Three-eccentric center butterfly valve

Abstract

The utility model discloses a three-eccentric center butterfly valve, which belongs to the technical field of valves, and comprises a valve body, a valve plate, a valve seat, a valve rod and an actuating mechanism, the valve plate is provided with a valve plate sealing ring through a compression ring, the valve plate sealing ring is in sealing contact with the valve body, an annular cavity is formed on the annular inner side of the valve plate sealing ring, and the valve plate sealing ring is arranged in the annular cavity. The annular cavity is located between the pressing ring and the valve plate, an annular elastic expansion piece is arranged in the annular cavity, and the annular elastic expansion piece applies outward radial elastic force to the valve plate sealing ring. According to the three-eccentric center butterfly valve, through design improvement, the elastic performance and the reliability of a sealing piece are improved, the production and maintenance cost is reduced, the machining technology is simplified, the adaptive capacity under high-pressure, high-temperature and corrosive working conditions is improved, and the service life of the three-eccentric center butterfly valve under the high-pressure, high-temperature and corrosive working conditions is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves, and in particular relates to a triple-eccentric butterfly valve. Background Art

[0002] The triple eccentric butterfly valve is a high-performance butterfly valve designed to solve the sealing problem of traditional butterfly valves under high pressure and frequent operating conditions. The triple eccentric design of the valve includes the eccentricity of the valve shaft relative to the center line of the valve seat, the eccentricity of the valve disc relative to the valve shaft, and the eccentricity of the cone angle of the valve seat sealing surface. This design allows the valve disc (valve plate) to form a press-fit seal with the valve body during the opening and closing process, and the friction is minimized, thereby extending the service life of the valve. At the same time, the width of the sealing band between the valve disc seal and the valve body is increased, and the sealing performance is improved. The triple eccentric butterfly valve is widely used in fluid control systems in the petroleum, chemical, electric power, metallurgy and other industries, and can handle high pressure and corrosive media.

[0003] At present, there are several major deficiencies and disadvantages in the valve plate sealing of the three-eccentric butterfly valve: First, the wide band seal between the valve plate sealing ring and the valve body requires extremely high dimensional accuracy in processing and manufacturing, which increases the production cost and manufacturing difficulty. Since the close contact between the sealing ring and the valve seat directly affects the sealing performance of the valve, even a small dimensional deviation may cause leakage problems, especially in applications under high pressure, high temperature and corrosive media. Secondly, once the valve plate sealing ring is worn or damaged, it is usually not possible to replace a new sealing ring, and it cannot be repaired on site and is scrapped. In addition, since the valve plate sealing material of the traditional three-eccentric butterfly valve is metal and hard materials such as PTFE, its elasticity is poor, which also increases the dependence of the valve plate sealing ring on processing accuracy. Any manufacturing deviation may cause the valve plate sealing ring to be unable to completely fit the valve body sealing band, thereby affecting the sealing effect and even damaging the valve. Finally, these problems in the valve plate sealing of the three-eccentric butterfly valve limit its wide application in some high-precision applications, especially in fields with extremely high requirements for sealing performance, such as nuclear energy and fine chemicals. In summary, although the triple-eccentric butterfly valve has many advantages in fluid control systems, the design and manufacturing difficulties in valve plate sealing are still key issues that need to be solved and improved to improve its reliability and economy. Utility Model Content

[0004] In view of the problems existing in the prior art, the utility model provides a three-eccentric butterfly valve which solves the problems of high dimensional tolerance requirement, low versatility and high maintenance cost of the current valve plate sealing ring.

[0005] The utility model is implemented as follows: a three-eccentric butterfly valve comprises a valve body, a valve plate, a valve seat, a valve stem and an actuator, wherein the valve plate is mounted with a valve plate sealing ring via a pressure ring, and the valve plate sealing ring is in sealing contact with the valve body, and is characterized in that an annular cavity is formed inwardly of the ring of the valve plate sealing ring, the annular cavity is located between the pressure ring and the valve plate, an annular elastic expansion member is arranged in the annular cavity, and the annular elastic expansion member applies a radially outward elastic force to the valve plate sealing ring.

[0006] In the above technical solution, preferably, the annular elastic expansion member is in sealing contact with the annular end surface of the pressure ring and the annular end surface of the valve plate.

[0007] In the above technical solution, preferably, the valve plate sealing ring is radially floatingly arranged between the valve plate and the pressure ring.

[0008] In the above technical solution, preferably, the annular elastic expansion member is an O-shaped rubber sealing ring or an O-shaped rubber sealing ring coated with PTFE.

[0009] In the above technical solution, preferably, the valve plate sealing ring is a PTFE sealing ring.

