Assembly method of large diameter triple eccentric butterfly valve

Abstract

The present invention provides a method for assembling a large-diameter triple-eccentric butterfly valve, comprising: placing a valve body on an assembly platform; hoisting a valve plate into the inner cavity of the valve body; installing bearings in the valve body, wherein the bearings are respectively installed in first mounting channels of a valve stem in the valve body; installing coaxial sleeves in the first mounting channels, respectively, using the bearings as guides, wherein one end of the coaxial sleeve passes through the first mounting channel and then extends into a second mounting channel in the valve plate for mounting the valve stem, so that the valve plate is supported within the valve body by the coaxial sleeves, and the valve plate and the valve body are fixedly connected; removing one of the coaxial sleeves, hoisting the valve stem and aligning it with the first mounting channel, so that the valve stem passes through the bearing, the second mounting channel, and the bearing in sequence, and the other coaxial sleeve is ejected, thereby completing the assembly of the valve stem. This solution can effectively improve the assembly efficiency of large-diameter triple-eccentric butterfly valves.

Description

Technical Field

[0001] The invention belongs to the technical field of butterfly valve assembly, and in particular relates to an assembly method of a large-diameter triple-eccentric butterfly valve. Background Art

[0002] With the gradual improvement of my country's industrialization level, the development of the petroleum, electric power, metallurgy, chemical industry and urban construction has accelerated, the volume of devices used in various fields has increased, and the demand for butterfly valve products has gradually developed towards larger diameters. In particular, the demand for large-diameter triple-eccentric butterfly valves in gas and sewage treatment is increasing day by day. However, due to the large diameter of large-diameter (referring to butterfly valves with a diameter greater than DN1600) triple-eccentric butterfly valves, as well as the large and heavy parts such as the valve body, valve plate, and valve stem, the conventional assembly method of only crane hoisting and manual observation and alignment can no longer efficiently complete the assembly of large-diameter butterfly valves. Summary of the Invention

[0003] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a large-diameter triple-eccentric butterfly valve assembly method to efficiently assemble the large-diameter triple-eccentric butterfly valve.

[0004] To achieve the above-mentioned and other related purposes, the present invention provides a method for assembling a large-diameter triple-eccentric butterfly valve, comprising:

[0005] Place the valve body on the assembly platform;

[0006] Lift the valve plate into the inner cavity of the valve body;

[0007] Bearings are installed in the valve body, and the bearings are respectively installed in the first installation channels of the valve stem in the valve body;

[0008] Using the bearings as guides, coaxial sleeves are installed in the first installation channels. One end of the coaxial sleeve passes through the first installation channel and then extends into the second installation channel in the valve plate for installing the valve stem, so that the valve plate is supported by the coaxial sleeve within the valve body, and the valve plate and the valve body are fixedly connected;

[0009] Take out one of the coaxial sleeves, lift the valve stem and align it with the first installation channel, make the valve stem pass through the bearing, the second installation channel and the bearing in sequence, push out the other coaxial sleeve, and complete the valve stem assembly.

[0010] Optionally, the valve plate and the valve body are fixedly connected, including:

[0011] Install the support bracket onto the valve body;

[0012] The connecting bolts are passed through the support frame and then threadedly connected to the valve plate.

[0013] Optionally, install the support bracket onto the valve body, including:

[0014] Align the positioning boss on the support frame, which is used for positioning with the flow channel on the valve body, with the flow channel of the valve body;

[0015] The positioning boss is extended into the flow channel of the valve body and fits in the flow channel gap until the support frame abuts against the surface of the valve body.

[0016] Optionally, passing the connecting bolts through the support frame and threading them to the valve plate includes:

[0017] The connecting bolt passes through the first threaded hole on the support frame, extends into the flow channel of the valve body, and is connected to the second threaded hole on the edge of the valve plate in the flow channel for connecting the butterfly valve pressure ring.

[0018] Optionally, place the valve body onto an assembly platform, including:

[0019] Use a crane to hoist the valve body horizontally onto the assembly platform, then remove the crane and move it to the placement position of the valve plate to hoist the valve plate.

[0020] Optionally, after the valve plate and the valve body are fixedly connected, the method further comprises:

[0021] Remove the crane used to lift the valve plate and move the crane to the lifting position of the valve stem to lift the valve stem.

[0022] Optionally, after completing the valve stem assembly, the method further includes:

[0023] Remove the connecting bolts from the valve plate and support bracket;

[0024] Remove the support bracket from the valve body;

[0025] Assemble the remaining components of the butterfly valve.

[0026] As described above, the large-diameter triple-eccentric butterfly valve assembly method of the present invention has the following beneficial effects:

[0027] In this solution, the bearing is installed before the coaxial sleeve to guide it during installation. The coaxial sleeve provides support for the valve plate and guides the valve stem during installation, resolving the difficulty of aligning the valve stem with the first installation channel as it enters the valve body and exits the valve plate. The valve plate is fixed to the valve body, preventing the valve plate from moving widely due to stress, which could affect assembly efficiency. This solution effectively improves assembly efficiency and reduces the difficulty of assembling large-diameter triple-eccentric butterfly valves. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the assembly state of a large-diameter triple-eccentric butterfly valve in an embodiment of the present invention.

