Sealing assembly for high-pressure liquefied natural gas pipeline valve

Abstract

The sealing assembly comprises a valve body and a pipeline, the pipeline is arranged at the right end of the valve body, connecting plates are arranged at the opposite face ends of the pipeline and the valve body, and the two connecting plates are fixedly connected through a plurality of bolts. Sleeve shells are arranged on the outer wall of the connecting position of the pipeline and the valve body in a clamped mode, the upper ends of the two sleeve shells are fixedly connected through hinges, a plurality of copper sheets are arranged at the front ends and the rear ends of the inner walls of the two sleeve shells in a pasted mode, and the copper sheets make contact with natural gas to generate chemical reaction and become green. The copper sheet pasted in the sleeve shell can generate chemical reaction when making contact with natural gas, so that a layer of green copper oxide is generated on the surface of the copper sheet, whether the gas leakage phenomenon exists at the joint of the valve body and the pipeline or not is judged by observing the color of the copper sheet in the sleeve shell, the joint can be overhauled more conveniently through visual observation, and the maintenance efficiency is improved. Whether air leakage occurs or not can be checked at any time to prevent and prejudge dangers.

Description

TECHNICAL FIELD

[0001] The utility model belongs to natural gas pipeline valve related technical field, specifically related to a kind of sealing assembly for high-pressure liquefied natural gas pipeline valve. BACKGROUND

[0002] Natural gas pipeline safety valve is a kind of safety device used in natural gas pipeline system, for protecting pipeline system from overpressure or overpressure danger. The main role of safety valve is to release pressure in time when abnormal pressure occurs in pipeline system, to ensure the safe operation of pipeline system and equipment, but the sealing ring between safety valve and pipeline will be aged under long-time use, leading to leakage at connecting portion, and natural gas is not easy to be detected, thus leading to leakage at valve connecting portion not easy to be detected, causing danger. SUMMARY

[0003] The utility model discloses a kind of sealing assembly for high-pressure liquefied natural gas pipeline valve, to solve the problem that the sealing ring between safety valve and pipeline will be aged under long-time use in above background technology, leading to leakage at connecting portion, and natural gas is not easy to be detected, thus leading to leakage at valve connecting portion not easy to be detected, causing danger.

[0004] To achieve the above object, the utility model provides the following technical scheme: a kind of sealing assembly for high-pressure liquefied natural gas pipeline valve, including valve body and pipeline;

[0005] The valve body right end is provided with pipeline, the pipeline and the opposite end of valve body are provided with connecting plate, two The connecting plate is fixedly connected by a plurality of bolts, the outer wall of the pipeline and the valve body connecting portion is clamped with shell;

[0006] Two The shell upper end is connected and fixed by hinge, two The inner wall of shell is pasted with a plurality of copper sheets at front and back ends, a plurality of The copper sheet and natural gas contact will produce chemical reaction and become green.

[0007] Preferably, two The shell lower end is provided with fixed strip, two The shell is fixed by two screws Two fixed strips are clamped and fixed on the outer wall of pipeline and valve body.

[0008] Preferably, two shell and pipeline and valve body outer wall are provided with rubber pad, the rubber pad is used to increase the sealing between shell and pipeline and valve body, two The shell is made of transparent plastic.

[0009] Preferably, the upper end of the valve body is provided with a valve cover, the upper end of the valve cover is provided with a valve cap, the valve cover and the valve cap are connected by lead sealing line to prevent theft.

[0010] Preferably, the lower end of the valve body inner wall is provided with a valve seat, the upper end of the valve seat is provided with a backflushing disc, and the lower end of the backflushing disc is provided with a valve flap.

[0011] Preferably, the inner wall between the valve body and the valve cover is provided with a guide sleeve, the upper end of the valve cover is embedded with an adjusting screw, the guide sleeve and the adjusting screw are internally connected with a valve rod, and the valve rod is used to press down the backflushing disc.

[0012] Preferably, the upper end of the guide sleeve is provided with a spring outside the valve rod, the spring is used to apply a downward pressure to the valve rod, and the left end of the valve body is connected with an adjusting ring.

[0013] Compared with the prior art, the utility model provides a sealing assembly for high-pressure liquefied natural gas pipeline valve, has the following beneficial effects:

[0014] Two sleeve shells are opened through hinges, clamped and fixed on the outer wall of the valve body and the pipeline connection, the connecting plate is wrapped, and the two sleeve shells are fixed through the screw screwed into the fixed strip at the lower end of the sleeve shell, and the rubber pad at the connecting edge of the sleeve shell can increase the sealing property, when the pipeline and the valve body connection occur leakage phenomenon, the gas can be stored in the sleeve shell, and the copper sheet pasted in the sleeve shell will produce a chemical reaction when contacting with the natural gas, thereby causing a layer of green copper oxide on the surface of the copper sheet, the color of the copper sheet in the sleeve shell is observed to distinguish whether the valve body and the pipeline connection have leakage phenomenon, and the connection can be conveniently overhauled through visual observation, and the leakage phenomenon can be checked at any time to prevent and predict danger. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a sealing assembly structure schematic view for the utility model of a high-pressure liquefied natural gas pipeline valve.

