An on-line observation device for valve leakage

Abstract

The present invention relates to an on-line valve leakage observation device, which comprises a valve body and a valve gate assembly arranged in the valve body. One end of the valve body is provided with a connecting flange, an internal pressure ring is sleeved in the connecting flange, the internal pressure ring is closely attached to the valve body, and a window is hermetically installed in the internal pressure ring. This on-line valve leakage observation device does not require the use of professional equipment when detecting valve leakage, and has relatively low requirements for the professional ability of monitoring personnel, and is suitable for efficient and low-cost leakage detection operations at specific workstations of pipelines; the protection component can protect the window in the device and clean the surface, and is convenient for disassembly and use; it can relieve abnormal pressure in the valve body to avoid damage to personnel caused by the breakage of weak parts of the device, and improves the safety and reliability of internal leakage monitoring of the valve.

Description

Technical Field

[0001] The present invention relates to the field of on-line monitoring of valves, and particularly to an on-line observation device for valve leakage. Background Art

[0002] A valve is a control device used to regulate the direction, pressure, and flow rate of a fluid in a fluid system, and is used to make the medium in the piping and equipment flow or stop.

[0003] Before the valve is assembled with the pipeline, it is usually necessary to monitor its internal leakage. This process has high professional requirements for monitoring equipment and personnel configuration, and has the disadvantages of high monitoring cost and low efficiency. Therefore, it is necessary to design a device with low cost and easy operation to meet the needs of on-line monitoring of valve leakage. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: in order to overcome the deficiencies of the prior art, an on-line observation device for valve leakage is provided.

[0005] In order to achieve the above technical effects, the technical solution adopted by the present invention is: an on-line observation device for valve leakage, including a valve body and a valve gate assembly disposed in the valve body. One end of the valve body is provided with a connecting flange, an internal pressure ring is sleeved in the connecting flange, the internal pressure ring is closely attached to the valve body, and a window is hermetically installed in the internal pressure ring.

[0006] Further, connecting bodies are provided at both ends of the valve body, and the connecting bodies and the connecting flange are fixed by bolt connection.

[0007] Further, one end of the internal pressure ring radially extends towards the inside and outside of the ring to form a ring plate portion. One side of the ring plate portion is closely attached to the end face of the connecting flange, and a sealing gasket is provided between the other side and the end face of the connecting body.

[0008] Further, the sealing gasket is made of an elastic material, and both sides of the sealing gasket are in a serrated structure.

[0009] Further, the window is made of transparent plastic, an outer winding gasket is provided between one side of the window and the connecting flange, and an inner winding gasket is provided between the other side and the ring plate portion.

[0010] Further, a packing groove is provided between the periphery of the window and the inner circle of the internal pressure ring, and a sealing assembly is provided in the packing groove. The sealing assembly is composed of an outer pressure ring, a trapezoidal outer sealing ring, a rectangular graphite packing, and a trapezoidal inner sealing ring that are closely arranged in sequence.

[0011] Further, a plurality of pressing shafts are threadedly penetrated through the connecting flange. The length direction of the pressing shafts is consistent with the axis direction of the connecting flange, and one end of the pressing shafts abuts against the outer pressure ring.

[0012] Furthermore, protective components are provided on both sides of the viewing window. The protective components include a protective plate, an elastic layer, and a bottom plate that are connected in sequence. A groove is formed on the side of the protective plate away from the elastic layer, and a handle that can be turned outwards is arranged in the groove. A wiping cloth is arranged at one end of the bottom plate away from the elastic layer, and the wiping cloth is closely attached to the viewing window.

[0013] Furthermore, the protective plate is made of a hard material, and the elastic layer is composed of multiple springs evenly distributed circumferentially along the inner circle of the connecting flange.

[0014] Furthermore, a pressure relief flow channel is arranged in the ring plate portion. One end of the pressure relief flow channel communicates with the medium flow channel of the valve body, and the other end is connected with a pressure relief valve. The pressure relief valve is located between the connecting flange and the connecting body.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] 1. When detecting valve leakage, professional equipment is not required, and the professional ability requirements for monitoring personnel are relatively low, which is suitable for efficient and low-cost leakage detection operations at specific workstations of pipelines;

[0017] 2. The protective component can protect the viewing window in the device and clean its surface, and is convenient for disassembly and use;

[0018] 3. The abnormal pressure in the valve body can be relieved, avoiding damage to personnel caused by the breakage of weak parts of the device, and improving the safety and reliability of valve internal leakage monitoring.

