A blind plate for valve pressure test and a plugging structure for valve pressure test

Abstract

This application relates to the field of valve testing technology, and provides a blind flange for valve pressure testing. The blind flange has a through hole for communicating with the valve cavity, and the through hole extends through the blind flange along its thickness. The through hole is configured such that when the blind flange is installed on the valve, the through hole is adjacent to either the lowest point or the highest point of the inner wall of the valve interface. When testing the valve, both interfaces of the valve are equipped with the blind flange of this application. The through hole of one blind flange is adjacent to the lowest point of the inner wall of the valve interface, and the through hole of the other blind flange is adjacent to the highest point of the inner wall of the other valve interface. The through holes on the two blind flanges are arranged in a low-high configuration, which allows for good venting during hydrostatic testing. Furthermore, during subsequent airtightness testing, it is not necessary to remove the blind flange for drainage, and the drainage effect is good. This application improves testing efficiency and result accuracy. This application also provides a sealing structure for valve pressure testing.

Description

Technical Field

[0001] This application relates to the field of valve testing technology, and in particular to a blind flange for valve pressure testing and a sealing structure for valve pressure testing. Background Technology

[0002] When performing a hydrostatic test on a valve, a blind flange is needed to seal both ends of the valve. If the air inside the valve cavity is not completely purged during water injection, it will be continuously compressed as the pressure increases during the hydrostatic test. This increases the time required for the pressure to build up, affecting operational efficiency. Furthermore, the rapid expansion of gas upon depressurization after the hydrostatic test poses a safety hazard. Additionally, the presence of gas inside the cavity during the hydrostatic test will affect the test results. Another point to note is that a high-pressure airtightness test is typically performed after the hydrostatic test. If the water inside the valve cavity is not completely purged during this test, it will affect the subsequent airtightness test.

[0003] The through-hole on existing blind flanges, which connects to the valve cavity, is typically located in the center of the flange. During hydrostatic testing, this type of blind flange prevents a significant amount of gas from escaping from the valve cavity. Furthermore, if an airtightness test is to be conducted after the hydrostatic test, the blind flange usually needs to be removed for drainage to minimize the impact of water in the valve cavity on the airtightness test. After drainage, the blind flange must be reinstalled on the valve interface, which significantly reduces testing efficiency. Utility Model Content

[0004] To address the aforementioned problems, this application provides a blind flange for valve pressure testing and a sealing structure for valve pressure testing. When testing a valve, the blind flange of this application is installed at both ports of the valve. The through-hole of one blind flange is adjacent to the lowest point of the inner wall of the valve port, while the through-hole of the other blind flange is adjacent to the highest point of the inner wall of the other valve port. The through-holes on the two blind flanges are arranged in a staggered pattern, resulting in good venting during the hydrostatic test. Furthermore, during subsequent airtightness tests, it is not necessary to disassemble the blind flanges for drainage, and the drainage effect is good. This application improves testing efficiency and result accuracy. The technical solution adopted in this application is as follows:

[0005] A blind flange for valve pressure testing has a through hole for communicating with the valve cavity. The through hole extends through the blind flange along its thickness direction. The through hole is configured such that when the blind flange is installed on the valve, the through hole is adjacent to either the lowest point or the highest point of the inner wall of the valve interface.

[0006] In some embodiments, the through-hole of the blind flange is connected to a conduit; the conduit is configured such that when the blind flange is installed on the valve and the through-hole is adjacent to the lowest point of the inner wall of the valve interface, the other end of the conduit is located at the low point of the cavity, or when the blind flange is installed on the valve and the through-hole is adjacent to the highest point of the inner wall of the valve interface, the other end of the conduit is located at the high point of the cavity.

[0007] In some embodiments, the conduit is a shape-adjustable flexible tube that can be bent arbitrarily and oriented in a defined direction.

[0008] In some embodiments, the conduit is elastic and L-shaped. During the installation of the blind flange onto the valve, the conduit can undergo elastic deformation to allow it to enter the cavity; during the removal of the blind flange, the conduit can undergo elastic deformation to allow it to be removed from the cavity.

[0009] In some embodiments, the through hole of the blind plate is connected to a section of non-shaped flexible hose, the other end of which is connected to a sinker that will not float under the buoyancy of water. The sinker has a hole that communicates with the non-shaped flexible hose.

