A wedge gate valve for a water hammer

Abstract

This utility model relates to a wedge gate valve for preventing water hammer, comprising a valve body, a valve plate, a valve stem, and a sealing ring. An annular locking block at the lower end of the valve stem engages with the mating valve plate. A handwheel is fixed to the valve stem, and rotation raises and lowers the gate plate. The valve plate sealing surface has an inclined structure, and the sealing ring has an annular groove that engages with a protruding groove on the valve plate. The outer edge is deformable, deforming along the inclined surface to fit against the inner wall of the valve body when closed, forming a reliable flexible seal. Guide plates are fixed on both sides of the valve body passage. A flow-diverting column is located at the intersection of the mesh holes on the guide plates. The surface of the flow-diverting column has guide grooves to guide the fluid to disperse and flow around the valve, reducing the flow velocity and extending the residence time, thereby mitigating the impact of water hammer on the valve plate when the gate valve is closed quickly.

Description

Technical Field

[0001] This utility model relates to the field of valve manufacturing technology, and in particular to a wedge gate valve for preventing water hammer. Background Technology

[0002] Gate valves are valve devices commonly used in pipeline systems to control the flow of fluid. They have advantages such as simple structure, reliable sealing performance, wide applicability, and convenient maintenance.

[0003] To improve sealing performance, enhance opening and closing flexibility, and extend service life, some technical solutions embed sealing rings on the gate or valve seat, achieving a good sealing effect through the cooperation between the sealing ring and the sealing surface. However, these wedge gate valves with sealing ring structures still face the following technical challenges: during the rapid closing process of the gate valve, the fluid in the system may generate instantaneous back pressure, i.e., water hammer effect. The sealing ring is prone to falling off due to long-term impact, thus affecting sealing reliability, overall service life, and operational safety. Summary of the Invention

[0004] This utility model aims to provide a wedge gate valve that is resistant to water hammer, which can improve sealing performance and solve the problem of easy detachment of the sealing ring caused by water hammer impact due to long-term rapid closure of the gate valve, thereby effectively improving the service life and sealing reliability of the valve.

[0005] The technical solution of this utility model is as follows: A wedge gate valve for preventing water hammer includes: a valve body assembly, on which a valve plate space is formed; a valve plate, which is movably disposed within the valve plate space, and an annular groove is formed on the side of the valve plate away from the valve plate space; a valve stem, which is rotatable around its own axis and movable along its own axis direction within the valve plate space; and a sealing ring, which is snapped into the annular groove on the valve plate; wherein, the valve body assembly has a fluid channel, and a guide plate is formed on the inner wall of the fluid channel, the guide plate being located on both sides of the valve plate space and communicating with the fluid channel and the valve plate space.

[0006] Furthermore, according to the aforementioned wedge gate valve for waterproof hammer, the lower end of the valve stem is provided with an annular locking block, the valve plate is composed of two plates joined together, the annular locking block of the valve stem is rotatably locked between the two valve plates, and when the valve stem rotates, it drives the valve plate to move in the valve plate space along its axial direction.

[0007] Preferably, according to the aforementioned wedge gate valve for preventing water hammer, the sealing ring has an annular groove communicating with its inner wall, and the valve plate has a corresponding annular protrusion. The sealing ring is engaged and fixed with the protrusion on the valve plate through the annular groove. The sealing surface of the valve plate is inclined, and the outer edge of the sealing ring is arc-shaped or has a deformable structure. When the valve plate is closed, the sealing ring is compressed and deformed along the inclined sealing surface, fitting against the channel wall of the valve body assembly.

[0008] More specifically, in some embodiments, according to the aforementioned wedge gate valve for preventing water hammer, the guide plate is fixed on the side of the valve body away from the valve plate space, the guide plate has multiple grid apertures, and a flow-diverting column is provided in the area where the grid apertures intersect and merge, the column extending along the direction of the fluid channel.

[0009] Furthermore, according to the aforementioned wedge gate valve for preventing water hammer, a guide groove is provided on the diversion column to guide local fluid flow around it.

[0010] Preferably, according to the aforementioned wedge gate valve for preventing water hammer, the valve body assembly further includes a handwheel, which is fixedly connected to the valve stem and used to drive the valve stem to rotate around the axis of the valve stem.

