Split type pure metal two-way sealing five-eccentric center butterfly valve using eccentric valve rod

Abstract

The invention discloses a split type pure metal two-way sealing five-eccentric center butterfly valve using an eccentric valve rod. The split type pure metal two-way sealing five-eccentric center butterfly valve comprises the integrated eccentric valve rod, a valve plate and a valve body. The integrated eccentric valve rod is a three-section type stepped valve rod and comprises an upper edge section, a lower edge section and a middle section located between the upper edge section and the lower edge section in the axial direction of the valve rod. The upper edge section and the lower edge section have the same diameter, the diameter of the middle section is larger than that of the two edge sections, and the middle section is tangent to the excircles of the upper edge section and the lower edge section; in the axial direction of the valve rod, an eccentric distance s exists between the central axis O'of the middle section and the central axial direction O of the upper section and the lower section. The eccentric distance s can make up installation errors, the situation that in the prior art, the installation errors are made up by changing the compression amount of the valve body sealing ring gasket is avoided, and then the sealing reliability of the valve body sealing ring gasket is guaranteed. And meanwhile, an annular gap is formed and is eccentrically combined and matched with the valve rod in function to play a role together.

Description

Technical Field

[0001] This invention relates to an eccentric butterfly valve, and more particularly to a split-type pure metal bidirectional sealing five-eccentric butterfly valve using an eccentric valve stem. Background Technology

[0002] Traditional pure metal eccentric butterfly valves, mainly double, triple, and quadruple eccentric butterfly valves, require high installation precision and are difficult to adjust. Errors in the sealing surface along the pipeline axial direction are difficult to eliminate through adjustment, thus affecting the sealing effect and leading to excessive leakage. Current solutions mainly include: 1. Adding adjusting shims to the sealing gasket reduces the fit clearance, ensuring a tight seal. The advantage of this method is its simplicity and ease of operation, requiring no additional machining of the valve plate components. The disadvantages are that the shim thickness is highly random, making it difficult to find a suitable shim within a continuous dimensional range; repeated adjustments and replacements not only reduce efficiency but also increase the risk of damage to the sealing surface; furthermore, it only applies to clearance fits between the sealing surfaces and cannot solve interference fit problems.

[0003] 2. A split design is adopted, where a sealing ring is installed on both the valve body and the valve plate to form a floating sealing pair. During installation, the two sealing rings are tightened together using bolts. The advantage of this method is ease of adjustment; the sealing pair can usually be adjusted to the correct position in one go, and it can improve the reverse sealing performance of the butterfly valve. The disadvantage is that the adjustment of the sealing pair is achieved by changing the gasket compression, which can easily lead to unstable gasket compression force, resulting in an initial state that is too loose or too tight, affecting the sealing effect and gasket lifespan.

[0004] 3. A multi-layer steel plate sealing ring is used, which involves stacking multiple layers of thin steel plates and brazing the sealing surface. The advantage of this method is improved self-adaptive performance of the sealing pair; repeated butterfly valve operation causes the thin steel plates to deform under pressure, resulting in a better fit. The disadvantages are high processing costs and relatively complex processes; the thin steel plates are more prone to wear and scratches during self-adaptive deformation, damaging the sealing surface; and the relatively lower stiffness of the thin steel plates makes them susceptible to abnormal deformation due to other factors, thereby damaging the sealing surface and reducing sealing performance. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to address the shortcomings of the prior art by providing a split-type pure metal bidirectional sealing five-eccentric butterfly valve using an eccentric valve stem. This split-type pure metal bidirectional sealing five-eccentric butterfly valve, through structural design, introduces an integral eccentric valve stem on the basis of a four-eccentric butterfly valve, thus forming a fifth eccentric valve stem eccentricity. During installation, the position of the sealing pair is adjusted by rotating the integral eccentric valve stem to achieve the optimal sealing state. It can achieve a tight fit of the sealing pair without changing the gasket compression, and can solve problems such as clearance fit and interference fit of the sealing pair.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A split-type pure metal bidirectional sealing five-eccentric butterfly valve using an eccentric valve stem includes an integral eccentric valve stem, valve plate, and valve body.

[0007] Furthermore, the integrated eccentric valve stem is a three-section stepped valve stem, which includes an upper section, a lower section, and a middle section located between the upper and lower sections along the valve stem axis; the upper and lower sections have the same diameter, the middle section has a larger diameter than the two sections, and the middle section is tangent to the outer circles of the upper and lower sections; The valve stem is eccentric, and there is an eccentricity s between the central axis O' of the middle section and the central axis O of the upper and lower side sections in the valve stem axial direction.

[0008] Furthermore, a valve body sealing ring is formed in the inner cavity of the valve body, and a valve plate sealing ring is formed on the side of the valve plate near the valve body sealing ring. The valve body sealing ring and the valve plate sealing ring constitute a sealing pair. The integral eccentric valve stem is rigidly fixed to the valve plate along the radial direction of the valve body. When the valve plate is closed, after the integral eccentric valve stem drives the valve plate to rotate into position, the sealing surfaces of the valve body sealing ring and the valve plate sealing ring can achieve seamless sealing and fully fit.

