Sealing device for hydraulic test of valve rod assembly

Abstract

The invention belongs to the technical field of valve tests, and particularly relates to a valve rod assembly hydrostatic test sealing device. The sealing device for the hydraulic test of the valve rod assembly comprises a pressing pipe, the pressing pipe is a hollow barrel-shaped part, a test connector preformed hole is formed in the side wall of the pressing pipe, a valve rod assembly preformed hole is formed in one end of the pressing pipe, and a fastening sealing device is arranged outside the pressing pipe. The invention has the following technical characteristics: 1, the positioning is reliable, and the valve rod assembly is effectively prevented from moving up and down; the hollow design structure is adopted, the space is large, the utilization rate is high, and installation of valve rod assemblies of various specifications can be met; and 3, a threaded pressing mechanism can further compress the O-shaped ring by increasing the clamping force, so that the overall sealing performance of the device is improved. 4, the operation is simple, the flexibility is high, and the requirements of different working conditions are met; the main body structure is fixed through argon arc welding, stability and firmness are achieved, safety is high, and sealing performance is good.

Description

Technical Field

[0001] The invention belongs to the technical field of valve testing, and in particular relates to a valve stem assembly water pressure test sealing device. Background Art

[0002] In industrial process systems, valve safety is of vital importance, especially under special working conditions such as high temperature and high pressure, where valve leakage or backflow may cause serious safety accidents. Therefore, testing the sealing performance of the valve can ensure its safety under actual working conditions. As the key opening and closing part for controlling the on and off of the valve, the sealing performance of the valve stem assembly will directly affect the overall sealing performance of the valve. Therefore, in order to ensure the overall sealing of the valve, it is necessary to test the sealing of the valve stem assembly. Limited by the sealing test requirements of the valve stem assembly and the structure of the valve stem assembly, the traditional valve stem assembly sealing test device lacks certain applicability. Therefore, how to meet the sealing test requirements of the valve stem assembly while also making the device have a certain applicability is a technical problem that needs to be solved urgently. Summary of the invention

[0003] The present invention provides a valve stem assembly water pressure test sealing device according to the valve stem assembly sealing test requirements.

[0004] The present invention is implemented as follows: a valve stem assembly water pressure test sealing device, which includes a clamping tube, which is a hollow barrel-shaped part, a test joint reserved hole is provided on the side wall of the clamping tube, a valve stem assembly reserved hole is provided at one end of the clamping tube, and a fastening sealing device is provided outside the clamping tube.

[0005] A valve stem assembly water pressure test sealing device as described above, wherein the fastening sealing device includes a connecting plate and a tensioning plate respectively arranged at both ends of the compression tube, and a fully threaded stud arranged parallel to the compression tube for connecting the tensioning plate and the connecting plate.

[0006] In the valve stem assembly water pressure test sealing device as described above, four full-thread studs are provided and evenly distributed around the compression tube.

[0007] In the valve stem assembly water pressure test sealing device as described above, a test joint is arranged in the test joint reserved hole of the compression tube, and the compression tube is connected to the test joint by welding.

[0008] As described above, a valve stem assembly water pressure test sealing device, wherein a groove matching the shape of the end of the compression tube is provided on the connecting plate, and the connecting plate is welded to the compression tube.

[0009] A valve stem assembly water pressure test sealing device as described above, wherein the full-thread stud is fastened by a nut assembly, and the compression tube is fastened by a connecting plate and a tensioning plate, and the nut assembly includes a nut and a gasket.

[0010] In the valve stem assembly water pressure test sealing device as described above, a groove is arranged on the valve stem assembly reserved hole of the compression tube, an O-ring is arranged in the groove, and the O-ring is used to increase the seal between the valve stem assembly and the compression tube.

[0011] In the valve stem assembly water pressure test sealing device as described above, the connecting plate and the clamping pipe are connected by argon arc welding.

[0012] In the valve stem assembly water pressure test sealing device as described above, a through hole with a threaded hole is provided in the middle of the connecting plate for connecting to a drain pipe.

