An erosion-proof valve structure

Abstract

The present application belongs to the technical field of valve, and particularly relates to an anti-erosion valve structure. The present application comprises a valve rod, a valve clapper and a valve body, the valve rod is fixedly connected with the upper end of the valve clapper to drive the vertical movement of the valve clapper, the valve body is internally provided with a stepped hole, and the lower end of the valve clapper is connected with the valve body. The present application avoids the generation of rapid initial flow between the valve clapper and the valve seat sealing surface when the valve is opened and the generation of high-pressure flow when the valve is closed, and thus avoids the erosion damage of the medium to the sealing surface.

Description

Technical Field

[0001] This invention belongs to the field of valve technology, and specifically relates to a valve structure for erosion prevention. Background Technology

[0002] Gate valves are widely used in petroleum, chemical, and power plants, but in actual use, they have a short lifespan. Common problems include erosion damage to the valve disc, valve seat sealing surface, and valve disc surface, resulting in internal leakage. This poses a threat to normal safe production and requires frequent maintenance or replacement, leading to significant waste and increased costs. Summary of the Invention

[0003] The technical problem solved by this invention is to provide a valve structure that prevents erosion, effectively avoiding the occurrence of erosion.

[0004] The technical solution adopted in this invention is as follows: An anti-erosion valve structure includes a valve stem, a valve disc, and a valve body. The valve stem is fixedly connected to the upper end of the valve disc, driving the valve disc to move vertically. The valve body has a stepped hole inside, and the lower end of the valve disc is connected to the valve body.

[0005] The lower part of the valve disc has a T-shaped structure, with the upper end of the T-shaped structure being a flow-blocking step and the lower end being a smooth curved surface. The flow-blocking step and the smooth curved surface are smoothly connected.

[0006] The smooth curved surface includes a conical surface and a spherical surface. The lower end face of the intercepting step is smoothly connected to the conical surface through a first arc surface, and the conical surface is smoothly connected to the bottom spherical surface through a second arc surface.

[0007] The stepped orifice of the valve body consists of a large-diameter flow-blocking socket and a small-diameter flow channel hole.

[0008] The flow-blocking step mates with the flow-blocking socket, and the top of the flow channel hole is provided with an inverted conical valve seat sealing surface, which mates with the conical surface.

[0009] When the throttling step enters the throttling socket to throttle the medium, there is a gap between the valve disc sealing surface and the valve seat sealing surface.

[0010] When the throttling step leaves the throttling support and the medium is in a throttling state, there is a gap between the valve disc sealing surface and the valve seat sealing surface.

[0011] The beneficial effects of this invention are as follows: (1) The erosion-resistant valve structure provided by the present invention has a flow-blocking step and a flow-blocking socket, which avoids the rapid initial flow between the valve disc and the valve seat sealing surface when the valve is opened and the high pressure flow when the valve is closed, thus avoiding the erosion damage of the sealing surface by the medium. (2) The present invention provides an anti-erosion valve structure. The smooth curved surface of the valve disc effectively disperses the impact force, changes the impact nature of the medium particles on the valve disc, avoids erosion damage, and has a simple and practical structure. Attached Figure Description

[0012] To more clearly illustrate the embodiments of the present invention, the accompanying drawings used in describing the embodiments of the present invention will be briefly described below. Obviously, the drawings described below are merely some embodiments recorded in the present invention. Those skilled in the art can derive other drawings from the following drawings without any creative effort.

[0013] Figure 1 A schematic diagram of an anti-erosion valve structure provided by the present invention; Figure 2 This is a schematic diagram of the valve disc; Figure 3 This is a schematic diagram of the valve body.

[0014] In the figure: 1. Valve stem, 2. Valve disc, 3. Valve body, 4. Gap, 21. Spherical surface, 22. Second arc surface, 23. Conical surface (sealing surface), 24. First arc surface, 25. Flow-stopping step, 31. Flow-stopping socket, 32. Valve seat sealing surface. Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0016] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., refer to the orientation or positional relationship shown in the accompanying drawings, and are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0017] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or a connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0018] like Figure 1 As shown, the present invention provides an anti-erosion valve structure, including a valve stem 1, a valve disc 2, and a valve body 3. The valve stem 1 is fixedly connected to the upper end of the valve disc 2, driving the valve disc 2 to move vertically. The valve body 3 has a stepped hole inside. The lower end of the valve disc 2 is connected to the valve body 3. The closure of the internal channel of the valve body 3 is achieved through the relative movement between the valve disc 2 and the valve body 3. like Figure 2 As shown, the lower part of the valve disc 2 is a T-shaped structure, the upper end of the T-shaped structure is a flow-blocking step 25, and the lower end is a smooth curved surface. The flow-blocking step 25 is smoothly connected to the smooth curved surface. The smooth curved surface includes a conical surface 23 and a spherical surface 21. The lower end face of the intercepting step 25 is smoothly connected to the conical surface 23 through a first arc surface 24. The conical surface 23 is smoothly connected to the bottom spherical surface 21 through a second arc surface 22. like Figure 3 As shown, the stepped hole of the valve body 3 is composed of a large-diameter flow-blocking socket 31 and a small-diameter flow channel hole. The flow-blocking step 25 cooperates with the flow-blocking socket 31. The top of the flow channel hole is provided with an inverted conical valve seat sealing surface 32, which cooperates with the conical surface 23.

