Balanced cage type regulating valve

Abstract

The utility model relates to the technical field of regulating valves, in particular to a balance cage type regulating valve. The balance cage type regulating valve comprises a valve body, a fluid channel is formed in the valve body, a sleeve is arranged in the valve body, a fluid through hole is formed in the sleeve, an upper valve deck is arranged on the valve body, a valve element rod is arranged on the upper valve deck in a sliding and penetrating mode, a valve element is arranged on the valve element rod, the valve element is connected into the sleeve in a sliding mode, and a fluid balance cavity is formed between the valve element and the upper valve deck. A first sealing pair and a second sealing pair are arranged between the sleeve and the valve element, the first sealing pair is located on the side, away from the upper valve deck, of the fluid through hole, the second sealing pair is located on the side, close to the upper valve deck, of the fluid through hole, a limiting ring groove is formed in the outer side wall of the top of the valve element in the circumferential direction, and the second sealing pair comprises a C-shaped metal sealing ring. The C-shaped metal sealing ring is clamped in the limiting ring groove in a limited mode, an opening of the C-shaped metal sealing ring faces the bottom of the limiting ring groove, the C-shaped metal sealing ring is connected with the inner wall of the sleeve in a sealed mode, the sealing effect is good, and the production cost is low.

Description

Technical Field

[0001] This utility model relates to the technical field of regulating valves, specifically to a balanced cage regulating valve. Background Technology

[0002] The balanced cage control valve, also known as a pressure-balanced control valve, uses a sleeve-guided pilot-operated valve core. It primarily utilizes fluid pressure to achieve rapid valve core actuation with low operating force. Furthermore, it employs a single-seat seal, resulting in high accuracy of the flow characteristic curve, conforming to IEC534-1 standards. The balanced cage control valve offers good dynamic stability, low noise, and cavitation prevention, making it suitable for controlling high-pressure differential fluids at various temperatures. Equipped with multi-spring diaphragm actuators or electric actuators, it features a compact structure and high output force.

[0003] Because balanced cage control valves often encounter high-temperature conditions, to improve the sealing effect at high temperatures, single-seat seals are often modified to double-seat seals, with double-seat seals being a common form. However, since metal seals involve two metal surfaces, when machining a single-metal seal, only the sealing between the two metal surfaces of that group needs to be considered. But when machining a double-metal seal, not only the sealing between the two metal surfaces of the current group needs to be considered, but also whether the two metal surfaces of the other group can simultaneously seal with the two metal surfaces of the current group. This directly involves the fit between the double-metal seals, requiring extremely high machining precision. Therefore, balanced cage control valves manufactured with low machining precision have poor sealing performance, which increases production costs. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a balanced cage type regulating valve with good sealing effect and low production cost.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] This utility model provides a balanced cage-type regulating valve, including a valve body with a fluid channel inside. A sleeve is provided inside the valve body, and a fluid through hole is opened on the sleeve. An upper valve cover is provided on the valve body, and a valve core rod is slidably inserted through the upper valve cover. A valve core is provided on the valve core rod and is slidably connected inside the sleeve. A fluid balance cavity is formed between the valve core and the upper valve cover. A first sealing pair and a second sealing pair are provided between the sleeve and the valve core. The first sealing pair is located on the side of the fluid through hole away from the upper valve cover, and the second sealing pair is located on the side of the fluid through hole closer to the upper valve cover. A limiting ring groove is circumferentially formed on the top outer wall of the valve core. The second sealing pair includes a C-shaped metal sealing ring, which is limited and engaged in the limiting ring groove. The opening of the C-shaped metal sealing ring faces the bottom of the limiting ring groove, and the C-shaped metal sealing ring is sealed to the inner wall of the sleeve.

[0007] By adopting the above technical solution, when processing the balance cage control valve, for the second sealing pair, it is only necessary to open a limiting ring groove on the valve core and then limit and snap the C-type metal sealing pair into the limiting ring groove 12. There is no need to consider the problem of double metal sealing between the first sealing pair and the second sealing pair. Therefore, the processing difficulty is greatly reduced, which can effectively improve the sealing effect of the balance cage control valve and improve the processing efficiency, thereby reducing the production cost of the balance cage control valve.

[0008] Optionally, the C-shaped metal sealing ring is made of stainless steel.

[0009] By adopting the above technical solutions, stainless steel has good corrosion resistance, and C-type metal sealing rings made of stainless steel can adapt to a variety of chemical environments.

[0010] Optionally, the C-type metal sealing ring is made of a nickel-based high-temperature alloy.

