A device for detecting water and air seals in valve bodies

Abstract

This utility model relates to a valve body water-air seal testing device, comprising a first circular plate, a second circular plate, a double-ended stud, and valve upper and lower hole plug assemblies. Both the first and second circular plates have a plurality of circumferentially evenly distributed connecting holes. The double-ended stud is located between the first and second circular plates and corresponds to the number of connecting holes. Both ends of the double-ended stud pass through the connecting holes of the first and second circular plates, respectively. A first nut is threaded onto both ends of the double-ended stud. A pressure testing machine connector is connected to the middle of the first circular plate, away from the second circular plate. The space between the first and second circular plates is connected to the pressure testing machine connector. This structure can adapt to valve bodies of various flange sizes, eliminating the need for dedicated pressure testing equipment, and enabling the testing of the sealing performance of valves of different specifications. This significantly reduces equipment investment costs and improves testing flexibility and resource utilization.

Description

Technical Field

[0001] This utility model relates to the field of valve testing tooling technology, and in particular to a device for testing the water and air seal of valve bodies. Background Technology

[0002] In the field of valve manufacturing and quality inspection, the sealing performance of the valve body is one of the important indicators for measuring its product quality and safety reliability. Typically, valves undergo a hydrostatic sealing test or a pneumatic sealing test (hereinafter referred to as "pressure test") after production to verify the strength of the valve shell and the sealing performance of the valve seat and valve body connection. Currently, the industry commonly uses specialized valve pressure testing machines to test the sealing of flanged valve bodies. These machines are usually equipped with adjustable clamping mechanisms and sealing plates that match the valve flange dimensions, enabling rapid clamping and pressure testing of standard-sized valves.

[0003] However, in actual production processes, there are many special or non-standard situations that make it difficult to effectively apply existing general-purpose pressure testing machines. For example, for valve bodies with non-standard designs or customized production, their flange dimensions may exceed the compatibility range of conventional pressure testing machine fixtures (such as being too large or too small). Or, for some valve bodies produced in small batches or temporarily, if a pressure testing fixture is specially configured for a single specification, the cost will be high and the utilization rate will be low.

[0004] To address these issues, some companies have attempted to use customized pressure testing fixtures or modify existing equipment. However, such solutions are often costly, time-consuming to prepare, and lack versatility and reusability. Furthermore, in the absence of specialized equipment, some on-site tests employ simple sealing methods (such as blind flanges secured with bolts), but these suffer from unreliable sealing, complex operation, and poor safety, making it difficult to meet standardized pressure testing requirements.

[0005] Therefore, there is an urgent need for a valve body water-air seal testing auxiliary device that is simple in structure, low in cost, highly adaptable and reusable. It can be flexibly adapted to most valve bodies with different flange sizes and can be used with existing general pressure testing equipment without the need to purchase a special pressure testing machine, thereby improving testing efficiency, reducing production costs and ensuring testing safety and reliability. Utility Model Content

[0006] This invention proposes a device for detecting water and air tightness in valve bodies, which can be adapted to valve bodies of various flange sizes, and solves the above-mentioned problems existing in the use of existing technologies.

[0007] The technical solution of this utility model is implemented as follows: A water-air seal testing device for valve body includes a first circular plate, a second circular plate, a double-ended stud, and valve upper and lower hole plug components. Both the first and second circular plates are evenly provided with a plurality of connecting holes in the circumferential direction. The double-ended stud is located between the first and second circular plates and corresponds to the number of connecting holes. The two ends of the double-ended stud pass through the connecting holes of the first and second circular plates respectively. Both ends of the double-ended stud are threaded with a first nut. A pressure testing machine connector is connected to the middle of the first circular plate away from the second circular plate. The space between the first and second circular plates is connected to the pressure testing machine connector.

[0008] Preferably, the valve upper and lower hole plug assembly has two parts, each including an outer rubber rod, an inner rubber rod, and a second double-ended stud. The outer rubber rod and the inner rubber rod are movably fitted on the second double-ended stud. The outer rubber rod and the inner rubber rod are provided with through holes for the second double-ended stud to pass through. The two ends of the second double-ended stud are threaded with a second nut.