[0019] During valve closing, the flow-blocking step 25 on valve disc 2 first enters the flow-blocking socket 31 on valve body 3, blocking the medium flow. At this time, there is a gap 4 between valve disc sealing surface 23 and valve seat sealing surface 32. The gap 4 can prevent high-pressure flow from being generated between valve disc sealing surface 23 and valve seat sealing surface 32, thus preventing the medium from causing erosion damage to valve disc sealing surface 23 and valve seat sealing surface 32. During valve opening, when the flow-blocking step 25 completely leaves the flow-blocking socket 31, the medium is in a blocked state. At this time, the gap 4 between valve disc sealing surface 23 and valve seat sealing surface 32 has been moved away, preventing rapid initial flow from being generated between valve disc and valve disc sealing surface 23 and valve seat sealing surface 32 when the valve is opened, thus preventing erosion damage to valve disc sealing surface 23 and valve seat sealing surface 32. The smooth curved surface effectively disperses the impact force of the medium, changing the impact nature of the medium particles on the surface of valve disc 2 from impact cutting to rolling friction, thus avoiding erosion damage to the surface of valve disc 2.

[0020] Further explanation is needed: Erosion damage is essentially a process in which a solid surface is subjected to mechanical impact from a high-speed fluid or a fluid containing particles, leading to the gradual loss of material. High-speed particles cut the material surface like micro-knives, or impact it, causing plastic deformation and micro-cracks. Repeated impacts cause the surface material to harden, eventually peeling off due to fatigue.

[0021] The optimal surface shape for erosion resistance is circular / spherical. When particles impact a circular / spherical surface at any angle, the smooth surface can deflect the particles tangentially, effectively dispersing the impact force and dissipating the energy through rolling friction rather than cutting.

[0022] While those skilled in the art will recognize that the present 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 the invention, the embodiments should be considered illustrative and non-limiting in all respects. The scope of the invention is defined by the appended claims rather than the foregoing description, and therefore all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0023] Furthermore, it should be understood that although the present invention is described according to embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. 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 valve structure for erosion protection, characterized in that, It includes a valve stem (1), a valve disc (2) and a valve body (3). The valve stem (1) is fixedly connected to the upper end of the valve disc (2) to drive the valve disc (2) to move vertically. The valve body (3) has a stepped hole inside. The lower end of the valve disc (2) is connected to the valve body (3).

2. The erosion-resistant valve structure according to claim 1, characterized in that, The lower part of the valve disc (2) is a T-shaped structure. The upper end of the T-shaped structure is a flow-blocking step (25), and the lower end is a smooth curved surface. The flow-blocking step (25) is smoothly connected to the smooth curved surface.

3. The erosion-resistant valve structure according to claim 2, characterized in that, The smooth curved surface includes a conical surface (23) and a spherical surface (21). The lower end face of the intercepting step (25) is smoothly connected to the conical surface (23) through a first arc surface (24). The conical surface (23) is smoothly connected to the bottom spherical surface (21) through a second arc surface (22).

4. The erosion-resistant valve structure according to claim 3, characterized in that, The stepped hole of the valve body (3) is composed of a large-diameter flow-blocking socket (31) and a small-diameter flow channel hole.

5. The erosion-resistant valve structure according to claim 4, characterized in that, The flow-blocking step (25) cooperates with the flow-blocking socket (31), and the top of the flow channel hole is provided with an inverted conical valve seat sealing surface (32), which cooperates with the conical surface (23).

6. The erosion-resistant valve structure according to claim 5, characterized in that, When the throttling step (25) enters the throttling socket (31) to throttle the medium, there is a gap (4) between the valve disc sealing surface (23) and the valve seat sealing surface (32).

7. The erosion-resistant valve structure according to claim 6, characterized in that, When the throttling step (25) leaves the throttling socket (31) and the medium is in a throttling state, there is a gap (4) between the valve disc sealing surface (23) and the valve seat sealing surface (32).

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