Butterfly valve with metal seal structure

Abstract

The utility model discloses a butterfly valve with metal seal structure, including valve body, valve plate, valve rod and valve seat, the valve plate is by the lining, the pressing plate and the metal seal ring one clamped in the middle constitute, the pressing plate one side along the circumference towards the lining is equipped with a plurality of studs no.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a butterfly valve with a metal sealing structure. Background Technology

[0002] Butterfly valves are simple regulating valves widely used in the control of various fluid pipelines. In harsh conditions such as high temperature, high pressure or corrosive media, metal-sealed butterfly valves are usually used.

[0003] Currently, the valve seat (i.e. the sealing element) of metal-sealed butterfly valves is usually fixed to the valve body by interference fit, welding, or integral structure. Although this structure ensures the reliability of the seal, when the valve seat sealing surface is worn or damaged and needs to be replaced, disassembly is extremely difficult. It often requires professional tools or even destructive removal, which not only makes the maintenance time long and costly, but may also damage the valve body, leading to the scrapping of the entire valve.

[0004] To address this issue, we propose a butterfly valve with a metal sealing structure. Utility Model Content

[0005] The purpose of this invention is to provide a butterfly valve with a metal sealing structure to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A butterfly valve with a metal sealing structure includes a valve body, a valve plate, a valve stem, and a valve seat. The valve stem passes through the valve body and drives the valve plate to rotate. The valve seat is disposed in the inner cavity of the valve body. The valve plate is composed of a liner, a pressure plate, and a metal sealing ring sandwiched in the middle. The pressure plate is provided with a plurality of studs along the circumference on the side facing the liner. One end of the studs passing through the outside of the liner is locked and connected by a sealing washer and a nut.

[0008] The valve seat consists of a metal sealing ring II, a raised edge, and a sealing ring sandwiched in the middle. The raised edge is integrally formed with the valve body, and a plurality of studs II are provided circumferentially on the side of the raised edge facing the metal sealing ring II. One end of the studs II that passes through the metal sealing ring II is locked and connected by a sealing washer II and a nut II.

[0009] In a further embodiment, the end face of the liner near the metal sealing ring is provided with an annular groove and radial grooves evenly distributed along the circumference of the annular groove, and the radial grooves are parallel to the radial direction of the liner. The end face of the metal sealing ring near the liner is provided with a convex ring and convex ridges evenly distributed along the circumference of the convex ring, and the convex ridges are parallel to the radial direction of the metal sealing ring.

[0010] In a further embodiment, the end face of the pressure plate near the liner is also provided with reinforcing ribs.

[0011] In a further embodiment, the circumferential sealing surface of the first metal sealing ring and the circumferential sealing surface of the second metal sealing ring form a sealing pair.

[0012] In a further embodiment, the metal sealing ring has a sealing groove symmetrically formed on the opposite end face of the pressure plate, and a molding ring is embedded in the sealing groove.

[0013] In a further embodiment, the convex edge and the opposite end face of the second metal sealing ring are symmetrically provided with corrugated grooves, and the sealing ring is embedded in the corrugated grooves.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] Both the valve plate assembly and the valve seat assembly of this utility model adopt a detachable structure with bolt connection. When the sealing surface is worn or damaged, simply remove the valve, loosen the corresponding nut, and the old metal sealing ring 1 and metal sealing ring 2 can be easily removed and replaced with new ones without any special tools or destructive operations, which greatly shortens the maintenance time and reduces maintenance costs and labor intensity. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the structure of this utility model after cross-section.

[0018] Figure 3 This is a top-view sectional view of the structure of this utility model;

[0019] Figure 4 This is a partial structural diagram of the valve seat of this utility model after cross-section;

[0020] Figure 5 This is a schematic diagram of the valve plate structure of this utility model;

[0021] Figure 6 This is a schematic diagram of the structure of the metal sealing ring of this utility model.

[0022] In the diagram: 1. Valve body; 2. Valve plate; 21. Liner; 211. Annular groove; 212. Diameter groove; 22. Pressure plate; 221. Reinforcing rib; 23. Metal sealing ring one; 231. Raised ring; 232. Raised ridge; 24. Stud one; 25. Sealing washer one; 26. Nut one; 27. O-ring; 3. Valve stem; 4. Valve seat; 41. Metal sealing ring two; 42. Raised edge; 43. Sealing ring; 44. Stud two; 45. Sealing washer two; 46. Nut two; 47. Corrugated groove. Detailed Implementation

[0023] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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 this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please see Figure 1-6 A butterfly valve with a metal sealing structure includes a valve body 1, a valve plate 2, a valve stem 3, and a valve seat 4. The valve seat 4 and the valve plate 2 are disposed in the inner cavity channel of the valve body 1. The valve stem 3 is fixedly connected to the valve plate 2 and is used to drive the valve plate 2 to rotate. The top of the valve stem 3 protrudes from the valve body 1 for easy operation.

