A compensating assembly for a corrosion resistant butterfly valve

Abstract

The utility model relates to butterfly valve technical field discloses a kind of compensation assembly of anticorrosive butterfly valve, including valve body, the both sides of valve body are fixedly connected with flange plate, and the surrounding of flange plate is equipped with multiple mounting holes, the inside vertical through of valve body is provided with valve stem, the outside of valve stem is fixedly connected with valve plate, the inside of valve body is rotatably connected with the valve plate, the top of valve stem is provided with connecting assembly, the bottom of valve stem is provided with protection assembly, the inside of valve body is provided with compensation assembly.In the utility model, by setting disc spring compensation assembly, the sealing force drop caused by cold flow, temperature difference and abrasion can be dynamically compensated, ensuring long-term sealing reliability. At the same time, its unique safety pin can directly lock valve stem, realizing reliable physical fixation, and having anti-loss design, significantly improving the safety of equipment maintenance and transportation process.

Description

Technical Field

[0001] This utility model relates to the field of butterfly valve technology, and in particular to a compensation component for a corrosion-resistant butterfly valve. Background Technology

[0002] Currently, butterfly valves, as fluid control components with simple structure and rapid opening and closing, are widely used in many industrial fields such as chemical, water treatment, food, and pharmaceutical industries. Especially in pipeline systems handling highly corrosive media, corrosion-resistant butterfly valves play an indispensable role. These butterfly valves typically have their inner walls and valve plate surfaces in contact with the media lined or coated with high-molecular materials such as polytetrafluoroethylene (PTFE), utilizing their excellent chemical inertness to protect the equipment. Therefore, ensuring the sealing performance and operational safety of these corrosion-resistant butterfly valves under complex operating conditions is a continuously important technical focus within the industry.

[0003] Regarding the aforementioned issues, a typical existing anti-corrosion butterfly valve primarily achieves its seal through an interference fit. Specifically, an integral PTFE (polytetrafluoroethylene) valve seat with initial elasticity is pressed into a seat mounting groove inside the valve body by external force, causing it to pre-deform. When the valve plate rotates to close, the outer edge of the valve plate presses against the inner wall of the valve seat, relying on the elastic restoring force generated by the compressed valve seat material to form a sealing surface, thereby blocking the flow of media. For operational safety, some butterfly valves have a simple limit hole or locking plate on the top drive unit connection flange or the handle of the manual actuator. When the valve is in the fully open or fully closed position, the user can use an external lock such as a padlock to lock it, preventing unauthorized operation.

[0004] However, long-term research and application have revealed some inherent limitations in the aforementioned technologies. First, the reliability of this sealing method, which relies solely on the elasticity of the valve seat material, decreases over time. Polytetrafluoroethylene (PTFE) undergoes cold flow (creep) under continuous pressure, gradually losing its elastic recovery ability, reducing the sealing pressure, and ultimately leading to internal leakage of the medium. Second, temperature fluctuations in the operating environment also pose a significant challenge. When the medium temperature changes, the large difference in thermal expansion coefficients between the metal valve body / plate and the polymer valve seat causes relative displacement, which can easily create momentary or permanent leakage gaps at the sealing surface.

[0005] Furthermore, in applications requiring frequent switching, the repeated friction between the valve plate and seat inevitably leads to wear on the sealing surface. This physical damage directly compromises the integrity of the seal, significantly shortening the valve's service life. Moreover, the safety locking function of existing butterfly valves is also inadequate. Most locking devices only act on the external actuator, failing to directly and rigidly lock the valve stem and valve plate—the core moving components. This leaves a safety hazard of malfunction due to transmission clearance during equipment maintenance. Simultaneously, during valve transportation and installation, the valve plate is in a free state within the valve cavity, making it highly susceptible to impacts and collisions that could damage the fragile valve seat sealing surface, causing permanent damage. Furthermore, if a separate locking pin is provided, it is often a separate accessory, easily lost in complex industrial environments, rendering the safety function ineffective.