[0009] Preferably, both the outer rubber rod and the inner rubber rod are frustum-shaped, and the opposite side of the outer rubber rod and the inner rubber rod are tapered and concave.

[0010] Preferably, both ends of the second double-ended stud are provided with sealing gaskets, and the two sealing gaskets are respectively located between the second nut and the outer rubber rod and between the second nut and the inner rubber rod.

[0011] Preferably, a plurality of sealing ring grooves are provided on the opposite side of the first circular plate and the second circular plate.

[0012] Preferably, both the first and second circular plates are fixedly connected to a lifting ring on their upper sides.

[0013] Preferably, it also includes several third double-ended studs, the middle of which is integrally formed with a structural reinforcement platform, and a positioning stud is threaded onto the structural reinforcement platform. The positioning stud passes radially through the third double-ended stud, and a rubber retaining sleeve is fitted on one end of the positioning stud.

[0014] In summary, the beneficial effects of this utility model are as follows:

[0015] 1. This utility model uses a first circular plate and a second circular plate, with a double-ended stud and a first nut clamping and fixing the valve body between them. Combined with a pressure testing machine connector in the middle, it enables connection to external water or air pressure equipment, forming a simple and easy-to-assemble universal sealing testing device. This structure is compatible with valve bodies of most flange sizes, eliminating the need for dedicated pressure testing equipment, and enabling sealing performance testing of valves of different specifications. This significantly reduces equipment investment costs and improves testing flexibility and resource utilization.

[0016] 2. The valve upper and lower hole plug assembly is used to seal the process mounting holes on the top or side of the valve for installing the valve stem, shaft, or actuator. By setting an adjustable sealing structure consisting of an outer rubber rod, an inner rubber rod, and a second double-ended stud, it can adapt to valve stem mounting holes of different diameters and depths. After the second double-ended stud passes through the through hole of the rubber rod, axial pressure is applied through the second nuts at both ends, causing the rubber rod to be radially compressed within the hole, thereby achieving a reliable seal for the upper or side openings of the valve body. This design solves the technical problem of being unable to pressure test a blank or semi-finished valve body when the valve cover assembly is missing, and realizes independent sealing testing of the valve body body without a complete assembly. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, 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 utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0019] Figure 2 This is a side view of the present invention;

[0020] Figure 3 for Figure 2 A schematic diagram of the structure in AA section that mates with the valve body;

[0021] Figure 4 for Figure 3 A magnified view of a portion of point A in the middle;

[0022] Figure 5 This is a schematic diagram of the structure of this utility model when used with a valve body of a smaller size;

[0023] Figure 6 This is a three-dimensional structural diagram of the present invention in Embodiment 2.

[0024] In the diagram: 11. First circular plate; 12. Second circular plate; 13. Connecting hole; 14. Sealing ring groove; 15. Lifting ring; 21. Double-ended stud; 22. First nut; 30. Testing machine connector; 41. Outer rubber rod; 42. Inner rubber rod; 43. Second double-ended stud; 44. Second nut; 45. Sealing gasket; 46. Through hole; 51. Third double-ended stud; 52. Structural reinforcement platform; 53. Positioning stud; 54. Rubber support sleeve; 60. Sealing gasket. Detailed Implementation

[0025] The following will refer to the appendix in the embodiments of this utility model. Figure 1-6 The technical solutions in the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. 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.

[0026] Example 1:

[0027] In valve manufacturing, hydraulic or pneumatic sealing testing of the valve body is a crucial step in ensuring product quality. Addressing the challenge that existing pressure testing equipment is ill-suited for non-standard valve bodies of various sizes or in their raw, unfinished state, this application provides a simple, low-cost, and reusable valve body hydraulic-pneumatic sealing testing device. This device is adaptable to most valves with different flange sizes, and is particularly suitable for scenarios where standard pressure testing machine fixtures cannot hold the valves or where specialized tooling is unavailable. It effectively utilizes existing pressure testing equipment to complete sealing tests without the need for additional specialized equipment.

