Self-pressure sealing stop valve

Abstract

The utility model discloses a self-pressure sealing stop valve which comprises a stop valve body, a cover plate is fixedly installed on the surface of the upper end of the stop valve body, and a valve rod is connected to the surface of the inner side of the cover plate through threads. A first sealing clamping plate, a second sealing clamping plate and a third sealing clamping plate are mounted on the inner side surface of the lower end of the stop valve body through screws, annular clamping grooves are formed in the surfaces of the first sealing clamping plate, the second sealing clamping plate and the third sealing clamping plate, and first rubber rings are clamped in the annular clamping grooves of the second sealing clamping plate and the third sealing clamping plate; the three sets of sealing clamping plates are adopted to clamp the rubber ring structure, compression deformation can be achieved, the rubber ring can be tightly attached to the outer surface of the valve rod, attaching can be tight, the sealing performance is improved, the mechanism is simple, the structure is simple, the cost is low, and the sealing effect is good. Disassembly and assembly are convenient.

Description

Technical Field

[0001] The utility model relates to the field of self-pressure sealing globe valves, and more specifically, to a self-pressure sealing globe valve. Background Art

[0002] A globe valve, also known as a stop valve, belongs to a forced-sealing valve. Therefore, when the valve is closed, pressure must be applied to the valve flap to force the sealing surface not to leak. When the medium enters the valve from below the valve flap, the resistance that the operating force needs to overcome is the friction between the valve stem and the packing and the thrust generated by the pressure of the medium. The force to close the valve is greater than the force to open the valve, so the diameter of the valve stem needs to be large, otherwise the valve stem will be bent. It is divided into three types according to the connection method: flange connection, threaded connection, and welding connection. Since the appearance of self-sealing valves, the flow direction of the medium of the globe valve has changed to enter the valve cavity from above the valve flap. At this time, under the action of the medium pressure, the force to close the valve is small, and the force to open the valve is large, and the diameter of the valve stem can be correspondingly reduced. At the same time, under the action of the medium, the sealing of this type of valve needs to be tight;

[0003] During the use of traditional sealing globe valves, although the sealing effect between the valve flap and the sealing surface is relatively good, when the valve is opened or closed, the valve stem moves up and down inside the valve body, resulting in wear between the valve stem and the packing ring inside the valve body, making it easy for the medium to leak above the globe valve body. And after long-term use, when the valve plate is worn, since the globe valve body of the globe valve is an integral structure, it is necessary to disassemble all the structures at the top of the globe valve before the valve stem and the valve flap can be taken out and replaced, and the process of replacing the valve flap is troublesome;

[0004] In the prior art, as disclosed in the utility model with the authorization publication number CN216975801U, a self-pressure sealing globe valve is disclosed, including a globe valve body. The two ends of the globe valve body are respectively a discharge port and a feed port. A sealing surface is provided in the middle of the inner cavity of the globe valve body. A first valve body is provided at the top of the globe valve body. In the utility model, a globe valve body, a first valve body, a second valve body, a valve cover, a handwheel, a valve stem, a valve flap, a sealing ring, and a thin rubber ring are provided. An annular groove is provided near the sealing ring of the globe valve body. When the valve flap fits with the sealing surface in the middle of the globe valve body to close the globe valve, the thin rubber ring just lies inside the top of the annular groove. Due to the pressure of the medium (gas or liquid) on the feed port side, the thin rubber ring will fit more tightly with the inner top wall of the annular groove. Secondly, an annular rubber airbag, a micro air pump, and a connecting pipe are provided inside the second valve body. By inflating the annular rubber airbag to make it expand, the sealing performance during the up and down movement of the valve stem can be further increased, preventing the medium inside the globe valve from leaking from the top of the valve;

[0005] In the above-mentioned patent, multiple sets of sealing mechanism components are adopted, which are cumbersome and complex, with high costs. Moreover, an external inflation mechanism is required for inflation and sealing, resulting in high costs and inconvenient disassembly and assembly. Summary of the Invention

[0006] Aiming at the problems existing in the prior art, the purpose of the present utility model is to provide a self-pressure sealing globe valve. By adopting a structure of three groups of sealing splints clamping a rubber ring, which can be compressed and deformed, the rubber ring can be closely attached to the outer surface of the valve stem, with tight fitting, improved sealing performance, simple mechanism, and convenient disassembly and assembly.

[0007] To solve the above problems, the present utility model adopts the following technical solutions.

[0008] A self-pressure sealing globe valve includes a globe valve body. A cover plate is fixedly installed on the upper surface of the globe valve body. The inner surface of the cover plate is threadedly connected with a valve stem. The first sealing splint, the second sealing splint, and the third sealing splint are installed on the inner surface of the lower end of the globe valve body by screws. Annular clamping grooves are provided on the surfaces of the first sealing splint, the second sealing splint, and the third sealing splint. A first rubber ring is clamped at the annular clamping grooves of the second sealing splint and the third sealing splint. A second rubber ring is clamped on the inner surface of the annular clamping grooves of the first sealing splint and the second sealing splint. The upper end of the valve stem is provided with an external thread, and the lower end of the valve stem is treated with a smooth surface. The inner surfaces of the first rubber ring and the second rubber ring are pressed against the outer surface of the lower end of the valve stem. An extrusion valve block is installed at the lower end of the valve stem. An arched plate is provided at the upper end of the extrusion valve block. A convex shaft is provided at the lower end of the valve stem, and the convex shaft penetrates through the inner surface of the arched plate. By adopting a structure of three groups of sealing splints clamping a rubber ring, which can be compressed and deformed, the rubber ring can be closely attached to the outer surface of the valve stem, with tight fitting, improved sealing performance, simple mechanism, and convenient disassembly and assembly.

