A down-and-out valve without dead leg

Abstract

The utility model relates to the technical field of kettle bottom valve, specifically is a kind of lower spreading formula no stagnation kettle bottom valve, including valve body, valve cover, valve stem, hand wheel further include: connecting seat, cooperate with valve cover for installing valve stem, the inside of connecting seat is screwing connection with the thread portion of valve stem;Support, it is provided with two, it is mutually symmetrical to set in the periphery of valve stem, and it can be detachably fixed between valve cover and connecting seat;Stuffing gland, it is sleeved in the outer wall of valve stem, and the bottom end of stuffing gland is used for embedding in the packing cavity of valve cover and compaction packing. In the utility model, by being provided with detachable fixing support, when needing to replace packing, support can be disassembled, so that it no longer blocks in the periphery of valve stem and stuffing gland, and the operation space of operator's hand is expanded.

Description

Technical Field

[0001] This utility model relates to the field of bottom valve technology, specifically a bottom valve with downward expansion and no retention. Background Technology

[0002] Bottom valves are key valves installed at the bottom of containers such as reactors and storage tanks for discharging, feeding, sampling, or shutting off without dead zones. They are classified into top-expanding bottom valves, bottom-expanding bottom valves, plunger-type bottom valves, and bottom ball valves. Among them, the bottom-expanding bottom valve has a valve disc designed to expand downwards, meaning that the valve disc moves downwards when opening, thereby opening the valve. This design allows the material to be dynamically discharged during the valve opening process, achieving operation without dead zones, ensuring good discharge effect and preventing material accumulation at the bottom of the vessel.

[0003] In the application of bottom-mounted valves with no retention, valve maintenance and upkeep are crucial to ensuring their long-term stable operation. Among these, packing replacement is an important part of valve maintenance. The vertical rods on both sides of the valve stem on the valve cover are often fixedly connected to the valve cover. These vertical rods support and stabilize the valve stem during normal valve operation. However, during packing replacement, these fixed vertical rods become obstacles. They restrict the disassembly space of the packing gland, forcing operators to operate in a very limited space. Maintenance personnel cannot fully extend their hand movements, which increases the difficulty and complexity of packing replacement. Utility Model Content

[0004] The purpose of this invention is to provide a bottom-mounted valve with no retention to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A bottom-mounted, non-retention valve includes a valve body, a valve cover, a valve stem, a handwheel, and further includes:

[0007] A connecting seat, which mates with the valve cover for mounting the valve stem, wherein the interior of the connecting seat is screwed into the threaded portion of the valve stem;

[0008] There are two brackets, symmetrically arranged around the valve stem, which can be detachably fixed between the valve cover and the connecting seat;

[0009] A packing gland is fitted onto the outer wall of the valve stem, and the bottom end of the packing gland is used to embed into the packing cavity of the valve cover to compress the packing.

[0010] Furthermore, the valve cover has two symmetrical mounting grooves on its top side, and a connecting shaft is fixedly connected in each of the two mounting grooves. The bottom ends of the two brackets are respectively installed in the mounting grooves, and the bottom ends of the two brackets are provided with round holes that are rotatably connected to the connecting shafts.

[0011] Furthermore, the outer wall of the connecting seat is symmetrically and fixedly connected with two extension plates, and each of the two extension plates has a fitting groove on its end side that engages with the top of the bracket.

[0012] Furthermore, the two extension plates have through-holes on their sidewalls in the mating groove area, and the tops of the two brackets have round holes that match the installation. The extension plates and brackets are fixed by bolts.

[0013] Furthermore, two threaded posts are symmetrically installed on the top surface of the valve cover.

[0014] Furthermore, the packing gland includes a gland body and two ear plates. The top side of the gland body has two symmetrically arranged grooves. The top surface of each of the two grooves has two insertion slots. The bottom surface of each of the two ear plates is fixedly connected with an insertion block, and the insertion block is inserted into the insertion slot.

[0015] Furthermore, a U-shaped groove is provided through the top surface of both ear plates, and the U-shaped groove is engaged with the threaded post.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] The detachable mounting bracket allows the bracket to be removed when the packing needs to be replaced, so that it no longer obstructs the valve stem and packing gland, thus expanding the operator's hand operating space. Attached Figure Description

[0018] Figure 1-2 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the cross-sectional structure of region A in this utility model;

[0020] Figure 4 This is a schematic diagram of the structure of region B in this utility model;

[0021] Figure 5-6 This is a schematic diagram showing the disassembled structure of the packing gland in this utility model.