[0011] This invention achieves a flexible seal by using a snap-fit ​​sealing ring with an inclined valve plate sealing surface, resulting in pressure deformation and improved sealing performance. Simultaneously, a ring-shaped snap-fit ​​connection between the valve stem and valve plate ensures stable opening and closing. An annular sealing ring is installed on the valve plate via an annular groove, and a guide plate and flow divider structure are installed inside the valve body to effectively guide fluid direction, mitigate water hammer impact, and prevent sealing ring detachment and sealing surface erosion. This enhances the valve's sealing reliability and service life. The overall structure is compact and easy to operate, making it suitable for various pipeline systems with high sealing performance requirements. Attached Figure Description

[0012] Figure 1 A cross-sectional view of a wedge gate valve for preventing water hammer provided in an embodiment of this application;

[0013] Figure 2 A side view of a wedge gate valve for preventing water hammer, provided as an embodiment of this application;

[0014] Figure 3 for Figure 2 An enlarged structural diagram of area A of a wedge gate valve for preventing water hammer is provided in an embodiment of this application;

[0015] Figure 4 A schematic diagram of the valve plate structure of a wedge gate valve for preventing water hammer provided in an embodiment of this application;

[0016] Figure 5 An exploded view of the valve plate structure of a wedge gate valve for preventing water hammer, provided in an embodiment of this application;

[0017] Attached icon numbers:

[0018] 1. Valve body assembly; 2. Handwheel; 21. Annular groove; 3. Valve stem; 31. Annular retaining block; 4. Valve plate; 5. Guide plate; 51. Diverting column; 6. Sealing ring; 61. Annular groove. Detailed Implementation

[0019] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of this application.

[0020] Gate valves are valve devices commonly used in pipeline systems to control the flow of fluid. They have advantages such as simple structure, reliable sealing performance, wide applicability, and convenient maintenance.

[0021] To improve sealing performance, enhance opening and closing flexibility, and extend service life, some technical solutions embed sealing rings on the gate or valve seat, achieving a good sealing effect through the cooperation between the sealing ring and the sealing surface. However, these wedge gate valves with sealing ring structures still face the following technical challenges: during the rapid closing process of the gate valve, the fluid in the system may generate instantaneous back pressure, i.e., water hammer effect. The sealing ring is prone to falling off due to long-term impact, thus affecting sealing reliability, overall service life, and operational safety.

[0022] In response, this utility model aims to provide a wedge gate valve that is resistant to water hammer, which can improve sealing performance and solve the problems of easy detachment of the sealing ring and easy damage to the sealing surface caused by water hammer impact due to long-term rapid closure of the gate valve, thereby effectively improving the service life and sealing reliability of the valve.

[0023] This embodiment discloses a wedge gate valve for preventing water hammer, comprising: a valve body assembly 1, on which a valve plate 4 space is provided; a valve plate 4, which is movably disposed within the valve plate 4 space, and an annular groove 61 is provided on the side of the valve plate 4 away from the valve plate 4 space; a valve stem 3, which is rotatable around its own axis and movable along its own axis direction and disposed within the valve plate 4 space; and a sealing ring 6, which is snapped into the annular groove 61 on the valve plate 4; wherein, the valve body assembly 1 has a fluid channel, and a guide plate 5 is provided on the inner wall of the fluid channel, the guide plate 5 being located on both sides of the valve plate 4 space and communicating with the fluid channel and the valve plate 4 space.

[0024] It is understood that the basic components of the wedge gate valve with anti-sealing ring detachment of this utility model include: valve body assembly 1, valve plate 4, valve stem 3, and sealing ring 6. The space of valve plate 4 refers to the cavity structure inside valve body assembly 1 used to accommodate the vertical movement of valve plate 4; valve plate 4 is disposed in this space and can move up and down along valve stem 3 to open and close the channel; valve plate 4 has an annular groove 61 on the side away from the fluid channel for installing a seal; the sealing ring is snapped into the groove of valve plate 4 to seal against the fluid channel of the valve body; valve stem 3 can not only rotate around its axis but also move axially to control the opening and closing of valve plate 4; guide plates 5 are provided on both sides of the fluid channel of the valve body, which connect the channel and the space of valve plate 4 and can guide and mitigate water flow impact.

