Split type valve element for balance valve

Abstract

The utility model relates to the technical field of balance valves, in particular to a split type valve core for a balance valve, which comprises a T-shaped guide column, a sheet type sealing ring and a T-shaped fixing column which are coaxially arranged, a threaded hole is formed in the center of the top of the T-shaped guide column, and external threads matched with the threaded hole are arranged at the bottom of the T-shaped fixing column. The sheet type sealing ring is arranged in the annular positioning groove in the top of the T-shaped guide column, the external thread at the bottom of the T-shaped fixing column is screwed into the threaded hole in the center of the guide column, the sealing ring is pressed and fixed through mechanical clamping force between the shaft shoulder of the fixing column and the top face of the guide column, and a stable detachable sealing interface is formed. In addition, the independent compression-molded sheet type sealing ring can be quickly replaced only by unscrewing the T-shaped fixing column with a tool, so that the effects of quickly disassembling and assembling the sealing ring and eliminating the dependence of a vulcanization process are achieved.

Description

Technical Field

[0001] This utility model relates to the field of balancing valve technology, and more specifically to a split valve core for a balancing valve. Background Technology

[0002] As a key component for flow regulation in hydraulic or water systems, the balancing valve mainly consists of a valve body, valve core, valve stem, etc. (e.g.) Figure 4 As shown in the figure, its working process is to drive the valve stem by rotating the handwheel, which drives the valve core to move axially upward in the valve body cavity, thereby opening the direct flow channel between the outer surface of the valve core and the inner wall of the valve body cavity, allowing fluid to pass through. In this type of balanced valve design, an annular sealing ring is usually provided on the outer circumference of the valve core. The core function of this sealing ring is to achieve dynamic sealing between the outer surface of the valve core and the inner wall of the valve body cavity when the valve core is in the closed position (not moved up or down to reset), preventing fluid from passing through.

[0003] However, in existing technologies, the vulcanization bonding process is commonly used to permanently fix the sealing ring directly into the groove on the valve core surface. This manufacturing method has significant drawbacks:

[0004] First, the irreversible chemical bonding formed by vulcanization causes the sealing ring and valve core to become one. Once the sealing ring fails due to wear, compression deformation, aging or corrosion caused by long-term reciprocating motion - which is an inevitable loss faced by this type of dynamic seal - the sealing ring cannot be replaced alone, and the entire valve core assembly must be discarded, resulting in resource waste and high maintenance costs.

[0005] Secondly, during the high-temperature and high-pressure vulcanization process, some rubber material inevitably overflows from the predetermined grooves, forming useless flash or excess glue in the non-sealing areas of the valve core (such as the groove edges or end faces). This not only wastes raw materials and requires additional cleaning processes, but if the residual excess glue is not cleaned properly, it may also cause additional friction or even jamming when the valve core moves. At the same time, it will also damage the geometric accuracy of the sealing ring contour (such as lip shape and outer diameter), directly affecting its sealing contact state and reliability with the valve body cavity wall. Furthermore, as a one-piece molding process, vulcanization is subject to multiple factors such as mold accuracy, temperature, pressure, and time, making it difficult to accurately and stably control the key performance parameters of the sealing ring (such as rubber hardness, elastic modulus, lip size, and vulcanization uniformity). This can easily lead to fluctuations in sealing performance, increased leakage risk, or unstable opening and closing torque.

[0006] Furthermore, this design, which solidifies the vulnerable sealing ring and core valve core for single use, greatly limits the valve's maintainability and reusability. Utility Model Content

[0007] The purpose of this utility model is to solve the above-mentioned technical problems by providing a split valve core for a balance valve that allows for quick disassembly and assembly of the sealing ring and eliminates dependence on the vulcanization process.

[0008] To achieve the above objectives, this utility model specifically adopts the following technical solution:

[0009] This utility model proposes a split valve core for a balance valve, which includes a T-shaped guide post, a plate-type sealing ring and a T-shaped fixing post arranged coaxially;

[0010] The top center of the T-shaped guide post is provided with a threaded hole, and the bottom of the T-shaped fixing post is provided with an external thread that mates with the threaded hole.

[0011] The sheet-type sealing ring is fitted onto the bottom of the T-shaped fixing post and clamped between the top surface of the T-shaped guide post and the shoulder of the T-shaped fixing post to form a detachable sealing structure.