[0016] Figure 2 It is a sealing assembly sleeve shell disassembly structure schematic view for the utility model of a high-pressure liquefied natural gas pipeline valve.

[0017] Figure 3 It is a front end planing structure schematic view for the utility model of a high-pressure liquefied natural gas pipeline valve.

[0018] Figure 4 It is a sleeve shell fixing structure schematic view for the utility model.

[0019] Figure 5 It is a right end planing structure schematic view for the utility model of a sleeve shell.

[0020] In the figure: 1, valve body; 2, adjusting ring; 3, sealing lead line; 4, valve cap; 5, valve cover; 6, pipeline; 7, connecting plate; 8, bolt; 9, sleeve; 10, valve seat; 11, valve flap; 12, backflush disc; 13, spring; 14, adjusting screw; 15, valve stem; 16, guide sleeve; 17, fixing strip; 18, screw; 19, copper sheet; 20, hinge; 21, rubber pad. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0022] The utility model provides a kind of sealing assembly for high-pressure liquefied natural gas pipeline valve as Figures 1-5 As shown in the figure, it includes valve body 1 and pipeline 6;

[0023] Valve body 1 right end is provided with pipeline 6, and pipeline 6 is provided with connecting plate 7 at opposite end of valve body 1, and two connecting plates 7 are fixedly connected by a plurality of bolts 8, and the outer wall of the connection between pipeline 6 and valve body 1 is clamped with sleeve 9;

[0024] Two sleeves 9 upper ends are connected and fixed by hinge 20, and the inner wall of two sleeves 9 is pasted with a plurality of copper sheets 19 at front and back ends, and a plurality of copper sheets 19 will react chemically and become green when contacting with natural gas.

[0025] Two sleeves 9 are opened by hinge 20, and are clamped and fixed on the outer wall of the connection between valve body 1 and pipeline 6, and connecting plate 7 is wrapped, when gas leakage occurs at the connection between valve body 1 and pipeline 6, natural gas will react chemically when contacting with copper sheet 19, so that copper sheet 19 becomes green, and whether the connection leaks gas can be checked by observing the color of copper sheet 19.

[0026] As shown in the figure, two sleeves 9 lower ends are provided with fixing strips 17, and two sleeves 9 are fixed by two screws 18 to clamp and fix the outer wall of pipeline 6 and valve body 1, and rubber pad 21 is arranged between two sleeves 9 and the outer wall of pipeline 6 and valve body 1, rubber pad 21 is used to increase the sealing property between sleeve 9 and pipeline 6 and valve body 1, and two sleeves 9 are made of transparent plastic. Figure 4 Figure 5 As shown in the figure, two sleeves 9 lower ends are provided with fixing strips 17, and two sleeves 9 are fixed by two screws 18 to clamp and fix the outer wall of pipeline 6 and valve body 1, and rubber pad 21 is arranged between two sleeves 9 and the outer wall of pipeline 6 and valve body 1, rubber pad 21 is used to increase the sealing property between sleeve 9 and pipeline 6 and valve body 1, and two sleeves 9 are made of transparent plastic.

[0027] ​The two sleeve shells 9 are fixed by clamping and fixing the sleeve shells 9 on the outer wall of the connection part of the valve body 1 and the pipeline 6, and the rubber pad 21 is used to increase the sealing performance of the connection between the sleeve shells 9 and the valve body 1 and the pipeline 6.

[0028] As shown in Figure 1 and Figure 2 , the valve body 1 is provided with a valve cover 5 at the upper end, the valve cover 5 is provided with a valve cap 4 at the upper end, and the valve cover 5 and the valve cap 4 are connected by a sealing lead line 3 to prevent theft. The valve cap 4 is clamped and fixed on the upper end of the valve cover 5, and the sealing lead line 3 can prevent the valve cap 4 from falling and being lost.