[0027] The valve plate 2 consists of a liner 21, a pressure plate 22, and a metal sealing ring 23 sandwiched between the two. During assembly, the protruding ring 231 of the metal sealing ring 23 is first aligned with the annular groove 211 on the end face of the liner 21, and the protruding ridge 232 on it is embedded into the radial groove 212 of the liner 21. This fitting structure ensures that the metal sealing ring 23 is precisely positioned and will not rotate or shift. Then, several studs 24 on the end face of the pressure plate 22 are passed through the corresponding through holes on the liner 21. Sealing washers 25 are sequentially fitted onto the end of the studs 24 that protrude from the end face. Then, the nuts 26 are tightened. During the tightening process, the pressure plate 22 enhances its own rigidity through the reinforcing ribs 221 and applies the clamping force evenly to the metal sealing ring 23, making it fit tightly against the liner 21. In addition, O-rings 27 are pre-embedded in the sealing grooves opened on the opposite end faces of the metal sealing ring 23 and the pressure plate 22 to achieve auxiliary static sealing between the two.

[0028] The valve seat 4 consists of a metal sealing ring 41, a raised edge 42 integrally formed with the valve body 1, and a sealing ring 43 sandwiched between the two. During assembly, the sealing ring 43 is first embedded into the corrugated groove 47 on the end face of the raised edge 42. Then, the metal sealing ring 41 is put on the raised edge 42, so that several studs 44 on the raised edge 42 pass through the through holes on the metal sealing ring 41. At the end of the studs 44 that protrude, sealing washers 45 are put on in sequence. Then, the nut 46 is tightened. After locking, the sealing ring 43 is compressed in the corrugated groove 47, forming a reliable static seal between the valve body 1 and the valve seat 4.

[0029] When the valve is closed, the valve plate 2, driven by the valve stem 3, rotates to contact the valve seat 4. At this time, the circumferential sealing surface of the metal sealing ring 23 on the valve plate 2 is tightly fitted with the circumferential sealing surface of the metal sealing ring 41 on the valve seat 4, forming a strong metal-to-metal main sealing pair, which can effectively cut off the fluid.

[0030] It will be apparent to those skilled in the art that this 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 this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0031] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and 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 butterfly valve with a metal sealing structure, comprising a valve body (1), a valve plate (2), a valve stem (3), and a valve seat (4), wherein the valve stem (3) passes through the valve body (1) and drives the valve plate (2) to rotate, and the valve seat (4) is disposed in the inner cavity channel of the valve body (1), characterized in that: The valve plate (2) is composed of a liner (21), a pressure plate (22) and a metal sealing ring (23) sandwiched in the middle. The pressure plate (22) has a plurality of studs (24) circumferentially arranged on the side facing the liner (21). The end of the stud (24) that passes through the outside of the liner (21) is locked and connected by a sealing washer (25) and a nut (26). The valve seat (4) is composed of a metal sealing ring (41), a raised edge (42), and a sealing ring (43) sandwiched in the middle. The raised edge (42) is integrally formed with the valve body (1), and a plurality of studs (44) are provided circumferentially on the side of the raised edge (42) facing the metal sealing ring (41). The end of the stud (44) passing through the metal sealing ring (41) is locked and connected by a sealing washer (45) and a nut (46).

2. A butterfly valve with a metal sealing structure according to claim 1, characterized in that: The end face of the liner (21) near the metal sealing ring (23) is provided with an annular groove (211) and a radial groove (212) evenly distributed around the annular groove (211). The radial groove (212) is parallel to the radial side of the liner (21). The end face of the metal sealing ring (23) near the liner (21) is provided with a convex ring (231) and a convex ridge (232) evenly distributed around the convex ring (231). The convex ridge (232) is parallel to the radial side of the metal sealing ring (23).

3. A butterfly valve with a metal sealing structure according to claim 1, characterized in that: The end face of the pressure plate (22) near the liner (21) is also provided with reinforcing ribs (221).

4. A butterfly valve with a metal sealing structure according to claim 1, characterized in that: The circumferential sealing surface of the first metal sealing ring (23) and the circumferential sealing surface of the second metal sealing ring (41) form a sealing pair.

5. A butterfly valve with a metal sealing structure according to claim 1, characterized in that: The metal sealing ring (23) and the pressure plate (22) have symmetrically opened sealing grooves on their opposite end faces, and an O-ring (27) is embedded in the sealing groove.

6. A butterfly valve with a metal sealing structure according to claim 1, characterized in that: The convex edge (42) and the metal sealing ring (41) are symmetrically provided with corrugated grooves (47), and the sealing ring (43) is embedded in the corrugated grooves (47).

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