[0009] Furthermore, an annular protrusion is formed in the inner cavity of the valve body, and a first step is formed on the side of the valve body sealing ring near the annular protrusion. The first step matches the size of the annular protrusion, and a valve body sealing ring gasket is sandwiched between the first step and the annular protrusion.

[0010] Furthermore, a pressure ring retraction device is also arranged at the valve body sealing ring. The valve body pressure ring retraction device includes a valve body pressure ring, a valve body dividing ring, and a pressure ring screw. The valve body pressure ring is assembled at the valve body sealing ring. An annular groove is pre-cut on the side of the valve body cavity near the valve body pressure ring for installing the valve body dividing ring. After the valve body pressure ring retracts, it fits tightly with the valve body dividing ring. The valve body pressure ring and the valve body dividing ring are fixed by the pressure ring screw. The head of the pressure ring screw presses against the valve body dividing ring and the valve body pressure ring, and the end extends out to press against the valve body sealing ring.

[0011] Furthermore, an annular valve plate step is formed on one side of the valve plate near the valve body sealing ring, and a valve plate sealing ring is fitted at the annular valve plate step; in the axial direction of the valve body, the valve plate sealing ring and the annular valve plate step are tightly fitted, and a valve plate sealing ring gasket is sandwiched between the valve plate sealing ring and the annular valve plate step; in the radial direction of the valve body, an annular gap is formed between the inner hole of the valve plate sealing ring and the annular valve plate step.

[0012] Furthermore, the radial dimension m of the annular gap is 1-2 mm.

[0013] Furthermore, it also includes four other eccentricities: Axial eccentricity means that, in the axial direction of the pipeline, the rotation center line O of the valve plate is offset by a distance c from the center surface f of the valve plate sealing ring. Radial eccentricity means that in the radial direction of the pipeline, there is an eccentricity e between the rotation centerline O of the valve plate and the centerline k of the valve body. Angle eccentricity means that, on the mid-section, the cone centerline of the sealing pair is at an angle φ to the valve body centerline k. The cone is eccentric. At the bottom of the cone, the elliptical cone bottom surface of the five-eccentric butterfly valve has an offset of h from the circular cone bottom surface.

[0014] Furthermore, the eccentricity s of the valve stem eccentricity ranges from 0.2mm to 0.5mm.

[0015] Furthermore, the present invention also provides a valve plate installation and debugging method, based on the aforementioned split-type pure metal bidirectional sealing five-eccentric butterfly valve using an eccentric valve stem, comprising the following steps: Step 1: Install the valve body sealing ring: Before installing the valve body sealing ring into the valve body cavity from left to right, first put the valve body sealing ring gasket on the side wall of the valve body sealing ring near the annular protrusion of the valve body. After the valve body sealing ring is pushed into the valve body cavity and installed in place, the valve body sealing ring gasket is sandwiched between the valve body sealing ring and the valve body. Step 2: Install the valve body pressure ring: Install the valve body pressure ring from left to right to the valve body sealing ring. At this time, the valve body pressure ring is fitted and assembled against the left side wall of the valve body sealing ring. Step 3: Pre-cut an annular groove: Pre-cut an annular groove on the side of the valve body cavity near the valve body pressure ring for installing the valve body dividing ring. Step 4: Install the valve body dividing ring: The valve body dividing ring is made of a circular ring cut into three or more segments; Step 5: Assemble the three or more segments of the valve body dividing ring into the annular groove of the valve body cavity one by one. The three or more segments of the valve body dividing ring should fit tightly together to form a complete ring. Step 6: Move the valve body pressure ring back from right to left to the valve body dividing ring. At this time, the valve body pressure ring and the valve body dividing ring are tightly fitted and the valve body pressure ring is held in place by the valve body dividing ring, so the valve body pressure ring will not fall off. Step 7: The valve body pressure ring has pressure ring screw holes evenly opened upwards. Tighten the pressure ring screws to install them into each pressure ring screw hole. The pressure ring screws protrude from each pressure ring screw hole. At this time, the protruding part of the pressure ring screw presses against the valve body sealing ring. Step 8: Place the valve plate sealing ring and valve plate sealing ring gasket onto the annular valve plate step, and then cover it with the valve plate pressure ring; screw the screw into the valve plate pressure ring so that the pressure ring presses the valve plate sealing ring in place and prevents it from coming loose; Step 9: Rotate the integrated eccentric valve stem to gradually bring the valve plate sealing ring closer to the valve body sealing ring. By controlling the torque of the integrated eccentric valve stem, the sealing rings are made to fit together tightly enough.