[0013] The present invention has the following technical features:

[0014] 1. Reliable positioning, effectively preventing the valve stem assembly from moving up and down;

[0015] 2. The hollow design structure has large space and high utilization rate, which can meet the installation of valve stem components of various specifications.

[0016] 3. The threaded clamping mechanism can further compress the O-ring and improve the overall sealing of the device by increasing the clamping force.

[0017] 4. Simple operation and strong flexibility to meet the needs of different working conditions;

[0018] 5. The main structure is fixed by argon arc welding, which is stable and firm, highly safe and has good sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a full cross-sectional view of a valve stem assembly water pressure test sealing device provided by the present invention;

[0020] Figure 2 It is a cross-sectional view of a test joint of a valve stem assembly water pressure test sealing device provided by the present invention;

[0021] Figure 3 This is a front view of a valve stem assembly water pressure test sealing device provided by the present invention;

[0022] Figure 4 It is a left side view of a valve stem assembly water pressure test sealing device provided by the present invention;

[0023] Figure 5 It is a top view of a valve stem assembly water pressure test sealing device provided by the present invention;

[0024] Figure 6 It is a three-dimensional isometric view of a valve stem assembly water pressure test sealing device provided by the present invention.

[0025] Among them, 1. nut; 2. gasket; 3. connecting plate; 4. compression tube; 5. test joint; 6. full-thread stud; 7. O-ring; 8. tension plate. DETAILED DESCRIPTION

[0026] The present invention provides a valve stem assembly water pressure test sealing device, comprising a nut 1, a gasket 2, a connecting plate 3, a clamping tube 4, a test joint 5, a fully threaded stud 6, an O-ring 7, and a tensioning plate 8. The clamping tube 4 is inserted into the groove of the connecting plate 3 and fixed and sealed by welding; the test joint 5 and the clamping tube 4 are connected by threads and fixed and sealed by welding; the connecting plate 3, the clamping tube 4 and the test joint 5 together constitute a test welding pipe component; the test welding pipe component and the tensioning plate 8 are connected in series through four fully threaded studs 6; after the assembly of the valve stem assembly is completed, the test welding pipe component and the tensioning plate 8 are tightened to each other through the nuts 1 and the gaskets 2 on both sides.

[0027] Among them, the tensioning structure adopts a four-stud evenly distributed design, and the studs and nuts are matched to solve the locking problem of the valve stem assembly at any position during the test; an O-ring is added at the connection between the valve stem assembly and the compression tube to solve the sealing problem between the valve stem assembly and the compression tube; the tensioning plate and the connecting plate are connected by the matching of full-threaded studs and nuts to solve the fixing problem of the valve stem assembly. In addition, this structure can further improve the test sealing of the device by increasing the tightening torque.

[0028] The connecting plate 3 and the tensioning plate 8 are connected and fixed by means of a nut 1, a gasket 2 and a fully threaded stud 6 to compress the valve stem assembly to ensure its sealing.

[0029] The connection plate 3 and the compression pipe 4 are connected by argon arc welding, which is firm and reliable;

[0030] The connecting plate 3 has a through hole with a threaded hole in the middle for connecting with the drain pipe. In addition, four through holes are evenly distributed on the surface for inserting the full-threaded studs 6.

[0031] The compression tube 4 adopts a hollow design, which can meet the installation space requirements of different valve stem assemblies.

[0032] The middle part of the compression tube 4 is designed with a threaded hole structure for screwing into the test joint 5 , and the end surface is designed with a groove structure for placing the O-ring 7 .

[0033] One end of the test joint 5 is an external thread structure connected to the compression pipe 4, and the middle part is a threaded through hole structure for connecting the water inlet pipe.

[0034] The tensioning plate 8 has a through hole in the middle for inserting the valve stem assembly. In addition, the tensioning plate 8 has four through holes evenly distributed on its surface, which correspond to the four through holes of the connecting plate 3 for inserting the full-threaded studs 6 .