[0010] In some embodiments, the through hole of the blind plate is connected to a section of non-shaped flexible hose, the other end of which is connected to a float. The float will float under the buoyancy of the water, and the float has holes that communicate with the non-shaped flexible hose.

[0011] On the other hand, this application provides a sealing structure for valve pressure testing, including a valve and two identical blind plates. The valve includes two ports, and the two blind plates are respectively installed in one of the two ports. Each of the two blind plates is provided with a through hole for communicating with the cavity of the valve. The through hole penetrates the blind plate along its thickness direction. When the two blind plates are installed on the valve, the through hole of one blind plate is adjacent to the lowest point of the inner wall of the valve port, and the through hole of the other blind plate is adjacent to the highest point of the inner wall of the other port of the valve.

[0012] In some embodiments, the through hole of the blind plate is connected to a conduit; the two blind plates are a first blind plate and a second blind plate, the through hole of the first blind plate is adjacent to the lowest point of the inner wall of the valve interface, and the other end of the conduit connected to the first blind plate is located at the low point of the cavity; the through hole of the second blind plate is adjacent to the highest point of the inner wall of the other interface of the valve, and the other end of the conduit connected to the second blind plate is located at the high point of the cavity.

[0013] In some embodiments, the conduit is a shape-adjustable flexible tube that can be bent arbitrarily and have its direction determined;

[0014] Alternatively, the conduit has a certain degree of elasticity and is L-shaped overall. During the process of installing the blind flange onto the valve, the conduit can undergo elastic deformation to allow the conduit to enter the cavity; during the process of removing the blind flange, the conduit can undergo elastic deformation to allow the conduit to be removed from the cavity.

[0015] In some embodiments, the through hole of the blind plate is connected to a section of non-shaped flexible hose; the two blind plates are a first blind plate and a second blind plate, the through hole of the first blind plate is adjacent to the lowest point of the inner wall of the valve interface, the other end of the non-shaped flexible hose connected to the first blind plate is connected to a sinker, the sinker will not float under the buoyancy of water, the sinker has a hole, the hole is connected to the non-shaped flexible hose; the through hole of the second blind plate is adjacent to the highest point of the inner wall of the other interface of the valve, the other end of the non-shaped flexible hose connected to the second blind plate is connected to a floater, the floater will float under the buoyancy of water, the floater has a hole, the hole is connected to the non-shaped flexible hose.

[0016] The blind flange and sealing structure for valve pressure testing provided in this application have at least one of the following beneficial effects:

[0017] 1. The through holes on the blind flange are configured such that when the blind flange is installed on the valve, the through holes are adjacent to either the lowest point or the highest point of the inner wall of the valve interface. When testing the valve, both interfaces of the valve are equipped with the blind flanges of this application. One blind flange has its through hole adjacent to the lowest point of the inner wall of the valve interface, and the other blind flange has its through hole adjacent to the highest point of the inner wall of the other valve interface. The through holes of the two blind flanges on the valve are arranged in a low-high configuration. In this way, during the water injection phase of the hydrostatic test, water is injected into the valve cavity through the lower through hole, while air is released through the higher through hole, thus achieving a better venting effect. Before the subsequent airtightness test, there is no need to disassemble the blind flanges to drain water; the water in the valve cavity can be drained through the lower through hole, and the drainage effect is good. Using the blind flanges of this application can improve testing efficiency and result accuracy. Furthermore, the blind flanges installed on the two valve interfaces can be identical; only the through hole needs to be lower than the other during installation, thus improving the versatility of the blind flanges and reducing production costs.

[0018] 2. By configuring the conduit so that when the blind flange is installed on the valve and the through-hole is adjacent to the lowest point of the valve interface's inner wall, the other end of the conduit is located at the lowest point of the cavity (meaning a position within the cavity lower than the lowest point of the interface's inner wall), drainage can be carried out through the conduit in this case, and the drainage is relatively thorough, removing most of the water from the cavity, ensuring the efficiency and accuracy of the airtightness test results. Conversely, by configuring the conduit so that when the blind flange is installed on the valve and the through-hole is adjacent to the highest point of the valve interface's inner wall, the other end of the conduit is located at the highest point of the cavity (meaning a position within the cavity higher than the highest point of the interface's inner wall), venting can be carried out through the conduit in this case, and the venting is relatively thorough, removing most of the gas from the cavity, ensuring the efficiency and accuracy of the hydrostatic test results.