[0010] The three-eccentric butterfly valve proposed in the utility model has many significant advantages and effects in valve sealing, which comprehensively improves its performance and application value. First, by providing a certain floatability for the valve sealing ring during assembly, and setting an annular elastic expansion piece on the inside to continuously apply an outward expansion elastic force, the reliability and stability of the seal are guaranteed. Such a design allows the dimensional tolerance of the valve plate sealing ring to be appropriately increased, thereby increasing the interference and elasticity of the sealing ring, further improving the sealing performance of the valve, and reducing the risk of leakage caused by slight dimensional deviations.

[0011] Secondly, the floating property of the valve seal ring during assembly significantly reduces the difficulty of processing the three-eccentric butterfly valve, and the processing technology is simpler and more efficient. This improvement solves the problem that the valve plate and the valve plate seal ring must be fixed and processed at the same time in the traditional three-eccentric metal valve. In particular, by designing the annular elastic expansion piece as an O-shaped rubber seal ring or an O-shaped rubber seal ring coated with PTFE, the elasticity of the PTFE valve plate seal ring is increased, making it easier to realize split processing. This not only improves production efficiency and reduces manufacturing costs, but also reduces dependence on high-precision processing equipment and broadens the adaptability of processing conditions and environments.

[0012] In addition, the improved triple eccentric butterfly valve is more convenient and economical to maintain and replace the seal ring. Due to the increased dimensional tolerance of the seal ring and the enhanced versatility, the need for custom manufacturing is reduced, and the spare parts inventory and maintenance costs are reduced. The floating design of the seal ring also makes the installation and adjustment of the seal ring easier, shortens the maintenance time, and improves the operating efficiency and availability of the equipment.

[0013] At the same time, this improved design enables the triple eccentric butterfly valve to have stronger adaptability and longer service life under harsh working conditions such as high temperature and corrosive media. The improvement of sealing performance and processing technology enables the valve to maintain stable performance and reliable sealing effect under these extreme conditions, reducing downtime and production losses caused by frequent maintenance and replacement of parts.

[0014] In short, the design improvement of the three-eccentric butterfly valve proposed by the utility model not only significantly improves the sealing performance and reliability of the valve, reduces the production and maintenance costs, but also simplifies the processing technology and improves the adaptability and service life of the valve under various working conditions. These advantages and effects make the three-eccentric butterfly valve have a wider application prospect and significant technical advantages in fluid control systems in the petroleum, chemical, electric power, metallurgy and other industries. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the utility model;

[0016] Figure 2 It is a cross-sectional view of the utility model;

[0017] Figure 3 yes Figure 2 Enlarged view of part A in the middle;

[0018] Figure 4 It is a schematic diagram of the connection structure of the valve plate, the pressure ring and the valve plate sealing ring in the utility model;

[0019] Figure 5 yes Figure 4 Exploded diagram. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail in combination with the embodiments below. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.

[0021] In order to solve the current problems of high dimensional tolerance requirements, low versatility and high maintenance costs of valve plate sealing rings, the utility model provides a three-eccentric butterfly valve. The three-eccentric butterfly valve of the utility model improves the sealing performance and reliability, reduces the production and maintenance costs, simplifies the processing technology, and enhances the adaptability and service life under high pressure, high temperature and corrosive working conditions. In order to further illustrate the structure of the utility model, the detailed description is as follows in conjunction with the attached drawings:

[0022] See also Figure 1-Figure 5, a triple eccentric butterfly valve, comprising a valve body, a valve plate 1, a valve seat 2, a valve stem 3 and an actuator. The above-mentioned structural parts are known structures of conventional triple eccentric butterfly valves. The valve body is the main shell of the butterfly valve, which is used to withstand fluid pressure and connect to the pipeline system. The valve plate is a key component of the butterfly valve, which is responsible for regulating and controlling the flow of the fluid. The valve plate of the triple eccentric butterfly valve is designed to be three-eccentric, so that it is separated from the valve seat when closed, reducing wear and leakage. The valve seat is an annular component inside the valve body, which is in sealing contact with the valve plate to ensure the sealing performance when the valve is closed. The valve seat of the triple eccentric butterfly valve is usually made of metal material to improve high temperature resistance and corrosion resistance. The valve stem connects the valve plate and the actuator, transmits the rotational motion of the actuator to the valve plate, and opens or closes the valve plate. The actuator can be manual, pneumatic, electric or hydraulic, and is used to drive the valve stem to rotate, thereby controlling the opening and closing of the valve plate.

