Adapting processing method for butterfly valve stem replacement

Abstract

The application discloses a kind of butterfly valve stem replacement time's adaptive machining method, it is characterized in that, step includes: measuring original locating pin hole size, measuring original valve stem size, making new valve stem, making hollow welding conical pin, hollow welding conical pin replaces original locating pin, processes new pin hole and processes new locating pin.A kind of butterfly valve stem replacement time's adaptive machining method, using the method of replacing valve stem extends butterfly valve service life.Butterfly valve stem structure is simple, and the cost of manufacturing new valve stem is low, thereby reducing the maintenance cost of butterfly valve.In processing, hollow welding conical pin is used to replace original locating pin, and the locating pin hole of valve stem is reprocessed, so that the processing size and precision of valve stem are completely controllable.The method arranges process reasonably, is suitable for the maintenance of cargo oil pipe butterfly valve, improves the efficiency of butterfly valve maintenance.

Description

Technical Field

[0001] This invention belongs to the field of mechanical manufacturing and maintenance technology, and specifically relates to an adaptation processing method for replacing the valve stem of a butterfly valve. Background Technology

[0002] The valve stem is not only a moving and load-bearing component during valve opening and closing, but also a sealing component. Simultaneously, it is subjected to the impact and corrosion of the medium and friction with the packing; therefore, the valve stem is a vulnerable part. During the repair of cargo oil pipeline butterfly valves, due to severe valve stem corrosion, a large number of butterfly valve stems needed to be replaced.

[0003] Disassembly and inspection revealed that the butterfly valves currently in operation are of different specifications, with variations in the position, angle, and size of the locating holes on the valve stems. This poses a significant challenge to replacing the valve stems, making precise measurement and machining impossible. This could potentially transform the valve stem replacement project into a complete replacement of the entire butterfly valve. To save on replacement costs, a method for machining valve stems to quickly replace the original butterfly valve stems is urgently needed. Summary of the Invention

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A method for adapting and machining a butterfly valve stem during replacement, comprising the following steps:

[0006] Measure the original positioning pin hole size: Remove one positioning pin between the valve stem and the valve plate of the butterfly valve, measure the size of the positioning pin hole, record the measurement, reinstall the positioning pin and tighten it, remove another positioning pin and measure its positioning pin hole, until all the positioning pin holes on the original valve stem have been measured and recorded.

[0007] Measure the original valve stem dimensions: Disassemble the butterfly valve and measure the dimensions of each part of the original valve stem, avoiding corroded areas during measurement;

[0008] To manufacture a new valve stem: Machine a new valve stem according to the measured dimensions of the original valve stem, leaving the locating pin hole unmachined;

[0009] Manufacturing hollow welded tapered pins: The diameter and taper of the large and small ends of the hollow welded tapered pins are consistent with the original positioning pin holes, and the middle part matches the shape of the original valve stem. It is machined into a saddle shape, and a certain gap is left between the hollow welded tapered pins and the new valve stem.

[0010] Replace the original locating pin with a hollow welded conical pin: Assemble the new valve stem with the various components of the butterfly valve. If the butterfly valve has two original locating pins, assemble and install one hollow welded conical pin. If the butterfly valve has three to four original locating pins, assemble and install two hollow welded conical pins. After assembly, rotate the valve head to the fully open position and lock it.

[0011] Machining new pin holes: Use the clamps of the boring machine to fix the valve plate, weld the hollow welded tapered pin to the new valve stem and fix it, remove the clamps fixing the valve plate, and use half of the old hole on the valve plate as the calibration basis to bore the new valve stem.

[0012] Machining new locating pins: Make new locating pins according to the dimensions of the newly machined locating pin holes; after the locating pins meet the fit requirements, install and tighten them; the hollow welded tapered pins are removed during the boring process and replaced by new locating pins.

[0013] Furthermore, measuring the original positioning pin hole size includes, since the original positioning pin hole is a tapered hole, measuring the diameter of the large and small ends of the original positioning pin hole and the length of the hole respectively. After measuring the data of the positioning pin hole, measuring the taper of the original positioning pin is used for calibration.

[0014] Furthermore, the dimensions of the various parts of the original valve stem being measured include, but are not limited to, the valve stem outer diameter, length, and keyway dimensions.

