Gate valve packing structure for harsh working conditions

Abstract

The utility model discloses a gate valve packing structure for harsh working conditions, which comprises a valve cover, a valve rod, a pressing plate, a pressing sleeve, a first packing, a first backing ring, a second packing, a second backing ring and an upper sealing seat, the valve rod is movably mounted in the center of the valve cover, and the upper sealing seat, the second backing ring, the second packing, the first backing ring, the first packing and the pressing sleeve are sequentially mounted between the valve rod and the valve cover from bottom to top. The upper sealing seat is connected to the top end of the interior of the valve deck through threads, a pressing plate is installed on the top of the pressing sleeve, the pressing plate is fixedly connected to the upper end of the valve deck through a slipknot bolt and a nut and tightly pressed on the pressing sleeve, and the slipknot bolt is rotationally connected to the valve deck through a pin shaft. According to the utility model, a novel structure is adopted, a set of PTFE-V-shaped packing group is added on the basis of the existing graphite packing, the first sealing is realized by virtue of the pressure self-sealing performance of the PTFE-V-shaped packing group, and then the graphite packing is used for sealing, so that the dual-sealing effect is achieved, and the sealing structure is simple to manufacture, low in cost and high in practicability.

Description

Technical Field

[0001] The utility model relates to a gate valve packing structure, in particular to a gate valve packing structure for severe working conditions. Background Art

[0002] As environmental protection requirements become increasingly stringent, especially for valves in some toxic and harmful working conditions, there are strict leakage requirements. In most cases, valves in these working conditions require bellows seals, but bellows-sealed valves are difficult to manufacture and costly. For this reason, we propose a gate valve packing structure for harsh working conditions. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a gate valve packing structure for severe working conditions, which solves the problem that valves in toxic and harmful working conditions have strict leakage requirements. In most cases, valves in these working conditions require bellows sealing, but bellows-sealed valves are difficult to manufacture and have high costs.

[0004] In order to solve the above technical problems, the utility model provides the following technical solutions: a gate valve packing structure for severe working conditions, including a valve cover, a valve stem, a pressure plate, a pressure sleeve, packing 1, gasket 1, packing 2, gasket 2 and an upper sealing seat, the valve stem is movably installed in the center of the valve cover, and an upper sealing seat, gasket 2, packing 2, gasket 1, packing 1 and a pressure sleeve are sequentially installed between the valve stem and the valve cover from bottom to top, the upper sealing seat is connected to the top end of the valve cover by threads, a pressure plate is installed on the top of the pressure sleeve, the pressure plate is fixedly connected to the upper end of the valve cover by a live bolt and a nut, and is pressed on the pressure sleeve, and the live bolt is rotatably connected to the valve cover by a pin.

[0005] Based on the above solution, the filler 1 is a graphite filler.

[0006] Based on the above solution, the second filler is composed of multiple PTFE-V-shaped fillers.

[0007] Based on the above scheme, the valve stem is slidably matched with the upper sealing seat, gasket 2, packing 2, gasket 1, packing 1 and compression sleeve respectively, and the valve stem is slidably and sealingly matched with packing 1 and packing 2 respectively.

[0008] Compared with the prior art, the utility model has the following beneficial effects: a gate valve packing structure for severe working conditions, which adopts a new structure, adds a set of PTFE-V-shaped packing groups on the basis of the existing graphite packing, relies on the pressure self-sealing performance of the PTFE-V-shaped packing group to achieve the first sealing, and then adds the graphite packing seal to achieve the effect of double sealing, and the PTFE-V-shaped packing group can be applied to most media, thereby isolating the possibility of reaction between graphite and part of the media, achieving the performance that meets the strict low leakage requirements. The utility model has a simple and reasonable structure, good sealing performance, simple production and low cost, and strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a schematic diagram of a gate valve packing structure for severe working conditions according to the utility model;

[0010] Figure 2 For this utility model Figure 1 Schematic diagram of the local structure of the upper end;

[0011] Figure 3 For this utility model Figure 1 A partial enlarged view of point A in the middle.

