TWI774273B - Method and device for manufacturing ultraviolet light tube - Google Patents

Abstract

A method for manufacturing ultraviolet light tube is described. In this method, a first end portion of a tube body is connected to a first port of a vacuum switch valve device. A second port of the vacuum switch valve device communicates with a vacuum pump or a gas supply source. The vacuum switch valve device is configured to open or close the communication between the tube body and the vacuum pump or the gas supply source. A first electrode is put into a second end portion of the tube body. A first vacuum operation is performed on the tube body via the vacuum switch valve device. The first electrode and the second end portion are welded. A first inert gas is injected into the tube body. Mercury, a metal halide, and a second electrode are put into the tube body. A second vacuum operation is performed on the tube body via the vacuum switch valve device. A second inert gas is injected into the tube body. The vacuum switch valve device is closed. The second electrode and the first end portion are welded.

Description

Method and device for manufacturing ultraviolet lamp

The present disclosure relates to a manufacturing technology of a lamp tube, and more particularly, to a method and apparatus for manufacturing an ultraviolet lamp tube.

Generally, when making an ultraviolet lamp, when gas, mercury, metal halide, and vacuum are sealed into the lamp, a channel is required to communicate with the lamp, so as to introduce the gas, mercury, and metal halide into the lamp and communicate with the lamp. Vacuum the lamp. Therefore, a side tube is provided in the middle of the tube body of the lamp tube or at a position close to one end of the lamp tube. Introduce gas, mercury, and metal halide into the lamp tube, and after maintaining a certain vacuum in the lamp tube, seal the opening on the side wall of the lamp tube, and fuse the side tube.

In this manufacturing method, the electrodes at both ends need to be put in first, then the inside of the lamp tube is evacuated from the side tube, then the two ends of the lamp tube are fused and sealed, and then part of the side tube is fused and sealed. Next, the two-terminal quartz and the two-terminal electrode are melted so that the two-terminal and the quartz are tightly fused together. Next, a part of the side pipe was cut off to open the side pipe, and a pipe containing metal halide and mercury was attached to the side pipe. After the inside of the lamp tube is evacuated by the barrel tube and the side tube, the argon Gas is poured into the lamp tube, and the tube is sealed. Then, metal halide and mercury are introduced into the inside of the lamp tube, the side tube is fused, and the tube wall of the lamp tube is sealed at the same time.

Therefore, such a production method is too complicated. In addition, the side pipe needs to be airtight after gas, mercury, and metal halide is enclosed and vacuumed, and internal stress is generated in the pipe body when the pipe body is sintered and fused. Although the oxyhydrogen flame can be used to remove the stress of the pipe body afterwards, the removal effect is not 100%. Moreover, the staff needs to remove the stress of the tube body first, and then use the stress observation table to check. This procedure needs to be repeated many times to remove the stress of the tube body by more than 95%, resulting in a substantial increase in labor costs.

In addition, after the opening of the side wall is sealed, a deformed and uneven area is generated at the sealing part of the tube body of the lamp tube. The arc generated when the UV lamp is turned on will be deformed when it passes through this deformed uneven area. As a result, the refraction of light penetrating this uneven area is larger than that of penetrating the wall of a normal curved surface when the light is turned on, resulting in a lack of concentration of illumination.

Furthermore, when the lamp tube is cooled, if the tube side where the uneven area of the lamp tube is located faces downward, mercury and halides, etc. will be deposited on the uneven area due to gravity. Long-term precipitation of mercury and halides, etc., will produce blackening in this uneven area and deposit deep into the wrinkle points of the uneven area. As a result, the parameters of the lamp tube will be slightly changed, so that the photoelectric characteristics of the lamp tube have a large error range.

Therefore, an object of the present disclosure is to provide a method for manufacturing an ultraviolet lamp tube, which is to remove mercury, mercury, and mercury from one end of the tube body of the ultraviolet lamp The metal halide and the inert gas are introduced into the tube body, and the tube body is evacuated from this end of the tube body. In this way, the tube wall of the tube body is flat, which can improve the uniformity of the illuminance of the ultraviolet lamp tube, and can avoid the parameters of the lamp tube from being affected by the sediment. In addition, since the tube wall of the tube body is flat, the convenience of installation and use of the lamp tube can be improved.

