Check valve

Abstract

A check valve comprises a valve body and a valve cover, a valve cavity is formed in the valve body, an opening communicated with the valve cavity is formed in the top end of the valve body, the valve cover is arranged at the top end of the valve body, one end of the valve cover extends into the valve cavity to be connected with the valve body, and the end face of the side, close to the valve body, of the valve cover is provided with an outer ring part and an inner ring part. The inner ring side and the outer ring side of the valve cover can be effectively sealed with the valve body, so that the contact area between the valve cover and the valve body is increased, and the sealing performance is improved. The sealing ring between the inner boss and the outer boss can effectively block leakage of media.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve technical field, concretely relates to a check valve. BACKGROUND

[0002] In prior art, the valve body and the valve cover of the check valve are usually connected by threads or welded, but these methods cannot provide enough sealing performance under the working conditions of high temperature, high pressure or corrosive medium, and are prone to leakage. In addition, the traditional sealing structure is easy to be damaged during disassembly and assembly, and the maintenance cost is high. Therefore, a high sealing valve cover sealing structure is urgently needed. SUMMARY

[0003] Therefore, the utility model provides a check valve.

[0004] To achieve the above object, the utility model provides the following technical scheme:

[0005] A check valve, comprising a valve body and a valve cover, a valve cavity is formed in the valve body, an opening communicating with the valve cavity is arranged at the top end of the valve body, the valve cover is arranged at the top end of the valve body, one end of the valve cover extends into the valve cavity and is connected with the valve body, the side end face of the valve cover close to the valve body has an outer ring part and an inner ring part, the outer ring part and the inner ring part respectively protrude towards the valve body to form an outer boss and an inner boss, the inner boss is arranged in a stepped manner, an annular sealing groove is formed between the inner boss and the outer boss, a sealing ring is arranged in the annular sealing groove, the upper part of the sealing ring extends into the annular sealing groove and is in sealing connection with the valve cover, a lower sealing groove corresponding to the annular sealing groove is arranged on the valve body, and the lower part of the sealing ring extends into the lower sealing groove and is in sealing connection with the valve body.

[0006] Preferably, the inner boss has a first stepped surface and a second stepped surface, a stepped part corresponding to the inner boss is arranged on the valve body, an inner sealing gasket is arranged on the position corresponding to the first stepped surface of the stepped part, the inner sealing gasket is in sealing connection with the first stepped surface and the stepped part respectively, the stepped part has a height H, and the vertical distance between the top groove wall of the annular sealing groove and the first stepped surface is the same as the height H of the stepped part.

[0007] Preferably, after the first stepped surface presses the inner sealing gasket, the side of the first stepped surface is in connection with the side wall of the stepped part.

[0008] Preferably, the outer boss is provided with an upper wave pattern on the side end face close to the valve body, the valve body is provided with a lower wave pattern corresponding to the outer boss, and the upper wave pattern and the lower wave pattern are in concave-convex cooperation.

[0009] Preferably, the material of the sealing ring is nitrile rubber.

[0010] Preferably, the material of the inner sealing gasket is graphite.

[0011] Preferably, fastening bolts are provided between the valve cover and the valve body, and the valve cover and the valve body are connected and fixed by the fastening bolts.

[0012] The beneficial effect of the present invention is that by providing an outer boss and an inner boss on the outer ring portion and the inner ring portion, respectively, both the inner and outer ring sides of the valve cover can form an effective seal with the valve body, thereby increasing the contact area between the valve cover and the valve body and improving the sealing performance. The sealing ring between the inner and outer bosses can effectively prevent leakage of the medium. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0014] Attachment Figure 1 This is a schematic diagram of the structure of the utility model;

[0015] Attachment Figure 2 For attachment Figure 1 Enlarged view of point A in the middle. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0017] The present invention will be further described below with reference to the accompanying drawings.

[0018] The utility model provides the following technical solutions:

[0019] As attached Figure 1-2As shown, the utility model discloses a check valve, including a valve body 1 and a valve cover 2, a valve cavity 3 is formed in the valve body 1, and an opening communicating with the valve cavity 3 is provided at the top of the valve body 1, the valve cover 2 is arranged at the top of the valve body 1, one end of the valve cover 2 extends into the valve cavity 3 and is connected with the valve body 1, and the end face of the valve cover 2 close to the valve body 1 has an outer ring portion 4 and an inner ring portion 5, the outer ring portion 4 and the inner ring portion 5 protrude toward the valve body 1 to form an outer boss 6 and an inner boss 7, respectively, the inner boss 7 is arranged in a stepped shape, and an annular sealing groove 8 is formed between the inner boss 7 and the outer boss 6, a sealing ring 9 is arranged in the annular sealing groove 8, the upper part of the sealing ring 9 extends into the annular sealing groove 8 and is sealed with the valve cover 2, a lower sealing groove 10 corresponding to the annular sealing groove 8 is provided on the valve body 1, and the lower part of the sealing ring 9 extends into the lower sealing groove 10 and is sealed with the valve body 1. Specifically, in this design, by providing an outer boss 6 and an inner boss 7 on the outer ring portion 4 and inner ring portion 5, respectively, both the inner and outer ring sides of the valve cover 2 can form an effective seal with the valve body 1, thereby increasing the contact area between the valve cover 2 and the valve body 1 and improving sealing performance. The sealing ring 9 between the inner boss 7 and the outer boss 6 can effectively prevent leakage of the medium.

