the high-temperature fluid, thus improving the accuracy and reliability of the leakage rate measurement.

[0066] In a specific embodiment, the condenser 62 can be a liquid cooling pipe, and the drain pipe 61 is inserted in the liquid cooling pipe. The test fluid in the drain pipe 61 is cooled by the flow of refrigerant in the liquid cooling pipe, thereby achieving condensation.

[0067] In some embodiments, the leakage metering device 60 further includes a memory 63 and a weighing device 64. The memory 63 is connected to the drainage hole 122 via a drainage tube 61 to collect fluid leaking from the installation space 13, and the weighing device 64 is used to weigh the memory 63.

[0068] The memory 63 is connected to the drain hole 122 via the drain pipe 61, and the memory 63 collects fluid leaking from the installation space 13. When the valve sealing surface leaks, the leaking fluid enters the drain pipe 61 through the drain hole 122, and is then guided by the drain pipe 61 to the memory 63 for storage.

[0069] The weighing device 64 is used to weigh the storage container 63. By measuring the weight change of the storage container 63 before and after collecting the leaking fluid, the weight of the collected leaking fluid can be calculated. Since the density of the fluid is known under certain conditions, the volume of the leaking fluid can be further calculated based on the relationship between weight and density, thereby accurately measuring the leakage amount at the valve sealing surface and providing precise data support for evaluating the valve's sealing performance.

[0070] In some embodiments, such as Figure 1 and Figure 2 As shown, the test apparatus for measuring the leakage rate of valve sealing surfaces also includes an accumulator 90, which is installed between the pressure pump 40 and the heater 70 and is used to absorb excess pressure of the fluid flowing out of the pressure pump 40.

[0071] An accumulator 90 is installed between the booster pump 40 and the heater 70. The accumulator 90 absorbs excess pressure from the fluid flowing out of the booster pump 40. The booster pump 40 is installed on the connecting pipe 33 to increase the fluid pressure, simulating the pressure conditions of the valve in actual operation. The pressure output by the booster pump 40 may fluctuate, or in some cases, exceed the pressure required for the test. In this case, the accumulator 90 acts as a "pressure buffer," storing this excess pressure energy, thus stabilizing the fluid pressure within the connecting pipe 33. This ensures that the fluid pressure entering the heater 70 and subsequently flowing through the valve remains within a relatively stable range, reducing the impact of large pressure fluctuations on the test results and improving the accuracy and reliability of valve sealing surface leakage rate measurement.

[0072] In some embodiments, such as Figure 2 As shown, the water tank 30 also has a second outlet 32. The second outlet 32 ​​is connected to the connecting pipe 33 through a bypass pipe 34 at a position between the accumulator 90 and the heater 70. The bypass pipe 34 is provided with a first valve 35, which is used to open or close the bypass pipe 34. The connecting pipe 33 is provided with a second valve 36 at a position between the first outlet 31 and the bypass pipe 34.

[0073] In this embodiment, the water tank 30 has a second outlet 32 ​​in addition to the first outlet 31, which provides another outflow path for the water in the water tank 30. The second outlet 32 ​​is connected to the connecting pipe 33 between the accumulator 90 and the heater 70 through a bypass pipe 34 to form a bypass channel from the water tank 30 to the connecting pipe 33, so that the water in the water tank 30 can directly enter a specific position in the connecting pipe 33 without passing through equipment such as the booster pump 40.

[0074] A first valve 35 is also provided on the bypass pipe 34 to control the opening and closing of the bypass pipe 34. A second valve 36 is provided on the connecting pipe 33 between the first outlet 31 and the bypass pipe 34 to control the opening and closing of the connecting pipe 33. When the first valve 35 is open and the second valve 36 is closed, water in the water tank 30 can flow from the second outlet 32 ​​into the connecting pipe 33 through the bypass pipe 34. This can be used for specific test requirements, such as when a certain amount of water needs to be quickly added to the connecting pipe 33, or when water that has not been pressurized by the pressurization pump 40 and stabilized by the accumulator 90 needs to be directly introduced into the connecting pipe 33 under specific conditions to observe the operation of the test device under different water flow conditions, or when the system is being flushed or debugged. In these cases, the valve can be opened to supply water through the bypass pipe 34. When the first valve 35 is closed and the second valve 36 is open, the bypass pipe 34 is blocked, and the water in the water tank 30 cannot enter the connecting pipe 33 through this path. The water flows out from the first outlet 31 of the water tank 30, passes through the booster pump 40, accumulator 90 and other equipment, and then enters the connecting pipe 33 to carry out the relevant test procedures.