Another object of the present disclosure is to provide a method for manufacturing an ultraviolet lamp tube, which has no side tube on the tube body, thus saving labor for manufacturing the side tube, removing the side tube, and stress relief and inspection after the side tube is removed. and time, and can reduce production costs.

Another object of the present disclosure is to provide a manufacturing apparatus for an ultraviolet lamp tube, which includes a vacuum switch valve device that can communicate with a vacuum pump and one end of the tube body, so that mercury, metal halide, with inert gas, and evacuated. Thereby, the manufacturing process can be simplified and the production capacity can be increased. In addition, the vacuum switch valve device can be reused. Compared with the conventional use of two side pipes which cannot be recycled and reused at one time, the present disclosure can greatly save costs and avoid waste of resources.

According to the above objective of the present disclosure, a method for manufacturing an ultraviolet lamp is provided. In this method, the first end of the pipe body is communicated with the first interface of the vacuum switching valve device. The second interface of the vacuum switch valve device is communicated with a vacuum pump or a gas supply source. The vacuum switch valve device is configured to open or close communication between the tubing and the vacuum pump or gas supply. The first electrode is placed in the second end of the tube body. The first vacuum operation is performed on the pipe body through the vacuum switch valve device. The first electrode and the second end are welded. The first inert gas is injected into the tube body. The mercury, metal halide, and second electrode are placed into the body of the tube. The second vacuuming operation is performed on the pipe body through the vacuum switching valve device. The second inert gas is injected into the pipe body. Close the vacuum switch valve assembly. The second electrode and the first end are welded.

According to an embodiment of the present disclosure, the sealing of the second end portion includes fusing a portion of the second end portion.

According to an embodiment of the present disclosure, the first vacuuming operation and the second vacuuming operation each include opening the vacuum switch valve device to connect the tube body with the vacuum pump; and using the vacuum pump to vacuum the tube body.

According to an embodiment of the present disclosure, the first inert gas and the second inert gas are the same inert gas. The injection of the first inert gas and the injection of the second inert gas each include: opening the vacuum switch valve device to make the pipe body communicate with the gas supply source; and injecting the inert gas into the pipe body using the gas supply source.

According to an embodiment of the present disclosure, the first inert gas and the second inert gas are argon or xenon.

According to an embodiment of the present disclosure, the above-mentioned injecting the first inert gas includes making the pipe body in a positive pressure state, and injecting the second inert gas includes making the pipe body under a negative pressure state.

According to an embodiment of the present disclosure, the welding of the first electrode and the second end and the welding of the second electrode and the first end each include: rotating the tube body; and performing a melting process when the tube body is rotated.

According to an embodiment of the present disclosure, after welding the second electrode and the first end, the above-mentioned method further includes removing the tube body from the vacuum switching valve device.

In accordance with the above-mentioned purpose of the present disclosure, a method of making an ultraviolet lamp tube is provided. A manufacturing device includes a needle valve, a first connecting pipe, a second connecting pipe, a first quick connector, and a second quick connector. The needle valve has a first end and a second end opposite to each other. The first connecting pipe has a first end and a second end opposite to each other. The first end of the first connecting pipe is engaged with the first end of the needle valve. The second connecting pipe has a first end and a second end opposite to each other. The first end of the second connecting pipe is engaged with the second end of the needle valve. The first quick connector has a first end and a second end opposite to each other. The first end of the first quick connector is engaged with the second end of the first connecting pipe. The second end of the first quick connector is configured to be engaged with the first end of the tube body of the ultraviolet lamp tube. The second quick connector has a first end and a second end opposite to each other. The first end of the second quick connector is engaged with the second end of the second connecting pipe. The second end of the second quick connector is configured to communicate with a vacuum pump or a gas supply. The needle valve is configured to control the communication between the tube body and the vacuum pump or gas supply.

According to an embodiment of the present disclosure, the first connecting pipe and the second connecting pipe are stainless steel pipes.