[0009] Further, four groups of screws are distributed to install the first sealing splint, the second sealing splint, and the third sealing splint. The screws are threadedly connected to the inner surface of the globe valve body, and the screws lock the first sealing splint, the second sealing splint, and the third sealing splint.

[0010] Further, the cover plate is fixedly connected to the upper surface of the globe valve body by bolts, and the bolts are internal hexagonal bolts.

[0011] Further, a rotary handle is fixedly connected to the upper surface of the valve stem.

[0012] Further, the outer surface of the extrusion valve block is pressed against the inner surface of the globe valve body.

[0013] Further, four groups of insertion holes are provided at the outer ends of the first sealing splint, the second sealing splint, and the third sealing splint.

[0014] Further, the outer surface of the extrusion valve block is covered with a rubber layer.

[0015] Compared with the prior art, the advantages of the present utility model are as follows:

[0016] (1) By adopting a structure of three groups of sealing clamping plates clamping a rubber ring, which can be compressed and deformed, the rubber ring can be closely attached to the outer surface of the valve stem, with a tight fit, improving the sealing performance. The mechanism is simple and convenient for disassembly and assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic view of the overall structure of the present utility model;

[0018] Figure 2 is a view of the first sealing clamping plate of the present utility model;

[0019] Figure 3 is a view of the third sealing clamping plate of the present utility model;

[0020] Figure 4 is a sectional view of the overall structure of the present utility model;

[0021] Figure 5 is a view of the distribution of the valve stem and the extrusion valve block of the present utility model.

[0022] Description of the reference numerals in the drawings:

[0023] 1 globe valve body, 2 cover plate, 3 first sealing clamping plate, 4 second sealing clamping plate, 5 third sealing clamping plate, 345 annular clamping groove, 6 first rubber ring, 7 second rubber ring, 8 valve stem, 80 extrusion valve block, 81 arched plate, 82 convex shaft, 9 rotary handle, 10 screw. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model. Embodiment

[0025] Please refer to Figures 1-5, a self-pressure-sealing globe valve, comprising a globe valve body 1, a cover plate 2 is fixedly installed on the upper surface of the globe valve body 1, a valve stem 8 is threadedly connected to the inner surface of the cover plate 2, and a first sealing splint 3, a second sealing splint 4, and a third sealing splint 5 are installed on the lower inner surface of the globe valve body 1 by screws 10. Annular clamping grooves 345 are provided on the surfaces of the first sealing splint 3, the second sealing splint 4, and the third sealing splint 5. A first rubber ring 6 is clamped at the annular clamping grooves 345 of the second sealing splint 4 and the third sealing splint 5. A second rubber ring 7 is clamped on the inner surface of the annular clamping grooves 345 of the first sealing splint 3 and the second sealing splint 4. The upper end of the valve stem 8 is provided with an external thread, and the lower end of the valve stem 8 is treated with a smooth surface. The inner surfaces of the first rubber ring 6 and the second rubber ring 7 are pressed against the outer surface of the lower end of the valve stem 8. An extrusion valve block 80 is installed at the lower end of the valve stem 8. An arched plate 81 is provided at the upper end of the extrusion valve block 80. A convex shaft 82 is provided at the lower end of the valve stem 8, and the convex shaft 82 is inserted through the inner surface of the arched plate 81. By adopting a structure of three groups of sealing splints clamping rubber rings, it can be compressed and deformed, enabling the rubber rings to closely fit on the outer surface of the valve stem, with tight fit and improved sealing performance. The mechanism is simple and convenient for disassembly and assembly;

[0026] Four groups of screws 10 are distributed and installed on the first sealing splint 3, the second sealing splint 4, and the third sealing splint 5. The screws 10 are threadedly connected to the inner surface of the globe valve body 1, and the screws 10 lock the first sealing splint 3, the second sealing splint 4, and the third sealing splint 5, facilitating installation and locking;

[0027] The cover plate 2 is fixedly connected to the upper surface of the globe valve body 1 by bolts, and the bolts are hexagon socket head cap screws, making the installation of the cover plate 2 convenient;

[0028] A rotary handle 9 is fixedly connected to the upper surface of the valve stem 8. The rotary handle 9 adopts a disc structure, and a bent opening structure is provided on its surface. Four groups of bent openings are distributed on the surface of the rotary handle 9. It can be held and rotated to operate the rotary handle 9, which is convenient to use. The outer surface of the extrusion valve block 80 is pressed against the inner surface of the globe valve body 1 to block and cut off;

