Drainage pressure relief control butterfly valve

Abstract

The utility model discloses a drainage pressure relief control butterfly valve which comprises a valve body, a valve rod and a butterfly plate, and the butterfly plate is driven by the valve rod to rotate relative to the valve body to achieve opening and closing of the butterfly valve. The sealing plate surface of the butterfly plate is provided with a drainage inclined surface, so that the thickness of the sealing plate surface is gradually reduced from the center to the edge of the butterfly plate, and the inner wall of the valve cavity of the valve body is provided with a pressure relief hole positioned on the sealing plate surface side; and in a valve closing state, a fluid medium impacting the sealing plate surface is drained to the sealing edge through the drainage inclined surface and enters the pressure relief hole. Drainage and pressure relief are carried out through the drainage slope and the pressure relief hole in the valve closing transient state, the impact of fluid media on the butterfly plate in the valve closing transient state is reduced, and the stability and safety of the butterfly valve are improved.

Description

Technical Field

[0001] This utility model belongs to the field of butterfly valve pressure relief technology, and in particular relates to a flow-draining and pressure-relief control butterfly valve. Background Technology

[0002] In industrial fluid control systems, butterfly valves are widely used for controlling various fluid media due to their simple structure, small size, light weight, and ease of operation. However, during the instantaneous closing of the valve, the fluid medium still has a significant impact force due to its previous flow state. This impact force can cause damage to the butterfly plate. Traditional butterfly valves lack effective pressure relief and flow diversion measures, and the butterfly plate bears a large impact force from the fluid medium during rapid closing, posing potential risks to the stability and safety of the butterfly valve. Utility Model Content

[0003] Purpose of the invention: In order to overcome the shortcomings of the existing technology, this utility model provides a flow-draining and pressure-relief control butterfly valve, which uses a flow-draining inclined surface and a pressure-relief hole to drain and relieve pressure during the instant of valve closure, thereby reducing the impact of the fluid medium on the butterfly plate during valve closure and improving the stability and safety of the butterfly valve.

[0004] Technical solution: To achieve the above objectives, this utility model provides a flow-relief control butterfly valve, comprising a valve body, a valve stem, and a butterfly plate. The butterfly plate rotates relative to the valve body via the valve stem to achieve the opening and closing of the butterfly valve.

[0005] The sealing plate of the butterfly plate has a flow-guiding slope, so that the thickness of the sealing plate gradually decreases from the center of the butterfly plate to the edge. The valve cavity inner wall of the valve body is provided with a pressure relief hole located on the side of the sealing plate. When the valve is closed, the fluid medium impacting the sealing plate is guided to the sealing edge through the flow-guiding slope and enters the pressure relief hole.

[0006] Furthermore, the drainage slopes are symmetrically arranged on the sealing plate surface of the butterfly plate with the valve stem as the dividing line, forming a double-sided drainage slope structure.

[0007] Furthermore, the pressure relief hole is located near the sealing edge of the butterfly plate.

[0008] Furthermore, the valve body has multiple pressure relief holes on the inner wall of the valve cavity, and the multiple pressure relief holes are distributed in a circumferential array along the arc-shaped contour of the inner wall of the valve cavity.

[0009] Furthermore, a pressure relief plug is slidably disposed inside the pressure relief hole, a sealing plug is installed at the tail of the pressure relief hole, and a pressure relief spring is connected between the pressure relief plug and the sealing plug. The pressure relief plug is elastically disposed inside the pressure relief hole by means of the pressure relief spring connected to the sealing plug.

[0010] Furthermore, the tail end of the pressure relief hole is coaxially provided with a threaded hole, and the sealing plug is screwed into the threaded hole to compress the sealing ring thereon for sealing installation.

[0011] Beneficial effects: This utility model achieves effective fluid medium pressure relief control by diverting and relieving pressure through the flow-diverting inclined surface and pressure relief hole during the instant of valve closure. It reduces the impact of the fluid medium on the butterfly plate during valve closure, reduces the pressure concentration of the fluid medium on the sealing surface, and releases pressure through the pressure relief hole after the fluid medium impacts the butterfly plate, thereby improving the stability, reliability and safety of the butterfly valve. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the valve body and butterfly plate of the butterfly valve of this utility model;

[0013] Figure 2 for Figure 1 A schematic diagram of the half-section structure. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings.