[0016] Furthermore, it also includes a step of rigidly fixing the integrated eccentric valve stem to the valve plate, including steps 10-12: Step 10: Drill pin holes: By rotating the integrated eccentric valve stem, the sealing surface is adjusted to a seamless sealing fit (i.e., a complete seal, which is the optimal position); Use a clamp to maintain the relative position between the integral eccentric valve stem and the valve plate, ensuring that the two do not move relative to each other; Use a drill bit to drill a hole from the back of the valve plate, with the center line of the hole tangent to the middle section of the integral eccentric valve stem; After drilling, cylindrical surfaces are formed on the middle section of the integral eccentric valve stem and on the valve plate; Step 11, drive in the pin: Drive a pin into the pre-drilled hole, ensuring the pin matches the hole's dimensions; The pin is in close contact with the middle section of the integrated eccentric valve stem and the cylindrical surface on the valve plate. At this time, the integrated eccentric valve stem and the valve plate are rigidly fixed and cannot rotate relative to each other. The driving torque borne by the integrated eccentric valve stem is transmitted to the valve plate through the squeezing action of the pin. Step 12, Weld the pins: Weld the end of the pin to fuse it with the valve plate, preventing the pin from falling off during the operation of the butterfly valve; at this time, the integrated eccentric valve stem, valve plate and pin form a stable rigid fixation.

[0017] The present invention has the following beneficial effects: 1. This application utilizes the eccentricity of the integrated eccentric valve stem to achieve the adjustability of the valve plate position. This eccentricity s can compensate for installation errors, avoiding the need to compensate for installation errors by changing the compression of the valve body sealing ring gasket in the prior art, thereby ensuring the sealing reliability of the valve body sealing ring gasket. At the same time, due to the existence of the eccentricity s of the valve stem eccentricity, when the integrated eccentric valve stem is rotated and adjusted, the valve plate will not only have axial displacement in the pipeline, but also radial displacement in the pipeline. The radial displacement of the valve plate will cause the valve plate sealing ring to shift, affecting the sealing accuracy. Therefore, in the radial direction, the inner hole of the valve plate sealing ring and the annular valve plate step form an annular gap, which can compensate for the radial offset of the valve plate sealing ring, so that the sealing ring always remains in the optimal position. This annular gap works in conjunction with the eccentric valve stem to play a joint role.

[0018] 2. Through structural design, this invention introduces an integrated eccentric valve stem on the basis of a four-eccentric butterfly valve, thus forming a fifth eccentric valve stem eccentricity. During installation, the position of the sealing pair is adjusted by rotating the integrated eccentric valve stem to achieve the best sealing state. It can achieve a tight fit of the sealing pair without changing the gasket compression, and can solve problems such as clearance fit and interference fit of the sealing pair.

[0019] 3. By adjusting the integrated eccentric valve stem, not only can the fitting accuracy of the sealing surface be guaranteed, thereby improving the sealing performance of the pure metal butterfly valve, the leakage level can reach Class V (ANSI / FCI 70-2 control valve plate and valve seat leakage) or above; it can also reduce the friction between the sealing surfaces, reduce the wear between the sealing pairs, extend the service life of the butterfly valve; and reduce the torque required for the valve plate to open and close, thus reducing energy consumption.

[0020] 4. The fixing and debugging method of this application is simple and convenient, and the sealing surfaces can fit tightly together, resulting in a good sealing effect. Due to the introduction of the eccentric valve stem, there is no need to use adjusting shims during installation. It is only necessary to rotate the eccentric valve stem to drive the valve plate to make a slight movement. The slight movement occurs in both the horizontal direction (valve body axial direction) and the vertical direction (valve body radial direction). The slight movement in the horizontal direction can be used to eliminate the cumulative error of the sealing pair (the valve body sealing ring and the valve plate sealing ring constitute the sealing pair). The slight movement in the vertical direction can be eliminated by the gap between the valve plate and the inner hole of the valve plate sealing ring, without having any additional impact on the sealing pair.

[0021] The sealing surface exhibits low friction, simultaneously resolving issues related to both clearance and interference fits. Because the valve stem's eccentricity is designed to exceed the interference fit, when rotating the eccentric valve stem, the valve plate can be initially positioned at its furthest point. Regardless of whether the sealing surface was originally in a clearance or interference fit state, it will now be in a clearance state. Then, by rotating the integrated eccentric valve stem, the sealing surfaces gradually come together. During this process, friction on the sealing surfaces is minimal, significantly reducing the possibility of damage. Since it is already adjusted to its optimal state during installation, subsequent break-in will be smoother, friction will be lower, and the service life of the sealing surface will be longer.

[0022] Furthermore, the sealing performance of the gaskets is not compromised, and bidirectional sealing performance is ensured. During installation and commissioning, the gaskets on the valve body and valve plate are first adjusted to their optimal positions. At this point, the gasket compression allows for deformation during reverse sealing, ensuring reverse sealing performance. Finally, the angle of the eccentric valve stem is adjusted to achieve forward sealing, thus guaranteeing the reliability of bidirectional sealing. Attached Figure Description

[0023] Figure 1 This is a cross-sectional view along the radial direction of the valve body of a split-type pure metal bidirectional sealing five-eccentric butterfly valve using an eccentric valve stem according to the present invention.

[0024] Figure 2 yes Figure 1 A magnified view of a portion at point B.

[0025] Figure 3 This is an axial sectional view of the integral eccentric valve stem of the present invention.

[0026] Figure 4 yes Figure 3 View in the Z direction.

[0027] Figure 5 yes Figure 1 A cross-sectional view along the NN direction.

