Comprehensive performance evaluation method for surfacing layer of sealing surface of valve seat

Abstract

The invention discloses a method for evaluating the comprehensive performance of a surfacing layer of a sealing surface of a valve seat, which comprises the following steps of: (1) determining the working temperature of the valve seat according to the purpose of the valve seat; (2) at the working temperature of the valve seat, performing a high-low temperature cycle test to obtain the fatigue resistance and high temperature resistance of the surfacing layer of the sealing surface of the valve seat; (3) performing a high-temperature impact test at the working temperature of the valve seat to obtain the impact resistance and high-temperature resistance of the surfacing layer of the sealing surface of the valve seat; (4) performing a high-temperature friction wear test at the working temperature of the valve seat to obtain the wear resistance and high-temperature resistance of the surfacing layer of the sealing surface of the valve seat; and (5) performing a high-temperature solid particle erosion test at the working temperature of the valve seat to obtain the erosion resistance and high-temperature resistance of the surfacing layer of the sealing surface of the valve seat. According to the evaluation method, whether the performance of the sealing surface surfacing layer reaches the standard or not is comprehensively evaluated through multiple performance tests, and an evaluation analysis method is provided for the valve seat sealing surface surfacing layer.

Description

technical field [0001] The invention relates to the technical field of valve seat sealing surfaces, in particular to a comprehensive performance evaluation method for a surfacing layer on the valve seat sealing surface. Background technique [0002] The sealing surface refers to the contact surface where the opening and closing parts and the valve seat are closely fitted and has a sealing effect. The surfacing welding of the sealing surface of the steam turbine valve seat is an important process in the manufacture of the steam turbine valve seat, and the quality of the surfacing welding of the sealing surface of the valve seat is largely Determines the manufacturing quality of the valve seat. Similarly, the quality of the sealing surface surfacing largely determines whether the valve core fails or fails, and determines its service life. The sealing surface is the most critical working surface of the valve seat. The quality of the sealing surface The quality of the valve seat...

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Problems solved by technology

[0003] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a comprehensive performance evaluation method for the surfacing layer of the valve seat sealing surface, so as to solve the problem in the prior art that there is no professional comprehensive evaluation method for the current valve seat sealing surface

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