Grinding process of conical surface sealing valve

Abstract

The invention discloses a grinding process of a conical surface sealing valve. The grinding process comprises the steps that pits in the sealing surface of a valve core are subjected to repair welding, and the valve core sealing surface subjected to repair welding is subjected to mechanical machining so as to eliminate concave and convex defects on the valve core sealing surface; a grinding head with the shape of the grinding surface being the same as that of the valve core sealing surface is adopted, abrasive paper is fixed to the grinding surface to grind a valve seat. By the application ofthe grinding process of the conical surface sealing valve provided by the invention, the grinding quality of the valve core and the grinding quality of the valve seat can be controlled correspondinglyso that the valve core and the valve seat can reach the sealing requirements step by step. Repair welding and mechanical machining are adopted, the work amount and work time are greatly reduced, andthe damage defects of the valve sealing surface can be processed in the limited defect elimination time so that the valve core and the valve seat of the valve can be sealed tightly and reach the operation requirements. Meanwhile, the grinding head is adopted to grind the valve seat, the grinding head with the weight being obviously smaller than that of the valve core can be selected, and thus strain of the sealing surface caused by excessively large grinding resistance in the oppositely grinding process can be avoided.

Description

technical field [0001] The invention relates to the technical field of valves, and more specifically relates to a grinding process for a tapered sealing valve. Background technique [0002] As a very common component of the pipeline system, the performance of the valve has a direct impact on the pipeline system. The valve includes a valve core and a valve seat, and the valve core and valve seat can be sealed by a cone surface. The low bypass valve of a large thermal power plant is a common cone-sealed valve. [0003] The bypass system is an almost indispensable and important part of the intermediate reheat unit in a large thermal power plant. Its main function is to protect the reheater, shorten the start-up time of the unit, reduce the heat loss during start-up, increase the flexibility of the unit operation and extend the The service life of the unit. The bypass system has become an important factor to ensure the safe, stable operation and economy of the unit. However,...

AI Technical Summary

Problems solved by technology

[0006] In view of this, the object of the present invention is to provide a grinding process for cone-surface sealing valves, which can effectively solve the time-consuming and labor-consuming problem of avoiding internal leakage of large valves through grinding

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