[0028] like Figures 1 to 5 As shown, this utility model discloses a valve body water-air seal testing device, including a first circular plate 11, a second circular plate 12, a double-ended stud 21, and valve upper and lower hole plug assemblies. The outer dimensions of the first circular plate 11 and the second circular plate 12 are designed according to the specifications of commonly used large valve body flanges. Of course, there can also be multiple first circular plates 11 and second circular plates 12 of different sizes, so that it can be applied to a wider range of valve bodies. The first circular plate 11 and the second circular plate 12 can be made of carbon steel or stainless steel, and have sufficient structural strength to withstand the pressure load during the pressure test. The first circular plate 11 and the second circular plate 12 have multiple connecting holes 13 evenly distributed circumferentially along their edge regions. Double-ended studs 21 are located between the first and second circular plates 11 and correspond to the number of connecting holes 13. Both ends of the double-ended studs 21 pass through the connecting holes 13 of the first and second circular plates 11 and 12, respectively. First nuts 22 are threaded onto both ends of the double-ended studs 21, allowing the valve body to be locked between the first and second circular plates 11 and 12, forming a closed pressure chamber. A pressure testing machine connector 30 is connected to the middle of the first circular plate 11, away from the second circular plate 12. The space between the first and second circular plates 11 is connected to the pressure testing machine connector 30. This connector can be an existing quick connector, threaded connector, or flange interface, enabling reliable connection to the water or air pipes of existing pressure testing equipment. The test medium enters the internal space enclosed by the two circular plates and the valve body through this connector, achieving pressure testing of the valve body.

[0029] To seal the process holes on the upper or lower part of the valve body used for mounting the valve stem, shaft, or actuator, the valve upper and lower hole plugging assembly has two components, each including an outer rubber rod 41, an inner rubber rod 42, and a second double-ended stud 43. The outer rubber rod 41 and the inner rubber rod 42 are movably fitted onto the second double-ended stud 43. Through holes 46 are provided on the outer rubber rod 41 and the inner rubber rod 42 for the second double-ended stud 43 to pass through. Second nuts 44 are threaded onto both ends of the second double-ended stud 43. Both the outer rubber rod 41 and the inner rubber rod 42 are frustum-shaped, with one side of the outer rubber rod 41 and the inner rubber rod 42 tapering towards the opposite side. By rotating the second nut 44, axial pressure is applied, pushing the outer rubber rod 41 and the inner rubber rod 42 closer together. This causes radial compression of their tapered end faces, resulting in a tight seal against the inner wall of the valve stem mounting hole, achieving a reliable seal. To prevent leakage from the through hole, sealing gaskets 45 are provided at both ends of the second double-ended stud 43. The two sealing gaskets 45 are located between the second nut 44 and the outer rubber rod 41 and between the second nut 44 and the inner rubber rod 42, respectively. The sealing gaskets 45 can further seal the through hole 46. This sealing structure is suitable for installation holes of different diameters and depths, and is especially suitable for the independent pressure testing requirements of the blank valve body before the valve cover is installed.

[0030] To enhance sealing performance, several annular sealing grooves 14 are respectively provided on the side of the first circular plate 11 and the second circular plate 12 that contact the valve body flange. Rubber O-rings or other elastic sealing elements are installed in the grooves. When the two circular plates are tightened by nuts, the sealing rings are deformed under pressure, filling the tiny gap between the circular plates and the flange end face to prevent leakage of the test pressure medium. In addition, sealing gaskets 60 can also be provided at the contact positions of the first circular plate 11 and the second circular plate 12 with the valve body flange to further enhance sealing performance.

[0031] Both the first circular plate 11 and the second circular plate 12 are fixedly connected to lifting rings 15 on their upper sides, facilitating the hoisting, handling, and positioning of the entire device and the valve body under test. Especially during the testing of large-sized, heavy valve bodies, assembly and disassembly can be quickly completed using lifting equipment, reducing manual labor intensity and improving work efficiency and safety. This is particularly suitable for frequent use scenarios in workshops or pressure testing platforms.