[0019] 3. By connecting a non-shaped flexible tube to the through hole of the blind plate, and connecting the other end of the non-shaped flexible tube to a sinker, since the height of the sinker does not change with the water level in the cavity, the hole on the sinker is always located at the lowest point of the cavity. Here, "lowest point" means a position in the cavity that is lower than the lowest point of the inner wall of the interface. In this case, drainage can be carried out through the hole on the sinker, and the drainage is relatively thorough, which can drain most of the water in the cavity, ensuring the efficiency and accuracy of the airtightness test results.

[0020] 4. By connecting a non-shaped flexible tube to the through hole of the blind plate, and connecting the other end of the non-shaped flexible tube to a float, when there is water in the cavity, the height of the float will change with the water level in the cavity. The float will always float on the water surface, so the hole on the float will always be higher than the water level in the cavity. In this case, air can be vented through the hole on the float, and the venting is relatively thorough, which can remove most of the gas in the cavity, ensuring the efficiency and accuracy of the hydrostatic test. Attached Figure Description

[0021] The preferred embodiments will now be described in a clear and easy-to-understand manner, with reference to the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages, and implementation methods of a blind flange for valve pressure testing and a sealing structure for valve pressure testing:

[0022] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application (water injection state / venting state);

[0023] Figure 2 This is a schematic diagram of the overall structure of an embodiment of this application (inflated state / drained state);

[0024] Figure 3 This is a schematic diagram of the overall structure of another embodiment of this application (water injection state / venting state);

[0025] Figure 4This is a schematic diagram of the overall structure of another embodiment of this application (inflated state / drained state);

[0026] Figure 5 This is a schematic diagram of the overall structure of another embodiment of this application (water injection state / venting state);

[0027] Figure 6 This is a schematic diagram of the overall structure of another embodiment of this application (inflated state / drained state).

[0028] Explanation of icon numbers:

[0029] Blind flange 1, through hole 2, valve 3, conduit 4, non-shaped hose 5, sinking component 6, floating component 7, first blind flange 8, second blind flange 9. Detailed Implementation

[0030] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the specific implementation methods of this application will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without creative effort.

[0031] To keep the drawings concise, each drawing only schematically shows the parts relevant to this application, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of the components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."

[0032] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0033] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0034] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0035] refer to Figures 1-6 This application provides a blind plate for valve pressure testing. The blind plate 1 has a through hole 2 for communicating with the cavity of the valve 3. The through hole 2 penetrates the blind plate 1 along the thickness direction. The through hole 2 is configured such that when the blind plate 1 is installed on the valve 3, the through hole 2 is close to the lowest point of the inner wall of the valve 3 interface or the highest point of the inner wall of the valve 3 interface.

[0036] By employing the blind plate 1 of this embodiment, when testing the valve 3, both ports of the valve 3 are equipped with the blind plate 1 of this application. The through-hole 2 of one blind plate 1 is adjacent to the lowest point of the inner wall of the valve 3 port, and the through-hole 2 of the other blind plate 1 is adjacent to the highest point of the inner wall of the other port of the valve 3. The through-holes 2 of the two blind plates 1 on the valve 3 are arranged in a low-high configuration. In this way, during the water injection phase of the water pressure test, water is injected into the valve 3 cavity through the lower through-hole 2, while air is expelled through the higher through-hole 2, thus achieving a better venting effect. Before the subsequent airtightness test, there is no need to disassemble the blind plate 1 to drain water; the water in the valve 3 cavity can be drained through the lower through-hole 2, and the drainage effect is good. Employing the blind plate 1 of this application can improve test efficiency and result accuracy. Furthermore, the blind plates 1 installed on the two ports of the valve 3 can be identical; only one through-hole 2 needs to be lower than the other during installation, thus improving the versatility of the blind plate 1 and reducing production costs.

[0037] refer to Figure 3 , Figure 4 In one embodiment, the through hole 2 of the blind plate 1 is connected to a conduit 4; the conduit 4 is configured such that when the blind plate 1 is installed on the valve 3 and the through hole 2 is adjacent to the lowest point of the inner wall of the valve 3 interface, the other end of the conduit 4 is located at the low point of the cavity, or when the blind plate 1 is installed on the valve 3 and the through hole 2 is adjacent to the highest point of the inner wall of the valve 3 interface, the other end of the conduit 4 is located at the high point of the cavity.

