Anti-scouring duplex stop valve

Abstract

The utility model discloses an anti-scouring duplex stop valve, and relates to the related technical field of stop valves. The stop valve comprises a stop valve body, a liquid inlet and a liquid outlet are formed in the two side faces of the stop valve body respectively, a first stop chamber and a second stop chamber are formed in the stop valve body respectively, and a penetrating opening communicated with the second stop chamber is formed in one inner side wall of the first stop chamber. Valve rods are installed in the first cut-off chamber and the second cut-off chamber correspondingly, one end of each valve rod is movably connected with a valve clack, and the two valve clacks are matched with the liquid outlet and the penetrating opening correspondingly. When sewage is discharged, the liquid outlet is firstly controlled to be opened, then the penetrating opening is controlled to be opened, the sewage is discharged from the liquid outlet through the penetrating opening, when discharging is stopped, the penetrating opening is firstly controlled to be closed, then the liquid outlet is controlled to be closed, and discharging of the sewage is stopped, so that the phenomenon that the sewage is blocked when a medium is discharged and medium pressure is released is avoided; and gas contained in the medium is released to perform cavitation on the sealing surface, so that the sealing surface is protected.

Description

Technical Field

[0001] This utility model belongs to the technical field of gate valves, and in particular relates to an anti-erosion double gate valve. Background Technology

[0002] Gate valves apply torque through the valve stem to make the valve disc and valve seat seal tightly, thereby preventing the medium from leaking out of the gap. They play the roles of cutting off, throttling, and regulating in pipelines. During the opening and closing process, the friction between the sealing surfaces is small. They are easy to manufacture and maintain. They are suitable not only for medium and low pressure environments, but also for high pressure environments. At the same time, the flow rate of the medium can be controlled by adjusting the opening degree of the valve disc, so as to achieve precise flow regulation.

[0003] Common gate valves control opening and closing by adjusting the movement of the valve disc to ensure a tight seal between the disc and seat. However, in practical use, as the valve operates, the medium pressure releases, releasing gases that may burst onto the surface of small spaces, potentially causing cavitation on the sealing surface and affecting the sealing effect. To address this, we provide an anti-erosion double gate valve to solve the aforementioned technical problems. Utility Model Content

[0004] The purpose of this utility model is to provide an anti-erosion double stop valve, which solves the problems in the background art by the specific structural design of the stop valve body, valve stem and valve disc.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0006] This utility model relates to an anti-erosion double shut-off valve, comprising a shut-off valve body, an inlet on one side of the valve body, an outlet on the lower surface of the valve body, and a first shut-off chamber and a second shut-off chamber inside the valve body. The first shut-off chamber is connected to the outlet, and the second shut-off chamber is connected to the inlet. A through-hole communicating with the second shut-off chamber is provided on the inner side wall of the first shut-off chamber. A valve stem that can move up and down is installed inside both the first and second shut-off chambers. A valve disc is movably connected to one end of the valve stem. The lower end of the valve disc has a conical sliding surface structure. One valve disc is adapted to the outlet, and the other valve disc is adapted to the through-hole. By controlling the up and down movement of the valve stem, the two valve discs are controlled to be tightly attached to or separated from the corresponding outlet or through-hole.

[0007] The present invention is further configured such that a first mounting port is provided on the upper surface of the valve body of the shut-off valve, and a second mounting port is provided on one side of the valve body adjacent to the liquid inlet. Hollow support seats are fixedly connected to the surfaces of the first mounting port and the second mounting port.

[0008] The present invention is further configured such that an adjustable support frame is fixedly installed on the periphery of the hollow support base, and a valve stem nut is rotatably connected to the side of the adjustable support frame away from the hollow support base, and the valve stem nut is threadedly engaged with the valve stem; a handwheel is fixedly connected to the surface of the valve stem nut away from the hollow support base, and a lifting port is opened at the center of the handwheel shaft, and the valve stem coaxially passes through the lifting port.

[0009] The present invention is further configured such that a packing pad is slidably disposed on the circumferential side of the valve stem, the packing pad is fixedly connected to the inner wall of the valve body of the shut-off valve, and a rectifier sleeve is tightly attached to the side of the packing pad away from the adjusting support frame; the rectifier sleeve is fixedly connected to the inner wall of the corresponding first shut-off chamber and the corresponding second shut-off chamber, and two liquid inlets are symmetrically opened on the circumferential side of the rectifier sleeve, the valve disc is attached to the inner wall of the corresponding rectifier sleeve, and the circumferential side of the valve disc is attached to both liquid inlets.

[0010] The present invention is further configured such that a packing sleeve is slidably disposed on the surface of the hollow support base away from the valve body of the shut-off valve, a packing pressure plate is tightly disposed on the upper surface of the packing sleeve, and the packing pressure plate is connected to the adjusting support frame by a swivel bolt.