[0012] As a preferred embodiment of the present invention, the sheet-type sealing ring includes a horizontally extending inner circular sheet and an outer circular ring vertically connected to its outer edge.

[0013] The axial height of the outer annular body is greater than the thickness of the inner circular plate, and the height difference is 1.5-2.5 mm;

[0014] The inner circular plate has a central hole that mates with the T-shaped fixing post.

[0015] As a preferred technical solution of this utility model, the top surface of the T-shaped guide post is provided with an annular positioning groove that matches the contour of the sheet-type sealing ring and has a depth of 3-5mm. The depth of the annular positioning groove is not less than the thickness of the inner circular sheet-like body of the sheet-type sealing ring.

[0016] As a preferred embodiment of this utility model, the axial height of the outer wall of the annular positioning groove exceeds the top plane of the annular body of the sheet seal ring, that is, the height of the outer wall of the annular positioning groove exceeds the top plane of the outer annular body of the sheet seal ring by 2-4 mm.

[0017] As a preferred technical solution of this utility model, the top end face of the T-shaped fixing column is provided with a tool fitting hole, which is an internal hexagonal hole, a cross groove or a slotted groove.

[0018] As a preferred technical solution of this utility model, the sheet sealing ring is molded from EPDM rubber with a hardness of 70±5 Shore A.

[0019] As a preferred technical solution of this utility model, both the T-shaped guide post and the T-shaped fixing post are made of QT450-10 ductile iron with a tensile strength ≥450MPa.

[0020] As a preferred embodiment of this utility model, both the T-shaped guide post and the T-shaped fixing post include an upper column and a lower column that are coaxially and integrally cast. The diameter of the lower column is smaller than the diameter of the upper column. The diameter of the lower column is 0.2-0.85 times the diameter of the upper column. The total volume of the T-shaped fixing post is 0.3-0.5 times the total volume of the T-shaped guide post.

[0021] The beneficial effects of this utility model are as follows:

[0022] This invention uses a sheet-type sealing ring placed in the annular positioning groove at the top of a T-shaped guide post. The sealing ring is screwed into the threaded hole at the center of the guide post through the external thread at the bottom of the T-shaped fixing post. The mechanical clamping force between the shoulder of the fixing post and the top surface of the guide post is used to press and fix the sealing ring, forming a stable and detachable sealing interface. In addition, the independently molded sheet-type sealing ring can be quickly replaced by simply loosening the T-shaped fixing post with a tool. This achieves the effect of quick installation and removal of the sealing ring and eliminates dependence on the vulcanization process. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this utility model;

[0024] Figure 2 This is a schematic diagram of the T-shaped fixing column structure of this utility model;

[0025] Figure 3 This is a schematic diagram of the T-shaped guide post structure of this utility model;

[0026] Figure 4 This is a schematic diagram of the structure of a traditional balancing valve.

[0027] Reference numerals: 1. T-shaped guide post; 11. Annular positioning groove; 2. Plate-type sealing ring; 21. Inner circular plate-shaped body; 22. Outer circular ring-shaped body; 23. Center hole; 3. T-shaped fixing post; 31. Tool mating hole. Detailed Implementation

[0028] Reference Figure 1-3 As shown, this utility model proposes a split valve core for a balance valve, including a T-shaped guide post, a plate-type sealing ring, and a T-shaped fixing post arranged coaxially;

[0029] The top center of the T-shaped guide post is provided with a threaded hole, and the bottom of the T-shaped fixing post is provided with an external thread that mates with the threaded hole.

[0030] The sheet-type sealing ring is sleeved on the bottom of the T-shaped fixing post and clamped between the top surface of the T-shaped guide post and the shoulder of the T-shaped fixing post to form a detachable sealing structure;

[0031] The sheet-type sealing ring includes a horizontally extending inner circular sheet and an outer circular ring that is vertically connected to its outer edge.

[0032] The axial height of the outer annular body is greater than the thickness of the inner circular plate, and the height difference is 1.5-2.5 mm;

[0033] The inner circular plate-shaped body has a central hole that mates with the T-shaped fixing post.

[0034] The top surface of the T-shaped guide post is provided with an annular positioning groove that matches the contour of the sheet seal ring and has a depth of 3-5mm. The depth of the annular positioning groove is not less than the thickness of the inner circular sheet of the sheet seal ring.