[0023] The valve plate is installed with the valve plate sealing ring 5 through the pressure ring 4, and the valve plate sealing ring is in sealing contact with the valve body. An annular stop is processed on the outer edge of the end face of the valve plate, and the pressure ring is installed on this stop through fasteners. The valve plate sealing ring is a PTFE sealing ring, which is floatingly arranged between the valve plate and the pressure ring. The floating arrangement described here refers to the radial movable gap between the valve plate sealing ring, the valve plate sealing ring, the pressure ring and the valve plate. When the inner side of the valve plate sealing ring is subjected to radial pressure from the outside, the valve plate sealing ring will produce outward expansion deformation. That is, an annular cavity is formed on the inner side of the valve plate sealing ring, and the annular cavity is located between the pressure ring and the valve plate. An annular elastic expansion member is arranged in the annular cavity, and the annular elastic expansion member applies radial external elastic force to the valve plate sealing ring. The annular elastic expansion member is in sealing contact with the annular end face of the pressure ring and the annular end face of the valve plate.

[0024] PTFE seals are high-performance sealing materials that are widely used in various industrial fields. Made of polytetrafluoroethylene (PTFE), they have excellent chemical resistance, high temperature resistance and low friction coefficient, and can maintain stable sealing performance in extreme environments. PTFE seals are commonly used in chemical, food processing, electronics and mechanical engineering, and are especially suitable for applications that require high cleanliness and corrosion resistance. PTFE seals exhibit unique deformation characteristics when subjected to internal pressure. Because PTFE materials have a low elastic modulus and good plasticity, when the inner side of the seal is subjected to pressure, it will expand outward. This expansion structural characteristic enables the PTFE seal to better adapt to the slight unevenness of the contact surface, thereby improving the sealing effect. This feature not only enhances the tightness of the seal, but also effectively prevents fluid leakage and ensures the reliable operation of the system. When designing and using PTFE seals, it is necessary to fully consider its deformation characteristics under pressure, and reasonably select the size and preload of the seal to ensure the best sealing performance and service life. In summary, PTFE sealing rings are an ideal choice for achieving efficient and reliable sealing due to their excellent material properties and unique deformation behavior.

[0025] In this embodiment, the annular elastic expansion member is an O-shaped rubber sealing ring 6. The O-shaped rubber sealing ring is arranged on the inner side of the annular PTFE sealing ring to provide continuous outward expansion elastic force, thereby ensuring reliable sealing between the PTFE sealing ring and the valve body. This design combines the elasticity of the O-shaped rubber sealing ring and the chemical corrosion resistance of the PTFE material. Through the full-time elastic force of the rubber sealing ring, the PTFE sealing ring is always in close contact with the surface of the valve body to compensate for deformation caused by pressure changes or temperature fluctuations. This not only improves the stability and durability of the sealing system, but also enhances the sealing effect.

[0026] In this technical solution, in the typical structure of the traditional three-eccentric metal valve, a valve plate O-shaped rubber seal ring is added between the valve plate and the valve plate seal ring to increase the elasticity of the valve plate seal, so that the valve plate seal ring is floating relative to the valve plate during installation, which can increase the interference and elasticity of the valve plate seal ring, making the sealing performance of the three-eccentric seal ring more reliable, and making the three-eccentric seal ring replaceable, thereby improving the production efficiency of the valve and changing the performance of the traditional three-eccentric metal valve that cannot be repaired. This design solves the problem that the valve plate seal ring of the three-eccentric metal valve cannot be replaced, and the valve plate seal ring and the valve plate seal O-ring can be replaced on site.

[0027] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A triple eccentric butterfly valve, comprising a valve body, a valve plate, a valve seat, a valve stem and an actuator, wherein the valve plate is mounted with a valve plate sealing ring through a pressure ring, and the valve plate sealing ring is in sealing contact with the valve body, characterized in that: An annular cavity is formed inwardly of the valve plate sealing ring, and the annular cavity is located between the pressure ring and the valve plate. An annular elastic expansion member is arranged in the annular cavity, and the annular elastic expansion member applies radially outward elastic force to the valve plate sealing ring.

2. The triple eccentric butterfly valve according to claim 1, characterized in that: The annular elastic expansion member is in sealing contact with the annular end surface of the pressure ring and the annular end surface of the valve plate.

3. The triple eccentric butterfly valve according to claim 2, characterized in that: The valve plate sealing ring is radially floatingly arranged between the valve plate and the pressure ring.

4. The triple eccentric butterfly valve according to claim 3, characterized in that: The annular elastic expansion member is an O-shaped rubber sealing ring or an O-shaped rubber sealing ring coated with PTFE.

5. The triple eccentric butterfly valve according to claim 4, characterized in that: The valve plate sealing ring is a PTFE sealing ring.

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