Russian supply flashboard sealing surface surfacing layer repairing method

Abstract

The invention belongs to the technical field of surfacing, and particularly relates to a Russian supply flashboard sealing surface surfacing layer repairing method. The method comprises the followingsteps of determining a welding material of sealing surface surfacing and a welding process; detecting the fusion performance of an original surfacing layer section of the sealing surface; determiningthe thickness of a to-be-surfaced surfacing layer of the sealing surface; removing the original surfacing layer of the sealing surface; surfacing the sealing surface according to the determined surfacing welding material and welding process of the sealing surface; processing and treating the sealing surface after surfacing; carrying out nondestructive testing on the repaired flashboard. Accordingto the method, the surfacing layer of the Russian supply flashboard sealing surface can be effectively repaired, the repaired flashboard sealing surface can ensure good sealing performance of a valve,the number of flashboard replacement spare parts is greatly reduced, and the maintenance cost is effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of surfacing welding, and in particular relates to a method for repairing the surfacing welding layer on the sealing surface of a gate plate supplied by Russia. Background technique [0002] The gate is the key sealing part of the electric gate valve. It is the opening and closing part of the valve. The gate and the valve seat together realize the sealing function of the valve. Since the gate and the seat will produce friction when the valve is working, the gate will be damaged after long-term operation. Wear occurs, especially when the wedge gate valve operates under high temperature and high pressure difference environment, the wear phenomenon of the gate sealing surface is more serious, so the gate sealing surface should have good wear resistance. During the maintenance work, we found that the surfacing layer of the sealing surface of the main steam isolation valve and the outlet isolation valve of the ma...

AI Technical Summary

Problems solved by technology

[0003] The wear of the gate sealing surface will lead to the failure of the valve seal, and a new gate needs to be replaced. Most of the gate valves of VVER units are supplied by Russia. Restricting factors such as monopoly will affect the reserve of ram spare parts in the later stage. In order to avoid the replacement of ram spare parts and reduce maintenance costs, it is necessary to carry out the localization and repair of rams supplied by Russia.

Images