[0029] Figure 2Schematic diagram of another assembly state of the large-diameter triple-eccentric butterfly valve in an embodiment of the present invention.

[0030] Figure 3 Schematic diagram of the assembled product of a large-diameter triple-eccentric butterfly valve in an embodiment of the present invention. DETAILED DESCRIPTION

[0031] The reference numerals in the drawings of the specification include: assembly platform 1, valve body 2, valve plate 3, bearing 4, coaxial sleeve 5, valve stem 6, first installation channel 7, second installation channel 8, sealing subassembly 9, end cover assembly 10, and packing assembly 11.

[0032] The following describes the implementation of the present invention through specific embodiments. People skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0033] The assembly state of the large diameter triple eccentric butterfly valve in this application is shown in the attached Figure 1 and attached Figure 2 As shown in the figure, the assembly drawing of the large diameter three-sided butterfly valve is shown in the attached figure. Figure 3 shown.

[0034] like Figure 1 and Figure 2 As shown, this embodiment provides a method for assembling a large-diameter triple-eccentric butterfly valve, which at least includes steps S100 to S500.

[0035] Step S100, placing the valve body 2 on the assembly platform 1;

[0036] Step S200, hoisting the valve plate 3 into the inner cavity of the valve body 2;

[0037] Step S300: Install bearings 4 in the valve body 2. The bearings 4 are respectively installed in the first installation channels 7 of the valve stem 6 in the valve body 2.

[0038] Step S400: Using the bearing 4 as a guide, install the coaxial sleeve 5 in the first installation channel 7. One end of the coaxial sleeve 5 passes through the first installation channel 7 and extends into the second installation channel 8 in the valve plate 3 for installing the valve stem 6. The valve plate 3 is supported by the coaxial sleeve 5 in the valve body 2, and the valve plate 3 and the valve body 2 are fixedly connected.

[0039] Step S500, take out one of the coaxial sleeves 5, hoist the valve stem 6 and align it with the first installation channel 7, make the valve stem 6 pass through the bearing 4, the second installation channel 8 and the bearing 4 in sequence, push out the other coaxial sleeve 5, and complete the assembly of the valve stem 6.

[0040] In this embodiment, the bearing 4 is installed before the coaxial sleeve 5 to guide the coaxial sleeve 5 during installation. The installation of the coaxial sleeve 5 supports the valve plate 3 and guides the installation of the valve stem 6, resolving the difficulty in aligning the valve stem 6 with the first installation passage 7 as it enters the valve body 2 and exits the valve plate 3. The valve plate 3 is fixed to the valve body 2, preventing the valve plate 3 from shaking over a large range due to stress, which could affect assembly efficiency. This solution can effectively improve assembly efficiency and reduce the difficulty of assembling large-diameter triple-eccentric butterfly valves.

[0041] In an exemplary embodiment, in step S400 , the process of fixing the valve plate 3 and the valve body 2 includes at least steps S410 and S420 .

[0042] Step S410, installing the support frame onto the valve body 2;

[0043] Step S420: Pass the connecting bolts through the support frame and then threadably connect them to the valve plate 3.

[0044] In this embodiment, the valve plate 3 and the valve body 2 are tightened and fixed by connecting bolts and a support frame, thereby preventing the valve plate 3 from shaking significantly when subjected to force.

[0045] Exemplarily, the contact surface between the support frame and the valve body 2 is disc-shaped and matches the shape of the valve body 2 .

[0046] In an exemplary embodiment, in step S410 , the process of installing the support bracket onto the valve body 2 includes at least step S411 and step S412 .

[0047] Step S411, aligning the positioning boss on the support frame for positioning with the flow channel on the valve body 2 with the flow channel of the valve body 2;

[0048] In step S412 , the positioning boss is extended into the flow channel of the valve body 2 and is fitted with the flow channel gap until the support frame abuts against the surface of the valve body 2 .

[0049] It should be noted that the support frame is provided with a positioning boss for extending into the flow channel of the valve body 2. The setting of the positioning boss realizes the positioning between the support frame and the valve body 2, making it easier for the connecting bolts to align with the threaded holes on the valve plate 3.

[0050] In an exemplary embodiment, in step S420, the process of passing the connecting bolts through the support frame and threading them to the valve plate 3 includes at least:

[0051] The connecting bolt passes through the first threaded hole on the support frame, extends into the flow channel of the valve body 2, and is connected to the second threaded hole on the edge of the valve plate 3 in the flow channel for connecting the butterfly valve pressure ring.

[0052] In this embodiment, there is no need to open another threaded hole on the valve plate 3. Instead, the second threaded hole connecting the valve plate 3 and the pressure ring is used as the threaded hole connecting the valve plate 3 and the support frame.