100: Steps

110: Steps

120: Steps

130: Steps

140: Steps

150: Steps

160: Steps

170: Steps

180: Steps

190: Steps

200: Steps

300: Manufacturing equipment for UV lamps

310: Needle valve

312: First End

314: Second End

316: Subject

318: switch

320: The first connecting pipe

322: First End

324: Second End

330: Second connecting pipe

332: First End

334: Second End

340: The first quick connector

342: First End

344: Second End

350: Second quick connector

352: First End

354: Second End

360: Vacuum Pump/Gas Supply Source

370: Pipeline

380: Quick Connector

400: UV lamp tube

410: Tube body

412: First End

414: Second End

In order to make the above and other objects, features, advantages and embodiments of the present disclosure more clearly understood, the accompanying drawings are described as follows: [FIG. 1] is a diagram illustrating an ultraviolet lamp according to an embodiment of the present disclosure. A flowchart of a manufacturing method; [ FIG. 2 ] is a schematic diagram of a manufacturing apparatus for an ultraviolet lamp tube according to an embodiment of the present disclosure; and [ FIG. 3 ] is a schematic diagram illustrating the manufacture of an ultraviolet lamp tube according to an embodiment of the present disclosure Schematic diagram of the device.

Please refer to FIG. 1 to FIG. 3 , which are respectively a flowchart of a method for manufacturing an ultraviolet lamp according to an embodiment of the present disclosure, a schematic diagram of an apparatus for manufacturing an ultraviolet lamp according to an embodiment of the present disclosure, And a schematic diagram of an apparatus for manufacturing an ultraviolet lamp according to an embodiment of the present disclosure. In this embodiment, the manufacturing apparatus 300 of the ultraviolet lamp as shown in FIG. 2 can be used when manufacturing the ultraviolet lamp.

In some examples, the manufacturing apparatus 300 of the UV lamp includes a vacuum switching valve apparatus. Referring first to FIG. 2 , the UV lamp manufacturing apparatus 300 may mainly include a needle valve 310 , a first connecting tube 320 , a second connecting tube 330 , a first quick connector 340 , and a second quick connector 350 . The needle valve 310 has a first end 312 and a second end 314 opposite to each other. In some demonstrative examples, needle valve 310 may include body 316 and switch 318 . A channel (not shown) is provided in the main body 316 . The first end 312 and the second end 314 of the needle valve 310 are located on the main body 316 . The switch 318 passes through the main body 316 and protrudes from one side of the main body 316 . The switch 318 is configured to open or close the channel within the body 316 . The material of the main body 316 can be metal, such as stainless steel. The switch 318 can be made of metal or plastic.

The first connecting pipe 320 has a first end 322 and a second end 324 , wherein the first end 322 and the second end 324 are located on opposite sides of the first connecting pipe 320 respectively. The first end 322 of the first connecting pipe 320 is engaged with the first end 312 of the needle valve 310 . The material of the first connecting pipe 320 may be metal. lift For example, the first connecting pipe 320 can be a stainless steel pipe.

Similarly, the second connecting pipe 330 also has a first end 332 and a second end 334 opposite to each other. The first end 332 of the second connecting tube 330 is engaged with the second end 314 of the needle valve 310 . The material of the second connecting pipe 330 may be metal. For example, the second connecting pipe 330 may be a stainless steel pipe.

The first quick connector 340 has a first end 342 and a second end 344 opposite to each other. The first end 342 of the first quick connector 340 is engaged with the second end 324 of the first connecting pipe 320 . That is, the first connecting pipe 320 is used for connecting the first quick connector 340 and the first end 312 of the needle valve 310 . The second end 344 of the first quick connector 340 can be used as the first interface of the vacuum switch valve device of the UV lamp manufacturing apparatus 300 . Please also refer to FIG. 3 , the second end 344 of the first quick connector 340 can be engaged with the first end 412 of the tube body 410 of the UV lamp 400 . Using the first quick connector 340 , the first end 412 of the tube body 410 of the ultraviolet lamp tube 400 can be quickly and easily installed on the ultraviolet lamp tube manufacturing apparatus 300 . The material of the first quick connector 340 can be metal, such as stainless steel.

Similarly, the second quick connector 350 also has a first end 352 and a second end 354 opposite to each other. The first end 352 of the second quick connector 350 is engaged with the second end 334 of the second connecting pipe 330 . That is, the second connecting pipe 330 is used for connecting the second quick connector 350 and the second end 314 of the needle valve 310 . The second end 354 of the second quick connector 350 can be used as the second interface of the vacuum switch valve device of the UV lamp manufacturing apparatus 300 . As shown in FIG. 3 , the second end 354 of the second quick connector 350 can be engaged with a vacuum pump/gas supply 360 . With the second quick connector 350, quick and easy The manufacturing apparatus 300 of the ultraviolet lamp tube is connected with the vacuum pump/gas supply source 360 . The needle valve 310 can be used to control the communication between the tube body 410 of the UV lamp 400 and the vacuum pump/gas supply source 360 .