[0015] Furthermore, the measurement of the dimensions of each part of the original valve stem is used as a reference to measure the dimensions of each component that mates with the valve stem.

[0016] Furthermore, the material used to manufacture the hollow welded tapered pin is the same as that used for the valve stem.

[0017] Furthermore, the processing of the new locating pin hole also includes, after completing the boring of a locating pin hole, precision reaming is performed using a tapered reamer; the taper of the reamer is consistent with that of the old locating pin hole, and the size of the new locating pin hole after reaming needs to be larger than that of the original locating pin hole.

[0018] Furthermore, the steps also include: after machining the new locating pin, lifting the butterfly valve off the boring machine and conducting a performance test.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] A method for adapting the valve stem during butterfly valve replacement is disclosed, extending the service life of the butterfly valve by replacing the valve stem. The butterfly valve stem has a simple structure, and manufacturing a new stem is inexpensive, thus reducing maintenance costs. During processing, a hollow welded tapered pin replaces the original locating pin, and the locating pin hole in the valve stem is then machined, ensuring complete control over the valve stem's dimensions and precision. This method features a rationally arranged process and is suitable for the maintenance of cargo oil pipe butterfly valves, improving the efficiency of butterfly valve maintenance. Attached Figure Description

[0021] Figure 1 This is a flowchart illustrating the adaptation processing method for replacing the valve stem of a butterfly valve according to the present invention.

[0022] Figure 2 This is a schematic diagram of the valve stem structure of an adaptation processing method for replacing the valve stem of a butterfly valve according to the present invention.

[0023] Figure 3 This is a schematic diagram of the original positioning pin structure for an adaptation processing method for replacing the valve stem of a butterfly valve according to the present invention.

[0024] Figure 4 This is a schematic diagram of the valve stem structure of a butterfly valve according to the present invention, which describes an adaptation processing method for replacing the valve stem.

[0025] Figure 5 This is a schematic diagram of the other side of the valve plate in the adaptation processing method for replacing the valve stem of a butterfly valve according to the present invention.

[0026] Figure 6 This is a schematic diagram of the valve stem assembly structure of an adaptation processing method for replacing the valve stem of a butterfly valve according to the present invention.

[0027] Figure 7 This is a schematic diagram of the assembly structure on the other side of the valve stem in the adaptation processing method for replacing the valve stem of a butterfly valve according to the present invention.

[0028] Figure 8 A schematic diagram of the hollow welded tapered pin structure of an adaptation processing method for replacing the valve stem of a butterfly valve according to the present invention;

[0029] Figure 9 This is a schematic diagram of the hollow welded tapered pin assembly structure for an adaptation processing method when replacing the valve stem of a butterfly valve according to the present invention.

[0030] Figure 10 This invention provides a method for adapting the valve stem during replacement, and includes a schematic diagram of the valve stem being machined on a boring machine.

[0031] In the figure, 1-valve stem, 2-original locating pin, 3-valve flap, 4-hollow welded conical pin, 5-valve body, 6-boring machine, 7-new locating pin. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. It should be understood that this application is not limited to the exemplary embodiments disclosed herein. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0033] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", 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. Therefore, they should not be construed as limitations on this invention.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0035] In the embodiments of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0036] To achieve the above objectives, the present invention adopts the following technical solution:

[0037] like Figure 1 As shown, a method for adapting and machining a butterfly valve stem during replacement includes the following steps:

[0038] S1 measures the dimensions of the two holes of the original locating pin: (e.g.) Figure 1-7 As shown. Remove one locating pin between the valve stem 1 and the valve plate 3 of the butterfly valve, measure the size of the locating pin hole, record the measurement, reinstall the locating pin and tighten it, remove the other locating pin and measure its locating pin hole, until all the locating pin holes on the original valve stem have been measured and recorded.

[0039] Specifically, the locating pin hole is a tapered hole that passes laterally through the valve stem 1 and the valve plate 3. This hole is half on each of the valve plate 3 and valve stem 1. The diameter and length of the original locating pin 2 hole are measured at both ends. After measuring the locating pin hole data, the taper of the original locating pin 2 is measured for calibration. Generally, there are 2-4 locating pin holes, and all need to be measured. The dimensions of the new locating pin and the locating pin hole of the new valve stem are then referenced to the measured data.