[0028] Figure 6 This is a schematic diagram of a method for rigidly fixing and adjusting an integrated eccentric valve stem and valve plate.

[0029] Figure 7 This is a schematic diagram of the drilling pin hole in the method of rigidly fixing and adjusting the integrated eccentric valve stem and valve plate.

[0030] Figure 8 This is a schematic diagram showing the annular gap structure formed between the inner hole of the valve plate sealing ring and the steps of the annular valve plate.

[0031] Figure 9 This is a schematic diagram of the eccentric structure of a split-type pure metal bidirectional sealing five-eccentric butterfly valve using an eccentric valve stem, according to the present invention.

[0032] Figure 10 yes Figure 9 A magnified view of a portion of the image.

[0033] Figure 11 yes Figure 9 View from direction A.

[0034] Figure 12 This is a schematic diagram of the valve body pressure ring retraction process.

[0035] Figure 13 This is a schematic diagram of the valve body dividing ring assembly.

[0036] Among them are: 1. Integrated eccentric valve stem; 11. Middle section; 12. Upper section; 13. Lower section; 2. Valve plate; 21. Valve plate sealing ring; 22. Annular valve plate step; 23. Annular gap; 3. Valve body; 31. Valve body sealing ring; 32. Pressure ring screw; 33. Valve body sealing ring gasket; 34. Valve body pressure ring; 35. Valve body dividing ring; 36. Annular groove. Detailed Implementation

[0037] The present invention will now be described in further detail with reference to the accompanying drawings and specific preferred embodiments.

[0038] In the description of this invention, it should be understood that the terms "left side," "right side," "upper part," "lower part," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. "First," "second," etc., do not indicate the importance of the components, and therefore should not be construed as a limitation of this invention. The specific dimensions used in this embodiment are only for illustrating the technical solution and do not limit the scope of protection of this invention.

[0039] like Figure 1-13 As shown, a split-type pure metal bidirectional sealing five-eccentric butterfly valve using an eccentric valve stem includes an integral eccentric valve stem 1, a valve plate 2, and a valve body 3.

[0040] The integrated eccentric valve stem is a three-section stepped valve stem, which, along the valve stem axis, includes an upper section 12, a lower section 13, and a middle section 11 located between the upper and lower sections, such as... Figure 3 As shown, the upper and lower side sections and the middle section located between the two side sections form an integral eccentric valve stem; the upper side section 12 and the lower side section 13 have the same diameter, the middle section 11 has a larger diameter than the two side sections, and the middle section is tangent to the outer circles of the upper and lower side sections. Thus, the middle section forms a stepped structure with the upper and lower side sections respectively.

[0041] Furthermore, a split-type pure metal bidirectional sealing five-eccentric butterfly valve using an eccentric valve stem, wherein the eccentricity includes valve stem eccentricity, such as in the valve stem axial direction. Figure 3 As shown, the upper and lower side sections 12 and 13 are on the same central axis. There is an eccentricity s between the central axis O' of the middle section 11 of the integrated eccentric valve stem and the central axis O of the upper and lower side sections 12 and 13. This application utilizes the eccentricity of the integrated eccentric valve stem to achieve the adjustability of the valve plate position. This eccentricity s can compensate for installation errors and avoids the need to compensate for installation errors by changing the compression of the valve body sealing ring gasket in the prior art, thereby ensuring the sealing reliability of the valve body sealing ring gasket.

[0042] Furthermore, such as Figure 2 As shown, a valve body sealing ring 31 is formed in the inner cavity of the valve body, and a valve plate sealing ring 21 is formed on the side of the valve plate near the valve body sealing ring. The valve body sealing ring 31 and the valve plate sealing ring 21 constitute a sealing pair. The integral eccentric valve stem 1 and the valve plate 2 are rigidly fixed along the radial direction of the valve body (perpendicular to the axial direction of the valve body). When the valve plate is closed, after the integral eccentric valve stem 1 drives the valve plate 2 to rotate into place, the sealing surfaces of the valve body sealing ring 31 and the valve plate sealing ring 21 can achieve seamless sealing and fully fit.

[0043] In one embodiment, a valve body annular protrusion is formed in the inner cavity of the valve body, and a first step is formed on the side of the valve body sealing ring 31 near the valve body annular protrusion. The first step matches the valve body annular protrusion in size to achieve seamless sealing installation.

[0044] Furthermore, in order to improve sealing, a valve body sealing ring gasket 33 is sandwiched between the first step and the annular protrusion of the valve body.

[0045] In one embodiment, a pressure ring retraction device is further arranged at the valve body sealing ring 31. The valve body pressure ring retraction device includes a valve body pressure ring 34, a valve body dividing ring 35, and a pressure ring screw 32; the valve body sealing ring 31 is equipped with the valve body pressure ring 34, such as... Figure 13 As shown, an annular groove 36 is pre-cut on the side of the valve body cavity near the valve body pressure ring for installing the valve body dividing ring 35; after the valve body pressure ring 34 retracts, it fits tightly with the valve body dividing ring and is fixed by pressure ring screws 32. The head of the pressure ring screw presses the valve body dividing ring and the valve body pressure ring, and the end extends out to press the valve body sealing ring.

