A wire seal stop valve

Abstract

The utility model discloses a line sealing stop valve relates to the field of stop valve. This line sealing stop valve includes valve body, sealing flange and valve stem spare, and sealing flange sets up at the top of valve body, and valve stem spare penetrates sealing flange and is connected with valve body, and sealing flange includes first sealing flange, flange cover and second sealing ring, and first sealing flane top is provided with second circular slot, and second sealing ring sets up in second circular slot, and first sealing flange outside is provided with thread, and flange cover inside is provided with second thread sleeve, and first sealing flange and flange cover are connected through thread and second thread sleeve screw thread. The sealing design of valve rod connection place changes from waterproof filler to sealing ring design, and the detachable flange cover is set, and the first flange is connected through the flange cover screw thread, and the second sealing ring is fixed in the second circular slot, so that the second sealing ring is closely connected with the valve rod, and the purpose of placing leakage is achieved.

Description

Technical Field

[0001] This utility model relates to the field of gate valve technology, specifically a line-sealed gate valve. Background Technology

[0002] A gate valve, also known as a stop valve, is a type of forced-seal valve. Therefore, when the valve is closed, pressure must be applied to the valve disc to force a leak-proof seal. The gate valve's opening and closing element is a plug-shaped valve disc, with a flat or conical sealing surface. The valve disc moves linearly along the centerline of the valve seat.

[0003] After prolonged use, existing line-seal gate valves suffer from severe wear of the internal anti-leakage packing due to the continuous rotation of the valve stem. Once the packing is worn, it is difficult or even impossible to replace, leaving only the option of replacing the valve with a new one.

[0004] Wear of the anti-leakage packing can cause water leakage at the valve stem connection. Prolonged leakage can lead to valve rust, accelerate valve aging, and reduce service life. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a line-sealed shut-off valve that replaces the waterproof packing with a sealing ring design, thus solving the problem of the packing being difficult to replace after wear.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a line-sealed gate valve, comprising a valve body, a sealing flange, and a valve stem, wherein the sealing flange is disposed above the valve body, and the valve stem passes through the sealing flange and connects to the valve body, characterized in that the valve body comprises:

[0007] Valve housing, with a limiting element connected to the inner side of the valve housing;

[0008] Connecting flange;

[0009] The sealing flange includes:

[0010] A first sealing flange, the top of which is provided with a second arc groove, and the outside of which is provided with threads;

[0011] A flange cover, wherein a second threaded sleeve is provided inside the flange cover;

[0012] The second sealing ring is disposed inside the second arc groove;

[0013] The first sealing flange and the flange cover are connected by threads and a second threaded sleeve.

[0014] The valve stem includes:

[0015] Round throttle;

[0016] A valve stem, with a valve disc at its end, the valve disc being located directly below a limiting member, a spring being snapped onto the top of the valve disc, a secondary valve disc being sleeved on the top of the spring, the secondary valve disc being inserted into the inner side of the limiting member, and a bellows being sleeved on the outer side of the spring.

[0017] Preferably, the valve housing is provided with an input end and an output end at both ends, and a barrier is provided inside the valve housing. A valve hole is provided on the barrier. The valve hole is located directly below the limiting member. A plurality of connection holes are provided on the top of the connecting flange. A first arc groove is provided on the top of the connecting flange. The first arc groove is located inside the connection holes.

[0018] Preferably, the first sealing flange is further provided with a plurality of sealing holes, the sealing holes being positioned corresponding to the connection holes, and a first threaded sleeve being provided inside the first sealing flange.

[0019] Preferably, the sealing flange further includes a first sealing ring and connecting bolts. The first sealing ring is disposed in a first arc groove, and the connecting bolts are inserted into the sealing hole and the connecting hole and are fitted with nuts.

[0020] Preferably, the circular handle has an opening into which a fixing bolt is inserted. The fixing bolt passes through the opening and is connected to the top of the valve stem. The top of the valve stem has a fixing hole into which a fixing bolt is threaded. The middle part of the valve stem is provided as a screw.

[0021] Preferably, the screw thread is connected to the first threaded sleeve, the valve disc is positioned corresponding to the valve hole, and the upper part of the valve stem is tightly fitted with the second sealing ring.

[0022] Its beneficial effects are as follows:

[0023] The sealing design at the valve stem connection is changed from waterproof packing to a sealing ring design. A detachable flange cover is installed. The second sealing ring is fixed in the second arc groove by connecting the first flange with the flange cover threadedly, so that the second sealing ring fits tightly against the valve stem to prevent leakage.