[0022] In the diagram: 100, valve body; 200, valve cover; 210, mounting groove; 220, connecting shaft; 230, threaded post; 300, valve stem; 400, handwheel; 500, connecting seat; 510, extension plate; 511, mating groove; 600, bracket; 700, packing gland; 710, gland body; 711, groove; 712, insertion groove; 720, ear plate; 721, U-shaped groove; 722, insertion block. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1-6 In this embodiment of the present invention, a bottom-mounted valve with no retention includes a valve body 100, a valve cover 200, a valve stem 300, a handwheel 400, a connecting seat 500, a bracket 600, and a packing gland 700. The connecting seat 500 cooperates with the valve cover 200 to install the valve stem 300. The connecting seat 500 has a threaded hole inside that matches the thread of the valve stem 300. The interior of the connecting seat 500 is screwed into the thread of the valve stem 300. Through a tight fit with the valve cover 200, it provides stable and reliable installation support for the valve stem 300. The bracket 600 has two... The valve stem 300 and valve cover 200 are symmetrically arranged around the valve stem 300. The support 600 can be made of high-quality carbon steel and processed by special technology to have sufficient strength and rigidity. The support 600 is fixed between the valve cover 200 and the connecting seat 500 by a specific detachable connection method. The packing gland 700 is sleeved on the outer wall of the valve stem 300. The packing gland 700 can be made of corrosion-resistant polytetrafluoroethylene material, which has good sealing and wear resistance. The bottom end of the packing gland 700 has a specific shape structure for embedding into the packing cavity of the valve cover 200 to compress the packing.

[0025] Specifically, when the valve needs to be opened, the operator turns handwheel 400 clockwise. Handwheel 400 drives valve stem 300 to rotate. Since valve stem 300 and connecting seat 500 are internally connected by threads, under the transmission action of the threads, valve stem 300 will move downwards. As valve stem 300 moves downwards, valve disc gradually moves away from valve seat, valve opens, and medium can flow in from the inlet of valve body 100, pass through the channel between valve disc and valve seat, and flow out from outlet. When the valve needs to be closed, the operator turns handwheel 400 counterclockwise. 00 drives the valve stem 300 to rotate in the opposite direction. Under the action of the threaded transmission, the valve stem 300 moves upward, causing the valve disc to gradually approach the valve seat and finally fit tightly against the valve seat, closing the valve and preventing the flow of the medium. When it is necessary to replace the packing, the bracket 600 is disassembled so that it no longer obstructs the valve stem 300 and the packing gland 700. At this time, the packing gland 700 can be removed, the packing in the packing cavity of the valve cover 200 is cleaned and refilled. After refilling, the packing gland 700 is reset, and then the two brackets 600 are installed and fixed.

[0026] Example 1

[0027] like Figure 2-4As shown, in this embodiment, two mounting grooves 210 are symmetrically formed on the top side of the valve cover 200. A connecting shaft 220 is fixedly connected to each of the two mounting grooves 210. The bottom ends of the two brackets 600 are respectively installed in the two mounting grooves 210, and each bottom end of the brackets 600 has a circular hole for rotatably engaging with the connecting shaft 220. Two extension plates 510 are symmetrically fixedly connected to the outer wall of the connecting seat 500. Each end of the extension plates 510 has a fitting groove 511 that engages with the top end of the bracket 600. Mounting holes are formed through the side walls of the two extension plates 510 in the area of ​​the fitting groove 511. The diameter of the mounting holes is determined according to the selected bolt specifications. The top ends of the two brackets 600 have circular holes matching the mounting holes. The extension plates 510 and the brackets 600 are fixed together by bolts.

[0028] In this embodiment, when replacing the packing, first use a tool to remove the nuts on the bolts that fix the extension plate 510 and the bracket 600, and pull out the bolts so that the bracket 600 and the extension plate 510 are no longer restricted in their connection. At this time, rotate the bracket 600 around the connecting shaft 220 so that the two brackets 600 are no longer erected on the periphery of the valve stem 300, thereby increasing the operator's hand operating space and facilitating the subsequent disassembly of the packing gland 700 and cleaning and replacement of the packing.

[0029] Example 2

[0030] Based on Example 1, in order to further expand the operating space and reduce the obstruction of the packing gland 700 to the operator.

