Sleeve regulating valve

Abstract

The application provides a sleeve adjusting valve which can improve the valve sealing property by medium pressure without increasing the valve driving cost. The sleeve adjusting valve comprises a valve body, a sleeve, a valve core, a valve seat, a medium inlet, an inlet one, a sleeve interior, an outlet one and a medium outlet which are sequentially communicated to form a medium channel one when the valve is opened. The valve core comprises a large valve core, a small valve core and a supporting plate structure. When the large valve core is located at the lowermost end, the bottom of the large valve core is in contact with the valve seat to form a sealing structure one, and the sealing structure one blocks the medium channel one. When the large valve core is located at the lowermost end and the small valve core is not located at the lowermost end, the medium inlet, the gap between the inlet one and the inner wall of the sleeve, the outer wall of the large valve core, the flow-through hole one at the top of the small valve core, the flow-through hole two at the bottom of the large valve core, the outlet one and the medium outlet are sequentially communicated to form a medium channel two. When the small valve core is located at the lowermost end, the large valve core and the small valve core are in contact to form a sealing structure two, and the sealing structure two blocks the medium channel two.

Description

Technical Field

[0001] This invention relates to the field of valve technology, specifically to a sleeve regulating valve. Background Technology

[0002] Generally, metal-sealed control valves can only achieve an ANSI CLASS 4 or ANSI CLASS 5 leakage rating. However, some critical control valves in thermal power plants, such as those in boiler feedwater pump circulation systems, are used in high-temperature, high-pressure, and long-term closed applications, requiring virtually no leakage. Otherwise, under high pressure, even a tiny leak in the valve seat can cause cavitation, eroding the valve core and seat, and eventually damaging the internal valve components. Therefore, valve sealing is extremely important for valves in such applications. Furthermore, some control valves in critical parts of control systems also have strict sealing requirements; otherwise, abnormal system operation or wasted resources (materials) and reduced production efficiency may occur.

[0003] To improve the sealing performance of valves, traditional control valves use increased thrust to press the valve core and valve seat more tightly. However, increasing the thrust requires increasing the cost of the drive components, which leads to an increase in valve drive costs. Summary of the Invention

[0004] To address the issue that increasing the driving force of traditional control valves to improve sealing leads to increased valve driving costs, this invention provides a sleeve control valve that can improve valve sealing performance through medium pressure without increasing valve driving costs.

[0005] The technical solution is as follows: a sleeve regulating valve, comprising a valve body, a sleeve, a valve core, and a valve seat. The sleeve is hollow and has an inlet and an outlet. The valve body has a medium inlet and a medium outlet. When the valve is opened, the medium inlet, inlet 1, the inside of the sleeve, outlet 1, and medium outlet are sequentially connected to form a medium channel 1. The valve core is connected to a driving device and extends into the sleeve from the top. The valve core comprises a large valve core, a small valve core, and a support plate structure. When the large valve core is at the bottom, its bottom contacts the valve seat to form a sealing structure 1, and the sealing structure 1 blocks the medium channel 1.

[0006] The small valve core is located inside the large valve core and can move up and down relative to the large valve core. The small valve core is connected to the driving device and the support plate structure. The support plate structure is used to drive the large valve core to move upward. When the large valve core is at the bottom and the small valve core is not at the bottom, the medium inlet, inlet one, the gap between the outer wall of the large valve core and the inner wall of the sleeve, the flow hole one at the top of the small valve core, the flow hole two at the bottom of the large valve core, outlet one, and medium outlet are sequentially connected to form medium channel two. When the small valve core is at the bottom, the large valve core and the small valve core contact to form sealing structure two, and sealing structure two blocks medium channel two.

[0007] Its further features are:

[0008] The inlet is located at the lower part of the side of the sleeve, and the outlet is located at the bottom of the sleeve; the large valve core has an H-shaped cross-section, which includes a cylindrical vertical outer wall and a horizontal plate located inside it, and a connecting hole is opened in the middle of the horizontal plate; the diameter of the upper part of the outer side of the large valve core is smaller than the diameter of the lower part of the outer side of the large valve core; the small valve core has a T-shaped cross-section, which includes a sealing plate located at the top horizontally and a vertical connecting rod; the sealing plate is located above the horizontal plate, and the connecting rod passes through the connecting hole and connects to the support plate of the support plate structure located below the horizontal plate;

[0009] The support plate structure includes a connecting nut and the support plate, the width of which is greater than the diameter of the connecting hole; the connecting rod is a stepped shaft, which includes a stepped surface one, a stepped surface two, and a threaded section at its lower end arranged sequentially from top to bottom. The stepped surface one is used to contact the horizontal plate of the large valve core to form the sealing structure two, the stepped surface two is used to limit the position of the support plate, and the threaded section is used to install the connecting nut.

