Large-diameter swing check valve soft sealing valve seat structure and large-diameter swing check valve

Abstract

The large-caliber swing check valve soft-sealed valve seat structure and the large-caliber swing check valve include a valve seat and a valve disc, the valve seat includes a first mounting groove, the first mounting groove is arranged on the sealing surface of the valve seat and the valve disc; the sealing member is arranged in the first mounting groove, the sealing member and the first mounting groove are interference-fitted, the upper end surface of the sealing member is flush with the sealing surface of the valve seat, and the valve seat is matched with the valve disc through the surface seal between the sealing member and the valve disc. The utility model embeds the sealing member on the valve seat, and the sealing member is not eroded by the medium, which well avoids damage and falling off caused by the erosion of the medium, and achieves a better sealing effect and is more reliable. The sealing surface between the sealing member and the valve disc is a surface seal, which increases the effective sealing surface width to a certain extent, and can effectively avoid the phenomenon that the valve is not tightly closed when the medium pressure becomes smaller. The unique innovation point is that the valve seat is tightly fixed to the valve body through a certain number of fasteners, which is convenient for disassembly and assembly.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a soft sealing valve seat structure of a large-diameter swing check valve and a large-diameter swing check valve. Background Art

[0002] In the conventional swing check valve soft sealing seat structure, such as Figure 3 As shown in the figure, the valve is sealed by the O-ring embedded in the valve disc. When the valve is in a fully closed state, the medium pressure presses the valve disc against the valve seat, so that the O-ring and the valve seat fit together to form a seal. The valve seat and the valve body are sealed by tightening the threads, and the valve seat 2 is removable.

[0003] However, under some special working conditions, due to the erosion of the medium, the O-ring directly embedded in the valve disc is easy to fall off, resulting in the valve being unable to seal. The effective sealing surface of the O-ring is narrow, and the valve seat seal is close to a linear seal. When the medium pressure is extremely low, the narrow sealing surface will cause the valve to not close tightly, resulting in leakage. In this structure, the valve seat is screwed into the valve seat hole of the valve body through a thread. Large-diameter valves, especially valves over 24 inches, are difficult to tighten and achieve sealing between the valve body and the valve seat, which greatly increases the difficulty of assembly and is also difficult to disassemble. Utility Model Content

[0004] In order to solve the technical defects in the prior art, the utility model provides a soft sealing valve seat structure of a large-diameter swing check valve and a large-diameter swing check valve.

[0005] The technical solution adopted by the utility model is: a large-caliber swing check valve soft sealing valve seat structure, including a valve seat and a valve disc, the valve seat includes:

[0006] A first mounting groove, wherein the first mounting groove is arranged on the sealing surface between the valve seat and the valve disc;

[0007] The sealing member is arranged in the first installation groove, the sealing member and the first installation groove are interference fit, the upper end surface of the sealing member is flush with the sealing surface of the valve seat, and the valve seat is sealed with the valve disc through the sealing member.

[0008] The valve seat is also provided with a second mounting groove, and the valve seat is fixedly mounted on the valve body through the second mounting groove and a fastener.

[0009] An O-ring and fireproof graphite are also provided on the outer circle of the valve seat. The O-ring and fireproof graphite are located between the valve seat and the valve body to achieve sealing and fireproofing functions between the valve seat and the valve body.

[0010] The sealing element is a PTFE or RPTFE sealing ring.

[0011] The second mounting groove is arranged at the rear end of the valve seat, and a fastener is installed in the second mounting groove to tightly fix the valve seat on the valve body.

[0012] A large-caliber swing check valve comprises a valve body, wherein the valve body is provided with the soft sealing valve seat structure.

[0013] The beneficial effects of the utility model are as follows: the utility model provides a large-caliber swing check valve soft-sealed valve seat structure and a large-caliber swing check valve, including a valve seat and a valve disc, the valve seat includes a first mounting groove, the first mounting groove is arranged on the sealing surface of the valve seat and the valve disc; the sealing member is arranged in the first mounting groove, the sealing member and the first mounting groove are interference-fitted, the upper end surface of the sealing member is flush with the sealing surface of the valve seat, the valve seat is matched with the surface seal between the sealing member and the valve disc, the utility model embeds the sealing member on the valve seat, the sealing member is not eroded by the medium, and the damage and falling off caused by the erosion of the medium are well avoided, and a better sealing effect is achieved, which is more reliable, and the sealing surface between the sealing member and the valve disc is a surface seal, which increases the effective sealing surface width to a certain extent, and can effectively avoid the phenomenon that the valve is not tightly closed when the medium pressure becomes smaller. The unique innovation point is that the valve seat is tightly fixed to the valve body by a certain number of fasteners, which is convenient for disassembly and assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the soft sealing valve seat structure of the utility model.