[0025] Specifically, the user externally drives the valve stem 3 to rotate, causing the valve plate 4 to move up and down within its space. When the valve plate 4 is pressed down to the closed position, the sealing ring 6 presses against the inner wall of the valve body, achieving a seal. The guide plate 5 guides the fluid flow, reducing direct impact on the sealing ring. This structure achieves reliable up-and-down opening and closing, a stable flexible sealing effect, and optimizes the fluid flow pattern through the guide plate 5, thereby improving the durability and sealing reliability of the gate valve.

[0026] In some embodiments, the lower end of the valve stem 3 is provided with an annular locking block 31, and the valve plate 4 is composed of two plates joined together. The annular locking block 31 of the valve stem 3 is rotatably locked between the two valve plates 4. When the valve stem 3 rotates, it drives the valve plate 4 to move in the space of the valve plate 4 along its axial direction.

[0027] It is understandable that this section involves the connection method between valve stem 3 and valve plate 4 and the resulting motion relationship.

[0028] The annular locking block 31 is an annular protrusion located at the lower end of the valve stem 3. It can rotate with the valve stem 3 and also slide relative to it in the valve plate 4. Due to its annular structure, it can form a locking effect on the valve stem 3, while ensuring uniform force distribution and preventing wear.

[0029] The valve plate 4 is formed by the mating of two plates: the valve plate 4 is assembled from two upper and lower pieces or two halves. This mating structure forms an annular clamping cavity in the middle for embedding and locking the annular locking block 31. Compared with the one-piece valve plate 4, the mating structure makes it easier to assemble the annular locking block 31 and makes disassembly and maintenance more convenient.

[0030] Specifically, during assembly, the annular locking block 31 at the lower end of the valve stem 3 is embedded between the valve plate 4 formed by the mating of two plates. The locking block can rotate inside the valve plate 4 but will not disengage. A helical drive structure is provided on the upper part of the valve stem 3. When the handwheel 2 drives the valve stem 3 to rotate, the locking block moves axially along the guide surface of the helical groove, thereby driving the clamped valve plate 4 to move up and down within the space of the valve plate 4, realizing the opening and closing of the valve. Since only the locking block slides relative to the valve plate 4 while the valve stem 3 rotates, the valve stem 3 itself will not move axially. This avoids additional wear between the valve stem 3 and the sealing components and ensures the linear movement of the valve plate 4.

[0031] In some embodiments, the sealing ring 6 is provided with an annular groove 61 communicating with its inner wall, and the valve plate 4 is provided with an annular protrusion 21. The sealing ring 6 is fixed by the groove and the protrusion on the valve plate 4. The sealing surface of the valve plate 4 is inclined, and the outer edge of the sealing ring 6 is arc-shaped or has a deformable structure. When the valve plate 4 is closed, the sealing ring 6 is compressed and deformed along the inclined sealing surface direction, and fits against the channel wall of the valve body assembly 1.

[0032] It can be understood that the annular groove 61 in this paragraph refers to the annular groove opened on the inner wall of the sealing ring 6, and its opening is connected to the inner diameter of the sealing ring; the annular protrusion 21 is the annular protrusion structure corresponding to the outer edge of the valve plate 4. The two cooperate with each other, and the sealing ring 6 is fitted onto the annular protrusion 21 of the valve plate 4 through its own groove, thereby realizing the positioning and fixing of the sealing ring and preventing the sealing ring from falling off during the opening and closing process.

[0033] The inclined sealing surface refers to the sealing contact surface between the valve plate 4 and the valve body, which is designed as an inclined surface rather than a traditional horizontal or vertical surface. This inclined surface intersects with the valve body channel wall along the axial direction of the valve stem 3, which facilitates the gradual compression and fit of the sealing ring 6 during tightening.

[0034] The outer edge of the sealing ring 6 is designed to be arc-shaped or have certain deformable characteristics. The purpose is to allow it to undergo elastic deformation in accordance with the tilt angle of the sealing surface of the valve plate 4 when compressed, thereby forming a larger contact area and a more uniform sealing pressure.

