One-piece titanium alloy hard-seal high-carbon graphite non-eccentric C-type ball valve

Abstract

The utility model discloses a one-piece titanium alloy hard seal adds high carbon graphite non eccentric C type ball valve, include: valve body, the both ends of valve body are used for connecting pipeline, internally are equipped with valve cavity and rotate and connect the rotating ball body in valve cavity, and the rotating ball body can rotate along the axis to close or open the pipeline of both ends, and the axis of rotating ball body and the axis of both ends of valve body are perpendicular, and the tubular cavity is formed on the valve body, valve rod, and the rotating ball body is connected the handle of outside top through valve rod, and the valve rod is rotatably connected in the tubular cavity, and the adjustable packing assembly includes combined packing, elastic sheet and connecting cover, and the connecting cover is filled in the combined packing between the valve rod circumferential side and annular step surface through the elastic sheet elastic abutment. Elastic sheet can provide enough pressure to compress combined packing, make combined packing always seal connection in the circumferential side of valve rod, and keep higher sealing property, and the design of four open rings can offset combined packing to bear greater pressure impact, and prevent the rush out or drop of valve rod.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a one-piece titanium alloy hard seal plus high carbon graphite non-eccentric C-type ball valve. Background Technology

[0002] With the continuous growth of the economy, the demand for petroleum, chemicals, fine chemicals, and natural gas is increasing in industries, agriculture, transportation, and people's daily lives. The equipment and pipelines used in petrochemical and natural gas extraction and refining processes are constantly expanding to match the rapidly increasing production capacity, and special chemical operating conditions are becoming more frequent. This necessitates valves with long service life, high performance, and low cost to meet market demands.

[0003] The global fixed ball valve market is expected to maintain steady growth. The Asian region (especially China) is expected to see a significant increase in its share of industrial upgrading, with the Chinese market size projected to reach tens of billions of yuan by 2031. Among them, the demand for wear-resistant and corrosion-resistant valves in the petroleum, chemical, and metallurgical industries is growing at an average annual rate of over 10%. With the increasing market demand for valves for special working conditions, traditional soft-seal ball valves are becoming less suitable due to their poor temperature resistance and weak erosion resistance.

[0004] Therefore, a one-piece titanium alloy hard seal combined with a high-carbon graphite non-eccentric C-type ball valve is still needed to solve the above problems. Utility Model Content

[0005] This utility model provides a one-piece titanium alloy hard seal plus high carbon graphite non-eccentric C-type ball valve to solve the above problems.

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] A one-piece titanium alloy hard seal with high-carbon graphite non-eccentric C-type ball valve, comprising:

[0008] A valve body, with both ends for connecting pipes, has a valve cavity inside and a rotating ball rotatably connected inside the valve cavity. The rotating ball can rotate along an axis to close or open the pipes at both ends. The axis of the rotating ball is perpendicular to the axes of both ends of the valve body, and a cavity is formed on the valve body.

[0009] The valve stem, the rotating ball is connected to the handle on the outer top through the valve stem, the valve stem is rotatably connected in the cavity, the valve stem includes a first connecting part and a second connecting part that are coaxially designed to be connected to each other, the diameter of the first connecting part is larger than the diameter of the second connecting part, and an annular stepped surface is formed on the first connecting part;

[0010] An adjustable packing assembly includes a combined packing, an elastic sheet, and a connecting cover. The connecting cover elastically abuts against the combined packing filled between the valve stem periphery and the annular stepped surface via the elastic sheet.

[0011] In one embodiment, the connecting cap is pierced by an adjusting bolt for adjusting the pressure of the connecting cap on the combined packing.

[0012] In one embodiment, a pressure sleeve is connected to the top of the combined packing, and a pressure ring is connected to the bottom of the combined packing. The combined packing includes one or more combinations of nickel-based alloy powder, metal wire, and flexible graphite.

[0013] In one embodiment, an annular stepped groove is formed on the outer circumferential surface of the pressure ring, and a connecting four-ring is formed in the cavity corresponding to the annular stepped groove. The four-ring design can offset the large pressure impact on the combined packing and prevent the valve stem from being punched out or falling off.

[0014] In one embodiment, the valve body further includes a valve seat made of carbon graphite, the valve body being made of titanium alloy, and the valve body having a C-shaped cross-section. When closed, the annular surfaces of the valve body and the valve seat are sealed together.

[0015] In one embodiment, the valve seat is connected to a gasket via valve seat packing and to the valve cover via the gasket.