[0011] This utility model has the following beneficial effects:

[0012] This invention, by setting a shut-off valve body, valve stem, and valve disc, allows for the following control mechanisms: When sewage needs to be discharged, the valve disc on the outlet side is first moved away from the outlet, opening the outlet; then, the valve disc on the through-port side is moved away from the through-port, opening the through-port. When sewage discharge is stopped, the valve disc on the through-port side is first moved closer to the through-port until the through-port is closed; then, the valve disc on the outlet side is moved closer to the outlet until the outlet is closed. This achieves the goal of sacrificing one side of the valve disc and sealing ring while maintaining the sealing effect between the other side of the valve disc and sealing ring during media discharge, thus reducing the impact of cavitation.

[0013] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments 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.

[0015] Figure 1 This is a schematic diagram of the structure of an anti-erosion double shut-off valve.

[0016] Figure 2 for Figure 1 Another structural diagram from a different angle.

[0017] Figure 3 This is a longitudinal structural sectional view of the present invention.

[0018] Figure 4 This is a partial structural schematic diagram of the present invention.

[0019] Figure 5 for Figure 4 A longitudinal structural sectional view.

[0020] Figure 6 This is a partial structural schematic diagram of the present invention.

[0021] Figure 7 This is a wastewater discharge flow chart; where A1 is the closed state diagram, A2 is the slightly open state diagram, and A3 is the open state diagram.

[0022] The attached diagram lists the components represented by each number as follows:

[0023] 1-Stop valve body, 2-Inlet, 3-Outlet, 4-Through port, 5-Valve stem, 6-Valve disc, 7-Adjusting support frame, 8-Valve stem nut, 9-Handwheel, 10-Packaging gasket, 11-Rectifying sleeve, 12-Liquid inlet, 13-Packaging sleeve, 14-Packaging plate. Detailed Implementation

[0024] 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 skilled in the art without creative effort are within the protection scope of the present utility model.

[0025] For specific embodiment 1, please refer to Figure 1-6 This utility model is an anti-erosion double shut-off valve, including a shut-off valve body 1. Specifically, a liquid inlet 2 is provided on one side of the shut-off valve body 1, and a liquid outlet 3 is provided on the lower surface of the shut-off valve body 1. A first shut-off chamber and a second shut-off chamber are respectively provided inside the shut-off valve body 1. The first shut-off chamber is connected to the liquid outlet 3, and the second shut-off chamber is connected to the liquid inlet 2. A through-hole 4 connected to the second shut-off chamber is provided on the inner side wall of the first shut-off chamber.

[0026] Furthermore, both the first and second stop chambers are equipped with vertically movable valve stems 5. One end of the valve stem 5 is movably connected to a valve disc 6. The lower end of the valve disc 6 has a conical sliding surface structure. One valve disc 6 is adapted to the outlet 3. The corresponding valve stem 5 drives one valve disc 6 to move up and down synchronously. When the valve disc 6 is in close contact with the outlet 3, the outlet 3 is in a closed state. When the valve disc 6 is away from the outlet 3, the outlet 3 is in an open state. The other valve disc 6 is adapted to the through port 4. The corresponding valve stem 5 drives the other valve disc 6 to move up and down synchronously. When the valve disc 6 is in close contact with the through port 4, the through port 4 remains closed. When the valve disc 6 is away from the through port 4, the through port 4 opens, and sewage enters the second stop chamber. The valve stem 5 is controlled to move up and down, thereby controlling the two valve discs 6 to be in close contact with or separate from the corresponding outlet 3 or through port 4.

[0027] The operation process of this embodiment is as follows: Before discharging sewage, the two valve discs 6 are tightly attached to the corresponding outlet 3 or through port 4, so that the outlet 3 and through port 4 are kept in a sealed state. When sewage needs to be discharged, first control the corresponding valve rod 5 to move away from the outlet 3, which drives the valve disc 6 on the side of the outlet 3 to move away from the outlet 3 at the same time, and the outlet 3 is opened. Then control the corresponding other valve rod 5 to move away from the through port 4, which drives the valve disc 6 on the side of the through port 4 to move away from the through port 4 at the same time, and the through port 4 is opened. Sewage enters the second stop chamber through the inlet 2, then enters the first stop chamber through the through port 4, and is finally discharged from the outlet 3.

[0028] When sewage discharge stops, control the corresponding valve stem 5 to move towards the through port 4, causing the valve disc 6 on the side of the through port 4 to move synchronously towards the through port 4 until the valve disc 6 is in close contact with the through port 4. At this time, the through port 4 is closed, and sewage stops flowing into the second shut-off chamber. Then control the corresponding valve stem 5 to move towards the outlet port 3, causing the valve disc 6 on the side of the outlet port 3 to move synchronously towards the outlet port 3 until the valve disc 6 is in close contact with the outlet port 3. The outlet port 3 is closed, and sewage discharge stops.