[0011] By adopting the above technical solutions, nickel-based high-temperature alloy materials have good high-temperature resistance and corrosion resistance, and C-type metal sealing rings made of nickel-based high-temperature alloy materials are suitable for harsh working conditions with high temperature and high pressure.

[0012] Optionally, the C-type metal sealing ring is made of copper alloy.

[0013] By adopting the above technical solution, the C-type metal sealing ring made of copper alloy has good elasticity and conductivity.

[0014] Optionally, the first sealing pair includes a first metal surface and a second metal surface. The first metal surface is located on the inner edge of the bottom of the sleeve, and the second metal surface is located on the outer edge of the bottom of the valve core. The first metal surface and the second metal surface are fitted together for sealing.

[0015] By adopting the above technical solution, the fluid channel can be effectively cut off through the bonding of the first metal surface and the second metal surface.

[0016] Optionally, a first limiting part is provided in the valve body, and a first supporting part is provided on the bottom outer edge of the sleeve, the first supporting part abutting against the first limiting part; a second limiting part is provided on the valve body, and a second supporting part is provided on the top outer edge of the sleeve abutting against the second limiting part.

[0017] By adopting the above technical solution, the sleeve can be fixed in the valve body through the cooperation between the support part and the limiting part.

[0018] Optionally, a metal spiral wound pad is provided between the first limiting part and the first supporting part.

[0019] By adopting the above technical solution, a seal can be achieved between the first limiting part and the first supporting part by setting a metal spiral wound gasket.

[0020] Optionally, a first toothed gasket is provided between the second limiting part and the second supporting part.

[0021] By adopting the above technical solution, a seal can be achieved between the second limiting part and the second supporting part by setting the first toothed gasket.

[0022] Optionally, the upper valve cover is provided with a pressing part, which presses against the second support part.

[0023] By adopting the above technical solution, the pressing part can press down the second support part, thereby ensuring the tightness of the connection between the valve body and the sleeve.

[0024] Optionally, a second toothed gasket is provided between the pressing part and the second supporting part.

[0025] By adopting the above technical solution, the second toothed gasket can improve the sealing effect of the upper opening of the valve body.

[0026] In summary, this utility model has at least the following beneficial technical effects:

[0027] When machining a balanced cage control valve, only one set of metal surfaces needs to be machined, and a C-type metal sealing ring needs to be set on the valve core. There is no need to consider the fit between the two sets of metal surfaces, so the machining difficulty is greatly reduced, which can effectively improve the sealing effect of the balanced cage control valve and improve machining efficiency, thereby reducing the production cost of the balanced cage control valve. Attached Figure Description

[0028] Figure 1 This is a cross-sectional schematic diagram of a balanced cage control valve.

[0029] Figure 2 for Figure 1 Enlarged view of section A.

[0030] Figure 3 for Figure 1 Enlarged view of section B.

[0031] Figure 4 This is a schematic diagram showing the positions of the seals in a balanced cage control valve.

[0032] Explanation of reference numerals in the attached drawings: 1. Valve body; 2. Sleeve; 3. Upper valve cover; 4. Valve core rod; 5. Valve core; 6. Fluid passage; 7. Fluid through hole; 8. Fluid balance cavity; 9. First metal surface; 10. Second metal surface; 11. C-type metal sealing ring; 12. Limiting ring groove; 13. First limiting part; 14. Second limiting part; 15. First support part; 16. Second support part; 17. Metal spiral wound gasket; 18. First toothed gasket; 19. Pressing part; 20. Second toothed gasket. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0034] The terminology used in the following embodiments of this utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used in the specification and appended claims of this utility model, the singular expressions “a,” “an,” “the,” “the,” “the,” and “this” are intended to include the plural expressions as well, unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this utility model refers to and includes any or all possible combinations of one or more of the listed items. The term “exemplary” means “serving as an example, embodiment, or illustration,” and any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments. The terms “first” and “second” are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of indicated technical features. Thus, a feature defined as “first” or “second” may explicitly or implicitly include one or more of that feature, and in the description of embodiments of this utility model, unless otherwise stated, “a plurality” means two or more.

[0035] This embodiment provides a balanced cage regulating valve.

[0036] refer to Figure 1A balanced cage type regulating valve includes: valve body 1, sleeve 2, upper valve cover 3, valve core rod 4, valve core 5, first sealing pair and second sealing pair.

