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A kind of off-line maintenance method of wear-resistant disc valve

A wear-resistant disc and off-line technology, applied in the field of special valve maintenance, can solve the problems of bad working conditions, cracked stuffing box, valve can not move, etc., and achieve the effect of reducing valve failure rate, saving maintenance cost and prolonging service life.

Active Publication Date: 2018-05-29
YICHANG CSG POLYSILICON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to its harsh working conditions, the crankshaft is often stuck causing the valve to fail to move, the crankshaft is corroded causing leakage, and the stuffing box is cracked causing leakage, etc., seriously affecting production stability.
In the production process, the corrosion of the crankshaft is often not found in time. After the corrosion reaches a certain level, the packing and the crankshaft cannot be tightly matched, and leakage is formed.
The crack repair of the stuffing box can only treat the symptoms but not the root cause.

Method used

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  • A kind of off-line maintenance method of wear-resistant disc valve

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Experimental program
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Effect test

Embodiment 1

[0027] After the crankshaft is removed, it can be seen that the surface is covered with irregular grooves due to corrosion, accompanied by rust. The maintenance process, the operation steps are as follows:

[0028] 1. Remove the crankshaft, clean it and dry it, and polish the crankshaft with sandpaper to remove all attached rust;

[0029] 2. Use a vernier caliper to measure the outer diameter of the crankshaft and the inner diameter of the packing ring, and record them for future use;

[0030] 3. Use a metal analyzer to determine the material of the crankshaft;

[0031] 4. According to the surface corrosion of the crankshaft (groove depth), use a lathe to plan the corroded surface layer of the crankshaft. The thickness of the planed surface is determined according to the corrosion situation, generally 5~8mm. The length of the planed surface layer is determined according to the corrosion condition and the depth of the stuffing box to ensure that all parts inside the stuffing ...

Embodiment 2

[0048] For stuffing boxes with brittle corrosion cracks, conduct a comprehensive inspection and repair them in a fully compensated manner. The repair steps are as follows:

[0049] 1. Use a carbon planer to remove the welding seam between the stuffing box and the valve body, and take out the stuffing box;

[0050] 2. Clean the stuffing box and remove the debris inside and outside the stuffing box;

[0051] 3. Use a vernier caliper to measure the inner diameter, outer diameter and length of the stuffing box;

[0052] 4. Use a metal analyzer to check the stuffing box material;

[0053] 5. According to the material inspection results, use metal rods of the same material, and the diameter of the rods should exceed the outer diameter of the original stuffing box by 5~8mm. You can also choose a thicker bar according to your needs, so that the wall thickness of the stuffing box after processing is thicker;

[0054] 6. After the bar material is obtained, use a milling machine to d...

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Abstract

The invention discloses an off-line maintenance method for a wear-resistant disc valve. For repairing a damaged crankshaft, different welding materials can be adopted for surfacing according to various materials of crankshafts; and a stuffing box with brittle corrosion cracking can be processed according to full size with a metal bar, and then is welded with a valve body. The off-line maintenance method for the wear-resistant disc valve has the characteristic that the surfacing thickness and the inner diameter of the stuffing box can be adjusted according to wear pattern of filler or difference of the inner diameter of filler during application, after processing and polishing, a shaft is matched with the filler in the stuffing box close, and sealing performance is excellent. The off-line maintenance method can be used for efficiently and quickly repairing the wear-resistant disc valve applied to a special working condition, maintenance cost is saved, and the failure rate of the valve is reduced.

Description

technical field [0001] The invention belongs to the field of maintenance of special valves, and relates to an off-line maintenance method of wear-resistant disc valves, in particular to partial compensation maintenance for crankshaft corrosion and complete compensation maintenance for brittle corrosion cracking of stuffing boxes. Background technique [0002] In the polysilicon industry, some materials contain a large amount of Si or SiO 2 Such as particulate matter with a Mohs hardness of 7 or higher, so wear-resistant valves are widely used in the polysilicon industry. [0003] Due to its harsh working conditions, the crankshaft is often stuck causing the valve to fail to move, the crankshaft is corroded causing leakage, and the stuffing box is cracked causing leakage, which seriously affects the production stability. In the production process, the corrosion of the crankshaft is often not found in time. After the corrosion reaches a certain level, the packing and the cran...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P6/00
CPCB23P6/00
Inventor 陶林陈卫国朱唐诗周志刚刘云安
Owner YICHANG CSG POLYSILICON CO LTD
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