In some exemplary examples, as shown in FIG. 3 , a pipeline 370 and another quick connector 380 can be used to connect the UV lamp manufacturing apparatus 300 and the vacuum pump/gas supply source 360 . The pipeline 370 is connected between the second quick connector 350 and the quick connector 380 . The material of the second quick connector 350 and the quick connector 380 can be metal, such as stainless steel. The material of the pipeline 370 can also be metal, such as stainless steel.

Please refer to FIG. 1 and FIG. 3 at the same time. In some examples, when manufacturing the UV lamp 400 , step 100 may be performed first to provide the tube body 410 of the UV lamp 400 , and the tube body 410 is disposed on the first quick connector 340 in the second end 344. Thereby, the tube body 410 of the ultraviolet lamp 400 can be connected to the second end 344 of the first quick connector 340 of the ultraviolet lamp manufacturing apparatus 300 , that is, the first interface of the vacuum switch valve device.

In some examples, the tube body 410 of the UV lamp 400 is a straight tubular structure. The pipe body 410 may include a first end portion 412 and a second end portion 414 , wherein the first end portion 412 and the second end portion 414 are respectively located on opposite sides of the pipe body 410 . When the tube body 410 is set in the second end 344 of the first quick connector 340, the first end 412 of the tube body 410 is passed through the second end 344 of the first quick connector 340, so as to communicate with the first The end portion 412 is connected to the first interface of the vacuum switching valve device. The first end 412 of the pipe body 410 is tightly connected with the second end 344 of the first quick connector 340, so as to prevent the fluid flowing through the joint of the two from leaking out or the external fluid from entering from the joint of the two. enter.

The second end 354 of the second quick connector 350 of the UV lamp manufacturing apparatus 300 , that is, the second interface of the vacuum switch device, can communicate with the vacuum pump/gas supply source 360 . For example, the second interface of the vacuum switching device can be connected to the vacuum pump/gas supply source 360 through the pipeline 370 and the quick connector 380 in sequence. The UV lamp manufacturing apparatus 300 can be used to control the fluid communication between the tube body 410 of the UV lamp 400 and the vacuum pump/gas supply source 360 . For example, the communication between the tube body 410 and the vacuum pump/gas supply source 360 can be opened or closed by turning the switch 318 of the needle valve 310 .

Referring to FIG. 1 again, step 110 may be performed to insert the first electrode of the ultraviolet lamp tube 400 into the second end 414 of the tube body 410 . Next, step 120 may be performed to seal the second end 414 of the tube body 410 . In some examples, the second end 414 may be sealed by melting the second end 414 of the tube body 410 . For example, when sealing the second end portion 414 , a method of fusing a part of the second end portion 414 may be used.

After the second end portion 414 is sealed, step 130 may be performed to first pump the tube body 410 from the first end portion 412 of the tube body 410 through the vacuum switch valve device of the ultraviolet lamp tube manufacturing apparatus 300 by using the vacuum pump 360 Vacuum operation. Through the first vacuuming operation, the required vacuum degree in the tube body 410 can be achieved. In some exemplary examples, during the first vacuuming operation, the communication between the pipe body 410 and the vacuum pump 360 can be opened through the switch 318 of the needle valve 310, and then the vacuum pump 360 can be installed through the vacuum switch valve. Set to evacuate the tube body 410.

Next, the communication between the pipe body 410 and the vacuum pump 360 can be closed first through the switch 318 of the needle valve 310 . And while the tube body 410 is kept in a vacuum state, step 140 is performed to weld the first electrode and the second end 414 of the tube body 410 . When welding the first electrode and the second end portion 414 , the UV lamp manufacturing apparatus 300 and the vacuum pump 360 can be separated first. Then, the long axis of the tube body 410 is used as the rotation axis to rotate the tube body 410 . By rotating the tube body 410 while melting, the first electrode and the inner side surface of the second end portion 414 surrounding the first electrode can be welded together. That is, the second end portion 414 completely surrounds the first electrode to form an airtight bond between the first electrode and the second end portion 414 .