[0035] Specifically, during assembly, the annular groove 61 of the sealing ring 6 is fitted onto the annular protrusion 21 on the outer edge of the valve plate 4, forming a reliable snap-fit ​​relationship. When the valve is closed, the valve plate 4 is pressed downwards by the valve stem 3, and the inclined sealing surface on the valve plate 4 contacts and gradually presses against the arc-shaped outer edge of the sealing ring 6, causing the sealing ring 6 to undergo elastic deformation along the inclined direction. During this deformation process, the outer edge of the sealing ring 6 expands outwards and fits tightly against the inner wall of the valve body channel, ultimately forming a flexible annular seal.

[0036] In some embodiments, the guide plate 5 is fixed on the side of the valve body away from the space of the valve plate 4. The guide plate 5 has multiple grid apertures. A diversion column 51 is provided in the area where the grid apertures intersect and merge. The column extends along the direction of the fluid channel.

[0037] It can be understood that the guide plate 5 is a flow guiding element fixedly installed on the upper end of the valve plate 4, that is, on the side away from the space of the valve plate 4. Its main function is to guide the flow of the medium and buffer the impact. The "fixed installation" here means that the guide plate 5 is fixedly connected to the valve body. The guide plate 5 has multiple regularly arranged small holes, forming a grid-like aperture. These apertures allow the fluid to pass through, but they disperse the flow stream, dividing the overall water flow into multiple smaller unit flows, thereby reducing the concentrated impact of the flow velocity. The grid aperture intersection and confluence area refers to the area where the grid holes on the guide plate 5 meet, which is usually the intersection between the holes.

[0038] The flow divider column 51 refers to the columnar body installed in the aforementioned intersection and confluence area, extending axially along the fluid channel. This column further divides or deflects the flow stream that originally passed through the mesh holes, thus serving to divide and stabilize the flow.

[0039] Specifically, when the medium flows along the fluid channel through the valve plate 4, it first encounters the guide plate 5 and passes through its mesh aperture. Due to the aperture array distribution, the originally concentrated water flow is divided into multiple small streams; these streams are guided and dispersed again after encountering the diversion column 51 in the intersection and confluence area, so that the fluid has been effectively decomposed and its direction changed when it enters the valve cavity. This guiding and diversion structure significantly weakens the impact force of the fluid during the closing or opening of the valve plate 4.

[0040] Based on the structure of the guide plate 5 and the flow divider 51, their role in mitigating water hammer can be further explained. Water hammer refers to the pressure wave generated by the sudden change in liquid momentum when fluid in a pipeline suddenly stops or a valve is quickly closed. Since liquids are almost incompressible, the momentum of the stopped fluid will propagate in the pipeline in the form of shock waves, and this pressure peak is enough to damage pipelines and valves. Common engineering methods are to reduce the flow velocity or extend the closing time to make the momentum change more slow, thereby weakening the impact. In this invention, the multiple grid apertures on the guide plate 5 divide the overall flow into multiple smaller flow streams, which, together with the flow divider 51 at the intersection and confluence, further disperse and deflect the flow direction, thus effectively reducing the flow velocity of each stream; at the same time, the flow divider 51 extends along the direction of the fluid channel, which is equivalent to increasing the guiding length within the grid apertures, so that the fluid needs more time to be completely cut off when passing through the valve body. This "velocity reduction-delay" flow characteristic helps to mitigate the pressure change at the moment of closure, thereby reducing the water hammer effect. This optimized design reduces the impact of water hammer on the sealing ring and valve plate 4, reduces sealing failure and structural damage caused by water hammer, and improves the overall stability and service life of the valve.

[0041] In some embodiments, the diversion column 51 is provided with a guide groove for guiding local fluid flow around it.

[0042] It is understandable that this section emphasizes the guide groove structure provided on the flow divider 51. This is a groove machined on the surface of the flow divider 51 to further improve the fluid guiding effect. The guide groove refers to the groove machined along the outer wall of the flow divider 51, which can be axial or spiral and penetrates the surface of the flow divider 51. Its function is to provide a flow path for local fluid, so that the fluid forms a flow around or swirling flow near the flow divider 51.