[0038] It is worth noting that by configuring the conduit 4 such that when the blind flange 1 is installed on the valve 3 and the through hole 2 is adjacent to the lowest point of the inner wall of the valve 3 interface, the other end of the conduit 4 is located at the lowest point of the cavity. Here, "lowest point" refers to a position within the cavity lower than the lowest point of the inner wall of the interface. In this case, drainage can be carried out through the conduit 4, and the drainage is relatively thorough, removing most of the water from the cavity, ensuring the efficiency and accuracy of the airtightness test results. Conversely, by configuring the conduit 4 such that when the blind flange 1 is installed on the valve 3 and the through hole 2 is adjacent to the highest point of the inner wall of the valve 3 interface, the other end of the conduit 4 is located at the highest point of the cavity. Here, "highest point" refers to a position within the cavity higher than the highest point of the inner wall of the interface. In this case, venting can be carried out through the conduit 4, and the venting is relatively thorough, removing most of the gas from the cavity, ensuring the efficiency and accuracy of the hydrostatic test results.

[0039] In one specific embodiment, the conduit 4 is a shape-adjustable flexible tube, which can be bent arbitrarily and oriented in a defined direction. Preferably, the shape-adjustable flexible tube is a metal shape-adjustable flexible tube (gooseneck tube).

[0040] In another specific embodiment, the conduit 4 has a certain elasticity and is L-shaped as a whole. During the process of installing the blind flange 1 on the valve 3, the conduit 4 can undergo elastic deformation to allow the conduit 4 to enter the cavity; during the process of removing the blind flange 1, the conduit 4 can undergo elastic deformation to allow the conduit 4 to be removed from the cavity.

[0041] refer to Figure 5 , Figure 6 In one embodiment, a section of non-shaped flexible hose 5 is connected to the through hole 2 of the blind plate 1. The other end of the non-shaped flexible hose 5 is connected to a sinker 6. The sinker 6 will not float under the buoyancy of water. The sinker 6 is provided with a hole, which is connected to the non-shaped flexible hose 5.

[0042] Specifically, the non-shaped hose 5 is only in contrast to the shapeable hose mentioned earlier; the non-shaped hose 5 can move freely. It is easy to understand that by connecting the non-shaped hose 5 to the through hole 2 of the blind plate 1, and connecting the other end of the non-shaped hose 5 to a recessed member 6, since the height of the recessed member 6 does not change with the water level in the cavity, the hole on the recessed member 6 is always located at the lowest point of the cavity. Here, "lowest point" refers to a position in the cavity lower than the lowest point of the inner wall of the interface. In this case, drainage can be carried out through the hole on the recessed member 6, and the drainage is relatively thorough, removing most of the water from the cavity, ensuring the efficiency and accuracy of the airtightness test results.

[0043] refer to Figure 5 , Figure 6 In one embodiment, a section of non-shaped flexible hose 5 is connected to the through hole 2 of the blind plate 1. The other end of the non-shaped flexible hose 5 is connected to a float 7. The float 7 will float under the buoyancy of the water. The float 7 is provided with holes that are connected to the non-shaped flexible hose 5.

[0044] Specifically, the non-shaped hose 5 is only in contrast to the shapeable hose mentioned earlier; the non-shaped hose 5 can move freely. It is understood that by connecting the non-shaped hose 5 to the through hole 2 of the blind plate 1, and with a float 7 connected to the other end of the non-shaped hose 5, when there is water in the cavity, the height of the float 7 will change with the water level in the cavity. The float 7 will always float on the water surface, so the hole on the float 7 will always be higher than the water level in the cavity. In this case, air can be vented through the hole on the float 7, and the venting is relatively thorough, allowing most of the gas in the cavity to be expelled, ensuring the efficiency and accuracy of the hydrostatic test results.

[0045] On the other hand, reference Figures 1-6This application also provides a sealing structure for valve pressure testing, including a valve 3 and two identical blind plates 1. The valve 3 includes two interfaces, and the two blind plates 1 are respectively installed in one of the two interfaces. Each of the two blind plates 1 is provided with a through hole 2, which is used to communicate with the cavity of the valve 3. The through hole 2 penetrates the blind plate 1 along the thickness direction. When the two blind plates 1 are installed on the valve 3, the through hole 2 of one blind plate 1 is close to the lowest point of the inner wall of the interface of the valve 3, and the through hole 2 of the other blind plate 1 is close to the highest point of the inner wall of the other interface of the valve 3.