Next, step 150 may be performed to inject the first inert gas into the pipe body 410 from the first end portion 412 through the vacuum switch valve device. In some examples, the vacuum pump 360 can be replaced with a gas supply source 360 capable of supplying the first inert gas, and the first end 412 of the pipe body 410 can be coupled with the first quick connector 340 . Through the quick connector 380, the vacuum pump 360 can be quickly and easily disassembled and the gas supply source 360 can be installed. Next, the vacuum switch valve device is opened through the switch 318 of the needle valve 310 , so that the pipe body 410 is communicated with the gas supply source 360 . Then, the first inert gas can be injected into the pipe body 410 by using the gas supply source 360 . The first inert gas can be, for example, argon or xenon. In some exemplary examples, the inside of the pipe body 410 can be in a positive pressure state when the first inert gas is injected.

Next, step 160 may be performed to place the mercury, the metal halide, and the second electrode into the tube body 410 . Mercury and metal halides are placed in In the space of the tube body 410 between the first end portion 412 and the second end portion 414 , the second electrode is placed in the first end portion 412 . In some examples, when step 160 is performed, the vacuum switch valve device may be closed first to close the communication between the gas supply source 360 and the pipe body 410 . Then, the pipe body 410 is removed from the vacuum switch valve device. Then, the mercury, the metal halide, and the second electrode can be placed into the tube body 410 from the first end 412 of the tube body 410 . The halide of the metal halide can be, for example, iodine. The metal in the metal halide can be selected according to the desired emission wavelength of the UV lamp 400 . For example, when the desired emission wavelength of the UV lamp 400 falls within the UVA range, the metal in the metal halide may be iron.

Next, step 170 may be performed to perform a second vacuuming operation on the tube body 410 from the first end 412 of the tube body 410 through the vacuum switch valve device of the ultraviolet lamp tube manufacturing apparatus 300 . Through the second vacuuming operation, the required vacuum degree in the tube body 410 can be achieved. In some examples, the gas supply source 360 may be replaced with a vacuum pump 360 first. Through the quick connector 380, the gas supply source 360 can be disassembled and the vacuum pump 360 can be installed quickly and easily. Next, the communication between the pipe body 410 and the vacuum pump 360 is opened through the switch 318 of the needle valve 310 . Subsequently, the tube body 410 is evacuated by the vacuum pump 360 through the vacuum switching valve device.

After the second vacuuming operation is completed, step 180 may be performed to inject the second inert gas into the pipe body 410 from the first end 412 through the vacuum switching valve device. The second inert gas can be, for example, the same or different inert gas as the first inert gas. In some illustrative examples, the second inert gas is the same inert gas as the first inert gas. The second inert gas can be, for example, Argon or Xenon. When injecting the second inert gas into the pipe body 410 , the vacuum pump 360 may be first disassembled and replaced with a gas supply source 360 capable of supplying the second inert gas. Then, the vacuum switch valve device is opened through the switch 318 of the needle valve 310 , so that the pipe body 410 is communicated with the gas supply source 360 . Next, the second inert gas is injected into the tube body 410 using the gas supply source 360 . In some exemplary examples, the inside of the tube body 410 can be in a negative pressure state when the second inert gas is injected.

After the second inert gas is injected into the tube body 410 , step 190 may be performed to close the vacuum switch valve device through the switch 318 of the needle valve 310 , thereby closing the communication between the gas supply source 360 and the tube body 410 .

Next, step 200 may be performed to weld the second electrode and the first end 412 of the tube body 410 . When welding the second electrode and the first end portion 412 , the manufacturing apparatus 300 of the ultraviolet lamp tube can be separated from the gas supply source 360 first. Then, the long axis of the tube body 410 is used as the rotation axis to rotate the tube body 410 . The second electrode and the inner side surface of the first end portion 412 surrounding the second electrode can be welded together by melting and burning while rotating the tube body 410 . In this way, the first end portion 412 can completely surround the second electrode, and an airtight joint is formed between the second electrode and the first end portion 412 .

After the welding between the second electrode and the first end portion 412 is completed, the first end portion 412 of the pipe body 410 can be removed from the vacuum switching device through the first quick connector 340 . So far, the fabrication of the ultraviolet lamp tube 400 is substantially completed.