[0010] The outer diameter of the sealing plate corresponds to the inner diameter of the top of the large valve core. A flow hole one is provided on the sealing plate, and a flow hole two is provided on the horizontal plate. A flow gap is left between the bottom of the sealing plate and the top of the horizontal plate. The flow gap connects the flow hole one and the flow hole two. The sealing structure two is located within the flow gap.

[0011] A spring is installed between the small valve core and the large valve core to ensure that the large valve core contacts the support plate during the opening or closing of the valve;

[0012] The driving device includes a valve stem and an output mechanism for driving the valve stem to move up and down, and the valve stem is connected to the small valve core.

[0013] It also includes a valve cover, which is located above the valve body and the sleeve and is connected to the valve body and the sleeve respectively, and the valve stem passes through the valve cover;

[0014] A packing gap is provided between the valve stem and the valve cover. From bottom to top, a packing liner, packing, a packing spacer, packing, and a packing pressure sleeve are arranged in the packing gap, and a packing pressure cover is pressed onto the packing pressure sleeve.

[0015] The beneficial effects of the present invention are as follows: when the valve is closed, sealing structure one and sealing structure two simultaneously block medium channel one and medium channel two, but the medium can still diffuse through the blocked medium channel two to the top of the valve core and the sealing structure two, generating an unbalanced force through the medium pressure difference, increasing the sealing specific pressure of the valve seat and the valve core, and improving the sealing effect. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the invention when the valve is fully open;

[0017] Figure 2 This is a schematic diagram of the invention when the valve is initially closed (initially opened);

[0018] Figure 3 This is a schematic diagram of the invention when the valve is fully closed;

[0019] Figure 4 for Figure 2 Enlarged view of point B in the middle;

[0020] Figure 5 for Figure 2 Enlarged schematic diagram at point C (arrows in the diagram indicate the direction of medium flow);

[0021] Figure 6 for Figure 3 Enlarged view of point D;

[0022] Figure 7 This is a schematic diagram of the cross-sectional structure of the large valve core;

[0023] Figure 8 This is a cross-sectional schematic diagram of the small valve core and support plate structure;

[0024] Figure 9 for Figure 2 Enlarged diagram of point F in the middle. Detailed Implementation

[0025] like Figures 1-3 The sleeve regulating valve shown includes a valve body 1, a sleeve 2, a valve core 3, and a valve seat 4. The sleeve 2 is hollow and has an inlet 201 and an outlet 202. The valve body 1 has a medium inlet 101 and a medium outlet 102. When the valve is opened, it acts as a medium inlet. Figure 1As shown, the medium inlet 101, inlet 201, sleeve interior, outlet 202, and medium outlet 102 are sequentially connected to form a medium channel. The medium flows through the medium channel. The valve core 3 is connected to the drive device 5 and extends into the sleeve 2 from the top. The valve core 3 includes a large valve core 301, a small valve core 302, and a support plate structure 303. When the large valve core 301 is at the bottom, its bottom contacts the valve seat 4 to form a sealing structure A, and the sealing structure A blocks the medium channel. The small valve core 302 is located inside the large valve core 301 and can move up and down relative to the large valve core 301. The small valve core 302 is connected to the drive device 5 and to the support plate structure 303. The support plate structure 303 is used to drive the large valve core 301 to move upward. When the large valve core 301 is at the bottom and the small valve core 302 is not at the bottom, it is as follows: Figure 2 As shown, the gap 203 between the outer wall of the medium inlet 101, inlet 201, and large valve core 301 and the inner wall of the sleeve (e.g.) Figure 4 As shown), the flow hole 3021 at the top of the small valve core 302, the flow hole 3011 at the bottom of the large valve core 301, the outlet 202, and the medium outlet 102 are sequentially connected to form a medium channel two (as shown). Figure 5 (As shown by the middle arrow); when the small valve core 302 is at the lowest end, the large valve core 301 and the small valve core 302 contact to form a sealing structure E (as shown by the middle arrow). Figure 6 As shown), and the sealing structure 2E blocks the medium channel 2.

