Flange type balance valve easy and convenient to maintain

Abstract

The flange type balance valve comprises a valve body and a valve element ball, a first flange plate is arranged at the left end of the valve body, a second flange plate is arranged at the right end of the valve body, a first valve rod sleeve is arranged at the top of the valve body, a second valve rod sleeve is correspondingly arranged at the bottom of the valve body, an upper valve rod is rotatably installed in the first valve rod sleeve, and a lower valve rod is fixedly arranged in the second valve rod sleeve in a penetrating mode. The valve element ball is located in the valve body, the upper end of the valve element ball is fixedly connected with the lower end of the upper valve rod, the lower end of the valve element ball is rotationally connected with the upper end of the lower valve rod, a third flange plate is arranged at the upper end of the first valve rod sleeve, the annular valve deck is detachably and coaxially installed in the right end of the valve body, and an elastic sealing assembly in lap joint with the valve element ball is installed in the left end of the annular valve deck. Through the independent modular design of the elastic sealing assembly, the maintenance difficulty of the elastic sealing assembly is remarkably reduced, the maintenance time of each time is shorter than 30 min, compared with a traditional flange type balance valve, the overall replacement and maintenance cost is reduced by 60% or above, the assembling and machining efficiency is high, and economic practicability is good.

Description

Technical Field

[0001] This utility model relates to the field of valve equipment technology, specifically to a flange-type balancing valve that is easy to maintain. Background Technology

[0002] Ball valves are widely used in pipelines in industries such as petroleum refining, metallurgy, chemical engineering, power generation, and urban construction for controlling the flow and shut-off of media. They are among the most widely used valves in various fluid transportation projects. Flanged balancing valves are a type of ball valve, widely used for flow regulation and pressure control of media such as water and oil. Existing flanged balancing valves have the following problems: the flanges at the inlet and outlet are mostly integrally welded to both ends of the valve body, while the sealing assembly used to seal the valve core and the inner contact port of the valve body needs to be embedded inside the valve body at the inner port facing the valve core. This makes it difficult to install or disassemble the sealing assembly inside the valve body, and since the sealing assembly is a consumable part, each maintenance and replacement requires a considerable amount of time, severely affecting the normal operation of the flanged balancing valve; sometimes, to ensure the normal flow of fluid media, the entire flanged balancing valve must be replaced. Therefore, this utility model proposes a flanged balancing valve that is easy to maintain, aiming to solve the above-mentioned technical problems. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a flanged balancing valve that is easy to maintain. By removably and coaxially mounting a ring valve cover inside the second flange on the right end of the valve body, and embedding the elastic sealing component inside the left end of the ring valve cover, an independent modular design of the elastic sealing component is achieved. When replacing or repairing the elastic sealing component, simply remove the ring valve cover from the second flange on the valve body for quick repair. After repair, the ring valve cover can be reinstalled inside the second flange on the right end of the valve body. This significantly reduces the difficulty of repairing the elastic sealing component and improves overall operation. The operation is simple and time-saving, with each maintenance session lasting less than 30 minutes. Compared to the traditional flanged balancing valve, the overall replacement and maintenance cost is reduced by more than 60%, resulting in good economic benefits. Through the independent modular design of the elastic sealing component, the assembly time is shortened by more than 40% compared to the traditional flanged balancing valve, thereby significantly improving the assembly and processing efficiency of this utility model flanged balancing valve. When the elastic sealing component overlaps and seals with the valve core ball, it has a certain elastic deformation, which significantly improves wear conditions compared to the hard sealing component of the traditional flanged balancing valve, extends the maintenance and replacement cycle of the elastic sealing component, and is conducive to the normal operation of the flanged balancing valve.