[0046] It is understandable that the through holes 2 of the two blind flanges 1 on valve 3 are arranged in a staggered pattern, one lower and one higher. This allows water to be injected into the valve 3 cavity through the lower through hole 2 during the water pressure test, while air is released through the higher through hole 2, thus achieving better venting. Before the subsequent airtightness test, there is no need to disassemble the blind flanges 1 to drain water; the water in the valve 3 cavity can be drained through the lower through hole 2, with good drainage. Using the blind flange 1 of this application can improve test efficiency and result accuracy.

[0047] refer to Figure 3 , Figure 4 In one embodiment, a conduit 4 is connected to the through hole 2 of the blind plate 1; the two blind plates 1 are a first blind plate 8 and a second blind plate 9, respectively. The through hole 2 of the first blind plate 8 is close to the lowest point of the inner wall of the valve 3 interface, and the other end of the conduit 4 connected to the first blind plate 8 is located at the low point of the cavity; the through hole 2 of the second blind plate 9 is close to the highest point of the inner wall of the other interface of the valve 3, and the other end of the conduit 4 connected to the second blind plate 9 is located at the high point of the cavity.

[0048] Specifically, in this embodiment, "lower point" refers to a position within the cavity that is lower than the lowest point of the inner wall of the interface, and "higher point" refers to a position within the cavity that is higher than the highest point of the inner wall of the interface. By placing the other end of the conduit 4 connecting the first blind plate 8 at the lower point of the cavity, drainage can be carried out through the conduit 4 in this case, and the drainage is relatively thorough, removing most of the water from the cavity, ensuring the efficiency and accuracy of the airtightness test results. By placing the other end of the conduit 4 connecting the second blind plate 9 at the higher point of the cavity, venting can be carried out through the conduit 4 in this case, and the venting is relatively thorough, removing most of the gas from the cavity, ensuring the efficiency and accuracy of the hydrostatic test results.

[0049] In one specific embodiment, the conduit 4 is a shape-adjustable flexible tube, which can be bent arbitrarily and oriented in a defined direction. Preferably, the shape-adjustable flexible tube is a metal shape-adjustable flexible tube (gooseneck tube).

[0050] In another specific embodiment, the conduit 4 has a certain elasticity and is L-shaped as a whole. During the process of installing the blind flange 1 on the valve 3, the conduit 4 can undergo elastic deformation to allow the conduit 4 to enter the cavity; during the process of removing the blind flange 1, the conduit 4 can undergo elastic deformation to allow the conduit 4 to be removed from the cavity.

[0051] refer to Figure 5 , Figure 6 In one embodiment, a section of non-shaped flexible hose 5 is connected to the through hole 2 of the blind plate 1; the two blind plates 1 are a first blind plate 8 and a second blind plate 9, respectively. The through hole 2 of the first blind plate 8 is close to the lowest point of the inner wall of the valve 3 interface. The other end of the non-shaped flexible hose 5 connected to the first blind plate 8 is connected to a sinker 6. The sinker 6 will not float under the buoyancy of the water. The sinker 6 has a hole that communicates with the non-shaped flexible hose 5. The through hole 2 of the second blind plate 9 is close to the highest point of the inner wall of the other interface of the valve 3. The other end of the non-shaped flexible hose 5 connected to the second blind plate 9 is connected to a floater 7. The floater 7 will float under the buoyancy of the water. The floater 7 has a hole that communicates with the non-shaped flexible hose 5.

[0052] Specifically, the non-shaped hose 5 is only in contrast to the shapeable hose mentioned earlier; the non-shaped hose 5 can move freely. It is worth noting that the non-shaped hose 5 is connected to the through hole 2 of the first blind plate 8, and the other end of the non-shaped hose 5 is connected to a sinker 6. Since the height of the sinker 6 does not change with the water level in the cavity, the hole on the sinker 6 is always located at the lowest point of the cavity. Here, "lowest point" refers to a position in the cavity lower than the lowest point of the inner wall of the interface. In this case, drainage can be carried out through the hole on the sinker 6, and the drainage is relatively thorough, removing most of the water from the cavity, ensuring the efficiency and accuracy of the airtightness test results.

[0053] In addition, by connecting a non-shaped flexible hose 5 to the through hole 2 of the second blind plate 9, and connecting a float 7 to the other end of the non-shaped flexible hose 5, when there is water in the cavity, the height of the float 7 will change with the water level in the cavity. The float 7 will always float on the water surface, so the hole on the float 7 will always be higher than the water level in the cavity. In this case, air can be vented through the hole on the float 7, and the venting is relatively thorough, which can remove most of the gas in the cavity, ensuring the efficiency and accuracy of the hydrostatic test.