[0006] To address the above problems, a compensation component for a corrosion-resistant butterfly valve is proposed. Utility Model Content

[0007] To overcome the above deficiencies, this utility model provides a compensation component for an anti-corrosion butterfly valve, which aims to solve the problem that the sealing performance of existing anti-corrosion butterfly valves deteriorates over time due to creep, thermal expansion and contraction, and wear of valve seat materials, and that there is a lack of a direct and effective locking structure for the valve plate, thus posing a safety hazard.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: a compensation component for an anti-corrosion butterfly valve, comprising a valve body, flanges fixedly connected to both sides of the valve body, and multiple mounting holes circumferentially formed around the flanges; a valve stem vertically penetrating the interior of the valve body; a valve plate fixedly connected to the outer side of the valve stem; the valve plate rotatably connected to the interior of the valve body; a connecting component at the top of the valve stem; a protective component at the bottom of the valve stem; and a compensation component inside the valve body.

[0009] As a further description of the above technical solution: The connecting assembly includes a top valve seat, which is fixedly connected to the top of the valve body. A square shaft is provided at the top of the valve stem, which is used to connect to an external driving mechanism.

[0010] As a further description of the above technical solution: A bottom valve seat is fixedly connected to the bottom of the valve body, and reinforcing plates are fixedly connected to both sides of the bottom valve seat and the two flanges.

[0011] As a further description of the above technical solution: The protective assembly includes a protective cover, a dust cover is installed at the end of the protective cover away from the valve body, four hexagonal bolts are arranged around the inside of the dust cover, the dust cover and the protective cover are fixed together by the four hexagonal bolts, a plurality of hexagonal bolts are arranged around the bottom of the bottom valve seat, and a snap-fit ​​assembly is provided on the inner and outer sides of the bottom valve seat.

[0012] As a further description of the above technical solution: The end of the valve stem is rotatably connected inside the protective cover.

[0013] As a further description of the above technical solution: The snap-fit ​​assembly includes a safety pin with a chain mounted on its top, the end of the chain away from the safety pin being snapped onto the outside of the hexagonal bolt 2.

[0014] As a further description of the above technical solution: Two guide bushings are provided at the end of the valve stem, and the safety pin is inserted into the inside of the guide bushings.

[0015] As a further description of the above technical solution: The valve body has an inner groove circumferentially formed inside. The compensation component includes multiple disc springs, which are arranged circumferentially inside the inner groove and abut against the outer side of the valve plate.

[0016] This utility model has the following beneficial effects: 1. In this utility model, by opening an annular inner groove inside the valve body and setting a compensation component composed of multiple disc springs in the inner groove, the sealing failure problem caused by the physical defects of the valve seat material in traditional anti-corrosion butterfly valves is solved, the leakage risk caused by material deformation or wear is overcome, the sealing reliability and service life of butterfly valves in wide temperature range and complex working conditions are greatly improved, and maintenance costs are reduced.

[0017] 2. In this invention, a guide bushing is provided at the end of the valve stem. When the valve is in the fully closed position, a safety pin can be inserted into it to physically lock the valve stem, thereby rigidly fixing the position of the valve plate. This function not only effectively prevents misoperation during equipment maintenance or pipeline upkeep, ensuring the safety of personnel and equipment, but also protects the valve seat sealing surface from impact and vibration damage during valve transportation or long-term storage. Furthermore, by connecting the safety pin to two hexagonal bolts on the valve body via a chain, the problem of accidental loss of the pin in the field environment is effectively avoided. Attached Figure Description

[0018] Figure 1 This is a three-dimensional schematic diagram of a compensation component for an anti-corrosion butterfly valve proposed in this utility model. Figure 2 This is a schematic diagram of the dust cover of the compensation component of an anti-corrosion butterfly valve proposed in this utility model. Figure 3 This is a schematic diagram of the structure of the safety pin of the compensation component of the corrosion-resistant butterfly valve proposed in this utility model; Figure 4 This is a schematic diagram of the disc spring structure of the compensation component of the corrosion-resistant butterfly valve proposed in this utility model.