[0046] In one embodiment, further, an annular valve plate step 22 is formed on one side of the valve plate near the valve body sealing ring, such as... Figure 2 and 8 As shown, from the radial cross-section of the valve body, the annular valve plate step 22 is in the shape of a "┛", and a valve plate sealing ring 21 is installed at the annular valve plate step.

[0047] Furthermore, axially upwards in the valve body, the valve plate sealing ring is tightly fitted with the annular valve plate step.

[0048] Furthermore, axially above the valve body, a valve plate sealing ring gasket is sandwiched between the valve plate sealing ring and the annular valve plate step; such as Figure 8 As shown, if necessary, a groove is cut into the valve plate, a gasket is placed in the groove, and the valve plate sealing ring presses against the valve plate sealing ring gasket to form a seal.

[0049] Furthermore, in the radial direction of the valve body, the inner hole of the valve plate sealing ring and the step of the annular valve plate form an annular gap 23. Due to the eccentricity s of the valve stem, when the integrated eccentric valve stem is rotated and adjusted, the valve plate will not only be displaced axially in the pipeline, but also radially. The radial displacement of the valve plate will cause the valve plate sealing ring to shift, affecting the sealing accuracy. Therefore, in the radial direction, the inner hole of the valve plate sealing ring and the step of the annular valve plate form an annular gap, which can compensate for the radial shift of the valve plate sealing ring, so that the sealing ring is always kept in the optimal position. This annular gap works in conjunction with the eccentric valve stem combination to play a joint role.

[0050] Furthermore, such as Figure 8 As shown, the radial dimension m of the annular gap is 1-2 mm.

[0051] By optimizing and adjusting the integrated eccentric valve stem, the valve body sealing ring gasket and the valve plate sealing ring gasket are placed in the optimal compression position, ensuring that the valve plate sealing ring and the valve body sealing ring are fully fitted. Then, a fixing pin is used to connect the valve plate and the integrated eccentric valve stem, ensuring that the valve plate is in the best fit condition.

[0052] Furthermore, such as Figure 9-11 As shown, a split-type pure metal bidirectional sealing five-eccentric butterfly valve using an eccentric valve stem includes four additional eccentric components: like Figure 9-10 As shown, there is axial eccentricity. In the axial direction of the pipeline, there is an offset c between the rotation center line O of the valve plate and the center surface f of the valve plate sealing ring. It should be noted that the central axis O of the upper and lower side sections 12 and 13 is the rotation center line O of the valve plate. Radial eccentricity means that in the radial direction of the pipeline, there is an eccentricity e between the rotation centerline O of the valve plate and the centerline k of the valve body. Angle eccentricity means that, on the mid-section, the cone centerline of the sealing pair is at an angle φ to the valve body centerline k. like Figure 10-11 As shown, the cone is eccentric, and at the bottom of the cone, the elliptical cone bottom surface of the five-eccentric butterfly valve has an offset of h from the circular cone bottom surface.

[0053] Furthermore, the eccentricity s of the valve stem eccentricity ranges from 0.2mm to 0.5mm.

[0054] This invention, through structural design, introduces an integrated eccentric valve stem into the basic four-eccentric butterfly valve, thus forming a fifth eccentric valve stem eccentricity. During installation, the position of the sealing pair is adjusted by rotating the integrated eccentric valve stem to achieve optimal sealing. This allows for a tight fit of the sealing pair without changing the gasket compression, resolving issues related to clearance fits and interference fits in the sealing pair.

[0055] By adjusting the integrated eccentric valve stem, not only can the fitting accuracy of the sealing surface be guaranteed, thereby improving the sealing performance of the pure metal butterfly valve, the leakage level can reach Class V (ANSI / FCI 70-2 control valve plate and seat leakage) or above; it can also reduce the friction between the sealing surfaces, reduce the wear between the sealing pairs, extend the service life of the butterfly valve; and reduce the torque required for the valve plate to open and close, thus reducing energy consumption.

[0056] This application also provides a method for installing and debugging a valve plate, such as... Figure 12 As shown, the steps include the installation and debugging of the valve body sealing ring, the retraction of the valve body pressure ring, the installation and debugging of the valve plate sealing ring, and the rigid fixing of the integrated eccentric valve stem and valve plate.