[0004] To achieve the above objectives, the technical solution of this utility model is to design a flange-type balancing valve that is easy to maintain, including a valve body with a columnar structure and a valve core ball. The valve body has a flange one at the left end and a flange two at the right end. The valve body has a valve stem sleeve one extending upward to the outside through the top and a valve stem sleeve two extending downward to the outside through the bottom. An upper valve stem is rotatably installed inside the valve stem sleeve one, and a lower valve stem is fixedly installed inside the valve stem sleeve two. The valve core ball is located inside the valve body, and the upper end of the valve core ball is fixedly connected to the lower end of the upper valve stem, and the lower end is rotatably connected to the upper end of the lower valve stem. The upper end of the valve stem sleeve one has a flange three. It also includes a detachable annular valve cover coaxially installed inside the right end of the valve body. An elastic sealing component that overlaps with the valve core ball is installed inside the left end of the annular valve cover.

[0005] This utility model discloses a flanged balancing valve that is easy to maintain. It achieves an independent modular design for the elastic sealing component by removably and coaxially mounting a ring valve cover inside the second flange on the right end of the valve body, and embedding the elastic sealing component inside the left end of the ring valve cover. When replacing or repairing the elastic sealing component, simply remove the ring valve cover from the second flange on the valve body for quick repair. After repair, the ring valve cover can be re-fixed inside the second flange on the right end of the valve body. This significantly reduces the difficulty of repairing the elastic sealing component, and the overall operation is simple, time-saving, and efficient. Maintenance time is less than 30 minutes, reducing the overall replacement and maintenance cost of traditional flanged balancing valves by more than 60%, resulting in good economic benefits. Through the independent modular design of the elastic sealing component, the assembly time is shortened by more than 40% compared to traditional flanged balancing valves, thus significantly improving the assembly and processing efficiency of this utility model's flanged balancing valve. The elastic sealing component has a certain elastic deformation when it overlaps and seals with the valve core ball, significantly improving wear conditions compared to the hard sealing component of traditional flanged balancing valves, extending the maintenance and replacement cycle of the elastic sealing component, and facilitating the normal operation of the flanged balancing valve.

[0006] The preferred technical solution is that the right end of the annular valve cover has an annular eave extending outward, and the right end of the flange has an annular countersunk groove. The outer circumferential side of the annular eave and the inner circumferential side of the annular countersunk groove have mutually compatible threaded structures. The annular eave is screwed into the annular countersunk groove, and the right end face of the annular valve cover is flush with the right end face of the flange. The valve core ball has a hemispherical shell structure, and a W-shaped through hole is opened on one side of the valve core ball. The annular valve cover is screwed into the flange by the annular eave, simplifying installation and disassembly and further improving the efficiency of replacing and maintaining the elastic sealing assembly.

[0007] A further preferred technical solution includes an annular countersunk groove four located inside the left end of the annular valve cover. An annular valve seat, a support ring, an elastic washer, and a flat washer are sequentially embedded from left to right inside the annular countersunk groove four. The support ring includes an axial section that is interference-fitted into the right end of the annular valve seat. The right end of the axial section has a radial section extending outwards, which abuts against the right side of the annular valve seat. The elastic washer is sandwiched between the radial section and the flat washer on the support ring. The annular valve seat, support ring, elastic washer, and flat washer constitute the elastic sealing assembly. The elastic sealing assembly has a clever and reasonable structural design, good elastic buffering performance, and a simple embedding method inside the left end of the annular valve cover, ensuring the smooth fabrication and implementation of the flange-type balancing valve of this utility model.

[0008] A further preferred technical solution includes O-rings provided between the left side of the annular eaves body two and the annular bottom surface of the annular countersunk groove one, and between the outer circumferential side of the annular valve seat and the inner circumferential side of the annular countersunk groove four. The O-rings effectively seal and connect the left side of the annular eaves body two and the annular bottom surface of the annular countersunk groove one, as well as between the outer circumferential side of the annular valve seat and the inner circumferential side of the annular countersunk groove four, ensuring good overall sealing and leak-proof performance of the flange-type balancing valve of this utility model during use.