[0053] In an exemplary embodiment, at step S100, the process of placing the valve body 2 on the assembly platform 1 includes:

[0054] The valve body 2 is hoisted horizontally onto the assembly platform 1 by a crane, and then the crane is withdrawn to move to the placement position of the valve plate 3 to hoist the valve plate 3.

[0055] It is worth noting that since the valve plate 3, valve stem 6, and valve body 2 in the large-diameter triple-eccentric butterfly valve are heavier than other components, their assembly is difficult. The assembly of the valve plate 3, valve stem 6, and valve body 2 of the existing triple-eccentric butterfly valve requires the use of two cranes. After the valve body 2 is placed on the assembly platform 1, one crane is required to lift the valve plate 3, and the other crane is required to lift the valve stem 6. Then, the assembly of the valve plate 3 and valve body 2 is visually achieved, and then the assembly of the valve stem 6 with the valve plate 3 and valve body 2 is visually achieved. In this embodiment, since the coaxial sleeve 5 supports the valve plate 3 and the support frame fixes the valve body 2 and the valve plate 3, the crane that lifts the valve plate 3 can be withdrawn after the position of the valve plate 3 is determined, and the valve stem 6 can be lifted.

[0056] In an exemplary embodiment, after the valve plate 3 and the valve body 2 are fixedly connected in step S400, the method further comprises:

[0057] Remove the crane used to hoist the valve plate 3 and move the crane to the hoisting position of the valve stem 6 to hoist the valve stem 6.

[0058] In this embodiment, the valve plate 3 and the valve stem 6 are hoisted by the same crane, which reduces the cost.

[0059] In an exemplary embodiment, after completing the assembly of the valve stem 6 in step S500 , the method further includes steps S510 to S530 .

[0060] Step S510, removing the connecting bolts from the valve plate 3 and the support frame;

[0061] Step S520, removing the support frame from the valve body 2;

[0062] Step S530: assemble the remaining components of the butterfly valve.

[0063] It should be noted that, since the connecting bolts occupy the second threaded holes of the valve plate 3 and the pressure ring, the support frame and the connecting bolts need to be removed before subsequent assembly.

[0064] like Figure 3As shown, it should also be noted that after the support frame and connecting bolts are removed, the end cover assembly 10 is installed. The end cover assembly 10 includes a winding gasket, an end cover, etc., and then the packing assembly 11 between the valve stem 6 and the valve body 2 and the sealing subassembly 9 between the valve plate 3 and the valve body 2 are installed in sequence.

[0065] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A large diameter triple eccentric butterfly valve assembly method, characterized in that: include: Place the valve body on the assembly platform; Lift the valve plate into the inner cavity of the valve body; Bearings are installed in the valve body, and the bearings are respectively installed in the first installation channels of the valve stem in the valve body; Using the bearings as guides, coaxial sleeves are installed in the first installation channels. One end of the coaxial sleeve passes through the first installation channel and then extends into the second installation channel in the valve plate for installing the valve stem, so that the valve plate is supported by the coaxial sleeve within the valve body, and the valve plate and the valve body are fixedly connected; Take out one of the coaxial sleeves, lift the valve stem and align it with the first installation channel, make the valve stem pass through the bearing, the second installation channel and the bearing in sequence, push out the other coaxial sleeve, and complete the valve stem assembly.

2. The assembly method of a large diameter triple eccentric butterfly valve according to claim 1, characterized in that: The valve plate and the valve body are fixedly connected, including: Install the support bracket onto the valve body; The connecting bolts are passed through the support frame and then threadedly connected to the valve plate.

3. The assembly method of a large diameter triple eccentric butterfly valve according to claim 2, characterized in that: Install the support bracket onto the valve body, including: Align the positioning boss on the support frame, which is used for positioning with the flow channel on the valve body, with the flow channel of the valve body; The positioning boss is extended into the flow channel of the valve body and fits in the flow channel gap until the support frame abuts against the surface of the valve body.

4. The assembly method of a large diameter triple eccentric butterfly valve according to claim 2, characterized in that: The connecting bolts are passed through the support frame and then threadedly connected to the valve plate, including: The connecting bolt passes through the first threaded hole on the support frame, extends into the flow channel of the valve body, and is connected to the second threaded hole on the edge of the valve plate in the flow channel for connecting the butterfly valve pressure ring.

5. The assembly method of a large diameter triple eccentric butterfly valve according to claim 1, characterized in that: Place the valve body onto the assembly platform, including: Use a crane to hoist the valve body horizontally onto the assembly platform, then remove the crane and move it to the placement position of the valve plate to hoist the valve plate.

6. The assembly method of a large diameter triple eccentric butterfly valve according to claim 1, characterized in that: After the valve plate and the valve body are fixedly connected, the method further comprises: Remove the crane used to lift the valve plate and move the crane to the lifting position of the valve stem to lift the valve stem.

7. The assembly method of a large diameter triple eccentric butterfly valve according to claim 2, characterized in that: After the valve stem is assembled, the method further comprises: Remove the connecting bolts from the valve plate and support bracket; Remove the support bracket from the valve body; Assemble the remaining components of the butterfly valve.

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