[0029] As shown in Figure 1 and Figure 3 , the valve body 1 is provided with a valve seat 10 at the lower end of the inner wall, the valve seat 10 is provided with a backflushing disc 12 at the upper end, the backflushing disc 12 is provided with a valve flap 11 at the lower end, the backflushing disc 12 is used to press down and cover the valve seat 10, the valve body 1 and the valve cover 5 are provided with a guide sleeve 16 between the inner walls, the valve cover 5 is provided with an adjusting screw 14 embedded at the upper end, the guide sleeve 16 and the adjusting screw 14 are provided with a valve rod 15 inserted and connected, the valve rod 15 is used to press down the backflushing disc 12, the guide sleeve 16 is provided with a spring 13 at the upper end of the valve rod 15, the spring 13 is used to apply a downward pressure to the valve rod 15, and the valve body 1 is provided with an adjusting ring 2 inserted at the left end.

[0030] After the valve seat 10 is connected with the natural gas pipe, the spring 13 will apply tension to the valve rod 15 to press the backflushing disc 12 downward to prevent natural gas from flowing upward, and when the pressure of the natural gas in the valve seat 10 is too large, the backflushing disc 12 will be lifted to release pressure and be transported outward through the pipeline 6.

[0031] The utility model works as follows: after the valve seat 10 is connected with the natural gas pipe, the spring 13 will apply tension to the valve rod 15 to press the backflushing disc 12 downward to prevent natural gas from flowing upward, and when the pressure of the natural gas in the valve seat 10 is too large, the backflushing disc 12 will be lifted to release pressure and be transported outward through the pipeline 6. The two sleeve shells 9 are opened by the hinge 20, clamped and fixed on the outer wall of the connection part of the valve body 1 and the pipeline 6, and the connecting plate 7 is wrapped. When the connection part of the valve body 1 and the pipeline 6 leaks, the natural gas will react with the copper sheet 19 to make the copper sheet 19 green, and the color of the copper sheet 19 can be observed to check whether the connection part leaks.

[0032] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and is not intended to limit the present application, although the foregoing embodiments of the present application has been described in detail, for the skilled in the art, it still can be modified, or for part of the technical features of the equivalent replacement, the spirit and principles of the present application, made any modification, equivalent replacement, improvement, etc., should be included within the scope of the present application.

Claims

1. A sealing assembly for high-pressure liquefied natural gas pipeline valve, comprising a valve body (1) and a pipeline (6); The right end of the valve body (1) is provided with a pipeline (6), and the opposite end of the valve body (1) is provided with a connecting plate (7); the two connecting plates (7) are fixedly connected by a plurality of bolts (8); the outer wall of the connection between the pipeline (6) and the valve body (1) is clamped with a sleeve (9); characterized in that The upper ends of the two sleeves (9) are connected and fixed by a hinge (20), and the inner walls of the two sleeves (9) are pasted with a plurality of copper sheets (19) at the front and rear ends; the copper sheets (19) will react with natural gas to become green.

2. A seal assembly for a high pressure LNG pipeline valve according to claim 1, characterized in that: The lower end of each sleeve (9) is provided with a fixed strip (17), and the two sleeves (9) are fixed by two screws (18) to clamp and fix the outer wall of the pipeline (6) and the valve body (1).

3. A seal assembly for a high pressure LNG pipeline valve according to claim 2, wherein: Rubber pads (21) are arranged between the two sleeves (9) and the outer walls of the pipeline (6) and the valve body (1), which are used to increase the sealing between the sleeves (9) and the pipeline (6) and the valve body (1), and the two sleeves (9) are made of transparent plastic.

4. A seal assembly for a high pressure LNG pipeline valve according to claim 1, characterized in that: The upper end of the valve body (1) is provided with a valve cover (5), and the upper end of the valve cover (5) is provided with a valve cap (4); the valve cover (5) and the valve cap (4) are connected by a lead seal (3) to prevent theft.

5. A seal assembly for a high pressure LNG pipeline valve according to claim 4, wherein: The lower end of the inner wall of the valve body (1) is provided with a valve seat (10), the upper end of the valve seat (10) is provided with a backflush disc (12), the lower end of the backflush disc (12) is provided with a valve disc (11), and the backflush disc (12) is used to press down the valve seat (10).

6. A seal assembly for a high pressure LNG pipeline valve according to claim 5, wherein: The inner wall between the valve body (1) and the valve cover (5) is provided with a guide sleeve (16), the upper end of the valve cover (5) is embedded with an adjusting screw (14), and the guide sleeve (16) and the adjusting screw (14) are inserted with a valve rod (15), which is used to press down the backflush disc (12).

7. A seal assembly for a high pressure LNG pipeline valve according to claim 6, wherein: The outer wall of the valve rod (15) at the upper end of the guide sleeve (16) is provided with a spring (13), which is used to apply downward pressure to the valve rod (15); and the left end of the valve body (1) is inserted with an adjusting ring (2).

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