[0043] Specifically, when fluid passes through the mesh apertures on the guide plate 5, it partially impacts the diversion column 51 located at the mesh intersection. The guide grooves on the surface of the diversion column 51 provide a bypass path for this fluid, guiding the local fluid to flow around the column along the groove direction or generating swirling flow. This bypass flow increases the flow path length of the local fluid and reduces the flow velocity, making the momentum change more gradual. The reduced flow velocity helps mitigate the water hammer effect generated at the moment of valve closure, as water hammer typically originates from the pressure wave generated when fluid momentum is rapidly interrupted; reducing the flow velocity or extending the fluid stopping time can significantly weaken the water hammer impact.

[0044] In some embodiments, the valve body assembly 1 further includes a handwheel 2, which is fixedly connected to the valve stem 3 and is used to drive the valve stem 3 to rotate around the axis of the valve stem 3.

[0045] It can be understood that handwheel 2 refers to a disc-shaped knob installed on the outside of valve body assembly 1, with its center fixedly connected to the upper end of valve stem 3. Handwheel 2 is generally rigidly connected to valve stem 3 by means of key or thread, and rotating handwheel 2 can directly transmit torque to valve stem 3, causing valve stem 3 to rotate around its own axis.

[0046] Specifically, the operator controls the opening and closing of the gate valve using handwheel 2. When handwheel 2 is turned, valve stem 3 rotates accordingly. Since the lower end of valve stem 3 and the gate plate achieve rotational-linear motion conversion through threads and guide structures, the rotation of valve stem 3 is converted into the axial lifting and lowering of valve plate 4, thereby realizing the opening and closing of the gate valve.

[0047] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A wedge gate valve that is resistant to water hammer, characterized by, include: Valve body assembly (1), wherein a valve plate (4) space is provided on the valve body assembly (1); Valve plate (4), the valve plate (4) is movably disposed in the space of the valve plate (4), and an annular groove (61) is provided on the side of the valve plate (4) away from the space of the valve plate (4). The valve stem (3) is rotatable about its own axis and movable along its own axis in the space of the valve plate (4); The sealing ring (6) is snapped into the annular groove (61) of the valve plate (4); The valve body assembly (1) has a fluid channel, and a guide plate (5) is provided on the inner wall of the fluid channel. The guide plate (5) is located on both sides of the space of the valve plate (4) and is connected to the fluid channel and the space of the valve plate (4).

2. The wedge gate valve for preventing water hammer according to claim 1, characterized in that, The lower end of the valve stem (3) is provided with an annular locking block (31). The valve plate (4) is composed of two plates joined together. The annular locking block (31) of the valve stem (3) is rotatably locked between the two valve plates (4). When the valve stem (3) rotates, it drives the valve plate (4) to move in the space of the valve plate (4) along its axial direction.

3. A wedge gate valve for preventing water hammer according to claim 1 or 2, characterized in that, The sealing ring (6) is provided with an annular groove (61) communicating with its inner wall, and the valve plate (4) is provided with an annular protrusion (21) corresponding to it. The sealing ring (6) is fixed by the annular groove and the protrusion on the valve plate (4). The sealing surface of the valve plate (4) is inclined, and the outer edge of the sealing ring (6) is arc-shaped or has a deformable structure. When the valve plate (4) is closed, the sealing ring (6) is compressed and deformed along the inclined sealing surface direction, and fits against the channel wall of the valve body assembly (1).

4. A wedge gate valve for preventing water hammer according to claim 1 or 2, characterized in that, The guide plate (5) is fixed on the side of the valve body away from the valve plate (4). The guide plate (5) has multiple grid apertures. A diversion column (51) is provided in the area where the grid apertures intersect and merge. The diversion column (51) extends along the direction of the fluid channel.

5. A wedge gate valve for preventing water hammer according to claim 4, characterized in that, The diversion column (51) is provided with a guide groove for guiding local fluid flow around it.

6. A wedge gate valve for preventing water hammer according to claim 1 or 2, characterized in that, The valve body assembly (1) also includes a handwheel (2), which is fixedly connected to the valve stem (3) and is used to drive the valve stem (3) to rotate around the axis of the valve stem (3).

Images