[0037] The valve body 1 has a fluid channel 6 for media flow. A sleeve 2 is located inside the valve body 1 and situated on the fluid channel 6. The sleeve 2 has a fluid through-hole 7 for media flow. An upper valve cover 3 is mounted on the valve body 1, and a valve core rod 4 slides through the upper valve cover 3. The sliding contact between the valve core rod 4 and the upper valve cover 3 is sealed with a seal. A valve core 5 is mounted on the valve core rod 4 and slidably connected within the sleeve 2. The valve core 5 controls the opening of the balanced cage control valve. A fluid balance cavity 8 is formed between the valve core 5 and the upper valve cover 3, which reduces the unbalanced force exerted by the media on the valve core 5. The valve core rod 4 can be connected to a drive device. The drive device moves the valve core rod 4 up and down, which in turn moves the valve core 5 up and down within the sleeve 2. The valve core 5 controls the opening size of the flow through-hole, thereby controlling the flow rate of the media in the flow channel and ultimately controlling the opening of the balanced cage control valve.

[0038] Both the first and second sealing pairs are located between the sleeve 2 and the valve core 5. The first sealing pair is located on the side of the fluid passage 7 away from the upper valve cover 3, and the second sealing pair is located on the side of the fluid passage 7 closer to the upper valve cover 3. The first sealing pair is used to improve the sealing effect of the valve core 5 blocking the fluid passage 6, and the second sealing pair is used to improve the sealing effect on the fluid balance cavity 8 when the valve core 5 blocks the fluid passage 6.

[0039] refer to Figure 3 The first sealing pair includes a first metal surface 9 and a second metal surface 10. The first metal surface 9 is located on the inner edge of the bottom of the sleeve 2 and is below the fluid passage 7. The second metal surface 10 is located on the outer edge of the bottom of the valve core 5. When the balance cage regulating valve is fully closed, the first metal surface 9 and the second metal surface 10 adhere and seal, thereby cutting off the fluid passage 6.

[0040] refer to Figure 2The second sealing pair includes a C-shaped metal sealing ring 11, the cross-section of which is C-shaped. A limiting annular groove 12 is circumferentially formed on the outer side wall of the top of the valve core 5. The C-shaped metal sealing ring 11 is limited and engaged within the limiting annular groove 12, with its opening facing the bottom of the groove 12. The C-shaped metal sealing ring 11 is sealed to the inner wall of the sleeve 2. It should be understood that the limiting engagement ensures that the C-shaped metal sealing ring 11 is compressed by the limiting annular groove 12, thus ensuring that the C-shaped metal sealing ring 11 exerts force on the inner wall of the sleeve 2. The sealing connection is an abutment, ensuring the abutment force between the C-shaped metal sealing ring 11 and the sleeve 2, thereby ensuring the sealing effect. The abutment point is located on the side of the fluid passage 7 near the upper valve cover 3, thereby sealing the fluid balance cavity 8.

[0041] The C-type metal seal ring 11 can be made of stainless steel, such as 304 stainless steel or 317 stainless steel. These types of stainless steel have good corrosion resistance, which allows the C-type metal seal ring 11 made of this material to adapt to a variety of chemical environments.

[0042] The C-type metal seal 11 can also be made of copper alloy, such as beryllium bronze. C-type metal seals 11 made of this type of copper alloy have good elasticity and conductivity.

[0043] The C-type metal seal 11 can also be made of nickel-based alloys, such as the Inconel series. C-type metal seals 11 made of these materials have good high-temperature resistance and corrosion resistance, making them suitable for harsh working conditions such as high temperature and high pressure. It should be understood here that "nickel-based alloy" is an abbreviation for nickel-based high-temperature alloys, which include, but are not limited to, nickel-copper alloys, nickel-chromium alloys, nickel-molybdenum alloys, and nickel-chromium-molybdenum alloys.

[0044] When machining a balanced cage control valve, only one set of metal surfaces needs to be machined, and a limiting ring groove 12 is opened on the valve core 5. Then, the C-type metal sealing ring 11 is limited and snapped into the limiting ring groove 12. There is no need to consider the fit between the two sets of metal surfaces. Therefore, the machining difficulty is greatly reduced, which can effectively improve the sealing effect of the balanced cage control valve and improve the machining efficiency, thereby reducing the production cost of the balanced cage control valve.