[0009] A further preferred technical solution involves the upper valve stem being rotatably mounted inside the valve stem sleeve via a bearing assembly. The valve core ball has corresponding slots at its top and bottom. The lower end of the upper valve stem is inserted and fixed into the slot at the top of the valve core ball via a keyway assembly. A bearing is embedded and fixed inside the slot at the bottom of the valve core ball. The upper end of the lower valve stem is interference-fitted into the inner ring of the bearing. The connection method between the upper and lower valve stems and the valve core ball is simple and highly feasible for application.

[0010] A further preferred technical solution includes an annular cap, wherein the upper end of the annular cap has an annular rim extending outwards, and the upper end of the valve stem sleeve has an annular countersunk groove located inside. The outer circumferential side of the annular rim and the inner circumferential side of the annular countersunk groove are provided with mutually compatible threaded structures. The annular cap is screwed into the annular countersunk groove via the annular rim, and an O-ring is embedded at the bottom of the annular countersunk groove to abut against the lower end face of the annular cap. The sealing installation method of the annular cap on the upper end of the valve stem sleeve is simple, ensuring convenient and efficient replacement of the O-ring inside the valve stem sleeve.

[0011] A further preferred technical solution includes an annular rim extending outwards from the lower end of the lower valve stem, and an annular countersunk groove located inside the lower end of the valve stem sleeve. The outer circumferential side of the annular rim and the inner circumferential side of the annular countersunk groove are provided with mutually compatible threaded structures. The annular rim at the lower end of the lower valve stem is screwed into the annular countersunk groove, and an O-ring is embedded at the top of the annular countersunk groove, abutting against the upper surface of the annular rim. The fixing method between the lower valve stem and the lower end of the valve stem sleeve is simple, ensuring efficient assembly and processing of the flange-type balance valve of this invention.

[0012] A further preferred technical solution is that at least one pair of blind holes are provided on the lower end face of the lower valve stem, the right end face of the annular valve cover, and the upper end face of the annular gland. This facilitates the disassembly or reassembly of the lower valve stem, annular valve cover, or annular gland onto the valve body using tools such as pipe wrenches, further ensuring the high efficiency of maintenance of the flange-type balancing valve of this utility model.

[0013] A further preferred technical solution includes the following: the valve body, valve stem sleeve one, valve stem sleeve two, support ring, annular valve cover, flat washer, annular gland, flange one, flange two, sleeve, and flange three are all made of 20# carbon steel; the valve core ball is made of 304 stainless steel; the upper and lower valve stems are both made of 20CR13 stainless steel; the annular valve seat is made of polytetrafluoroethylene / 25% carbon fiber composite material; the elastic washer is a disc spring made of 50CRvA spring steel; and the O-ring is made of VITON fluororubber. The materials used in each component are universally applicable and readily available in the market. Furthermore, the performance of the materials used in each component meets the environmental requirements of use, enabling the flanged balancing valve of this utility model to achieve systematic optimization of sealing performance, structural strength, and processing precision. It meets the requirements for long-term reliable operation under harsh working conditions, and is especially suitable for conditions with frequent temperature changes and high pressure differentials, such as thermal pipelines and hydraulic systems. It can directly replace existing balancing valves of the same specification without modifying the pipeline structure. The annular valve seat made of polytetrafluoroethylene / 25% carbon fiber composite material, in conjunction with the disc spring, enables the flanged balancing valve of this invention to have a leakage rate of ≤0.01% under a nominal pressure of 1.6MPa, which is more than 80% lower than that of traditional flanged balancing valves using hard seal components; the material deformation rate is <0.5%, which meets the requirements for stable sealing in a temperature range of -29℃ to 150℃; key components such as the valve body are made of 20# carbon steel, which improves the structural strength by more than 20%, extends the fatigue life by more than 15%, and reduces the maintenance cost by more than 60% compared with traditional flanged balancing valves.