[0040] S2 Measure the original valve stem 1 dimensions: Disassemble the butterfly valve and measure the dimensions of each part of the original valve stem 1, avoiding corroded areas during measurement.

[0041] Specifically, the corrosion area alters the original valve stem's shape, and its dimensions are not relevant for reference. The dimensions of all components mating with valve stem 1 can be measured for reference, including but not limited to the valve stem's outer diameter, length, and keyway dimensions. Since the orientation, position, and size of the locating pin holes on valve stem 1 are random and cannot be precisely measured, they will not be addressed here.

[0042] S3: Make a new valve stem 1: Machine a new valve stem 1 according to the measured dimensions of the original valve stem 1, without machining the locating pin hole.

[0043] Specifically, the material bar used to make the new valve stem 1 is machined according to the above measurement data. The outer diameter, length, keyway, and other dimensions are machined. In this step, the outer shape of the new valve stem is machined first, and the locating pin hole is not machined. Later, a hollow welded tapered pin 4 is used to replace the original locating pin for positioning, and then the pin hole of the new valve stem is machined.

[0044] S4 manufactures hollow welded tapered pins 4: such as Figure 8 As shown, the diameter and taper of the large and small ends of the hollow welded tapered pin 4 are consistent with the original positioning pin hole, and the middle part matches the shape of the original valve stem. It is machined into a saddle shape, and a certain gap is left between the hollow welded tapered pin 4 and the new valve stem to facilitate subsequent processing.

[0045] Specifically, the material used to make the hollow welded tapered pin is the same as that used for the valve stem.

[0046] S5 hollow welded tapered pin 4 replaces the original locating pin: (e.g.) Figure 9 As shown, assemble the new valve stem 1 with the various components of the butterfly valve. If the butterfly valve has 2 original positioning pins, assemble and install 1 hollow welded conical pin 4. If the butterfly valve has 3-4 original positioning pins, assemble and install 2 hollow welded conical pins 4. After assembly, rotate the valve head to the fully open position and lock it.

[0047] Specifically, after all components are installed, rotate the valve head to the fully open position and lock it. If it is a hydraulic valve head, it can be locked hydraulically. If it is a handwheel valve head, some simple clamps need to be made to fix the handwheel in place so that it cannot be rotated.

[0048] S6 machining of new pin holes: such as Figure 10 As shown, the valve plate 3 is fixed by the fixture of the boring machine 6, the hollow welded tapered pin 4 is welded and fixed to the new valve stem 1, the fixture fixing the valve plate 3 is removed, and the new valve stem 1 is bored using half of the old hole on the valve plate 3 as the calibration basis.

[0049] Specifically, the butterfly valve is hoisted onto the horizontal milling machine, laid flat, and the valve body 5 is fixed. The position of the valve lever 3 is adjusted to be in the fully open state, and the valve lever 3 is fixed in place using the fixture of the boring machine 6. If the boring machine 6 does not have a suitable fixture, a simple fixture can be made to fix the valve lever 3 on the T-slot machining platform of the boring machine 6. Welding is performed at the inner hole of the hollow welded tapered pin 4 to connect and fix the tapered pin to the valve stem 1. The fixture fixing the valve lever 3 is removed to avoid obstructing subsequent machining operations on the boring machine 6. The position and angle of the positioning pin hole to be machined are adjusted to facilitate subsequent machining.

[0050] Specifically, using half of the old hole on valve lever 3 as the calibration base, the valve stem 1 is bored. After boring one locating pin hole, a tapered reamer is used for precision reaming. The taper of the reamer is consistent with that of the old locating pin hole. The finished size of the reamed hole needs to be slightly larger than the old hole in order to form a more complete tapered inner hole.

[0051] S7 machining of new locating pin 7: Make new locating pin 7 according to the newly machined locating pin hole size; after the locating pin meets the fit, install and tighten it. The hollow welded tapered pin 4 is removed during the boring process and replaced by the new locating pin 7.

