Sealing pair of dual-sealing-face valve, dual-sealing-face valve and application of dual-sealing-face valve serving as bypass valve

Abstract

The invention relates to a sealing pair of a dual-sealing-face valve, the dual-sealing-face valve and application of the dual-sealing-face valve serving as a bypass valve. According to the sealing pair of the dual-sealing-face valve, a valve seat is provided with a first sealing face and a second sealing face; a valve element comprises a first valve clack and a second valve clack; the first valve clack and the second valve clack are provided with sealing faces; the second valve clack is located in a columnar groove in the lower end face of the first valve clack and is in sliding with the side wall of the columnar groove; and a thrust spring used for pushing the second valve clack downwards is arranged between the first valve clack and the second valve clack. The dual-sealing-face valve comprises a valve body and a main sealing pair. The sealing pair of the dual-sealing-face valve is adopted as the main sealing pair. An auxiliary valve sealing pair and a corresponding auxiliary valve medium channel can be arranged on the first valve clack. The above valve can be used as the bypass valve, especially the bypass valve of a bypass system of a steam turbine. The sealing performance of the valve can be improved, and bypass leaking of the valve or the steam turbine can be avoided or relieved.

Description

technical field [0001] The invention relates to a double sealing surface valve sealing pair, a double sealing surface valve adopting the valve sealing pair and the application of the double sealing surface valve as a bypass valve, especially the application in a steam turbine bypass system. Background technique [0002] At present, the steam turbine bypass system supporting the thermal power generation unit plays an important role in the start-up, shutdown and operation of the unit. It is used to increase the steam pressure and steam temperature of the boiler during the start-up process of the unit, and is used to recover The working fluid is used to prevent boiler overpressure during unit accident tripping and load shedding. However, at present, the bypass valves of many power plants have the defect of internal leakage. The internal leakage of the bypass valve will cause part of the steam to bypass the corresponding cylinder of the steam turbine, which will reduce the worki...

AI Technical Summary

Problems solved by technology

However, at present, the bypass valves of many power plants have the defect of internal leakage. The internal leakage of the bypass valve will cause part of the steam to bypass the corresponding cylinder of the steam turbine, which will reduce the working ability of the steam turbine and reduce the operating economy; at the same time, it may also cause the boiler Low temperature reheater tube wall temperature overheating; possible increase in turbine exhaust temperature

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