[0019] The above description is only an overview of the technical solution of the present invention. In order to be able to understand the technical means of the present invention more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the drawings and embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic assembly structure diagram of the valve leakage on-line observation device and the valve body;

[0021] Figure 2 It is a schematic structure diagram of the valve leakage on-line observation device;

[0022] Figure 3 It is a schematic structure diagram of the protective component;

[0023] The numbers and corresponding names in the figure are: 1. valve body, 1a. connector, 2. connecting flange, 3. inner pressure ring, 3a. ring plate, 4. window, 5. bolt, 6. sealing gasket, 7. outer winding gasket, 8. inner winding gasket, 9. outer pressure ring, 10. trapezoidal outer sealing ring, 11. rectangular graphite packing, 12. trapezoidal inner sealing ring, 13. pressure roller, 14. protective plate, 15. elastic layer, 15a. groove, 16. bottom plate, 17. handle, 18. wiping cloth, 19. pressure relief channel, 20. pressure relief valve. DETAILED DESCRIPTION

[0024] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0025] See also Figure 1 The present invention provides an online valve leakage observation device, comprising a valve body 1 and a valve gate assembly arranged in the valve body 1, wherein connectors 1a are arranged at both ends of the valve body 1, and a connecting flange 2 is arranged at one end, the connector 1a and the connecting flange 2 are connected and fixed by bolts 5, an inner pressure ring 3 is sleeved inside the connecting flange 2, the inner pressure ring 3 is tightly fitted with the valve body 1, and a sealing window 4 is arranged in the inner pressure ring 3.

[0026] When the valve leakage online observation device of this embodiment is used, the window 4 is sealed and installed into the inner ring of the inner pressure ring 3, and the inner pressure ring 3 is installed into the inner ring of the connecting flange 2. The connecting body 1a at one end of the valve body 1 is connected to the pipeline, and the connecting body 1a at the other end is aligned with the connecting flange 2, and is fixed by bolts 5 to ensure that the end face of the inner pressure ring 3 is sealed tightly against the end face of the connecting body 1a. The closed valve gate assembly (i.e., the valve stem drives the gate plate and the valve seat seal) isolates the middle cavity of the valve body 1, and at the same time, the pipeline inputs fluid into the medium flow channel of the valve body 1. The inspection personnel can observe whether the valve body 1 has internal leakage through the window 4. If there is no leakage in the valve body 1, the valve is judged to be a good product; if the valve body 1 has an internal leakage problem, it is blocked by the above device to prevent the fluid from being exposed and affecting the test environment. For this reason, requirements are put forward for the assembly sealing between the various components of the device. The specific sealing structure of each part is as follows:

[0027] See also Figure 2 One end of the inner pressure ring 3 radially extends inward and outward of the ring to form a ring plate portion 3a. One side of the ring plate portion 3a is in close contact with the end face of the connecting flange 2, and a sealing gasket 6 is arranged between the other side and the end face of the connecting body 1a.

[0028] In this structure, a gasket 6 is used to seal between the internal pressure ring 3 and the connecting body 1a. Since the internal pressure ring 3 is a thin-walled component, if the gasket 6 is directly installed on its end face, there will be problems such as unstable installation of the gasket 6 and uneven stress-induced deformation. In this embodiment, one end of the internal pressure ring 3 facing the connecting body 1a extends radially to form an annular structure, increasing the installation area of the gasket 6, and the connecting flange 2 applies pressure to the gasket 6 more evenly through the ring plate portion 3a to ensure the sealing performance between the internal pressure ring 3 and the connecting body 1a.

[0029] Among them, the gasket 6 is made of an elastic material, such as a rubber material. Both sides of the gasket 6 are in a serrated structure. After the gasket 6 of this structure is squeezed, multiple sealing circles can be respectively formed on the contact surfaces with the connecting body 1a and the ring plate portion 3a on both sides, further improving the reliability of the seal.

[0030] The viewing window 4 is made of transparent plastic. An outer winding gasket 7 is provided between one side of the viewing window 4 and the connecting flange 2, and an inner winding gasket 8 is provided between the other side and the ring plate portion 3a.