[0057] A valve plate installation and commissioning method includes the following steps: Step 1 is the installation and commissioning procedure for the valve body sealing ring: Step 1: Install valve body sealing ring 31: Before installing valve body sealing ring 31 into the valve body cavity from left to right, first put valve body sealing ring gasket 33 on the side wall of valve body sealing ring 31 near the annular protrusion of valve body. After valve body sealing ring 31 is pushed into the valve body cavity and installed in place, valve body sealing ring gasket 33 is sandwiched between valve body sealing ring and valve body. Steps 2-7 are the valve body pressure ring retraction steps: Step 2, Install valve body pressure ring 34: Install valve body pressure ring 34 from left to right to valve body sealing ring 31. At this time, valve body pressure ring is fitted to the left side wall of valve body sealing ring. Step 3: Pre-open an annular groove 36: Pre-open an annular groove 36 on the side of the valve body cavity near the valve body pressure ring for installing the valve body dividing ring 35. Step 4, as follows Figure 13 As shown, the valve body dividing ring 35 is installed: the valve body dividing ring is a circular ring cut into three or more segments; The valve body dividing ring 35 satisfies the following radial dimension: d1>d2, where d1=D-D', d2=Dd; d1 is the radial dimension of the valve body dividing ring; d2 is the radial depth dimension of the annular channel; D is the radius of the outer ring of the valve body dividing ring / the radius of the annular groove; D' is the radius of the inner ring of the valve body dividing ring; d is the radius of the valve body cavity; Step 5, as follows Figure 13 As shown, the three or more segments of the valve body dividing ring are assembled one by one into the annular groove 36 of the valve body cavity. The three or more segments of the valve body dividing ring fit tightly against each other and are assembled to form a complete ring. Step 6: Move the valve body pressure ring 34 back from right to left to the valve body dividing ring. At this time, the valve body pressure ring 34 is tightly fitted with the valve body dividing ring, and the valve body pressure ring is held in place by the valve body dividing ring, so the valve body pressure ring will not fall off. In one embodiment, further, since d1 > d2, a ring-shaped protrusion is formed at the portion of the valve body dividing ring that extends beyond the annular groove. To improve the fit between the valve body pressure ring and the valve body dividing ring, this step further includes: An annular step is provided on one side wall of the valve body pressure ring near the valve body dividing ring, as shown in the figure. From the cross section, the annular step is "┛" shaped, and the annular step is tightly fitted and assembled with the valve body dividing ring. In one embodiment, the annular pressure ring step has an axial dimension equal to the axial dimension of the valve body segment ring, as shown in the figure. From the radial section, the left side of the valve body segment ring is flush with the left side of the valve body pressure ring; its radial dimension satisfies: Δd=d1-d2; where Δd is the radial dimension of the annular pressure ring step. Step 7: The valve body pressure ring has pressure ring screw holes evenly opened upwards. Tighten the pressure ring screw 32 to each pressure ring screw hole, and the pressure ring screw protrudes from each pressure ring screw hole. At this time, the protruding part of the pressure ring screw presses against the valve body sealing ring. By controlling the tightening torque of the pressure ring screw, the valve body sealing ring gasket reaches the optimal compression position, which improves the sealing effect. In one embodiment, the head of the pressure ring screw further presses against the valve body dividing ring and valve body pressure ring flush on the left side, thereby further limiting the position.

[0058] Steps 8-10 are the installation and commissioning steps for the valve plate sealing ring: Step 8: Place the valve plate sealing ring 21 and valve plate sealing ring gasket onto the annular valve plate step 22, and then cover it with the valve plate pressure ring; screw the screws into the valve plate pressure ring so that the pressure ring presses the valve plate sealing ring in place and prevents it from coming loose; tighten the screws on the valve plate pressure ring, and control the tightening torque of the screws to make the valve plate sealing ring gasket reach the optimal compression position. Step 9: Rotate the integrated eccentric valve stem to gradually bring the valve plate sealing ring closer to the valve body sealing ring. By controlling the torque of the integrated eccentric valve stem, the sealing rings are made to fit together tightly enough. Steps 10-12 are the steps for rigidly fixing the integrated eccentric valve stem to the valve plate: like Figure 5-7As shown, the integral eccentric valve stem 1 and valve plate 2 are rigidly fixed along the radial direction of the valve body. The steps for rigidly fixing the integral eccentric valve stem and valve plate include: Step 10: Drill the pin holes, such as... Figure 6 As shown in (a): By rotating the integrated eccentric valve stem, the sealing surface is adjusted to a seamless sealing fit (i.e., a complete seal, which is the optimal position); Use a clamp to maintain the relative position between the integral eccentric valve stem and the valve plate, ensuring that the two do not move relative to each other; Use a drill bit to drill a hole from the back of the valve plate, such as Figure 7 As shown, the centerline of the hole is tangent to the middle section 11 of the integral eccentric valve stem; After drilling, cylindrical surfaces are formed on the middle section of the integral eccentric valve stem and on the valve plate; Step 11: Drive in the pin, as shown Figure 6 As shown in (b): Drive a pin into the pre-drilled hole, ensuring the pin matches the hole's dimensions; The pin is in close contact with the middle section of the integrated eccentric valve stem and the cylindrical surface on the valve plate. At this time, the integrated eccentric valve stem and the valve plate are rigidly fixed and cannot rotate relative to each other. The driving torque borne by the integrated eccentric valve stem is transmitted to the valve plate through the squeezing action of the pin. Step 12: Weld the pins, as follows Figure 6 As shown in (c): Weld the end of the pin to fuse it with the valve plate, preventing the pin from falling off during the operation of the butterfly valve; at this time, the integrated eccentric valve stem, valve plate and pin form a stable rigid fixation.