[0029] For a specific embodiment two, please refer to Figure 1-6 Based on the specific embodiment one, specifically, a first mounting port is opened on the upper surface of the shut-off valve body 1, and a second mounting port is opened on one side of the shut-off valve body 1 adjacent to the liquid inlet 2. Hollow support seats are fixedly connected to the surfaces of the first mounting port and the second mounting port.

[0030] Furthermore, an adjusting support frame 7 is fixedly installed on the periphery of the hollow support base. A valve stem nut 8 is rotatably connected to the side of the adjusting support frame 7 away from the hollow support base. The valve stem nut 8 and the valve stem 5 are threaded together. A handwheel 9 is fixedly connected to the surface of the valve stem nut 8 away from the hollow support base. Rotating the handwheel 9 drives the valve stem nut 8 to rotate synchronously. Under the threaded engagement between the valve stem nut 8 and the valve stem 5, the valve stem 5 moves up and down. A lifting port is opened at the axis of the handwheel 9. The valve stem 5 passes through the lifting port coaxially. When the valve stem 5 moves up and down, the valve stem 5 passes through the lifting port. The position of the valve disc 6 can be determined by observing the distance the valve stem 5 moves up and down.

[0031] Furthermore, a packing pad 10 is slidably disposed on the side of the valve stem 5. The packing pad 10 is fixedly connected to the inner wall of the valve body 1 of the shut-off valve. The packing pad 10 can maintain a tight seal to prevent sewage leakage. The side of the packing pad 10 away from the adjusting support frame 7 is closely attached to the rectifier sleeve 11. The rectifier sleeve 11 is fixedly connected to the inner wall of the corresponding first shut-off chamber and the second shut-off chamber. Two liquid inlets 12 are symmetrically opened on the side of the rectifier sleeve 11. The valve disc 6 is attached to the inner wall of the corresponding rectifier sleeve 11. The side of the valve disc 6 is attached to both liquid inlets 12. The movement of the valve disc 6 causes the liquid inlets 12 to be opened or closed, thereby controlling the shut-off of sewage.

[0032] Furthermore, a packing sleeve 13 is slidably disposed on the surface of the hollow support base away from the valve body 1 of the shut-off valve. A packing pressure plate 14 is tightly disposed on the upper surface of the packing sleeve 13. The packing pressure plate 14 is connected to the adjusting support frame 7 by a swivel bolt. In the initial state, by controlling the packing pressure plate 14 to move downward, the packing sleeve 13 moves downward synchronously, maintaining the sealed state inside the valve body 1 of the shut-off valve.

[0033] The operation process of this embodiment is as follows: In the initial state, the inlet 2 is connected to the sewage discharge pipe, and the two valve discs 6 are respectively in close contact with the corresponding outlet 3 or through-hole 4 (e.g., Figure 7 As shown in A1); when sewage needs to be discharged, the handwheel 9 on the outlet 3 side and the handwheel 9 on the through port 4 side can be rotated simultaneously, so that a small gap is left between the valve disc 6 on the outlet 3 side and the outlet 3, and between the valve disc 6 on the through port 4 side and the through port 4 (as shown in A1). Figure 7 As shown in A2), at this time it is in a slightly open state, with only a small flow passing through the gap, which can protect the sealing surface and prevent the sealing surface from being eroded by a large flow. Alternatively, the handwheel 9 on the side of the outlet 3 can be rotated first, which drives the corresponding valve stem nut 8 to rotate synchronously. Under the threaded engagement of the valve stem nut 8 and the valve stem 5, the corresponding valve stem 5 is driven to move, so that the valve stem 5 drives the valve disc 6 on the side of the outlet 3 to move synchronously away from the outlet 3. When the valve disc 6 moves away from the outlet 3, the outlet 3 is opened (as shown in A2). Figure 7As shown in Figure A3), the liquid outlet 3 side liquid inlet 12 is opened simultaneously; then the handwheel 9 on the through port 4 is rotated, and under the threaded engagement of the corresponding valve stem nut 8 and valve stem 5, the corresponding valve stem 5 drives the valve disc 6 on the through port 4 to move synchronously away from the through port 4, so that the through port 4 is opened (as shown in Figure A3). Figure 7 As shown in A3), the liquid inlet 12 near the through-hole 4 is opened simultaneously; when the liquid inlet 12 on the through-hole 4 side is opened, the sewage enters the second stop chamber through the through-hole 4 through the liquid inlet 12 on the through-hole 4 side, and is discharged through the outlet 3. When a large flow of sewage flows through the through-hole 4, the pressure of the sewage is suddenly released, causing the gas in the sewage to be released. The released gas first explodes on the surface of the through-hole 4, causing cavitation on the surface of the through-hole 4. When the sewage flows through the outlet 3, the pressure is small and no gas is released, thus protecting the outlet 3 and the sealing surface on the side of the outlet 3.