[0019] Legend: 1. Valve body; 2. Flange; 3. Mounting hole; 4. Top valve seat; 5. Square shaft; 6. Valve plate; 7. Reinforcing plate; 8. Bottom valve seat; 9. Protective cover; 10. Valve stem; 11. Dust cover; 12. Hex bolt one; 13. Safety pin; 14. Chain; 15. Hex bolt two; 16. Guide bushing; 17. Inner groove; 18. Disc spring. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Reference Figure 1 - Figure 4 This utility model provides an embodiment of a compensation component for an anti-corrosion butterfly valve, comprising a valve body 1. Flanges 2 for connecting to pipelines are integrally cast or welded to both sides of the valve body 1. Multiple mounting holes 3 are evenly distributed around the flanges 2 for threading bolts to fix the valve on the pipeline. A valve stem 10 is installed inside the valve body 1 along its vertical centerline. The valve stem 10 is rotatably connected to the valve body 1 via upper and lower bearings to reduce operating torque. A valve plate 6 is fixedly installed in the middle of the valve stem 10 via a key or pin connection. The valve plate 6 is made of stainless steel with a polytetrafluoroethylene (PTFE) lining, allowing it to rotate synchronously with the valve stem 10, thereby opening and closing the valve. A top valve seat 4 is fixedly connected to the top of the valve body 1. The top valve seat 4 is used to install the valve stem 10 sealing packing and to provide an installation platform for the external drive mechanism. The top of the valve stem 10 extends out of the top valve seat 4 and is machined into a square shaft 5. The square shaft 5 can be connected to a manual handle or an electric or pneumatic actuator to transmit switching torque. Inside the valve body 1, a set of compensation components is centrally located to achieve self-adaptive sealing of the valve.

[0022] To achieve highly reliable dynamic sealing of the valve under harsh operating conditions, a ring-shaped inner groove 17 is precision-machined inside the valve body 1, surrounding the fluid passage. The geometric dimensions of this inner groove 17 are precisely calculated based on the valve diameter and pressure rating. The compensation assembly consists of multiple independent disc springs 18, preferably made of Hastelloy or Inconel alloys with excellent corrosion resistance. During assembly, the disc springs 18 are first paired in series to form a basic elastic unit. Then, these elastic units are placed side-by-side into the inner groove 17 until the entire annular groove is filled, forming a complete ring spring assembly. Subsequently, an integral PTFE valve seat is installed on the disc spring 18 assembly. During installation, the valve seat pre-compresses the disc spring 18 assembly to store elastic energy. When the valve is in operation, the pre-compressed disc springs 18 apply a continuous and uniform axial thrust to the back of the valve seat, which is converted into radial pressure on the outer sealing surface of the valve plate 6 by the structure of the valve seat.

[0023] To further enhance the overall safety and protection of the valve, a bottom valve seat 8 is fixedly connected to the bottom of the valve body 1. To strengthen the overall mechanical strength of the valve, especially in large-diameter valves, reinforcing plates 7 are welded between the bottom valve seat 8 and the two flanges 2 on both sides. The bottom of the valve stem 10 passes through the bottom valve seat 8 and extends into a protective cover 9 for rotatable connection. The protective cover 9 is fixed to the bottom of the bottom valve seat 8 by multiple hexagonal bolts 15, and a removable dust cover 11 is installed at its end. The dust cover 11 is fixed to the protective cover 9 by four hexagonal bolts 12, effectively preventing external dust, moisture, or corrosive gases from entering the bearing area at the bottom of the valve stem 10. To achieve physical locking of the valve in the closed state, two guide bushings 16 are radially opened at the end of the valve stem 10 away from the valve plate 6. At the same time, through holes corresponding to the guide bushings 16 are opened on the fixed protective cover 9 housing. When locking is required, the operator first rotates the valve to the fully closed position, at which point the guide bushing 16 on the valve stem 10 is precisely aligned with the through hole on the protective cover 9. Then, the operator inserts a specially designed safety pin 13 through the through hole of the protective cover 9 and fully into the guide bushing 16. At this point, the valve stem 10 cannot rotate because it is mechanically connected to the fixed protective cover 9 by the safety pin 13, thus achieving rigid locking of the valve plate 6. To prevent the safety pin 13 from being lost, its top is also secured to a hexagonal bolt 15 on the outside of the protective cover 9 by a chain 14, a very user-friendly design. This locking function provides double safety assurance during equipment maintenance, transportation, and processes requiring long-term shutdown.