[0015] like Figure 1 and Figure 2 As shown, a flow-draining and pressure-relief control butterfly valve includes a valve body 1, a valve stem 2, and a butterfly plate 3. The butterfly plate 3 is rotated relative to the valve body 1 by the valve stem 2 to open and close the butterfly valve. The sealing surface of the butterfly plate 3 has a flow-draining slope 4, which gradually reduces the thickness of the sealing surface from the center to the edge of the butterfly plate 3. The valve cavity inner wall of the valve body 1 is provided with a pressure relief hole 5 located on the sealing surface side. In the closed state, the fluid medium impacting the sealing surface is diverted to the sealing edge through the flow-draining slope 1 and enters the pressure relief hole 5. This utility model achieves effective fluid medium pressure relief control by diverting and relieving pressure through the flow-draining slope 4 and the pressure relief hole 5 during the instantaneous valve closure. This reduces the impact of the fluid medium on the butterfly plate 3 during the instantaneous valve closure, reduces the pressure concentration of the fluid medium on the sealing surface, and releases pressure through the pressure relief hole 5 after impacting the butterfly plate 3, thereby reducing the impact on the butterfly plate 3 and improving the stability and safety of the butterfly valve.

[0016] More specifically, the flow-guiding inclined surface 4 is symmetrically arranged on the sealing plate surface of the butterfly plate 3 with the valve stem 2 as the boundary, forming a double-sided flow-guiding inclined surface structure, which enhances the flow-guiding effect of the fluid medium. The pressure relief hole 5 is located close to the sealing edge of the butterfly plate 3, so that the fluid medium can quickly enter the pressure relief hole 5, improving the pressure relief efficiency. The valve cavity inner wall of the valve body 1 has multiple pressure relief holes 5, which are distributed in a circumferential array along the arc-shaped contour of the valve cavity inner wall, thereby making the pressure relief more uniform.

[0017] like Figure 1 and Figure 2As shown, a pressure relief plug 6 is slidably disposed inside the pressure relief hole 5, and a sealing plug 7 is installed at the tail of the pressure relief hole 5. A pressure relief spring 8 is connected between the pressure relief plug 6 and the sealing plug 7. The pressure relief plug 6 is elastically slidably disposed inside the pressure relief hole 5 through the pressure relief spring 8 connected to the sealing plug 7. Through the structural design of the pressure relief plug 6 and the pressure relief spring 8, the pressure relief has automatic control capability, enabling the butterfly valve to adapt to different pressure conditions.

[0018] The tail end of the pressure relief hole 5 is coaxially provided with a threaded hole 9. The sealing plug 7 is screwed into the threaded hole 9 to compress the sealing ring 10 on it for sealing and installation, thereby improving the sealing performance.

[0019] This invention utilizes the flow-guiding slope of the butterfly plate and the pressure relief hole design of the valve body to guide flow and relieve pressure during the instantaneous valve closure, effectively reducing the impact of the fluid medium on the butterfly plate and improving the stability and safety of the butterfly valve. The double-sided flow-guiding slope structure and the distribution of multiple pressure relief holes further enhance the flow-guiding and pressure-relieving effects.

[0020] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A drain and pressure relief control butterfly valve, comprising a valve body (1), a valve stem (2) and a butterfly plate (3), wherein the butterfly plate (3) rotates relative to the valve body (1) through the valve stem (2) to realize the opening and closing of the butterfly valve; Its features are: The sealing plate surface of the butterfly plate (3) has a flow-guiding slope (4), so that the thickness of the sealing plate surface gradually decreases from the center of the butterfly plate (3) to the edge. The valve cavity inner wall of the valve body (1) is provided with a pressure relief hole (5) located on the side of the sealing plate surface. When the valve is closed, the fluid medium impacting the sealing plate surface is guided to the sealing edge through the flow-guiding slope and enters the pressure relief hole (5).

2. The draining and pressure relief control butterfly valve according to claim 1, characterized in that: The drainage slope (4) is symmetrically arranged on the sealing plate surface of the butterfly plate (3) with the valve stem (2) as the boundary, forming a double-sided drainage slope structure.

3. The draining and pressure relief control butterfly valve according to claim 2, characterized in that: The pressure relief hole (5) is located near the sealing edge of the butterfly plate (3).

4. The draining and pressure relief control butterfly valve according to claim 3, characterized in that: The valve body (1) has multiple pressure relief holes (5) on the inner wall of the valve cavity, and the multiple pressure relief holes (5) are distributed in a circular array along the arc-shaped contour of the inner wall of the valve cavity.

5. A draining and pressure-relief control butterfly valve according to claim 4, characterized in that: A pressure relief plug (6) is slidably disposed inside the pressure relief hole (5), and a sealing plug (7) is installed at the tail of the pressure relief hole (5). A pressure relief spring (8) is connected between the pressure relief plug (6) and the sealing plug (7). The pressure relief plug (6) is elastically slidably disposed inside the pressure relief hole (5) by means of the pressure relief spring (8) connected to the sealing plug (7).

6. A draining and pressure-relief control butterfly valve according to claim 5, characterized in that: The tail of the pressure relief hole (5) is coaxially provided with a threaded hole (9), and the sealing plug (7) is screwed into the threaded hole (9) to compress the sealing ring (10) on it for sealing installation.

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