[0054] It should be noted that the above embodiments can be freely combined as needed. The above are merely preferred embodiments of this application. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A blind plate for valve pressure testing, characterized in that, The blind flange has a through hole for communicating with the cavity of the valve. The through hole extends through the blind flange along its thickness direction. The through hole is configured such that when the blind flange is installed on the valve, the through hole is adjacent to the lowest point of the inner wall of the valve interface or the highest point of the inner wall of the valve interface.

2. A blind plate for valve pressure testing according to claim 1, characterized in that The blind flange has a through hole connected to a conduit; the conduit is configured such that when the blind flange is installed on the valve and the through hole is adjacent to the lowest point of the inner wall of the valve interface, the other end of the conduit is located at the low point of the cavity, or when the blind flange is installed on the valve and the through hole is adjacent to the highest point of the inner wall of the valve interface, the other end of the conduit is located at the high point of the cavity.

3. A blind plate for valve pressure testing according to claim 2, characterized in that The conduit is a shape-adjustable flexible tube, which can be bent arbitrarily and its direction can be determined.

4. A blind plate for valve pressure testing according to claim 2, characterized in that The conduit has a certain degree of elasticity and is L-shaped overall. During the process of installing the blind flange onto the valve, the conduit can undergo elastic deformation to allow the conduit to enter the cavity; during the process of removing the blind flange, the conduit can undergo elastic deformation to allow the conduit to be removed from the cavity.

5. A blind plate for valve pressure testing according to claim 1, characterized in that, The blind plate has a through hole connected to a section of non-shaped flexible hose. The other end of the non-shaped flexible hose is connected to a sinker. The sinker will not float under the buoyancy of water. The sinker has a hole that communicates with the non-shaped flexible hose.

6. A blind plate for valve pressure testing according to claim 1, characterized in that The blind plate has a through hole connected to a section of non-shaped flexible hose. The other end of the non-shaped flexible hose is connected to a float. The float will float under the buoyancy of the water. The float has a hole that communicates with the non-shaped flexible hose.

7. A plugging configuration for valve pressure testing, characterized by, The device includes a valve and two identical blind flanges. The valve has two ports, and the two blind flanges are respectively installed in one of the two ports. Each blind flange has a through hole for communicating with the cavity of the valve. The through hole extends through the blind flange along its thickness direction. When the two blind flanges are installed on the valve, the through hole of one blind flange is adjacent to the lowest point of the inner wall of the valve port, and the through hole of the other blind flange is adjacent to the highest point of the inner wall of the other port of the valve.

8. A plugging arrangement for valve pressure testing according to claim 7, wherein, The through hole of the blind plate is connected to a conduit; the two blind plates are a first blind plate and a second blind plate, the through hole of the first blind plate is adjacent to the lowest point of the inner wall of the valve interface, and the other end of the conduit connected to the first blind plate is located at the low point of the cavity; the through hole of the second blind plate is adjacent to the highest point of the inner wall of the other interface of the valve, and the other end of the conduit connected to the second blind plate is located at the high point of the cavity.

9. A blind plate for valve pressure testing according to claim 8, characterized in that The conduit is a shape-determinable flexible tube, which can be bent arbitrarily and have its direction determined; Alternatively, the conduit has a certain degree of elasticity and is L-shaped overall. During the process of installing the blind flange onto the valve, the conduit can undergo elastic deformation to allow the conduit to enter the cavity; during the process of removing the blind flange, the conduit can undergo elastic deformation to allow the conduit to be removed from the cavity.

10. A blind flange for valve pressure testing according to claim 7, characterized in that, The through hole of the blind plate is connected to a section of non-shaped flexible hose; the two blind plates are a first blind plate and a second blind plate. The through hole of the first blind plate is adjacent to the lowest point of the inner wall of the valve interface. The other end of the non-shaped flexible hose connected to the first blind plate is connected to a sinker. The sinker will not float under the buoyancy of the water. The sinker has a hole that communicates with the non-shaped flexible hose. The through hole of the second blind plate is adjacent to the highest point of the inner wall of the other interface of the valve. The other end of the non-shaped flexible hose connected to the second blind plate is connected to a floater. The floater will float under the buoyancy of the water. The floater has a hole that communicates with the non-shaped flexible hose.

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