Structure of side exhaust electromagnetic pressure relief valve for main steam system of power station

Abstract

The invention discloses a side-exhaust steam electromagnetic pressure relief valve structure for the main steam system of a power station. It is composed of the outer disc, and the upper side of the sealing surface is provided with an elastic gap composed of a cone surface. There is also an elastic groove on the conical surface of the hot valve disc, and a number of small holes are drilled outward at the elastic groove. The lower end of the outer disc is in the There is an anti-seize edge protection near the outer side of the sealing surface, and a thermal compensation groove and a condensate storage structure are provided for the auxiliary valve seal. The body and cover adopt multiple combined sealing structures. The escape structure, the column adopts the heat dissipation column, and the flow channel structure is optimized. Its advantages: the sealing performance of the main and auxiliary valves has been significantly improved, the elastic gap is not easy to be blocked, the height of the middle cavity is reduced, the maintenance is convenient, the sealing of the middle cavity is good, the speed of the switching valve is increased, the valve work is safer and more reliable, and the vibration and vibration during discharge There is less noise.

Description

technical field [0001] The invention relates to a valve structure, in particular to a product structure of a side exhaust electromagnetic pressure relief valve used in the main steam system of a power station. Background technique [0002] The electromagnetic pressure relief valve is an important safety pressure relief valve, which is used to quickly open and discharge steam when the pressure of the main steam (superheated steam) of the power station exceeds the specified value, so as to avoid the action of the spring safety valve of the main steam system as much as possible, so as to maintain the pressure of the main steam The performance and reliability of the safety valve, prolonging the use and maintenance cycle of the main steam safety valve, and maintaining sufficient safety assurance capabilities for the unit are important supporting valves and key valves for thermal power units. At present, the safety pressure relief valves used in the main steam system of thermal po...

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Problems solved by technology

[0008] In order to overcome the above-mentioned many inadequacies existing in the existing structure and technology, the present invention proposes a method that does not have oxidation and corrosion products entering the vicinity of the main valve disc sealing surface to affect the valve seal and condensation water to cause the sealing surface of the main valve and auxiliary valve. Leakage problem occurs, the height of the middle cavity of the valve body is greatly reduced, the sealing structure of the middle cavity is simplified, the sealing ability of the middle cavity is effectively improved, the processing and maintenance are convenient, the sealing surface of the main valve and the auxiliary valve has sufficient thermal compensation ability and better sealing Reliability, the sealing surface of the main valve disc has strong elastic compensation ability, the elastic deformation gap at the elastic tongue is not easy to be blocked, the opening and closing valve speed of the valve is increased, and the opening and closing pressure difference is reduced, and the spring is added in the main valve disc to It provides initial sealing ability and is beneficial to overcome jamming and assist valve clack closing to improve the reliability of the valve clack. The valve has better structural stability, less vibration and noise when discharging steam, and can operate in supercritical and ultrasuper The structure of the side exhaust electromagnetic pressure relief valve for the main steam system of the power station that is safely and reliably used on the critical unit

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