[0015] Figure 2 The utility model is a schematic diagram of the structure of a large-diameter swing check valve.

[0016] Figure 3 This is a schematic diagram of the soft sealing valve seat structure of a conventional swing check valve.

[0017] Among them, 1-valve seat, 2-valve disc, 3-seal, 4-fastener, 5-O-ring, 6-fireproof graphite, 7-valve body, 11-first installation groove, 12-second installation groove. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] The soft-sealed valve seat structure of a large-caliber swing check valve includes a valve seat 1 and a valve disc 2. The valve seat 1 includes a first mounting groove 11, which is arranged on the sealing surface of the valve seat 1 and the valve disc 2; a sealing member 3, which is a PTFE or RPTFE sealing ring, which is not easy to age and is more reliable when used in a dynamic sealing position. The sealing member 3 is arranged in the first mounting groove 11, and the sealing member 3 and the first mounting groove 11 are interference-fitted. The upper end surface of the sealing member 3 is flush with the sealing surface of the valve seat 1, and the valve seat 1 is sealed with the valve disc 2 through the sealing member 3. The sealing member is inserted into the new valve seat 3 by interference fit to form a seal. When the valve is in a fully closed state, the medium pressure presses the valve disc against the new valve seat, so that the valve disc 7 and the sealing member fit together to achieve a sealing effect. Since the sealing member is embedded in the valve seat, the sealing member is not eroded by the medium, which well avoids damage and falling off caused by the erosion of the medium, and achieves a better sealing effect and is more reliable. In this novel structure, the sealing surface between the seal and the valve disc is a surface seal, which increases the effective sealing surface width to a certain extent and can effectively avoid the phenomenon that the valve is not closed tightly when the medium pressure becomes smaller.

[0020] The valve seat 1 is also provided with a second mounting groove 12, and the valve seat 1 is fixedly mounted on the valve body through the second mounting groove 12 and the fastener 4. The second mounting groove 12 is arranged at the rear end of the valve seat 1, and the fastener 4 is installed in the second mounting groove 12 to tightly fix the valve seat 1 on the valve body. The valve seat is tightly fixed on the valve body by a certain number of screws, and it is convenient to disassemble and assemble.

[0021] An O-ring 5 and fireproof graphite 6 are also provided on the outer circle of the valve seat 1. The O-ring 5 and fireproof graphite 6 are located between the valve seat 1 and the valve body to achieve sealing and fireproofing functions between the valve seat 1 and the valve body.

[0022] A large-caliber swing check valve comprises a valve body 7, wherein the valve body is provided with the soft sealing valve seat structure.

[0023] Technical personnel should note: Although the utility model has been described according to the above specific implementation methods, the utility model concept is not limited to this utility model. Any modification using the utility model concept will be included in the scope of protection of this patent.

[0024] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A large-caliber swing check valve soft-sealed valve seat structure, comprising a valve seat (1) and a valve disc (2), characterized in that: The valve seat (1) comprises: A first mounting groove (11), wherein the first mounting groove (11) is arranged on a sealing surface between the valve seat (1) and the valve disc (2); A sealing member (3), wherein the sealing member (3) is arranged in the first mounting groove (11), the sealing member (3) and the first mounting groove (11) are in interference fit, the upper end surface of the sealing member (3) is flush with the sealing surface of the valve seat (1), and the valve seat (1) is in surface sealing fit with the valve disc (2) through the sealing member (3).

2. The soft sealing valve seat structure of a large-caliber swing check valve according to claim 1 is characterized in that: The valve seat (1) is also provided with a second mounting groove (12), and the valve seat (1) is fixedly mounted on the valve body via the second mounting groove (12) and the fastener (4).

3. The soft sealing valve seat structure of a large-caliber swing check valve according to claim 2 is characterized in that: An O-ring (5) and fireproof graphite (6) are also provided on the outer circle of the valve seat (1); the O-ring (5) and fireproof graphite (6) are located between the valve seat (1) and the valve body to achieve sealing and fireproofing functions between the valve seat (1) and the valve body.

4. The soft sealing valve seat structure of a large-caliber swing check valve according to claim 1 is characterized in that: The sealing element (3) is a PTFE or RPTFE sealing ring.

5. The soft sealing valve seat structure of a large-caliber swing check valve according to claim 2 is characterized in that: The second mounting groove (12) is arranged at the rear end of the valve seat (1), and a fastener (4) is installed in the second mounting groove (12) to tightly fix the valve seat (1) on the valve body.

6. A large-caliber swing check valve, characterized in that: It comprises a valve body (7), wherein the soft sealing valve seat structure according to any one of claims 1 to 5 is provided in the valve body.

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