[0014] A further preferred technical solution is that the valve body is provided with a sleeve extending into the interior, and the inner circumferential wall of the sleeve's open end on the outer side has an internal thread structure. A temperature sensor can be installed inside the sleeve to detect the temperature of the medium flowing through the flange-type balancing valve.

[0015] The advantages and beneficial effects of this utility model are as follows:

[0016] 1. This utility model discloses a flanged balancing valve that is easy to maintain. By removably and coaxially mounting a ring valve cover inside the second flange on the right end of the valve body, and embedding the elastic sealing component inside the left end of the ring valve cover, an independent modular design of the elastic sealing component is achieved. When replacing or repairing the elastic sealing component, simply remove the ring valve cover from the second flange on the valve body for quick repair. After repair, the ring valve cover can be re-fixed inside the second flange on the right end of the valve body. This significantly reduces the difficulty of repairing the elastic sealing component, and the overall operation is simple and time-saving. Each maintenance session lasts less than 30 minutes, reducing the overall replacement and maintenance cost of traditional flanged balancing valves by more than 60%, resulting in good economic benefits. Through the independent modular design of the elastic sealing component, the assembly time is shortened by more than 40% compared to traditional flanged balancing valves, thus significantly improving the assembly and processing efficiency of this utility model's flanged balancing valve. The elastic sealing component exhibits a certain elastic deformation when overlapping and sealing with the valve core ball, significantly improving wear conditions compared to the hard sealing component of traditional flanged balancing valves, extending the maintenance and replacement cycle of the elastic sealing component, and facilitating the normal operation of the flanged balancing valve.

[0017] 2. The annular valve cover is fixed to the inside of the flange by the annular eaves two screws, which makes the installation or disassembly simple and helps to further improve the efficiency of replacement and maintenance of the elastic sealing components.

[0018] 3. The elastic sealing component has a clever and reasonable structural design, good elastic buffering performance, and a simple embedding method inside the left end of the annular valve cover, ensuring that the flange-type balance valve of this utility model can be successfully manufactured and implemented.

[0019] 4. The valve body, valve stem sleeve one, valve stem sleeve two, support ring, annular valve cover, flat washer, annular gland, flange one, flange two, sleeve, and flange three are all made of 20# carbon steel. The valve core ball is made of 304 stainless steel. The upper and lower valve stems are both made of 20CR13 stainless steel. The annular valve seat is made of polytetrafluoroethylene / 25% carbon fiber composite material. The elastic washer is a disc spring made of 50CRvA spring steel. The O-ring is made of VITON fluororubber. The materials used in each component are versatile and readily available in the market. Furthermore, the performance of the materials used in each component meets the environmental requirements of the application environment. This allows the flange-type balancing valve of this utility model to achieve systematic optimization of sealing performance, structural strength, and processing precision, meeting the requirements for long-term reliable operation under harsh working conditions. It is especially suitable for conditions with frequent temperature changes and high pressure differentials, such as thermal pipelines and hydraulic systems. It can directly replace existing balancing valves of the same specification without modifying the pipeline structure. The annular valve seat made of polytetrafluoroethylene / 25% carbon fiber composite material, in conjunction with the disc spring, enables the flanged balancing valve of this invention to have a leakage rate of ≤0.01% under a nominal pressure of 1.6MPa, which is more than 80% lower than that of traditional flanged balancing valves using hard seal components; the material deformation rate is <0.5%, which meets the requirements for stable sealing in a temperature range of -29℃ to 150℃; key components such as the valve body are made of 20# carbon steel, which improves the structural strength by more than 20%, extends the fatigue life by more than 15%, and reduces the maintenance cost by more than 60% compared with traditional flanged balancing valves. Attached Figure Description

[0020] Figure 1 This is a longitudinal sectional view along the axial centerline of the valve body of a flange-type balancing valve that is easy to maintain according to this utility model.

[0021] Figure 2 yes Figure 1 A magnified view of a section at point S in the middle;

[0022] Figure 3 yes Figure 1 A magnified view of the middle T section;

[0023] Figure 4 yes Figure 1 A magnified view of the area at point W in the middle.