[0024] Working principle: When the external drive mechanism is connected to the square shaft 5 at the top of the valve stem 10 and a torque is applied, the torque is transmitted to the valve stem 10 through the top valve seat 4, driving the valve stem 10 and the valve plate 6 fixed thereon to rotate inside the valve body 1 to control the opening and closing of the fluid passage; during the valve closing process, the outer edge of the valve plate 6 will rotate and squeeze the valve seat installed inside the valve body 1. At this time, the multiple disc springs 18 located behind the valve seat and set in the annular inner groove 17 will be compressed and generate a continuous elastic thrust. This thrust acts on the valve seat, so that the valve seat sealing surface is always tightly abutting against the outer side of the valve plate 6, thereby forming a dynamic compensation seal. When the valve needs to be locked in the closed position, the valve plate 6 must first be completely closed. At this time, the guide bushing 16 at the end of the valve stem 10 will align with the preset hole on the fixed bottom valve seat 8 or protective cover 9. The operator can pass the safety pin 13 through the hole and insert it into the guide bushing 16. This makes the rotatable valve stem 10 mechanically connected to the fixed bottom valve seat 8 structure, thereby restricting its rotation. The safety pin 13 itself is connected to the hexagonal bolt 15 on the bottom valve seat 8 by the chain 14. In the whole structure, the bottom of the valve stem 10 is supported by the bottom valve seat 8 and connected to the flanges 2 on both sides by the reinforcing plate 7 to enhance the overall rigidity. Its end is protected by the protective cover 9 and the dust cover 11 fixed by the hexagonal bolt 12.

Claims

1. A compensation assembly for a corrosion-resistant butterfly valve, comprising a valve body (1), characterized in that: Both sides of the valve body (1) are fixedly connected to flanges (2), and multiple mounting holes (3) are opened around the flanges (2). A valve stem (10) is vertically installed inside the valve body (1). A valve plate (6) is fixedly connected to the outside of the valve stem (10). The valve plate (6) is rotatably connected inside the valve body (1). A connecting component is provided at the top of the valve stem (10). A protective component is provided at the bottom of the valve stem (10). A compensation component is provided inside the valve body (1).

2. The compensation assembly for a corrosion-resistant butterfly valve according to claim 1, characterized in that: The connecting assembly includes a top valve seat (4), which is fixedly connected to the top of the valve body (1). A square shaft (5) is provided on the top of the valve stem (10), which is used to connect to an external driving mechanism.

3. The compensation assembly for a corrosion-resistant butterfly valve according to claim 1, characterized in that: The bottom of the valve body (1) is fixedly connected to a bottom valve seat (8), and the two sides of the bottom valve seat (8) are fixedly connected to the two flanges (2) with reinforcing plates (7).

4. The compensation assembly for a corrosion-resistant butterfly valve according to claim 3, characterized in that: The protective assembly includes a protective cover (9), and a dust cover (11) is installed at one end of the protective cover (9) away from the valve body (1). Four hexagonal bolts (12) are arranged around the inside of the dust cover (11). The dust cover (11) and the protective cover (9) are fixed together by the four hexagonal bolts (12). Multiple hexagonal bolts (15) are arranged around the bottom of the bottom valve seat (8), and a snap-fit ​​assembly is provided on the inner and outer sides of the bottom valve seat (8).

5. The compensation assembly for a corrosion-resistant butterfly valve according to claim 4, characterized in that: The end of the valve stem (10) is rotatably connected inside the protective cover (9).

6. The compensation assembly for a corrosion-resistant butterfly valve according to claim 4, characterized in that: The snap-fit ​​assembly includes a safety pin (13), on the top of which a chain (14) is mounted, and one end of the chain (14) away from the safety pin (13) snaps onto the outside of the hexagonal bolt (15).

7. The compensation assembly for a corrosion-resistant butterfly valve according to claim 6, characterized in that: Two guide bushings (16) are provided at the end of the valve stem (10), and the safety pin (13) is inserted into the inside of the guide bushings (16).

8. The compensation assembly for a corrosion-resistant butterfly valve according to claim 1, characterized in that: The valve body (1) has an inner groove (17) circumferentially arranged inside. The compensation component includes a plurality of disc springs (18), which are arranged circumferentially inside the inner groove (17) and abut against the outer side of the valve plate (6).

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