[0035] Wherein, the axial height of the outer wall of the annular positioning groove exceeds the top plane of the annular body of the sheet seal ring, that is, the height of the outer wall of the annular positioning groove exceeds the top plane of the outer annular body of the sheet seal ring by 2-4mm.

[0036] The top end face of the T-shaped fixing post is provided with a tool fitting hole, which is an internal hexagonal hole, a cross groove, or a slotted groove.

[0037] The sheet-type sealing ring is molded from EPDM rubber with a hardness of 70±5 Shore A.

[0038] The T-shaped guide post and the T-shaped fixing post are both made of QT450-10 ductile iron with a tensile strength ≥450MPa.

[0039] The T-shaped guide post and the T-shaped fixing post each include an upper column and a lower column cast coaxially and integrally. The diameter of the lower column is smaller than the diameter of the upper column. The diameter of the lower column is 0.2-0.85 times the diameter of the upper column. The total volume of the T-shaped fixing post is 0.3-0.5 times the total volume of the T-shaped guide post.

[0040] Working principle: During assembly, the plate seal ring is placed in the annular positioning groove at the top of the T-shaped guide post. It is then screwed into the threaded hole at the center of the guide post through the external thread at the bottom of the T-shaped fixing post. The mechanical clamping force between the shoulder of the T-shaped fixing post and the top surface of the T-shaped guide post compresses and fixes the seal ring, forming a stable and detachable sealing assembly. When the valve core moves down to close, the outer wall of the annular positioning groove (its height exceeds the top of the seal ring) provides radial constraint, forcing the outer annular body of the seal ring to elastically compress and fit against the inner wall of the valve body, thus closing the direct flow channel of the valve body. When the valve core moves up to open, the lip of the seal ring disengages from the valve body wall, the direct flow channel opens, and the fluid passes directly through. After the plate seal ring fails, it can be quickly replaced with an independently molded plate seal ring simply by loosening the T-shaped fixing post with a tool. This achieves the effect of quick disassembly and assembly of the seal ring and eliminates dependence on the vulcanization process.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model 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 basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0042] 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 split-type valve core for a balancing valve, characterized in that: It includes a T-shaped guide post (1), a plate seal ring (2), and a T-shaped fixing post (3) arranged coaxially; the top center of the T-shaped guide post (1) is provided with a threaded hole, and the bottom of the T-shaped fixing post (3) is provided with an external thread that mates with the threaded hole; the plate seal ring (2) is sleeved on the bottom of the T-shaped fixing post (3) and clamped between the top surface of the T-shaped guide post (1) and the shoulder of the T-shaped fixing post (3) to form a detachable sealing structure.

2. The split-type valve core for a balancing valve according to claim 1, characterized in that: The sheet-type sealing ring (2) includes a horizontally extending inner circular sheet (21) and an outer circular ring (22) vertically connected to its outer edge. The axial height of the outer circular ring (22) is greater than the thickness of the inner circular sheet (21). The inner circular sheet (21) has a central hole (23) that is connected to the T-shaped fixing post (3).

3. A split-type valve core for a balancing valve according to claim 1 or 2, characterized in that: The top surface of the T-shaped guide post (1) is provided with an annular positioning groove (11) that matches the contour of the sheet seal ring (2). The depth of the annular positioning groove (11) is not less than the thickness of the inner circular sheet (21) of the sheet seal ring (2).

4. A split-type valve core for a balancing valve according to claim 3, characterized in that: The axial height of the outer wall (111) of the annular positioning groove (11) exceeds the top plane of the outer annular body (22) of the sheet seal (2).

5. A split-type valve core for a balancing valve according to claim 1, characterized in that: The top end face of the T-shaped fixing post (3) is provided with a tool fitting hole (31), which is an internal hexagonal hole, a cross groove or a slotted groove.

6. A split-type valve core for a balancing valve according to claim 1, characterized in that: The sheet-type sealing ring (2) is molded from EPDM rubber.

7. A split-type valve core for a balancing valve according to claim 1, characterized in that: Both the T-shaped guide post (1) and the T-shaped fixing post (3) are made of QT450-10 ductile iron.

8. A split-type valve core for a balancing valve according to claim 1, characterized in that: Both the T-shaped guide post (1) and the T-shaped fixed post (3) include an upper column and a lower column that are coaxially and integrally cast, and the diameter of the lower column is smaller than the diameter of the upper column.

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