[0024] In the diagram: 1. Valve body; 2. Valve core ball; 3. Valve stem sleeve one; 4. Upper valve stem; 5. Valve stem sleeve two; 6. Lower valve stem; 7. Annular valve cover; 8. Annular valve seat; 9. Support ring; 10. Elastic washer; 11. Flat washer; 12. Annular gland; 1-1. Flange one; 1-2. Flange two; 1-2a. Annular countersunk groove one; 1-3. Sleeve; 2-1. Slot; 2-2. Bearing; 2-3. W-shaped through hole; 3-1. Flange three; 3-2. Annular countersunk groove two; 5-1. Annular countersunk groove three; 6-1. Annular eaves one; 7-1. Annular countersunk groove four; 7-2. Annular eaves two; 9-1. Axial section; 9-2. Radial section; 12-1. Annular eaves three; A. O-ring; B. Blind hole. Detailed Implementation

[0025] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0026] Example

[0027] like Figures 1-4 As shown, this utility model is a flange-type balancing valve that is easy to maintain, including a columnar valve body 1 and a valve core ball 2. The valve body 1 has a flange 1-1 on the left end and a flange 1-2 on the right end. A valve stem sleeve 3 extending upward to the outside is provided through the top of the valve body 1, and a valve stem sleeve 5 extending downward to the outside is provided through the bottom of the valve body 1. An upper valve stem 4 is rotatably installed inside the valve stem sleeve 3, and a lower valve stem 6 is fixedly installed inside the valve stem sleeve 5. The valve core ball 2 is located inside the valve body 1, and the upper end of the valve core ball 2 is fixedly connected to the lower end of the upper valve stem 4, and the lower end is rotatably connected to the upper end of the lower valve stem 6. A flange 3-1 is provided at the upper end of the valve stem sleeve 3. It also includes a detachable annular valve cover 7 coaxially installed inside the right end of the valve body 1. An elastic sealing assembly that overlaps with the valve core ball 2 is installed inside the left end of the annular valve cover 7.

[0028] Preferably, the right end of the annular valve cover 7 is provided with an annular eave body 2 7-2 extending outward, and the right end of the flange 2 1-2 is provided with an annular countersunk groove 1-2a located inside. The outer peripheral side of the annular eave body 2 7-2 and the inner peripheral side of the annular countersunk groove 1-2a are provided with mutually compatible threaded structures. The annular eave body 2 7-2 is screwed into the annular countersunk groove 1-2a, and the right end face of the annular valve cover 7 is flush with the right end face of the flange 2 1-2. The valve core ball 2 is a hemispherical shell structure, and a W-shaped through hole 2-3 is opened on one side of the valve core ball 2.

[0029] More preferably, the left end of the annular valve cover 7 is provided with an annular countersunk groove 7-1 located inside. The annular countersunk groove 7-1 is fitted with an annular valve seat 8, a support ring 9, an elastic washer 10 and a flat washer 11 from left to right. The support ring 9 includes an axial section 9-1 that is interference-fitted and installed inside the right end of the annular valve seat 8. The right end of the axial section 9-1 has a radial section 9-2 extending outward. The radial section 9-2 abuts against the right side of the annular valve seat 8. The elastic washer 10 is clamped between the radial section 9-2 and the flat washer 11 on the support ring 9. The annular valve seat 8, the support ring 9, the elastic washer 10 and the flat washer 11 constitute the elastic sealing assembly.

[0030] More preferably, an O-ring A is provided between the left side of the annular eave body 2 7-2 and the annular bottom surface of the annular countersunk groove 1-2a, and between the outer peripheral side of the annular valve seat 8 and the inner peripheral side of the annular countersunk groove 4 7-1.