[0026] Its specific structure is as follows: inlet 201 is located on the lower side of sleeve 2, and outlet 202 is located at the bottom of sleeve 2; combined with Figure 7 As shown, the large valve core 301 has an H-shaped cross-section, including a cylindrical vertical outer wall 3012 and a horizontal plate 3013 located inside it. A connecting hole 3014 is provided in the middle of the horizontal plate 3013. The diameter of the upper part of the outer surface of the large valve core 301 is smaller than the diameter of the lower part of the outer surface of the large valve core, which is used to form a gap 203; combined with Figure 8As shown, the small valve core 302 has a T-shaped cross-section, which includes a horizontal sealing plate 3022 at the top and a vertical connecting rod 3023. The sealing plate 3022 is located above the horizontal plate 3013, and the connecting rod 3023 passes through the connecting hole 3014 and connects to the support plate 3031 of the support plate structure 303 located below the horizontal plate 3013. The pallet structure 303 includes a connecting nut 3032, a pallet 3031, and a gasket located between them. The width of the pallet 3031 is greater than the diameter of the connecting hole 3014, thereby avoiding passing through the connecting hole 3014 of the large valve core. The connecting rod 3023 is a stepped shaft, which includes a stepped surface 1 30231, a stepped surface 2 30232, and a threaded section 30233 located at its lower end, arranged sequentially from top to bottom. The stepped surface 1 30231 is used to contact the horizontal plate 3013 of the large valve core 301 to form a sealing structure 2E. The stepped surface 2 30232 is used to limit the position of the pallet 3031. The threaded section 30233 is used to install the connecting nut 3032, so that the pallet can be fixed by tightening the connecting nut.

[0027] When using it, first, when the valve is fully open, then combine... Figure 1 The valve core assembly has a balanced structure. Since there is no gap between the large valve core and the sleeve at this time (the large valve core is at the top), the medium does not move upward. At the same time, the pressure of the valve core is balanced. When closed, only a small thrust is needed to move the valve core downward, while the medium flows normally through the medium channel.

[0028] When closing, the valve core assembly is moved downwards by the drive device. During this downward movement, the large valve core first contacts the valve seat to form a sealing structure, blocking the medium passage and achieving initial valve closure (e.g., Figure 2 As shown), when the above process is completed, it is necessary to prevent the medium from pushing the large valve core upward during the closing process and to ensure that the sealing structure two is always open. Although the above operation can be achieved by the gravity of the large valve core, in order to ensure effectiveness, a spring 6 is placed between the small valve core and the large valve core. The spring 6 keeps the large valve core in contact with the support plate during the initial closing process. During the initial closing, the medium channel two is open, and the medium can flow through the medium channel two. At this time, the valve core assembly is still a balanced structure.

[0029] Continue to drive the device, compressing the spring, closing the second sealing structure, and blocking the second medium channel (such as...). Figure 3 As shown in the diagram, the large valve core and seat remain closed and sealed. At this point, the valve core assembly becomes an unbalanced structure. The medium pressure above and below the large valve core is different; this pressure difference generates an unbalanced force, increasing the sealing pressure between the valve core and seat, thus improving the sealing effect.

[0030] When enabled, see Figure 2When the valve is initially opened, the drive device applies an upward force to open the small valve core first. Because the small valve core is small in size, the unbalanced force of the medium is small, and the required thrust is small. The large valve core and valve seat are still closed and sealed. At this time, the valve core assembly has become a balanced structure, and the medium pressure above and below the large valve core is the same. At this time, a smaller upward force can be used to continue to open the large valve core and realize the full opening of the valve.

[0031] By employing a large and small valve core structure, the medium pressure can be used to press the valve core and valve seat more tightly when closed, improving the sealing effect. When opening, the small valve core opens first, and the pressure of the large valve core is balanced, requiring only a small force to open. This structure can balance low thrust and high sealing performance, making it easy to use.

[0032] In addition, the outer diameter of the sealing plate 3022 corresponds to the inner diameter of the top of the large valve core 301. A first flow hole 3021 is provided on the sealing plate 3022, penetrating the sealing plate 3022. A second flow hole 3011 is provided on the horizontal plate 3013, penetrating the horizontal plate 3013, ensuring that the medium can only enter through the flow holes. A flow gap 304 is left between the bottom of the sealing plate 3022 and the top of the horizontal plate 3013, connecting the first flow hole 3021 and the second flow hole 3011. The second sealing structure is located within the flow gap 304. Figure 2 , Figure 5 The driving device includes a valve stem 501 and an output mechanism (e.g., a cylinder) for driving the valve stem 501 to move up and down. The valve stem 501 is connected to the small valve core 302. The regulating valve also includes a valve cover 7, which is located above the valve body 1 and the sleeve 2 and is connected to the valve body 1 and the sleeve 2 respectively. The valve stem 501 passes through the valve cover 7.