[0024] When the valve is opened, the valve disc moves upward under the action of the valve stem, and the secondary valve disc fits against the limiting element under the action of the spring, improving the sealing effect from multiple directions. At this time, disassembling the flange cover to replace the second sealing ring will not affect normal use. Attached Figure Description

[0025] 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.

[0026] Figure 1 This is a schematic diagram of the structure of this utility model;

[0027] Figure 2 This is a schematic diagram of the valve housing of this utility model;

[0028] Figure 3 This is a cross-sectional structural diagram of the valve housing of this utility model;

[0029] Figure 4 This is a schematic diagram of the sealing flange of this utility model;

[0030] Figure 5 This is a cross-sectional structural diagram of the sealing flange of this utility model;

[0031] Figure 6 This is a schematic diagram of the valve stem component of this utility model;

[0032] Figure 7 This is a cross-sectional structural diagram of the valve stem of this utility model.

[0033] In the diagram: 1. Valve body; 11. Valve shell; 111. Input end; 112. Output end; 113. Barrier; 114. Valve hole; 12. Connecting flange; 121. Connecting hole; 122. First arc groove; 13. Limiting element; 2. Sealing flange; 21. First sealing flange; 211. Sealing hole; 212. First threaded sleeve; 213. Thread; 214. Second arc groove; 22. Flange cover; 221. Second threaded sleeve; 23. First sealing ring; 24. Second sealing ring; 25. Connecting bolt; 251. Nut; 3. Valve stem; 31. Circular handle; 311. Opening; 32. Fixing bolt; 33. Valve stem; 331. Fixing hole; 332. Thread; 333. Valve disc; 334. Spring; 335. Secondary valve disc; 336. Bellows. Detailed Implementation

[0034] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0035] This utility model discloses a line-sealed shut-off valve.

[0036] According to the appendix Figures 1-3 As shown, a line-sealed gate valve includes a valve body 1, a sealing flange 2, and a valve stem 3. The sealing flange 2 is disposed above the valve body 1, and the valve stem 3 passes through the sealing flange 2 and connects to the valve body 1. The valve body 1 includes:

[0037] Valve housing 11, with a limiting element 13 connected to the inner side of the valve housing 11;

[0038] Connecting flange 12;

[0039] The sealing flange 2 includes:

[0040] The first sealing flange 21 has a second arc groove 214 on its top and a thread 213 on its outer side.

[0041] Flange cover 22, wherein a second threaded sleeve 221 is provided inside the flange cover 22;

[0042] The second sealing ring 24 is disposed inside the second arc groove 214;

[0043] The first sealing flange 21 and the flange cover 22 are connected by threads 213 and the second threaded sleeve 221.

[0044] The valve stem 3 includes a circular handle 31 and a valve stem 33. A valve disc 333 is provided at the end of the valve stem 33. The valve disc 333 is located directly below the limiting member 13. A spring 334 is snapped onto the top of the valve disc 333. A secondary valve disc 335 is sleeved on the top of the spring 334. The secondary valve disc 335 is inserted into the inner side of the limiting member 13. A bellows 336 is sleeved on the outer side of the spring 334.

[0045] The sealing design at the valve stem 33 connection is changed from waterproof packing to a sealing ring design. A removable flange cover 22 is installed, and the second sealing ring 24 is fixed in the second arc groove 214 by the threaded connection of the flange cover 22 to the first sealing flange 21. This ensures that the second sealing ring 24 is tightly fitted to the valve stem 33 to prevent leakage. When the valve is opened, the valve disc 333 moves upward under the action of the valve stem 33, and the secondary valve disc 335 is fitted against the limiting member 13 under the action of the spring 334, improving the sealing effect from multiple directions. At this time, removing the flange cover 22 to replace the second sealing ring 24 will not affect normal use.

[0046] Furthermore, the valve body 1 includes a valve shell 11 and a connecting flange 12. The valve shell 11 has an input end 111 and an output end 112 at its two ends, respectively. A barrier 113 is provided inside the valve shell 11, and a valve hole 114 is provided on the barrier 113. A limiting member 13 is provided inside the valve shell 11, and the limiting member 13 is located directly above the valve hole 114. A plurality of connecting holes 121 are provided on the top of the connecting flange 12, and a first arc groove 122 is provided on the top of the connecting flange 12, and the first arc groove 122 is located inside the connecting holes 121.

[0047] Furthermore, the first sealing flange 21 is also provided with a plurality of sealing holes 211, the sealing holes 211 being positioned corresponding to the connection holes 121, and a first threaded sleeve 212 being provided inside the first sealing flange 21.