[0016] Compared with the prior art, the beneficial effects of this utility model include at least the following:

[0017] The valve stem and ball are designed to be coaxial, eliminating the complex movement trajectory of an eccentric valve and reducing the risk of particle embedding between the valve seat and the ball. This makes it suitable for media containing trace amounts of solids and improves the stability of the valve body. In addition, the connecting cover allows the elastic plate to elastically abut against the combined packing. The elastic plate in the middle can provide sufficient pressure to compress the combined packing, ensuring that the combined packing is always sealed to the periphery of the valve stem and maintains a high level of sealing. It can also withstand large pressure shocks, preventing the valve stem from being pushed out or falling off. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the cross-sectional structure of the ball valve according to an embodiment of the present invention.

[0019] In the diagram: 1. Valve body; 11. Valve cavity; 2. Ball; 3. Valve stem; 31. Handle; 32. First connecting part; 33. Second connecting part; 4. Combined packing; 5. Elastic sheet; 6. Connecting cover; 7. Adjusting bolt; 8. Pressure sleeve; 81. Pressure ring; 82. Four-open ring; 9. Valve seat; 91. Valve cover; 92. Washer; 93. Valve seat packing. Detailed Implementation

[0020] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to make the present invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore repeated descriptions of them will be omitted.

[0021] The terms used to describe position and direction in this utility model are illustrated with the accompanying drawings, but changes can be made as needed, and all such changes are included within the scope of protection of this utility model.

[0022] Reference Figure 1 This utility model provides a one-piece titanium alloy hard seal plus high carbon graphite non-eccentric C-type ball valve, comprising:

[0023] A valve body 1 has two ends for connecting pipes. Inside, there is a valve cavity 11 and a rotating ball 2 rotatably connected within the valve cavity 11. The rotating ball 2 can rotate along its axis to close or open the pipes at both ends. The axis of the rotating ball 2 is perpendicular to the axes of the two ends of the valve body 1. A cavity is formed on the valve body 1. Cylindrical pipe ends are provided at both ends of the valve body 1 for connecting pipes of matching shape and size on both sides. The rotating ball 2 can cut off or connect the two ends.

[0024] The valve stem 3 is also connected to the periphery by a flange, which has a high degree of matching of the sealing surface and strong adaptability, making it especially suitable for high pressure or frequent disassembly scenarios.

[0025] The valve stem 3 connects the rotating ball 2 to the handle 31 on its outer top. The valve stem 3 is rotatably connected within the pipe cavity. The valve stem 3 includes a first connecting part 32 and a second connecting part 33 that are coaxially connected to each other. The diameter of the first connecting part 32 is larger than the diameter of the second connecting part 33. An annular stepped surface is formed on the first connecting part 32. The valve stem 3 is thicker at the bottom and thinner at the top. An annular stepped surface exists between the first connecting part 32 and the second connecting part 33. The annular stepped surface is pressed down by the connecting cover 6, which in turn elastically abuts against and compacts the combined packing 4 via an elastic sheet 5. The combined packing 4 can be pressed tightly onto the annular stepped surface.

[0026] An adjustable packing assembly includes a combined packing 4, an elastic plate 5, and a connecting cover 6. The connecting cover 6 elastically abuts against the combined packing 4, which is filled between the circumference of the valve stem 3 and the annular stepped surface, via the elastic plate 5. Under pressure, the elastic plate 5 and the connecting cover 6 can always provide sufficient elastic pressure to prevent the medium inside the valve body 1 from flowing out through the gap between the valve stems 3 due to thermal expansion and contraction. Furthermore, it can counteract large pressure shocks that could cause the valve stem 3 to be ejected or detached.

[0027] In one embodiment, the connecting cover 6 is pierced by an adjusting bolt 7 for adjusting the pressure of the connecting cover 6 on the combined packing 4. The adjusting bolt 7 can be rotated to adjust the pressure of the bottom connecting cover 6, thereby adjusting the pressure of the elastic plate 5 on the combined packing 4, thus preventing the valve body 1 from being affected by thermal expansion and contraction, which could cause the combined packing 4 to lose its sealing function.

[0028] In one embodiment, a pressure sleeve 8 is connected to the top of the combined packing 4, and a pressure ring 81 is connected to the bottom of the combined packing 4. The combined packing 4 includes one or more combinations of nickel-based alloy powder, metal wire, and flexible graphite. The combined packing 4 can be a mixture of nickel-based alloy powder and metal wire, compacted together, and flexible graphite can even be added according to specific proportions. The flexible graphite provides lubrication, enhancing both the sealing performance of the valve stem 3 and providing lubrication.

[0029] In one embodiment, an annular stepped groove is formed on the outer circumferential surface of the pressure ring 81, and a connecting four-ring 82 is formed in the cavity corresponding to the annular stepped groove. The structural design of the four-ring 82 stably supports the combined packing 4, preventing it from moving along the axial direction of the valve stem 3. The design of the four-ring 82 can offset the large pressure impact on the combined packing 4 and prevent the valve stem 3 from being ejected or detached.