[0075] Thus, by setting up a second outlet 32, a bypass pipe 34, and a first valve 35, a more flexible water flow control method is provided for the test device for measuring the leakage rate of the valve sealing surface, which helps to meet different test conditions and requirements and improve the operability and accuracy of the test.

[0076] The description of the various embodiments above tends to emphasize the differences between the various embodiments. The similarities or similarities between them can be referred to, and for the sake of brevity, they will not be repeated here.

[0077] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A test apparatus for measuring the leakage rate of a valve sealing surface, characterized in that, include: The test assembly includes a valve seat and an end cap, with an installation space between the valve seat and the end cap. The valve seat has a valve seat sealing surface facing the installation space. The installation space is used for mounting a valve disc to be tested. The valve seat sealing surface is used to fit against the sealing surface of the valve disc to be tested. The valve seat is connected to the end cap and is used to press the valve disc placed in the installation space. A water tank for storing test water, the water tank having a first outlet, the first outlet being connected to the inlet of the valve seat via a connecting pipe; A booster pump, installed on the connecting pipe, is used to provide the water pressure required for the test; A flow regulator is installed on the connecting pipe and located between the pressurizing pump and the valve seat to regulate the flow rate of the fluid entering the valve seat; as well as Leakage metering device; The valve seat and the end cap are provided with at least one of the valve seat and the end cap, which are connected to the installation space. The leakage metering device is connected to the drainage hole and is used to collect and measure the fluid leaking from the installation space.

2. The test apparatus for measuring the leakage rate of a valve sealing surface as described in claim 1, characterized in that, The end cap has a groove on the side facing the mounting space, and the groove is used for the valve disc to be tested to be fitted and snapped in place.

3. The test apparatus for measuring the leakage rate of valve sealing surfaces as described in claim 1, characterized in that, The valve seat sealing surface has several valve seat cracks, and the formation of these valve seat cracks is similar to that of the cracks on the sealing surface of the valve disc to be tested.

4. The test apparatus for measuring the leakage rate of a valve sealing surface as described in claim 1, characterized in that, The test assembly also includes multiple simulated valve discs, each having a simulated sealing surface. The simulated valve discs can be detachably installed into the installation space, with the valve seat sealing surface fitting against the simulated sealing surface. The simulated sealing surface has several simulated cracks, which are similar to the cracks on the sealing surface of the valve disc under test. The simulated cracks on the simulated sealing surface of each simulated valve disc are different.

5. The test apparatus for measuring the leakage rate of a valve sealing surface as described in any one of claims 1 to 4, characterized in that, The test assembly also includes a pressure control console for applying pressure to the valve seat and the end cap to adjust the pressure exerted by the valve seat and the end cap on the mounting space.

6. The test apparatus for measuring the leakage rate of a valve sealing surface as described in any one of claims 1 to 4, characterized in that, The test apparatus for measuring the leakage rate of the valve sealing surface also includes a heater and a thermometer installed on the connecting pipe. The heater is located between the pressurizing pump and the flow meter to heat the fluid in the connecting pipe, and the thermometer is located between the flow meter and the valve seat to detect the temperature of the fluid flowing into the valve seat.

7. The test apparatus for measuring the leakage rate of a valve sealing surface as described in claim 6, characterized in that, The leakage metering device includes a drain pipe and a condenser. The drain pipe is connected to the drain hole, and the condenser is installed on the drain pipe and used to cool the fluid flowing into the drain pipe.

8. The test apparatus for measuring the leakage rate of a valve sealing surface as described in any one of claims 1 to 4, characterized in that, The leakage metering device also includes a storage device and a weighing device. The storage device is connected to the drainage hole via the drainage pipe to collect fluid leaking from the installation space, and the weighing device is used to weigh the storage device.

9. The test apparatus for measuring the leakage rate of a valve sealing surface as described in claim 6, characterized in that, The test apparatus for measuring the leakage rate of the valve sealing surface also includes an accumulator, which is installed between the pressurizing pump and the heater and is used to absorb excess pressure of the fluid flowing out of the pressurizing pump.

10. The test apparatus for measuring the leakage rate of a valve sealing surface as described in claim 9, characterized in that, The water tank also has a second outlet, which is connected to the connecting pipe via a bypass pipe at a position between the accumulator and the heater. The bypass pipe is equipped with a first valve, and the connecting pipe is equipped with a second valve at a position between the first outlet and the bypass pipe.

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