[0059] After the valve plate is debugged and installed, the valve is in operation: when the valve is in the closed position, the actuator provides torque to squeeze the elliptical conical surfaces on the valve body sealing ring and the valve plate sealing ring to achieve a sealing effect; when the valve is opened, the actuator provides torque in the opening direction, which drives the valve plate to rotate, causing the valve plate sealing ring to separate from the valve body sealing ring; the closing process is the opposite, and so on, to realize the operation of the five-eccentric butterfly valve.

[0060] The fixing and debugging method of this application is simple and convenient, and the sealing surfaces can fit tightly together, resulting in a good sealing effect. Due to the introduction of the eccentric valve stem, there is no need to use adjusting shims during installation. It is only necessary to rotate the eccentric valve stem to drive the valve plate to make a slight movement. The slight movement occurs in both the horizontal direction (valve body axial direction) and the vertical direction (valve body radial direction). The slight movement in the horizontal direction can be used to eliminate the cumulative error of the sealing pair (the valve body sealing ring and the valve plate sealing ring constitute the sealing pair). The slight movement in the vertical direction can be eliminated by the gap between the valve plate and the inner hole of the valve plate sealing ring, without having any additional impact on the sealing pair.

[0061] The sealing surface exhibits low friction, simultaneously resolving issues related to both clearance and interference fits. Because the valve stem's eccentricity is designed to exceed the interference fit, when rotating the eccentric valve stem, the valve plate can be initially positioned at its furthest point. Regardless of whether the sealing surface was originally in a clearance or interference fit state, it will now be in a clearance state. Then, by rotating the integrated eccentric valve stem, the sealing surfaces gradually come together. During this process, friction on the sealing surfaces is minimal, significantly reducing the possibility of damage. Since it is already adjusted to its optimal state during installation, subsequent break-in will be smoother, friction will be lower, and the service life of the sealing surface will be longer.

[0062] Furthermore, the sealing performance of the gaskets is not compromised, and bidirectional sealing performance is ensured. During installation and commissioning, the gaskets on the valve body and valve plate are first adjusted to their optimal positions. At this point, the gasket compression allows for deformation during reverse sealing, ensuring reverse sealing performance. Finally, the angle of the eccentric valve stem is adjusted to achieve forward sealing, thus guaranteeing the reliability of bidirectional sealing.

[0063] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0064] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and these equivalent transformations all fall within the protection scope of the present invention.

Claims

1. A split-type pure metal bidirectional sealing five-eccentric butterfly valve using an eccentric valve stem, characterized in that: Includes an integrated eccentric valve stem, valve plate, and valve body; The integrated eccentric valve stem is a three-section stepped valve stem. Along the valve stem axis, it includes an upper section, a lower section, and a middle section located between the upper and lower sections. The upper and lower sections have the same diameter, the middle section has a larger diameter than the two sections, and the middle section is tangent to the outer circles of the upper and lower sections. The valve stem is eccentric, and there is an eccentricity s between the central axis O' of the middle section and the central axis O of the upper and lower side sections in the valve stem axial direction.

2. The split-type pure metal bidirectional sealing five-eccentric butterfly valve using an eccentric valve stem as described in claim 1, characterized in that: A valve body sealing ring is formed in the inner cavity of the valve body, and a valve plate sealing ring is formed on the side of the valve plate near the valve body sealing ring. The valve body sealing ring and the valve plate sealing ring constitute a sealing pair. The integral eccentric valve stem is rigidly fixed to the valve plate along the radial direction of the valve body. When the valve plate is closed, the integral eccentric valve stem drives the valve plate to rotate into position, and the sealing surfaces of the valve body sealing ring and the valve plate sealing ring can achieve seamless sealing and full fit.

3. The split-type pure metal bidirectional sealing five-eccentric butterfly valve using an eccentric valve stem according to claim 2, characterized in that: The valve body has an annular protrusion in its inner cavity. A first step is formed on the side of the valve body sealing ring near the annular protrusion. The first step matches the size of the annular protrusion. A valve body sealing ring gasket is sandwiched between the first step and the annular protrusion.

4. The split-type pure metal bidirectional sealing five-eccentric butterfly valve using an eccentric valve stem according to claim 2, characterized in that: A pressure ring retraction device is also arranged at the valve body sealing ring. The valve body pressure ring retraction device includes a valve body pressure ring, a valve body dividing ring, and a pressure ring screw. The valve body pressure ring is assembled at the valve body sealing ring. An annular groove is pre-cut on the side of the valve body cavity near the valve body pressure ring for installing the valve body dividing ring. After the valve body pressure ring retracts, it fits tightly with the valve body dividing ring. The valve body pressure ring and the valve body dividing ring are fixed by the pressure ring screw. The head of the pressure ring screw presses against the valve body dividing ring and the valve body pressure ring, and the end extends out to press against the valve body sealing ring.

5. The split-type pure metal bidirectional sealing five-eccentric butterfly valve using an eccentric valve stem according to claim 2, characterized in that: An annular valve plate step is formed on one side of the valve plate near the valve body sealing ring, and a valve plate sealing ring is fitted at the annular valve plate step; in the axial direction of the valve body, the valve plate sealing ring and the annular valve plate step are tightly fitted, and a valve plate sealing ring gasket is sandwiched between the valve plate sealing ring and the annular valve plate step; in the radial direction of the valve body, an annular gap is formed between the inner hole of the valve plate sealing ring and the annular valve plate step.