[0030] In one embodiment, a valve seat 9 is also included. The valve seat 9 is made of carbon graphite, and the valve body 1 is made of titanium alloy. The valve body 1 has a C-shaped cross-section. When closed, the annular surfaces of the valve body 1 and the valve seat 9 are sealed together. The valve seat 9, made of carbon graphite, provides self-lubrication during use. The C-shaped hemispherical shape of the valve body 1 meets the requirements of lightweight design, while the V-shaped cut design can cut fibers and particles to prevent slurry and crystallization media from clogging, such as paper pulp and mineral slurry.

[0031] Furthermore, the titanium alloy material exhibits extremely strong corrosion resistance to seawater, chloride ions, strong acids (such as hydrochloric acid and sulfuric acid), and alkaline media, far exceeding that of stainless steel and ordinary alloys, making it suitable for corrosive environments such as chemical and marine engineering fields. The carbon graphite valve seat demonstrates strong stability in high temperatures or corrosive gases, preventing failures caused by chemical corrosion of ordinary rubber or PTFE valve seats. The erosion resistance of the titanium alloy combined with the self-lubricating properties of carbon graphite significantly extends the valve's service life.

[0032] In one embodiment, the valve seat 9 is connected to a gasket via valve seat packing 93, and to the valve cover via the gasket. The valve seat 9 presses the packing together with the gasket, and the valve seat 9 fits tightly with the connecting gasket, enabling the valve seat 9 to be stably and sealingly connected to the rotating ball 2, thereby improving the sealing degree of the valve body 1. The valve seat packing 93 can be made with the same formula as the packing described above, which will not be elaborated further here.

[0033] The valve body 1 and valve cover 2 are equipped with a spiral wound graphite gasket sealing structure. If a fire occurs in the environment around the valve, the valve can also achieve a sealing effect through the spiral wound graphite gasket.

[0034] The concentric design of this utility model features a ball 2 that is coaxial with the valve stem 3, and the valve seat 9 is in full contact with the ball 2. When closed, the sealing pre-tightening force is uniform, and the leakage level can reach ANSI VI (soft seal).

[0035] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and alterations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention, and all such changes should fall within the protection scope of the claims of the present invention.

Claims

1. A one-piece titanium alloy hard seal with high-carbon graphite non-eccentric C-type ball valve, characterized in that, include: A valve body, with both ends for connecting pipes, has a valve cavity inside and a rotating ball rotatably connected inside the valve cavity. The rotating ball can rotate along an axis to close or open the pipes at both ends. The axis of the rotating ball is perpendicular to the axes of both ends of the valve body, and a cavity is formed on the valve body. The valve stem, the rotating ball is connected to the handle on the outer top through the valve stem, the valve stem is rotatably connected in the cavity, the valve stem includes a first connecting part and a second connecting part that are coaxially designed to be connected to each other, the diameter of the first connecting part is larger than the diameter of the second connecting part, and an annular stepped surface is formed on the first connecting part; An adjustable packing assembly includes a combined packing, an elastic sheet, and a connecting cover. The connecting cover elastically abuts against the combined packing filled between the valve stem periphery and the annular stepped surface via the elastic sheet.

2. The one-piece titanium alloy hard seal plus high-carbon graphite non-eccentric C-type ball valve according to claim 1, characterized in that, The connecting cover is pierced by adjusting bolts to adjust the pressure of the connecting cover on the combined packing.

3. The one-piece titanium alloy hard seal plus high-carbon graphite non-eccentric C-type ball valve according to claim 2, characterized in that, The top of the combined packing is also connected to a pressure sleeve, and the bottom of the combined packing is also connected to a pressure ring. The combined packing includes one or more combinations of nickel-based alloy powder, metal wire, and flexible graphite.

4. The one-piece titanium alloy hard seal plus high-carbon graphite non-eccentric C-type ball valve according to claim 3, characterized in that, An annular stepped groove is formed on the outer circumferential surface of the pressure ring, and a connecting four-open ring is formed in the cavity corresponding to the annular stepped groove to prevent the valve stem from being ejected or falling off.

5. The one-piece titanium alloy hard seal plus high-carbon graphite non-eccentric C-type ball valve according to claim 1, characterized in that, It also includes a valve seat, which is made of carbon graphite, and a valve body, which is made of titanium alloy. The valve body has a C-shaped cross-section, and when closed, the annular surfaces of the valve body and the valve seat are sealed together.

6. The one-piece titanium alloy hard seal plus high-carbon graphite non-eccentric C-type ball valve according to claim 5, characterized in that, The valve seat is connected to the gasket via valve seat packing, and the valve cover is connected via the gasket.

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