[0012] The numbers in the figure are: 1-valve cover, 2-valve stem, 3-pressure plate, 4-pressure sleeve, 5-packing 1, 6-gasket 1, 7-packing 2, 8-gasket 2, 9-upper sealing seat, 10-slip bolt, 11-nut, 12-pin shaft. DETAILED DESCRIPTION

[0013] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0014] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0015] Reference Figures 1 to 3It can be seen that: a gate valve packing structure for severe working conditions includes a valve cover 1, a valve stem 2, a pressure plate 3, a pressing sleeve 4, a packing 1 5, a gasket 1 6, a packing 2 7, a gasket 2 8 and an upper sealing seat 9. The valve stem 2 is movably installed in the center of the valve cover 1. The installation structure of the valve stem 2 in the valve is an existing mature technology. An upper sealing seat 9, a gasket 2 8, a packing 2 7, a gasket 1 6, a packing 1 5 and a pressing sleeve 4 are installed between the valve stem 2 and the valve cover 1 from bottom to top. The upper sealing seat 9 is connected to the top inner side of the valve cover 1 by threads. A pressure plate 3 is installed on the top of the pressing sleeve 4. The pressure plate 3 is fixedly connected to the upper end of the valve cover 1 by a live bolt 10 and a nut 11, and is pressed on the pressing sleeve 4. The live bolt 10 is rotatably connected to the valve cover 1 by a pin 12.

[0016] The packing 1 5 is a graphite packing, which is wear-resistant and has good sealing performance; the packing 2 7 is composed of multiple PTFE-V-shaped packings, which have self-sealing performance when subjected to pressure; the valve stem 2 is slidably matched with the upper sealing seat 9, the gasket 2 8, the packing 2 7, the gasket 1 6, the packing 1 5 and the pressing sleeve 4 respectively, and the valve stem 2 is slidably sealed with the packing 1 5 and the packing 2 7 respectively. This design ensures that the valve stem 2 has good sealing performance when it is stationary or moves up and down in the valve.

[0017] Principles and advantages of the utility model: a gate valve packing structure for severe working conditions. During installation, the upper sealing seat 9 is screwed into the valve cover 1, and then the valve stem 2 is inserted into the hole of the valve cover 1, and the gasket 8, the packing 2 7, the gasket 6, and the packing 1 5 are installed into the valve cover stuffing box in sequence, and the pressing sleeve 4 and the pressing plate 3 are put in. The live bolt 10 is installed on the valve cover 1 through the pin 12, and the live bolt 10 is passed through the mounting hole of the pressing plate 3, and the nut 11 is screwed in, and the nut 11 is tightened, and the pressing plate 3 is pressed against the pressing sleeve 4 to complete the installation. On the basis of the existing graphite packing, a set of PTFE-V-shaped packing group is added, and the pressure self-sealing performance of the PTFE-V-shaped packing group is relied on to realize the first sealing, and the packing seal is added to achieve the effect of double sealing, and the PTFE-V-shaped packing group can be applied to most media, thereby isolating the possibility of reaction between graphite and part of the media, and achieving the performance that meets the strict low leakage requirements. The utility model has a simple and reasonable structure, good sealing, low manufacturing cost, and is suitable for popularization and use.

[0018] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A gate valve packing structure for severe working conditions, comprising a valve cover (1), a valve stem (2), a pressure plate (3), a compression sleeve (4), a packing 1 (5), a gasket 1 (6), a packing 2 (7), a gasket 2 (8) and an upper sealing seat (9), characterized in that: The valve stem (2) is movably mounted at the center of the valve cover (1); an upper sealing seat (9), a second gasket (8), a second packing (7), a first gasket (6), a packing (5) and a pressing sleeve (4) are mounted in sequence from bottom to top between the valve stem (2) and the valve cover (1); the upper sealing seat (9) is connected to the top of the inner part of the valve cover (1) by means of threads; a pressing plate (3) is mounted on the top of the pressing sleeve (4); the pressing plate (3) is fixedly connected to the upper end of the valve cover (1) by means of a slip bolt (10) and a nut (11), and is pressed against the pressing sleeve (4); the slip bolt (10) is rotatably connected to the valve cover (1) by means of a pin (12).

2. A gate valve packing structure for severe working conditions according to claim 1, characterized in that: The filler 1 (5) is a graphite filler.

3. A gate valve packing structure for severe working conditions according to claim 1, characterized in that: The second filler (7) is composed of a plurality of PTFE-V-shaped fillers.

4. A gate valve packing structure for severe working conditions according to claim 1, characterized in that: The valve stem (2) is slidably matched with the upper sealing seat (9), the second gasket ring (8), the second packing (7), the first gasket ring (6), the first packing (5) and the pressing sleeve (4), and the valve stem (2) is slidably and sealingly matched with the first packing (5) and the second packing (7).

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