[0034] When sewage discharge is stopped, first turn the handwheel 9 on the side of the through-port 4 in the reverse direction, causing the valve stem nut 8 to rotate in the reverse direction. Under the threaded engagement of the valve stem nut 8 and the valve stem 5, the valve stem 5 causes the valve disc 6 on the side of the through-port 4 to move synchronously and gradually approach the through-port 4 until the valve disc 6 on the side of the through-port 4 is tightly pressed against the through-port 4, the through-port 4 is closed, and the liquid inlet 12 on the side of the through-port 4 is pressed against the valve disc 6 on the side of the through-port 4, keeping the liquid inlet 12 on the side of the through-port 4 sealed, thus stopping the sewage from flowing into the second shut-off chamber. Then turn the handwheel 9 on the side of the outlet 3 in the reverse direction, causing the corresponding valve stem 5 to move synchronously and gradually approach the outlet 3 until the valve disc 6 on the side of the outlet 3 is tightly pressed against the outlet 3, the outlet 3 is closed, and the liquid inlet 12 on the side of the outlet 3 is pressed against the valve disc 6 on the side of the outlet 3, keeping the liquid inlet 12 on the side of the outlet 3 sealed, thus completing the cessation of sewage discharge.

[0035] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0036] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. An anti-erosion double shut-off valve, comprising a shut-off valve body (1), characterized in that: The valve body (1) of the shut-off valve has an inlet (2) on one side and an outlet (3) on the lower surface of the valve body (1). The valve body (1) of the shut-off valve has a first shut-off chamber and a second shut-off chamber. The first shut-off chamber is connected to the outlet (3) and the second shut-off chamber is connected to the inlet (2). The first shut-off chamber has a through-hole (4) on its inner side wall that is connected to the second shut-off chamber. Both the first and second stop chambers are equipped with valve stems (5) that can move up and down. One end of the valve stem (5) is movably connected to a valve disc (6). The lower end of the valve disc (6) is a conical sliding surface structure. One valve disc (6) is adapted to the liquid outlet (3), and the other valve disc (6) is adapted to the through port (4). The valve stem (5) is controlled to move up and down, thereby controlling the two valve discs (6) to be tightly attached to or separated from the corresponding liquid outlet (3) or through port (4).

2. The anti-erosion double shut-off valve according to claim 1, characterized in that, The valve body (1) of the shut-off valve has a first mounting port on its upper surface and a second mounting port on one side of the valve body (1) adjacent to the liquid inlet (2). Both the first mounting port and the second mounting port are fixedly connected to hollow support seats.

3. The anti-erosion double shut-off valve according to claim 2, characterized in that, An adjustable support frame (7) is fixedly installed on the periphery of the hollow support base. A valve stem nut (8) is rotatably connected to the side of the adjustable support frame (7) away from the hollow support base. The valve stem nut (8) and the valve stem (5) are threaded together.

4. The anti-erosion double shut-off valve according to claim 3, characterized in that, A handwheel (9) is fixedly connected to a surface of the valve stem nut (8) away from the hollow support seat. A lifting port is provided at the axis of the handwheel (9), and the valve stem (5) passes through the lifting port coaxially.

5. The anti-erosion double shut-off valve according to claim 4, characterized in that, A packing pad (10) is slidably provided on the circumferential side of the valve stem (5). The packing pad (10) is fixedly connected to the inner wall of the valve body (1) of the shut-off valve. The side of the packing pad (10) away from the adjusting support frame (7) is closely attached to the rectifier sleeve (11).

6. The anti-erosion double shut-off valve according to claim 5, characterized in that, The rectifier sleeve (11) is fixedly connected to the inner wall of the corresponding first cutoff chamber and the second cutoff chamber. Two liquid inlets (12) are symmetrically opened on the periphery of the rectifier sleeve (11). The valve disc (6) is in contact with the inner wall of the corresponding rectifier sleeve (11). The periphery of the valve disc (6) is in contact with both liquid inlets (12).

7. The anti-erosion double shut-off valve according to claim 6, characterized in that, A packing sleeve (13) is slidably provided on one surface of the hollow support base away from the valve body (1) of the shut-off valve. A packing plate (14) is tightly attached to the upper surface of the packing sleeve (13). The packing plate (14) is connected to the adjusting support frame (7) by a swivel bolt.

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