As can be seen from the above-mentioned embodiments, one of the advantages of the present disclosure is that the present disclosure introduces mercury, metal halide, and inert gas into the tube body from one end of the tube body of the ultraviolet lamp, and faces the tube from the end of the tube body. Tube body pumping null. Therefore, the tube wall of the tube body is flat, and the uniformity of the illuminance of the ultraviolet lamp tube can be improved, and the parameters of the lamp tube can be prevented from being affected by the sediment. In addition, since the tube wall of the tube body is flat, the convenience of installation and use of the lamp tube can be improved.

Another advantage of the present disclosure is that because there is no side tube on the tube body of the UV lamp of the present disclosure, the manpower and time for manufacturing the side tube, removing the side tube, and stress removal and inspection after the side tube is removed can be saved, And can reduce production costs.

Another advantage of the present disclosure is that because the ultraviolet lamp tube manufacturing apparatus of the present disclosure includes a vacuum switch valve device that can communicate with the vacuum pump and one end of the tube body, mercury, metal halide, and inert gas, and vacuum. Thereby, the manufacturing process can be simplified and the production capacity can be increased. In addition, the vacuum switch valve device can be reused. Compared with the conventional use of two side pipes which cannot be recycled and reused at one time, the present disclosure can greatly save costs and avoid waste of resources.

Although the present disclosure has been disclosed above with examples, it is not intended to limit the present disclosure. Anyone with ordinary knowledge in this technical field can make various changes and modifications without departing from the spirit and scope of the present disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the appended patent application.

300: Manufacturing equipment for UV lamps

310: Needle valve

312: First End

314: Second End

316: Subject

318: switch

320: The first connecting pipe

322: First End

324: Second End

330: Second connecting pipe

332: First End

334: Second End

340: The first quick connector

342: First End

344: Second End

350: Second quick connector

352: First End

354: Second End

360: Vacuum Pump/Gas Supply Source

370: Pipeline

380: Quick Connector

400: UV lamp tube

410: Tube body

412: First End

414: Second End

Claims (8)

A method for manufacturing an ultraviolet lamp tube, comprising: connecting a first end of a tube body with a first interface of a vacuum switch valve device, wherein a second interface of the vacuum switch valve device and a vacuum pump or a gas supply source communication, the vacuum switch valve device is configured to open or close the communication between the tube body and the vacuum pump or the gas supply source; place a first electrode in a second end of the tube body; seal the the second end; after sealing the second end, perform a first vacuum operation on the pipe body through the vacuum switch valve device; after the first vacuum operation, the pipe body is kept in a vacuum state Next, weld the first electrode and the second end; after welding the first electrode and the second end, inject a first inert gas into the tube through the vacuum switch valve device; inject the first After the inert gas is in the tube body, a mercury, a metal halide, and a second electrode are placed in the tube body; after the mercury, the metal halide, and the second electrode are placed in the tube body, through The vacuum switch valve device performs a second vacuuming operation on the tube body; after the second vacuuming operation, injects a second inert gas into the tube body; after injecting the second inert gas into the tube body, closing the vacuum switch valve device; and after closing the vacuum switch valve device, welding the second electrode and the first electrode Ends. The method of claim 1, wherein sealing the second end includes fusing a portion of the second end. The method of claim 1, wherein performing the first vacuuming operation and performing the second vacuuming operation each comprises: opening the vacuum switch valve device to make the pipe body communicate with the vacuum pump; and using the vacuum pump to The tube body is evacuated. The method of claim 1, wherein the first inert gas and the second inert gas are the same inert gas, and injecting the first inert gas and injecting the second inert gas each comprises: opening the vacuum switch valve device , so that the pipe body is communicated with the gas supply source; and the inert gas is injected into the pipe body by the gas supply source. The method of claim 1, wherein each of the first inert gas and the second inert gas is argon or xenon. The method of claim 1 , wherein injecting the first inert gas includes bringing the tube into a positive pressure state; and injecting the second inert gas includes bringing the tube into a negative pressure state. The method of claim 1, wherein welding the first electrode and the second end and welding the second electrode and the first end each comprise: rotating the tube; and while rotating the tube, performing A melting process. The method of claim 1, wherein after welding the second electrode and the first end, the method further comprises removing the tube body from the vacuum switching valve device.

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