[0031] The viewing window 4 made of transparent plastic in this embodiment has a lower cost and better toughness compared to glass, and is not easily broken due to stress effects. For example, the viewing window 4 made of materials such as polymethyl methacrylate and polycarbonate still has good optical properties while meeting the above performance requirements. The viewing window 4 is installed in the annular cavity formed by the connecting flange 2 and the internal pressure ring 3. The outside of the viewing window 4 is sealed with the connecting flange 2 using the outer winding gasket 7, and the inside of the viewing window 4 is sealed with the ring plate portion 3a using the inner winding gasket 8. At the same time, the inner winding gasket 8 and the outer winding gasket 7 also play a protective role to prevent damage to the viewing window 4 when the connecting flange 2 and the internal pressure ring 3 are clamped and fixed.

[0032] A packing groove is provided between the entire circumference of the viewing window 4 and the inner circle of the internal pressure ring 3, and a sealing component is provided in the packing groove. The sealing component is composed of an outer pressure ring 9, a trapezoidal outer sealing ring 10, a rectangular graphite packing 11, and a trapezoidal inner sealing ring 12 arranged closely in sequence.

[0033] This sealing component can be independent or cooperate with the above-mentioned outer winding gasket 7 to achieve the seal between the internal pressure ring 3 and the viewing window 4. The trapezoidal outer sealing ring 10 and the trapezoidal inner sealing ring generally use low-temperature-resistant rubber sealing rings to suit the sealing under low-temperature and normal-temperature working conditions. The rectangular graphite packing 11 is used for sealing under high-temperature working conditions. The outer pressure ring 9 presses each sealing ring tightly to prevent loosening, ensuring the reliability of the seal around the entire circumference between the internal pressure ring 3 and the viewing window 4.

[0034] Furthermore, a plurality of pressing shafts 13 are threaded through the connecting flange 2. The length direction of the pressing shafts 13 is consistent with the axis direction of the connecting flange 2, and one end of the pressing shafts 13 abuts against the outer pressure ring 9.

[0035] Considering assembly reasons or wear during long-term use, the sealing performance of the sealing component may decline, which may occur in actual situations. Therefore, in this embodiment, a circle of threaded holes is drilled on the end face of the connecting flange 2, and a pressing shaft 13 with an external thread is installed in the threaded holes. By turning the pressing shaft 13 with a tool, the outer pressure ring 9 can be pushed to move towards the connecting body 1a. Due to the trapezoidal hypotenuse design of the trapezoidal outer sealing ring 10 and the trapezoidal inner sealing ring 12, when subjected to external force extrusion, their deformation contact area is larger and the sealing performance is better. Re-sealing is achieved through extrusion deformation, extending the service life and sealing effect.

[0036] Please refer to Figure 3 , protective components are provided on both sides of the viewing window 4. The protective components include a protective plate 14, an elastic layer 15, and a bottom plate 16 connected in sequence. A groove 15a is formed on the side of the protective plate 14 away from the elastic layer 15, and a handle 17 that can be turned outwards is provided in the groove 15a. A wiping cloth 18 is provided at one end of the bottom plate 16 away from the elastic layer 15, and the wiping cloth 18 is closely attached to the viewing window 4.

[0037] Since both ends of the viewing window 4 of this device are transparent, it is inevitable that dust adheres or foreign objects scratch or slide during transportation or suspension of use, which will affect the use of the viewing window 4. Therefore, in this embodiment, protective components are installed at both ends of the viewing window 4. The inner ring of the connecting flange 2 or the inner ring of the inner pressure ring 3 is blocked by the protective plate 14. The protective plate 14 is supported by a hard material such as a wooden board or a metal plate, and its size, thickness, etc. are determined according to the connecting flange 2 or the inner pressure ring 3. When subjected to external impact, it cooperates with the elastic layer 15 composed of multiple springs evenly distributed along the circumferential direction of the inner ring of the connecting flange 2 to buffer and absorb the external force, and can play a better protective role. In addition, the wiping cloth 18 on the bottom plate 16 covers the surface of the viewing window 4, which can not only provide flexible protection but also be used for cleaning the surface of the viewing window 4. Specifically, when in use, the handle 17 in the groove 15a is flipped out and taken out, and the protective plate 14 is lifted and rotated circumferentially or moved forward and backward through the handle 17, so as to drive the wiping cloth 18 to clean the viewing window 4. After cleaning, the handle 17 is rotated into the groove 15a for storage.

[0038] Please refer to Figure 1-2 , a pressure relief flow channel 19 is provided in the ring plate portion 3a. One end of the pressure relief flow channel 19 communicates with the medium flow channel of the valve body 1, and the other end is connected with a pressure relief valve 20. The pressure relief valve 20 is located between the connecting flange 2 and the connecting body 1a.