[0035] The specific working process of the present invention is as follows:

[0036] 1. First, place the compression tube 4 vertically, and then screw the test joint 5 into the threaded hole of the compression tube 4. Be careful not to screw it in too deep to avoid affecting the placement of the valve stem assembly. Screw it to the inner wall of the compression tube 4, and weld it to the appropriate position.

[0037] 2. Place the welded compression tube 4 into the groove of the connecting plate 3 and fix and seal it by welding.

[0038] 3. Pass four fully threaded studs 6 through the reserved holes of the connecting plate 3 respectively and insert the gasket 2 and screw in the nut 1.

[0039] 4. Place the O-ring 7 into the reserved groove of the compression tube 4, take the valve stem assembly, insert it from the top of the device, and place it on the top of the compression tube 4.

[0040] 5. Pass the tension plate 8 through the fully threaded stud 6 and place it on the valve stem assembly, then insert the gasket 2 and screw in the nut 1.

[0041] 6. Adjust the nuts 1 at both ends of the device at the same time so that the valve stem assembly is located in the middle of the device. After adjusting to the appropriate position, tighten the nuts 1 at both ends of the device toward the middle of the full-thread stud 6 at the same time until the valve stem assembly is completely compressed.

[0042] 7. During the test, connect the pressure test pipeline to the test joint 5 for pressurization, and visually observe from the top of the device whether there is water flow or water droplets overflowing, so as to determine whether there is any leakage in the valve stem assembly.

[0043] The above specific implementation modes are used to explain the present invention rather than to limit the present invention. Any modification and change made to the present invention within the spirit of the present invention and the protection scope of the claims shall fall within the protection scope of the present invention.

Claims

1. A valve stem assembly water pressure test sealing device, characterized in that: The invention comprises a compression tube (4), which is a hollow barrel-shaped part. A test joint reserved hole is provided on the side wall of the compression tube (4), a valve stem assembly reserved hole is provided at one end of the compression tube (4), and a fastening sealing device is provided outside the compression tube (4).

2. A valve stem assembly water pressure test sealing device as claimed in claim 1, characterized in that: The fastening and sealing device comprises a connecting plate (3) and a tensioning plate (8) respectively arranged at both ends of the compression tube (4), and a fully threaded stud (6) arranged parallel to the compression tube (4) and used to connect the tensioning plate (8) and the connecting plate (3).

3. A valve stem assembly water pressure test sealing device as claimed in claim 2, characterized in that: A total of four full-thread studs (6) are provided and are evenly distributed around the compression tube (4).

4. A valve stem assembly water pressure test sealing device as claimed in claim 3, characterized in that: A test joint (5) is arranged in the test joint reserved hole of the compression tube (4), and the compression tube (4) and the test joint (5) are connected by welding.

5. A valve stem assembly water pressure test sealing device as claimed in claim 4, characterized in that: The connecting plate (3) is provided with a groove matching the shape of the end of the pressing tube (4), and the connecting plate (3) and the pressing tube (4) are connected by welding.

6. A valve stem assembly water pressure test sealing device as claimed in claim 5, characterized in that: The full-thread stud (6) is fastened by a nut assembly, and the compression tube (4) is fastened by a connecting plate (3) and a tensioning plate (8). The nut assembly comprises a nut (1) and a gasket (2).

7. A valve stem assembly water pressure test sealing device as claimed in claim 6, characterized in that: A groove is arranged on the reserved hole of the valve stem assembly of the compression tube (4), and an O-ring (7) is arranged in the groove. The O-ring (7) is used to increase the sealing between the valve stem assembly and the compression tube (4).

8. A valve stem assembly water pressure test sealing device as claimed in claim 7, characterized in that: The connecting plate (3) and the pressing pipe (4) are connected by argon arc welding.

9. A valve stem assembly water pressure test sealing device as claimed in claim 8, characterized in that: A through hole with a threaded hole is arranged in the middle of the connecting plate (3) for connecting with a drainage pipe.

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