[0045] refer to Figure 1 and Figure 4 A first limiting part 13 is provided inside the valve body 1, and a second limiting part 14 is provided on the inner edge of the upper opening of the valve body 1. A first support part 15 is integrally formed on the outer edge of the bottom of the sleeve 2, and a second support part 16 is integrally formed on the outer edge of the top of the sleeve 2. The first support part 15 abuts against the first limiting part 13, and the second support part 16 abuts against the second limiting part 14. Through the mutual cooperation between the support part and the limiting part, the sleeve 2 can be limited and fixed inside the valve body 1.

[0046] A metal spiral wound gasket 17 is pressed between the first limiting part 13 and the first supporting part 15 to achieve a seal between the first limiting part 13 and the first supporting part 15. A first toothed gasket 18 is pressed between the second limiting part 14 and the second supporting part 16 to achieve a seal between the second limiting part 14 and the second supporting part 16.

[0047] The upper valve cover 3 has an integrally formed pressing part 19, which presses against the second support part 16 of the sleeve 2, thereby applying pressure to the metal spiral wound gasket 17 and the first toothed gasket 18 to further improve the sealing effect of the metal spiral wound gasket 17 and the first toothed gasket 18.

[0048] A second toothed gasket 20 is also pressed between the pressing part 19 and the second support part 16. The second toothed gasket 20 is used to improve the sealing effect of the upper valve cover 3, the valve body 1 and the sleeve 2 at the adjacent points, that is, to improve the sealing effect of the upper opening of the valve body 1.

[0049] The above description of the embodiments is only used to provide a detailed introduction to the technical solution of this utility model. However, the description of the above embodiments is only for the purpose of helping to understand this utility model and should not be construed as a limitation of this utility model. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A balanced cage-type regulating valve, comprising a valve body (1), wherein the valve body (1) has a fluid channel (6), a sleeve (2) is disposed within the valve body (1), a fluid through hole (7) is provided on the sleeve (2), an upper valve cover (3) is disposed on the valve body (1), a valve core rod (4) is slidably disposed on the upper valve cover (3), a valve core (5) is disposed on the valve core rod (4), the valve core (5) is slidably connected within the sleeve (2), a fluid balance cavity (8) is formed between the valve core (5) and the upper valve cover (3), a first sealing pair and a second sealing pair are disposed between the sleeve (2) and the valve core (5), the first sealing pair is located on the side of the fluid through hole (7) away from the upper valve cover (3), and the second sealing pair is located on the side of the fluid through hole (7) close to the upper valve cover (3), characterized in that, The valve core (5) has a limiting annular groove (12) circumferentially formed on the top outer side wall. The second sealing pair includes a C-shaped metal sealing ring (11). The C-shaped metal sealing ring (11) is limited and engaged in the limiting annular groove (12). The opening of the C-shaped metal sealing ring (11) faces the bottom of the limiting annular groove (12). The C-shaped metal sealing ring (11) is sealed and connected to the inner wall of the sleeve (2).

2. The balanced cage regulating valve as described in claim 1, characterized in that, The C-type metal sealing ring (11) is made of stainless steel.

3. The balanced cage regulating valve as described in claim 1, characterized in that, The C-type metal sealing ring (11) is made of nickel-based high-temperature alloy.

4. The balanced cage regulating valve as described in claim 1, characterized in that, The C-type metal sealing ring (11) is made of copper alloy.

5. The balanced cage regulating valve as described in any one of claims 1-4, characterized in that, The first sealing pair includes a first metal surface (9) and a second metal surface (10). The first metal surface (9) is located on the inner edge of the bottom of the sleeve (2), and the second metal surface (10) is located on the outer edge of the bottom of the valve core (5). The first metal surface (9) and the second metal surface (10) are fitted together and sealed.

6. The balanced cage regulating valve as described in claim 5, characterized in that, The valve body (1) has a first limiting part (13) inside, and the sleeve (2) has a first support part (15) at the bottom outer edge, which abuts against the first limiting part (13); the valve body (1) has a second limiting part (14) on it, and the sleeve (2) has a second support part (16) at the top outer edge, which abuts against the second limiting part (14).

7. The balanced cage regulating valve as described in claim 6, characterized in that, A metal spiral wound pad (17) is provided between the first limiting part (13) and the first supporting part (15).

8. The balanced cage regulating valve as described in claim 6, characterized in that, A first toothed gasket (18) is provided between the second limiting part (14) and the second supporting part (16).

9. The balanced cage regulating valve as described in claim 6, characterized in that, The upper valve cover (3) is provided with a pressing part (19), which presses against the second support part (16).

10. The balanced cage regulating valve as described in claim 9, characterized in that, A second toothed gasket (20) is provided between the pressing part (19) and the second support part (16).

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