[0039] To avoid potential safety hazards to personnel caused by operational mistakes or non-standard operations (for example, when the valve gate assembly is in the open state, if a person's eyes are in the observation position at this time and the fluid pressure in the pipeline is too high, it may cause the viewing window 4 to shatter and rush towards the monitoring personnel with the fluid, causing injuries). In this embodiment, a pressure relief flow channel 19 is opened and connected to a pressure relief valve 20. The opening pressure of the pressure relief valve 20 is set to be lower than the maximum pressure that the viewing window 4 can withstand. Even if there are problems with the operation, the fluid in the valve body 1 can be depressurized through the pressure relief flow channel 19 from the pressure relief valve 20, avoiding damage to the device caused by abnormal high pressure in the valve and ensuring the safety and reliability of the valve internal leakage monitoring.

[0040] In summary, when performing valve leakage detection, there is no need to use professional equipment, and the professional ability requirements for monitoring personnel are relatively low. It is suitable for efficient and low-cost leak detection operations at specific workstations of pipelines; it can relieve abnormal pressure in the valve body 1, avoid damage to personnel caused by the breakage of weak parts of the device, and improve the safety and reliability of valve internal leakage monitoring.

[0041] The present invention is not limited to the above specific embodiments. For those of ordinary skill in the art, starting from the above concepts, all kinds of transformations made without creative labor fall within the protection scope of the present invention.

Claims

1. An on-line valve leakage observation device, comprising a valve body (1) and a valve gate assembly arranged inside the valve body (1). Characterized in that, One end of the valve body (1) is provided with a connecting flange (2), an internal pressure ring (3) is sleeved inside the connecting flange (2), the internal pressure ring (3) is in close fit with the valve body (1), and a window (4) is sealed and installed in the internal pressure ring (3); One end of the internal pressure ring (3) radially extends towards the inside and outside of the ring to form a ring plate part (3a). A sealing gasket (6) is arranged between one side of the ring plate part (3a) and the end face of the connecting flange (2) and the other side and the end face of the connecting body (1a); A pressure relief flow channel (19) is arranged inside the ring plate part (3a). One end of the pressure relief flow channel (19) communicates with the medium flow channel of the valve body (1), and the other end is connected with a pressure relief valve (20). The pressure relief valve (20) is located between the connecting flange (2) and the connecting body (1a); The opening pressure of the pressure relief valve (20) is set lower than the maximum pressure that the window (4) can withstand.

2. The on-line valve leakage observation device according to claim 1, Characterized in that, Connecting bodies (1a) are arranged at both ends of the valve body (1), and the connecting bodies (1a) and the connecting flange (2) are fixed by being connected with bolts (5).

3. The on-line valve leakage observation device according to claim 1, Characterized in that, The sealing gasket (6) is made of an elastic material, and both sides of the sealing gasket (6) are in a serrated structure.

4. The on-line valve leakage observation device according to claim 1, Characterized in that, The window (4) is made of transparent plastic. An external winding gasket (7) is arranged between one side of the window (4) and the connecting flange (2), and an internal winding gasket (8) is arranged between the other side and the ring plate part (3a).

5. The on-line valve leakage observation device according to claim 4, Characterized in that, A packing groove is arranged between the whole body of the window (4) and the inner circle of the internal pressure ring (3), and a sealing component is arranged in the packing groove. The sealing component is composed of an external pressure ring (9), a trapezoidal external sealing ring (10), a rectangular graphite packing (11) and a trapezoidal internal sealing ring (12) which are arranged closely in sequence.

6. The on-line valve leakage observation device according to claim 5, Characterized in that, A plurality of pressing shafts (13) are threaded through the connecting flange (2). The length direction of the pressing shafts (13) is consistent with the axis direction of the connecting flange (2), and one end of the pressing shafts (13) abuts against the external pressure ring (9).

7. The on-line valve leakage observation device according to claim 1, Characterized in that, Protection components are arranged on both sides of the window (4). The protection components include a protection plate (14), an elastic layer (15) and a bottom plate (16) which are connected in sequence. A groove (15a) is formed on one side of the protection plate (14) away from the elastic layer (15), and a handle (17) that can be turned outwards is arranged in the groove (15a). A wiping cloth (18) is arranged at one end of the bottom plate (16) away from the elastic layer (15), and the wiping cloth (18) is close to the window (4).

8. The on-line valve leakage observation device according to claim 7, characterized in that, the protection plate (14) is made of a hard material, and the elastic layer (15) is composed of a plurality of springs evenly distributed circumferentially along the inner circle of the connecting flange (2).

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