Method of off-line repair and pressure test of 650 relief valve of blast furnace

A release valve, off-line technology, applied in the direction of mechanical valve testing, etc., can solve the problems of increasing maintenance costs, spending a long time, increasing labor intensity of workers, etc., to reduce the possibility of loose valve cover sealing, reduce labor intensity, and reduce The effect of maintenance costs

Active Publication Date: 2021-06-08
SHANGHAI BAOSTEEL IND TECHNOLOGICAL SERVICE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many problems in the past pressure test process: 1. It is necessary to adjust the preload force of the disc spring preload device to ensure that the preload force meets the work requirements
It not only increases the labor intensity of workers, but also increases the maintenance cost; 2. The structure of the fastening soft seal device is too cumbersome, and it takes a long time to adjust each time; 3. The hard alloy position between the valve cover and the valve seat Difficult to adjust
It is precisely because of these three problems that the 650 relief valve offline repair period is often long and the repair effect is not ideal

Method used

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  • Method of off-line repair and pressure test of 650 relief valve of blast furnace
  • Method of off-line repair and pressure test of 650 relief valve of blast furnace
  • Method of off-line repair and pressure test of 650 relief valve of blast furnace

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Experimental program
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Effect test

Embodiment 1

[0030] Embodiment 1: see figure 1 , figure 2 , figure 1 It is an enlarged drawing of the valve cover and seat assembly of the 650 relief valve, figure 2 It is the processing location map of the 650 relief valve seat. The seat of the 650 relief valve is processed. When all the repaired dimensions of the valve seat meet the requirements, a 1.5mm wide by 1.5mm is machined at the center of the seat on the part that is in contact with the seal. The deep groove, when the seal is stressed, will make a small part of the soft seal squeeze into the notch of 1.5mm*1.5mm, which is beneficial to the sealing of the 650 relief valve.

[0031] Please see image 3 , image 3 It is a schematic diagram of the modification of the valve cover and valve seat. Retrofit the hard sealing position of the original bonnet and valve seat (such as figure 1 with image 3 As shown), the hard seal between the bonnet and the valve seat is processed by vertical lathe, and the slope of the car is change...

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Abstract

The invention relates to a method for off-line repair and pressure test of a 650 relief valve of a blast furnace. The method is as follows: 1) processing the valve seat of the 650 relief valve, 2) modifying the hard seal position of the valve cover and the valve seat, 3) transforming the soft seal tightness 4) Under the condition of not affecting the use of the relief valve, weld the tooling installation hanging feet on the body of the 650 relief valve at a position of 90 degrees to the disc spring tube, which is convenient Tooling installation; 5) Pressure test operation. The method can quickly and safely carry out the pressure test operation, reduces the labor intensity of the operating personnel during the operation process, and also reduces the maintenance cost.

Description

technical field [0001] The invention relates to a repair method, in particular to a method for offline repair and pressure testing of a 650 relief valve of a blast furnace, and belongs to the technical field of metallurgical blast furnace equipment repair. Background technique [0002] The working principle of the 650 relief valve is to use the self-locking of the dead point position of the four-bar linkage mechanism and the pressure of the disc spring pre-tensioning device. The relief valve can be effectively closed when the working pressure is reached, and automatically opened to release pressure when the pressure exceeds the safe value, so as to ensure the safe operation of the blast furnace. Therefore, when the 650 relief valve is repaired off-line, it is particularly important to conduct a pressure test to simulate the blast furnace pressure. There are many problems in the previous pressure test process: 1. The preload of the disc spring preload device should be adjust...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M13/003
Inventor 张春宇陈水静
Owner SHANGHAI BAOSTEEL IND TECHNOLOGICAL SERVICE
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