[0031] More preferably, the upper valve stem 4 is rotatably mounted inside the valve stem sleeve 3 via a bearing assembly. The valve core ball 2 has corresponding slots 2-1 at its top and bottom. The lower end of the upper valve stem 4 is inserted and fixed inside the slot 2-1 at the top of the valve core ball 2 via a keyway assembly. A bearing 2-2 is embedded and fixed inside the slot 2-1 at the bottom of the valve core ball 2. The upper end of the lower valve stem 6 is interference-fitted into the inner ring of the bearing 2-2. The keyway assembly is a conventional technique in this field and will not be described in detail here.

[0032] More preferably, it also includes an annular cap 12, the annular cap 12 having an annular eaves 12-1 extending outward at its upper end, the valve stem sleeve 3 having an annular countersunk groove 3-2 located inside at its upper end, the outer peripheral side of the annular eaves 12-1 and the inner peripheral side of the annular countersunk groove 3-2 having mutually compatible threaded structures, the annular cap 12 being screwed into the annular countersunk groove 3-2 via the annular eaves 12-1, and an O-ring A being embedded at the bottom of the annular countersunk groove 3-2 that abuts against the lower end face of the annular cap 12.

[0033] More preferably, the lower valve stem 6 has an annular rim 6-1 extending outward at its lower end, and an annular countersunk groove 5-1 located inside the lower end of the valve stem sleeve 5. The outer circumferential side of the annular rim 6-1 and the inner circumferential side of the annular countersunk groove 5-1 are provided with mutually compatible threaded structures. The annular rim 6-1 at the lower end of the lower valve stem 6 is screwed into the annular countersunk groove 5-1. An O-ring A is embedded in the top of the annular countersunk groove 5-1, which abuts against the upper end face of the annular rim 6-1.

[0034] More preferably, at least one pair of blind holes B are provided on the lower end face of the lower valve stem 6, the right end face of the annular valve cover 7, and the upper end face of the annular pressure cap 12.

[0035] More preferably, the valve body 1, valve stem sleeve 1, valve stem sleeve 2, support ring 9, annular valve cover 7, flat washer 11, annular gland 12, flange 1-1, flange 2-2, sleeve 1-3 and flange 3-1 are all made of 20# carbon steel, the valve core ball 2 is made of 304 stainless steel, the upper valve stem 4 and lower valve stem 6 are both made of 20CR13 stainless steel, the annular valve seat 8 is made of polytetrafluoroethylene / 25% carbon fiber composite material, the elastic washer 10 is a disc spring made of 50CRvA spring steel, and the O-ring A is made of VITON fluororubber. Key components such as the valve body are made of 20# carbon steel, which has high strength and excellent weldability, suitable for media such as water and oil. The valve core ball is made of 304 stainless steel, which has strong corrosion resistance and avoids surface wear caused by media erosion. The annular valve seat is made of polytetrafluoroethylene / 25% carbon fiber composite material, which combines the low friction characteristics of PTFE with the high strength of carbon fiber, with a wide temperature range (-29℃~150℃) and a 30% increase in compressive deformation resistance. The elastic gasket is made of 50CRvA spring steel, which has lasting elasticity and ensures that the annular valve seat and the valve core ball remain in a tight fit, adapting to pressure fluctuation conditions. The upper and lower valve stems are both made of 20CR13 stainless steel, which has high surface hardness (HRC28-32) and better bending resistance and wear resistance than conventional materials. Combined with the 20# carbon steel valve stem sleeve, it reduces sliding friction loss and extends the overall service life of this flange-type balancing valve. The O-ring is made of VITON fluororubber, which has excellent oil resistance and meets the requirements for long-term use in oil media conditions.

[0036] More preferably, the valve body 1 is provided with a sleeve 1-3 extending into the interior, and the inner circumferential wall surface of the outer opening end of the sleeve 1-3 is provided with an internal thread structure.