[0031] like Figure 4-6 As shown, in this embodiment, two threaded posts 230 are symmetrically installed on the top surface of the valve cover 200. The packing gland 700 includes a gland body 710 and two ear plates 720. Two grooves 711 are symmetrically formed on the top side of the gland body 710. Two insertion slots 712 are formed on the top surface of each groove 711. Insertion blocks 722 are fixedly connected to the bottom surface of each ear plate 720. The shape of the insertion blocks 722 is adapted to the insertion slots 712, and the insertion blocks 722 and insertion slots 712 are inserted into each other. A U-shaped groove 721 is formed through the top surface of each ear plate 720, and the U-shaped groove 721 is inserted into the threaded posts 230.

[0032] In practice, after flipping the two brackets 600, use a wrench to loosen the nut at the interface between the U-shaped groove 721 and the threaded post 230 on the ear plate 720 of the packing gland 700. After completely removing the nut, gently lift the packing gland 700 upwards to detach it from the packing cavity of the valve cover 200. Then, lift the two ear plates 720 upwards to disengage the insertion block 722 from the insertion groove 712. Next, move the two ear plates 720 in the opposite direction to separate them from the gland body 710. Finally, use a screwdriver or other suitable tool to carefully remove the packing from the valve cover 200. Remove the old packing ring by ring from the packing cavity. Use a clean cloth or brush to clean the residual packing and impurities in the packing cavity. According to the diameter of the valve stem 300 and the depth of the packing cavity, cut the new packing to the appropriate length and width, insert it and compact it. Then align the bottom end of the gland body 710 and embed it into the packing cavity. Align the U-shaped groove 721 on the ear plate 720 with the threaded post 230 and insert it. Then move it down along the threaded post 230 so that the insertion block 722 is inserted into the insertion groove 712. Put the nut on the threaded post 230 and tighten it. Finally, install and reset the two brackets 600.

[0033] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0034] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A bottom-mounted, non-retention valve, comprising a valve body (100), a valve cover (200), a valve stem (300), and a handwheel (400), characterized in that, Also includes: A connecting seat (500) is used to mate with a valve cover (200) for mounting a valve stem (300). The interior of the connecting seat (500) is screwed into the thread of the valve stem (300). There are two brackets (600), which are symmetrically arranged around the valve stem (300) and can be detachably fixed between the valve cover (200) and the connecting seat (500); A packing gland (700) is fitted onto the outer wall of the valve stem (300). The bottom end of the packing gland (700) is used to embed into the packing cavity of the valve cover (200) to press the packing.

2. The bottom-mounted, non-retention-free valve according to claim 1, characterized in that, The valve cover (200) has two symmetrical mounting grooves (210) on its top side. A connecting shaft (220) is fixedly connected in each of the two mounting grooves (210). The bottom ends of the two brackets (600) are respectively installed in the mounting grooves (210), and the bottom ends of the two brackets (600) are provided with round holes that are rotatably connected to the connecting shaft (220).

3. The bottom-mounted, non-retention-free valve according to claim 1, characterized in that, The outer wall of the connecting seat (500) is symmetrically fixedly connected with two extension plates (510), and each of the two extension plates (510) has a fitting groove (511) on its end side that engages with the top of the bracket (600).

4. The bottom-mounted, non-retention-free valve according to claim 3, characterized in that, The two extension plates (510) have mounting holes through the sidewalls of the mating groove (511) area, and the tops of the two brackets (600) have round holes that match the installation. The extension plates (510) and brackets (600) are fixed by bolts.

5. The bottom-mounted, non-retention-free valve according to claim 1 or 2, characterized in that, Two threaded posts (230) are symmetrically mounted on the top surface of the valve cover (200).

6. The bottom-mounted, non-retention-free valve according to claim 1, characterized in that, The packing gland (700) includes a gland body (710) and two ear plates (720). The top side of the gland body (710) has two grooves (711) symmetrically opened. The top surface of each groove (711) has two insertion slots (712). The bottom surface of each ear plate (720) is fixedly connected with an insertion block (722), and the insertion block (722) is inserted into the insertion slot (712).

7. The bottom-mounted, non-retention-free valve according to claim 6, characterized in that, Both ear plates (720) have a through U-shaped groove (721) on their top surfaces, which is inserted into the threaded post (230).

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