[0029] Four groups of insertion holes are provided at the outer ends of the first sealing splint 3, the second sealing splint 4, and the third sealing splint 5, facilitating the insertion and installation of the screws 10. The first sealing splint 3, the second sealing splint 4, and the third sealing splint 5 can be jointly inserted along the insertion holes, enabling insertion and installation and being fixed together, which is convenient to use;

[0030] The outer surface of the extrusion valve block 80 is covered with a rubber layer, which can increase the sealing performance when closing and blocking;

[0031] When in use, by rotating the handle 9 downward, the valve stem 8 descends, which can drive the extrusion valve block 80 to rotate downward and seal against the inner surface of the stop valve body 1. An arched plate 81 is provided at the upper end of the extrusion valve block 80, and a convex shaft 82 is provided at the lower end of the valve stem 8. The convex shaft 82 is inserted through the inner surface of the arched plate 81. When tightening, the valve stem 8 rotates, which can drive the convex shaft 82 to rotate within the arched plate 81, and can squeeze the extrusion valve block 80 downward to lock and seal, facilitating rotation and locking.

[0032] A first sealing splint 3, a second sealing splint 4, and a third sealing splint 5 are installed on the inner surface of the lower end of the stop valve body 1 through screws 10. Annular clamping grooves 345 are provided on the surfaces of the first sealing splint 3, the second sealing splint 4, and the third sealing splint 5. A first rubber ring 6 is clamped at the annular clamping grooves 345 of the second sealing splint 4 and the third sealing splint 5, and a second rubber ring 7 is clamped on the inner surface at the annular clamping grooves 345 of the first sealing splint 3 and the second sealing splint 4 (as Figure 4 ) and Figure 4 the inside is in an unpacked and unlocked state. When in use, by tightening the screw 10, the first sealing splint 3, the second sealing splint 4, and the third sealing splint 5 can be locked, and the first sealing splint 3, the second sealing splint 4, and the third sealing splint 5 can squeeze the first rubber ring 6 and the second rubber ring 7. Since the first rubber ring 6 and the second rubber ring 7 are made of rubber material, when squeezed and flattened, the inner ends can be deformed and compressed, and the inner surfaces of the first rubber ring 6 and the second rubber ring 7 can be squeezed against the outer surface of the lower end of the valve stem 8.

[0033] The above is only the preferred specific implementation manner of the present invention; however, the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its improved concept, makes equivalent replacements or changes, and should be covered by the protection scope of the present invention.

Claims

1. A self-pressure-sealing globe valve, comprising a globe valve body (1), characterized in that: A cover plate (2) is fixedly installed on the upper end surface of the globe valve body (1). The inner surface of the cover plate (2) is threadedly connected with a valve stem (8). The first sealing clamping plate (3), the second sealing clamping plate (4), and the third sealing clamping plate (5) are installed on the inner surface of the lower end of the globe valve body (1) by screws (10). An annular clamping groove (345) is provided on the surfaces of the first sealing clamping plate (3), the second sealing clamping plate (4), and the third sealing clamping plate (5). A first rubber ring (6) is clamped at the annular clamping groove (345) of the second sealing clamping plate (4) and the third sealing clamping plate (5). A second rubber ring (7) is clamped on the inner surface of the annular clamping groove (345) of the first sealing clamping plate (3) and the second sealing clamping plate (4). The upper end of the valve stem (8) is provided with an external thread, and the lower end of the valve stem (8) is treated with a smooth surface. The inner surfaces of the first rubber ring (6) and the second rubber ring (7) are pressed against the outer surface of the lower end of the valve stem (8). An extrusion valve block (80) is installed at the lower end of the valve stem (8). An arched plate (81) is provided at the upper end of the extrusion valve block (80). A convex shaft (82) is provided at the lower end of the valve stem (8), and the convex shaft (82) is inserted through the inner surface of the arched plate (81).

2. The self-pressure-sealing globe valve according to claim 1, wherein: Four groups of the screws (10) are distributed to install the first sealing clamping plate (3), the second sealing clamping plate (4), and the third sealing clamping plate (5). The screws (10) are threadedly connected to the inner surface of the globe valve body (1), and the screws (10) lock the first sealing clamping plate (3), the second sealing clamping plate (4), and the third sealing clamping plate (5).

3. The self-pressure-sealing globe valve according to claim 1, characterized in that: The cover plate (2) is fixedly connected to the upper surface of the globe valve body (1) by bolts, and the bolts are hexagon socket head cap screws.

4. A self-pressure-sealing globe valve according to claim 1, characterized in that: A rotary handle (9) is fixedly connected to the upper surface of the valve stem (8).

5. The self-pressure-sealing globe valve according to claim 1, characterized in that: The outer surface of the extrusion valve block (80) is pressed against the inner surface of the globe valve body (1).

6. The self-pressure-sealing globe valve according to claim 1, characterized in that: Four groups of insertion holes are provided at the outer ends of the first sealing clamping plate (3), the second sealing clamping plate (4), and the third sealing clamping plate (5).

7. A self-pressure-sealing globe valve according to claim 1, wherein: The outer surface of the extrusion valve block (80) is covered with a rubber layer.

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