6. The split-type pure metal bidirectional sealing five-eccentric butterfly valve using an eccentric valve stem according to claim 5, characterized in that: The radial dimension m of the annular gap is 1-2 mm.

7. The split-type pure metal bidirectional sealing five-eccentric butterfly valve using an eccentric valve stem according to claim 1, characterized in that: It also includes four other eccentricities: Axial eccentricity means that, in the axial direction of the pipeline, the rotation center line O of the valve plate is offset by a distance c from the center surface f of the valve plate sealing ring. Radial eccentricity means that in the radial direction of the pipeline, there is an eccentricity e between the rotation centerline O of the valve plate and the centerline k of the valve body. Angle eccentricity means that, on the mid-section, the cone centerline of the sealing pair is at an angle φ to the valve body centerline k. The cone is eccentric. At the bottom of the cone, the elliptical cone bottom surface of the five-eccentric butterfly valve has an offset of h from the circular cone bottom surface.

8. The split-type pure metal bidirectional sealing five-eccentric butterfly valve using an eccentric valve stem according to claim 7, characterized in that: The eccentricity s of the valve stem is in the range of 0.2mm-0.5mm.

9. A valve plate installation and debugging method, based on the split-type pure metal bidirectional sealing five-eccentric butterfly valve using an eccentric valve stem as described in any one of claims 3-6, characterized in that: Includes the following steps: Step 1: Install the valve body sealing ring: Before installing the valve body sealing ring into the valve body cavity from left to right, first put the valve body sealing ring gasket on the side wall of the valve body sealing ring near the annular protrusion of the valve body. After the valve body sealing ring is pushed into the valve body cavity and installed in place, the valve body sealing ring gasket is sandwiched between the valve body sealing ring and the valve body. Step 2: Install the valve body pressure ring: Install the valve body pressure ring from left to right to the valve body sealing ring. At this time, the valve body pressure ring is fitted and assembled against the left side wall of the valve body sealing ring. Step 3: Pre-cut an annular groove: Pre-cut an annular groove on the side of the valve body cavity near the valve body pressure ring for installing the valve body dividing ring. Step 4: Install the valve body dividing ring: The valve body dividing ring is made of a circular ring cut into three or more segments; Step 5: Assemble the three or more segments of the valve body dividing ring into the annular groove of the valve body cavity one by one. The three or more segments of the valve body dividing ring should fit tightly together to form a complete ring. Step 6: Move the valve body pressure ring back from right to left to the valve body dividing ring. At this time, the valve body pressure ring and the valve body dividing ring are tightly fitted and the valve body pressure ring is held in place by the valve body dividing ring, so the valve body pressure ring will not fall off. Step 7: The valve body pressure ring has pressure ring screw holes evenly opened upwards. Tighten the pressure ring screws to install them into each pressure ring screw hole. The pressure ring screws protrude from each pressure ring screw hole. At this time, the protruding part of the pressure ring screw presses against the valve body sealing ring. Step 8: Place the valve plate sealing ring and valve plate sealing ring gasket onto the annular valve plate step, and then cover it with the valve plate pressure ring; screw the screw into the valve plate pressure ring so that the pressure ring presses the valve plate sealing ring in place and prevents it from coming loose; Step 9: Rotate the integrated eccentric valve stem to gradually bring the valve plate sealing ring closer to the valve body sealing ring. By controlling the torque of the integrated eccentric valve stem, the sealing rings are made to fit together tightly enough.

10. A valve plate installation and debugging method according to claim 9, characterized in that: It also includes the step of rigidly fixing the integrated eccentric valve stem to the valve plate, including steps 10-12: Step 10: Drill pin holes: By rotating the integrated eccentric valve stem, the sealing surface is adjusted to a seamless sealing fit (i.e., a complete seal, which is the optimal position); Use a clamp to maintain the relative position between the integral eccentric valve stem and the valve plate, ensuring that the two do not move relative to each other; Use a drill bit to drill a hole from the back of the valve plate, with the center line of the hole tangent to the middle section of the integral eccentric valve stem; After drilling, cylindrical surfaces are formed on the middle section of the integral eccentric valve stem and on the valve plate; Step 11, drive in the pin: Drive a pin into the pre-drilled hole, ensuring the pin matches the hole's dimensions; The pin is in close contact with the middle section of the integrated eccentric valve stem and the cylindrical surface on the valve plate. At this time, the integrated eccentric valve stem and the valve plate are rigidly fixed and cannot rotate relative to each other. The driving torque borne by the integrated eccentric valve stem is transmitted to the valve plate through the squeezing action of the pin. Step 12, Weld the pins: Weld the end of the pin to fuse it with the valve plate, preventing the pin from falling off during the operation of the butterfly valve; at this time, the integrated eccentric valve stem, valve plate and pin form a stable rigid fixation.

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