[0020] Furthermore, the inner boss 7 has a primary stepped surface 11 and a secondary stepped surface 12. The valve body 1 is provided with a stepped portion 13 corresponding to the inner boss 7. An inner sealing gasket 14 is provided at a position on the stepped portion 13 corresponding to the primary stepped surface 11. The inner sealing gasket 14 is sealedly connected to the primary stepped surface 11 and the stepped portion 13, respectively. The stepped portion 13 has a height H, and the vertical distance between the top groove wall of the annular sealing groove 8 and the primary stepped surface 11 is the same as the height H of the stepped portion 13. Specifically, in this embodiment, the provision of the inner sealing gasket 14 further enhances the sealing effect between the valve cover 2 and the valve body 1. The inner sealing gasket 14 is located between the primary stepped surface 11 and the secondary stepped surface 12, and is tightly fitted to the stepped portion 13 of the valve body 1, ensuring the sealing of the medium at the connection between the valve cover 2 and the valve body 1. The provision of the inner sealing gasket 14 not only improves sealing performance but also, to a certain extent, increases the contact area between the valve cover 2 and the valve body 1, thereby enhancing the overall sealing effect. Furthermore, the vertical distance between the top wall of the annular sealing groove 8 and the primary stepped surface 11 is the same as the height H of the stepped portion 13. This design ensures that a continuous sealing surface is formed between the sealing ring 9 and the inner sealing gasket 14, effectively preventing leakage of the medium in the gap between the sealing ring 9 and the inner sealing gasket 14. This structural design ensures that the sealing performance between the valve cover 2 and the valve body 1 remains reliable even in the presence of high pressure or corrosive media.

[0021] Furthermore, after the primary stepped surface 11 compresses the inner sealing gasket 14, one side of the primary stepped surface 11 contacts the sidewall of the stepped portion 13. Specifically, in this embodiment, the tight fit between the primary stepped surface 11 and the sidewall of the stepped portion 13 further enhances the sealing effect. This contact between the primary stepped surface 11 and the sidewall of the stepped portion 13 not only provides additional mechanical support but also helps distribute the sealing pressure, reducing localized stress concentration and thereby extending the service life of the seal.

[0022] Furthermore, an upper corrugation 15 is provided on the end face of the outer boss 6 adjacent to the valve body 1, and a lower corrugation 16 is provided on the valve body 1 corresponding to the outer boss 6. The upper corrugation 15 and the lower corrugation 16 are matched with each other in a concave-convex manner. Specifically, in this embodiment, the sealing performance between the valve cover 2 and the valve body 1 can be further improved by the design of this corrugation. The concave-convex matching of the upper corrugation 15 and the lower corrugation 16 not only increases the contact area, but also forms multiple tiny sealing areas at the contact points between the crests and troughs. This structural design makes the seal more uniform, effectively disperses the sealing pressure, and reduces the risk of seal damage caused by pressure concentration.

[0023] Furthermore, the sealing ring 9 is made of nitrile rubber.

[0024] Furthermore, the inner sealing gasket 14 is made of graphite.

[0025] Furthermore, a fastening bolt 17 is provided between the valve cover 2 and the valve body 1 , and the valve cover 2 and the valve body 1 are connected and fixed by the fastening bolt 17 .

[0026] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A check valve, comprising a valve body and a valve cover, characterized in that: A valve cavity is formed in the valve body, an opening communicating with the valve cavity is provided at the top of the valve body, the valve cover is arranged at the top of the valve body, one end of the valve cover extends into the valve cavity and is connected to the valve body, and the end face of the valve cover close to the valve body has an outer ring portion and an inner ring portion, the outer ring portion and the inner ring portion protrude toward the valve body to form an outer boss and an inner boss respectively, the inner boss is arranged in a stepped shape, an annular sealing groove is formed between the inner boss and the outer boss, a sealing ring is arranged in the annular sealing groove, the upper part of the sealing ring extends into the annular sealing groove and is sealed with the valve cover, a lower sealing groove corresponding to the annular sealing groove is provided on the valve body, the lower part of the sealing ring extends into the lower sealing groove and is sealed with the valve body.

2. The check valve according to claim 1, characterized in that: The inner boss has a primary step surface and a secondary step surface. A step portion corresponding to the inner boss is provided on the valve body. An inner sealing gasket is provided at a position of the step portion corresponding to the primary step surface. The inner sealing gasket is sealed with the primary step surface and the step portion respectively. The step portion has a height H. The vertical distance between the top groove wall of the annular sealing groove and the primary step surface is the same as the height H of the step portion.

3. The check valve according to claim 2, characterized in that: After the primary stepped surface compresses the inner sealing gasket, one side of the primary stepped surface is in contact with the side wall of the stepped portion.

4. The check valve according to claim 1, wherein: An upper wave pattern is provided on an end surface of the outer boss close to the valve body, and a lower wave pattern is provided on the valve body corresponding to the outer boss, and the upper wave pattern and the lower wave pattern are matched with each other in a concave-convex manner.

5. The check valve according to claim 1, characterized in that: The sealing ring is made of nitrile rubber.

6. The check valve according to claim 2, characterized in that: The inner sealing gasket is made of graphite.

7. The check valve according to claim 1, characterized in that: Fastening bolts are provided between the valve cover and the valve body, and the valve cover and the valve body are connected and fixed by the fastening bolts.

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