Lateral steam discharge electromagnetic pressure relief valve structure for electric station main steam system

Abstract

The invention discloses a lateral steam discharge electromagnetic pressure relief valve structure for an electric station main steam system. A valve adopts a double-side air exhaust and main and auxiliary valve integral structure, a valve body is a casting workpiece or a forging workpiece, a valve flap assembly consists of a heat valve flap and an outer valve flap, the upper side of the sealing surface is provided with an elastic gap formed by a cone surface, an elastic groove is also formed in the conical surface part of the heat valve flap, a plurality of small holes are outwards drilled in the elastic groove part, the lower end of the outer valve flap is provided with a clamp prevention protection edge in the position near the outer side of the sealing surface, a heat compensation groove and a condensed water accommodating structure are arranged in a sealed way aiming at the auxiliary valve, a body and a cover adopt multiplex combined sealing structures, a spring is additionally arranged in the valve flap assembly, the upper end of a valve cover is provided with a steam escape prevention structure, upright posts adopt heat radiation upright posts, and a flow passage structure is subjected to optimization design. The lateral steam discharge electromagnetic pressure relief valve structure has the advantages that the sealing performance of a main value and an auxiliary valve are obviously improved, the elastic gap cannot be easily clamped and blocked, the height of a middle cavity is reduced, the maintenance is convenient, the sealing performance of the middle cavity is good, the valve opening and closing speed is accelerated, the work of the valve is safer and more reliable, and the vibration and the noise are lower during discharging.

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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