[0052] S8 Performance Test: After machining the new locating pin 7, the butterfly valve is lifted off the boring machine 6 for a performance test. The butterfly valve is then subjected to a complete test after the valve stem 1 is replaced to verify its quality.

[0053] A method for adapting the valve stem during butterfly valve replacement is disclosed, extending the service life of the butterfly valve by replacing the valve stem. The butterfly valve stem has a simple structure, and manufacturing a new stem is inexpensive, thus reducing maintenance costs. During processing, a hollow welded tapered pin replaces the original locating pin, and the locating pin hole in the valve stem is then machined, ensuring complete control over the valve stem's dimensions and precision. This method features a rationally arranged process and is suitable for the maintenance of cargo oil pipe butterfly valves, improving the efficiency of butterfly valve maintenance.

[0054] It should also be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0055] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for adapting and processing a butterfly valve stem during replacement, characterized in that the steps include: include: Measure the original locating pin hole size: The locating pin hole is a tapered hole that passes horizontally through the valve stem and valve plate. The locating pin hole is half on the valve plate and half on the valve stem. Remove one locating pin between the valve stem and valve plate of the butterfly valve, measure the size of the locating pin hole at the location where the locating pin is removed, record the measurement, reinstall the locating pin in the locating pin hole and tighten it, remove another locating pin and measure the locating pin hole at the location where the locating pin is removed, until all the locating pin holes on the original valve stem have been measured and recorded. Measure the original valve stem dimensions: Disassemble the butterfly valve and measure the dimensions of each part of the original valve stem, avoiding corroded areas during measurement; To manufacture a new valve stem: Machine a new valve stem according to the measured dimensions of the original valve stem, leaving the locating pin hole unmachined; Manufacturing hollow welded tapered pins: The diameter and taper of the large and small ends of the hollow welded tapered pins are consistent with the original positioning pin holes, and the middle part matches the shape of the original valve stem. They are machined into a saddle shape, and a certain gap is left between the hollow welded tapered pins and the new valve stem. Replace the original locating pin with a hollow welded conical pin: Assemble the new valve stem with the various components of the butterfly valve. If the butterfly valve has two original locating pins, assemble and install one hollow welded conical pin. If the butterfly valve has three to four original locating pins, assemble and install two hollow welded conical pins. After assembly, rotate the valve head to the fully open position and lock it. Machining new positioning pin holes: Use the clamps of the boring machine to fix the valve plate, weld the hollow welded tapered pin to the new valve stem and fix it, remove the clamps fixing the valve plate, and use half of the old hole on the valve plate as the calibration basis to perform boring operation on the new valve stem; Machining new locating pins: Make new locating pins according to the dimensions of the newly machined locating pin holes; after the locating pins meet the fit requirements, install and tighten them; the hollow welded tapered pins are removed during the boring process and replaced by new locating pins.

2. The adaptation processing method for replacing the butterfly valve stem according to claim 1, characterized in that, Measuring the original locating pin hole dimensions includes: measuring the diameter and length of the large and small ends of the original locating pin hole respectively; after measuring the data of the locating pin hole, measuring the taper of the original locating pin for calibration.

3. The adaptation processing method for replacing the butterfly valve stem according to claim 2, characterized in that, The dimensions of various parts of the original valve stem are measured, including but not limited to the valve stem outer diameter, length, and keyway dimensions.

4. The adaptation processing method for replacing the butterfly valve stem according to claim 3, characterized in that, The dimensions of each part of the original valve stem are measured for reference when measuring the dimensions of the components that mate with the valve stem.

5. The adaptation processing method for replacing the butterfly valve stem according to claim 1, characterized in that, The material used to manufacture the hollow welded tapered pin is the same as that used for the valve stem.

6. The adaptation processing method for replacing the butterfly valve stem according to claim 1, characterized in that, The process of machining new positioning pin holes also includes: after completing the boring of a positioning pin hole, precision reaming is performed using a tapered reamer; the taper of the reamer is consistent with that of the old positioning pin hole, and the size of the new positioning pin hole after reaming needs to be larger than that of the original positioning pin hole.

7. The adaptation processing method for replacing the butterfly valve stem according to claim 1, characterized in that, The steps also include: after machining the new locating pin, lifting the butterfly valve off the boring machine and conducting a performance test.

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