[0048] Specifically disclosed, the sealing flange 2 also includes a first sealing ring 23 and a connecting bolt 25. The first sealing ring 23 is disposed in the first arc groove 122, and the connecting bolt 25 is inserted into the sealing hole 211 and the connecting hole 121 and is fitted with a nut 251.

[0049] Specifically disclosed, the circular handle 31 is provided with an opening 311, and a fixing bolt 32 is inserted into the opening 311. The fixing bolt 32 passes through the opening 311 and is connected to the top of the valve stem 33. The top of the valve stem 33 is provided with a fixing hole 331, and the fixing hole 331 is threadedly connected to the fixing bolt 32. The middle part of the valve stem 33 is provided with a screw 332.

[0050] It should be particularly emphasized that the screw 332 is threadedly connected to the first threaded sleeve 212, the valve disc 333 is positioned corresponding to the valve hole 114, and the upper part of the valve stem 33 is tightly attached to the second sealing ring 24.

[0051] Working principle:

[0052] First, seal the inlet 111 to the outlet liquid pipeline and seal the outlet 112 to the inlet liquid pipeline. Rotating the circular handle 31 rotates the valve stem 33. Under the action of the screw 332 and the first threaded sleeve 212, the valve stem 33 moves downwards. This downward movement of the valve stem 33 causes the valve disc 333 to move downwards. When the valve disc 333 is tightly fitted with the valve hole 114, the valve is closed, thus stopping the liquid flow. If leakage occurs at the valve stem 33, remove the fixing bolt 32, remove the circular handle 31, and then unscrew the flange cover 22 to replace the second sealing ring 24.

[0053] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A line-sealed gate valve, comprising a valve body (1), a sealing flange (2), and a valve stem (3), wherein the sealing flange (2) is disposed above the valve body (1), and the valve stem (3) passes through the sealing flange (2) and is connected to the valve body (1), characterized in that, The valve body (1) includes: Valve housing (11), with a limiting element (13) connected to the inner side of the valve housing (11); Connecting flange (12); The sealing flange (2) includes: The first sealing flange (21) has a second arc groove (214) on its top and a thread (213) on its outer side. Flange cover (22), wherein a second threaded sleeve (221) is provided inside the flange cover (22); The second sealing ring (24) is disposed inside the second arc groove (214); The first sealing flange (21) and the flange cover (22) are connected by a thread (213) and a second threaded sleeve (221); The valve stem (3) includes: Round throttle (31); A valve stem (33) is provided at the end of the valve stem (33), the valve disc (333) is located directly below the limiting member (13), a spring (334) is snapped onto the top of the valve disc (333), a secondary valve disc (335) is sleeved on the top of the spring (334), the secondary valve disc (335) is inserted into the inner side of the limiting member (13), and a bellows (336) is sleeved on the outer side of the spring (334).

2. The line-seal shut-off valve according to claim 1, characterized in that, The valve housing (11) is provided with an input end (111) and an output end (112) at both ends. A barrier (113) is provided inside the valve housing (11). A valve hole (114) is provided on the barrier (113). The valve hole (114) is located directly below the limiting member (13). A plurality of connecting holes (121) are provided on the top of the connecting flange (12). A first arc groove (122) is provided on the top of the connecting flange (12). The first arc groove (122) is located inside the connecting hole (121).

3. A line-seal shut-off valve according to claim 1, characterized in that, The first sealing flange (21) is also provided with a plurality of sealing holes (211), the sealing holes (211) are corresponding to the connection holes (121), and a first threaded sleeve (212) is provided inside the first sealing flange (21).

4. A line-seal shut-off valve according to claim 1, characterized in that, The sealing flange (2) also includes a first sealing ring (23) and a connecting bolt (25). The first sealing ring (23) is disposed in the first arc groove (122). The connecting bolt (25) is inserted into the sealing hole (211) and the connecting hole (121) and is fitted with a nut (251).

5. A line-seal shut-off valve according to claim 1, characterized in that, The circular throttle (31) is provided with an opening (311), and a fixing bolt (32) is inserted into the opening (311). The fixing bolt (32) passes through the opening (311) and is connected to the top of the valve stem (33). The top of the valve stem (33) is provided with a fixing hole (331), and the fixing hole (331) is threaded to the fixing bolt (32). The middle part of the valve stem (33) is provided with a screw (332).

6. A line-seal shut-off valve according to claim 5, characterized in that, The screw (332) is threadedly connected to the first threaded sleeve (212), the valve disc (333) is positioned corresponding to the valve hole (114), and the upper part of the valve stem (33) is tightly attached to the second sealing ring (24).

Images