[0037] The present invention relates to a simple maintenance principle for a flange-type balancing valve:

[0038] When overhauling the resilient sealing assembly, simply insert the two pliers of a pipe wrench or similar tool into the pair of blind holes B on the annular valve cover 7, and then turn the pipe wrench counterclockwise to remove the annular valve cover 7 from the valve body 1. After replacing the corresponding parts on the resilient sealing assembly, reinstall the annular valve cover 7 on the right end of the valve body 1, and re-screw the annular eaves 7-2 into the annular countersunk groove 1-2a on the flange 1-2. Alternatively, the annular gland 12 or the lower valve stem 6 can be removed using a pipe wrench or similar tool to replace the corresponding O-ring A.

[0039] This utility model discloses a flanged balancing valve that is easy to maintain. It achieves an independent modular design for the elastic sealing component by removably and coaxially mounting a ring valve cover inside the second flange on the right end of the valve body, and embedding the elastic sealing component inside the left end of the ring valve cover. When replacing or repairing the elastic sealing component, simply remove the ring valve cover from the second flange on the valve body for quick repair. After repair, the ring valve cover can be re-fixed inside the second flange on the right end of the valve body. This significantly reduces the difficulty of repairing the elastic sealing component, and the overall operation is simple, time-saving, and efficient. Maintenance time is less than 30 minutes, reducing the overall replacement and maintenance cost of traditional flanged balancing valves by more than 60%, resulting in good economic benefits. Through the independent modular design of the elastic sealing component, the assembly time is shortened by more than 40% compared to traditional flanged balancing valves, thus significantly improving the assembly and processing efficiency of this utility model's flanged balancing valve. The elastic sealing component has a certain elastic deformation when it overlaps and seals with the valve core ball, significantly improving wear conditions compared to the hard sealing component of traditional flanged balancing valves, extending the maintenance and replacement cycle of the elastic sealing component, and facilitating the normal operation of the flanged balancing valve.

[0040] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A flanged balancing valve with easy maintenance, comprising a columnar valve body (1) and a valve core ball (2), wherein the valve body (1) has a flange 1 (1-1) at the left end and a flange 2 (1-2) at the right end, a valve stem sleeve 1 (3) extending upward to the outside is provided through the top of the valve body (1), and a valve stem sleeve 2 (5) extending downward to the outside is provided through the bottom of the valve body (1), an upper valve stem (4) is rotatably installed inside the valve stem sleeve 1 (3), and a lower valve stem (6) is fixedly connected inside the valve stem sleeve 2 (5), the valve core ball (2) is located inside the valve body (1), and the upper end of the valve core ball (2) is fixedly connected to the lower end of the upper valve stem (4), and the lower end is rotatably connected to the upper end of the lower valve stem (6), and a flange 3 (3-1) is provided at the upper end of the valve stem sleeve 1 (3), characterized in that, It also includes a detachable annular valve cover (7) coaxially mounted inside the right end of the valve body (1), and an elastic sealing assembly that overlaps with the valve core ball (2) is installed inside the left end of the annular valve cover (7).

2. The easy-to-maintain flange-type balancing valve as described in claim 1, characterized in that, The annular valve cover (7) has an annular eave body two (7-2) extending outward at the right end, and the flange two (1-2) has an annular countersunk groove one (1-2a) located inside at the right end. The outer peripheral side of the annular eave body two (7-2) and the inner peripheral side of the annular countersunk groove one (1-2a) are provided with mutually compatible threaded structures. The annular eave body two (7-2) is screwed into the annular countersunk groove one (1-2a), and the right end face of the annular valve cover (7) is flush with the right end face of the flange two (1-2). The valve core ball (2) has a hemispherical shell structure, and a W-shaped through hole (2-3) is provided on one side end of the valve core ball (2).

3. The easy-to-maintain flange-type balancing valve as described in claim 2, characterized in that, The left end of the annular valve cover (7) is provided with an annular countersunk groove four (7-1) located inside. The annular countersunk groove four (7-1) is fitted with an annular valve seat (8), a support ring (9), an elastic washer (10) and a flat washer (11) from left to right. The support ring (9) includes an axial section (9-1) that is interference-fitted and installed inside the right end of the annular valve seat (8). The right end of the axial section (9-1) has a radial section (9-2) extending outward. The radial section (9-2) abuts against the right side of the annular valve seat (8). The elastic washer (10) is sandwiched between the radial section (9-2) and the flat washer (11) on the support ring (9). The annular valve seat (8), the support ring (9), the elastic washer (10) and the flat washer (11) constitute the elastic sealing assembly.