[0032] During use, first insert the upper and lower hole plug assemblies into the valve stem mounting holes on the top and bottom of the valve body, respectively. If the valve body only has a valve stem mounting hole at the top and the bottom is sealed, then only the upper and lower hole plug assemblies need to be installed on the top of the valve body. After the upper and lower hole plug assemblies are adjusted to the correct position, tighten the second nut 44 to seal the upper and lower holes of the valve body with the rubber rod seal. It should be noted that the upper and lower hole plug assemblies can be available in various sizes to better fit different valve body sizes. Then, pass the double-ended stud 21 through the bolt holes on the valve body flange (if the holes match). If the valve body is small, it is not necessary to pass the double-ended stud 21 through the bolt holes on the valve body flange; simply clamp the valve body between the two circular plates. Then, place the first circular plate 11 and the second circular plate 12 on both sides of the valve body, inserting the two ends of the double-ended stud 21 into the connecting holes 13 of the first circular plate 11 and the second circular plate 12. Then, tighten the first nut 22 to pull the two circular plates together, completing the assembly of the main sealing structure. Finally, connect the pressure testing machine connector 30 to the external pressure testing equipment and inject water or gas for pressure testing.

[0033] Example 2,

[0034] like Figure 6 As shown, in this embodiment, for some smaller valve bodies, the clamping force provided by the double-ended studs 21 and the first nut 22 alone may not be sufficient to ensure stability during the pressure test. Therefore, this embodiment also includes several third double-ended studs 51. A structural reinforcing platform 52 is integrally formed in the middle of the third double-ended studs 51. A positioning stud 53 is threaded onto the structural reinforcing platform 52, and the positioning stud 53 radially passes through the third double-ended studs 51. A rubber retaining sleeve 54 is fitted onto one end of the positioning stud 53. When the smaller valve body is clamped between the first circular plate 11 and the second circular plate 12, several of the double-ended studs 21 can be replaced with third double-ended studs 51. By rotating the positioning studs 53, the rubber retaining sleeve 54 at its end can be pressed against the outer wall of the valve body or reinforcing ribs, providing additional lateral restraint and preventing the valve body from shifting or vibrating during pressurization. The rubber retaining sleeve 54 prevents direct metal-to-valve body contact, preventing scratches or indentations and protecting the product's appearance quality.

[0035] It should also be noted that the terms used in this utility model, such as "front", "rear", "vertical", "horizontal", 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 utility model 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 limiting the scope of protection of this utility model.

[0036] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A device for detecting water and air seals in valve bodies, characterized in that: The device includes a first circular plate, a second circular plate, a double-ended stud, and valve upper and lower hole plugs. Both the first and second circular plates have a number of circumferentially evenly distributed connecting holes. The double-ended stud is located between the first and second circular plates and corresponds to the number of connecting holes. Both ends of the double-ended stud pass through the connecting holes of the first and second circular plates, respectively. A first nut is threaded onto both ends of the double-ended stud. A pressure testing machine connector is connected to the middle of the first circular plate away from the second circular plate. The space between the first and second circular plates is connected to the pressure testing machine connector.

2. The valve body water-air seal detection device according to claim 1, characterized in that: The valve upper and lower hole plug assembly has two parts, each including an outer rubber rod, an inner rubber rod, and a second double-ended stud. The outer rubber rod and the inner rubber rod are movably fitted on the second double-ended stud. The outer rubber rod and the inner rubber rod are provided with through holes for the second double-ended stud to pass through. The two ends of the second double-ended stud are threaded with a second nut.

3. The valve body water-air seal detection device according to claim 2, characterized in that: Both the outer rubber rod and the inner rubber rod are frustum-shaped, and the opposite side of the outer rubber rod and the inner rubber rod are tapered and concave.

4. A valve body water-air seal detection device according to claim 2 or 3, characterized in that: The second double-ended stud is provided with sealing gaskets at both ends, and the two sealing gaskets are respectively located between the second nut and the outer rubber rod and between the second nut and the inner rubber rod.

5. The valve body water-air seal detection device according to claim 1, characterized in that: Several sealing ring grooves are provided on the opposite side of the first and second circular plates.

6. The valve body water-air seal detection device according to claim 1, characterized in that: Both the first and second circular plates are fixedly connected to lifting rings on their upper sides.

7. The valve body water-air seal detection device according to claim 1, characterized in that: It also includes several third double-ended studs, the middle of which is integrally formed with a structural reinforcement platform. A positioning stud is threaded onto the structural reinforcement platform. The positioning stud passes radially through the third double-ended stud, and a rubber retaining sleeve is fitted on one end of the positioning stud.

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