[0033] To ensure a tight seal between the valve stem and the valve cover, a packing gap is provided between the valve stem 501 and the valve cover 7. Figure 9 As shown, from bottom to top, the packing gap is provided with a packing liner 801, a packing 802, a packing spacer 803, a packing, and a packing pressure sleeve 804, with a packing gland 805 pressing on the packing pressure sleeve 804.

[0034] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A sleeve regulating valve, comprising a valve body, a sleeve, a valve core, and a valve seat, wherein the sleeve is hollow and has an inlet and an outlet, and the valve body has a medium inlet and a medium outlet; when the valve is opened, the medium inlet, inlet one, the inside of the sleeve, outlet one, and medium outlet are sequentially connected to form a medium channel one; the valve core is connected to a driving device and extends into the sleeve from the top of the sleeve, characterized in that: The valve core comprises a big valve core, a small valve core and a supporting plate structure, when the big valve core is at the lowest end, its bottom contacts with the valve seat to form a sealing structure I, and the sealing structure I blocks the medium channel I; The small valve core is located in the big valve core and can move up and down relative to the big valve core, the small valve core is connected with the driving device and the supporting plate structure, the supporting plate structure is used to drive the big valve core to move upward, when the big valve core is at the lowest end and the small valve core is not at the lowest end, the medium inlet, the gap between the inlet I, the outer wall of the big valve core and the inner wall of the sleeve, the flow hole I at the top of the small valve core, the flow hole II at the bottom of the big valve core, the outlet I and the medium outlet are sequentially communicated to form a medium channel II; when the small valve core is at the lowest end, the big valve core and the small valve core contact to form a sealing structure II, and the sealing structure II blocks the medium channel II; The inlet I is located at the lower part of the side of the sleeve, the outlet I is located at the bottom of the sleeve; the cross section of the big valve core is H-shaped, which comprises a vertical outer wall in a cylindrical shape and a horizontal plate inside, a connecting hole is formed in the middle of the horizontal plate, the diameter of the upper part of the outer side of the big valve core is smaller than the diameter of the lower part of the outer side of the big valve core; the cross section of the small valve core is T-shaped, which comprises a vertical connecting rod and a horizontal sealing plate at the top, the sealing plate is located above the horizontal plate, the connecting rod passes through the connecting hole and is connected with the supporting plate of the supporting plate structure below the horizontal plate; The supporting plate structure comprises a connecting nut and the supporting plate, the width of the supporting plate is greater than the diameter of the connecting hole; the connecting rod is a stepped shaft, which comprises a stepped surface I, a stepped surface II and a threaded segment at the lower end, the stepped surface I is used to contact with the horizontal plate of the big valve core to form the sealing structure II, the stepped surface II is used to limit the supporting plate, and the threaded segment is used to install the connecting nut; The outer diameter of the sealing plate corresponds to the inner diameter of the top of the big valve core, the flow hole I penetrating the sealing plate is formed on the sealing plate, the flow hole II penetrating the horizontal plate is formed on the horizontal plate, a flow gap is left between the sealing plate below and the horizontal plate above, the flow gap communicates the flow hole I and the flow hole II, and the sealing structure II is located in the flow gap; When the valve is closed, the sealing structure I and the sealing structure II simultaneously block the medium channel I and the medium channel II, the medium still diffuses to the valve core above and the sealing structure II through the blocked medium channel II, an unbalanced force is generated by the pressure difference of the medium, and the sealing specific pressure of the valve seat and the valve core is increased.

2. The sleeve valve according to claim 1, wherein: A spring is installed between the small valve core and the big valve core, which is used to ensure that the big valve core contacts with the supporting plate during the process of opening or closing the valve.

3. The sleeve valve according to any one of claims 1-2, wherein: The driving device comprises a valve rod and an output mechanism for driving the valve rod to move up and down, the valve rod is connected with the small valve core.

4. The sleeve valve according to claim 3, wherein: It also comprises a valve cover, the valve cover is located above the valve body and the sleeve and is connected with the valve body and the sleeve respectively, and the valve rod passes through the valve cover.

5. The sleeve valve according to claim 4, wherein: A packing gap is arranged between the valve stem and the valve cover, and a packing gasket, a packing, a packing spacer sleeve, a packing, a packing pressing sleeve and a packing pressing cover are sequentially arranged in the packing gap from bottom to top.

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