4. The easy-to-maintain flange-type balancing valve as described in claim 3, characterized in that, O-rings (A) are provided between the left side of the annular eaves (7-2) and the annular bottom surface of the annular countersunk groove (1-2a), and between the outer peripheral side of the annular valve seat (8) and the inner peripheral side of the annular countersunk groove (7-1).

5. The easy-to-maintain flange-type balancing valve as described in claim 4, characterized in that, The upper valve stem (4) is rotatably mounted inside the valve stem sleeve (3) via a bearing assembly. The valve core ball (2) has corresponding slots (2-1) at its top and bottom. The lower end of the upper valve stem (4) is inserted and fixed inside the slot (2-1) at the top of the valve core ball (2) via a keyway assembly. A bearing (2-2) is embedded and fixed inside the slot (2-1) at the bottom of the valve core ball (2). The upper end of the lower valve stem (6) is interference-fitted into the inner ring of the bearing (2-2).

6. The easy-to-maintain flange-type balancing valve as described in claim 5, characterized in that, It also includes an annular cap (12), the upper end of which is provided with an annular eave body three (12-1) extending outward, the upper end of the valve stem sleeve one (3) is provided with an annular countersunk groove two (3-2) located inside, the outer peripheral side of the annular eave body three (12-1) and the inner peripheral side of the annular countersunk groove two (3-2) are provided with mutually compatible threaded structures, the annular cap (12) is screwed into the annular countersunk groove two (3-2) through the annular eave body three (12-1), and the bottom of the annular countersunk groove two (3-2) is fitted with an O-ring (A) that abuts against the lower end face of the annular cap (12).

7. The easy-to-maintain flange-type balancing valve as described in claim 6, characterized in that, The lower valve stem (6) has an annular rim (6-1) extending outward at its lower end, and an annular countersunk groove (5-1) located inside the lower end of the valve stem sleeve (5). The outer circumferential side of the annular rim (6-1) and the inner circumferential side of the annular countersunk groove (5-1) are provided with mutually compatible threaded structures. The annular rim (6-1) at the lower end of the lower valve stem (6) is screwed into the annular countersunk groove (5-1). An O-ring (A) that abuts against the upper end face of the annular rim (6-1) is embedded in the top of the annular countersunk groove (5-1).

8. The easy-to-maintain flange-type balancing valve as described in claim 7, characterized in that, The lower end face of the lower valve stem (6), the right end face of the annular valve cover (7), and the upper end face of the annular pressure cap (12) are each provided with at least one pair of blind holes (B).

9. The easy-to-maintain flange-type balancing valve as described in claim 8, characterized in that, The valve body (1), valve stem sleeve one (3), valve stem sleeve two (5), support ring (9), annular valve cover (7), flat washer (11), annular gland (12), flange one (1-1), flange two (1-2), sleeve (1-3) and flange three (3-1) are all made of 20# carbon steel. The valve core ball (2) is made of 304 stainless steel. The upper valve stem (4) and lower valve stem (6) are both made of 20CR13 stainless steel. The annular valve seat (8) is made of polytetrafluoroethylene / 25% carbon fiber composite material. The elastic washer (10) is a disc spring made of 50CRvA spring steel. The O-ring (A) is made of VITON fluororubber.

10. The easy-to-maintain flange-type balancing valve as described in any one of claims 1 to 9, characterized in that, The valve body (1) is provided with a sleeve (1-3) extending into the interior, and the inner circumferential wall surface of the sleeve (1-3) located on the outer side of the opening end is provided with an internal thread structure.

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