Novel triple-seal anti-scouring stop valve

Abstract

The invention discloses a novel triple-seal anti-scouring stop valve which is widely applied to power station boilers and turbine systems. The novel triple-seal anti-scouring stop valve comprises a valve body, a liner, a valve seat, an auxiliary valve clack, an auxiliary valve gland, a main valve clack, a main valve gland, a spring, a throttle sleeve, a valve rod, a valve cover and valve rod, anda throttle window. The valve seat and the valve body are sealed by compressing the liner. Through the main valve gland, the valve rod drives the valve clack to be opened to move up and down along thethrottle sleeve. The main valve clack and the auxiliary valve clack are connected through the auxiliary valve gland. The main valve clack is provided with the spring. When the valve is opened, the main valve clack, the auxiliary valve clack and the throttle window are opened sequentially. When the valve is closed, the process is opposite. The novel triple-seal anti-scouring stop valve with a novelstructure has the advantages that three seals, including an annular seal and two conical-surface seals (or flat-surface seals) are realized when the valve is closed, damage of impurities to sealing surfaces is avoided, and scouring of media on main and auxiliary sealing surfaces is reduced, so that service life of the valve is prolonged, and good sealing effect is achieved.

Description

technical field [0001] The invention relates to a novel triple-seal anti-scour stop valve, which belongs to the field of power station valves. Background technique [0002] Anti-scouring globe valves are widely used in boiler and steam turbine systems in power plants. In this system, the working environment of valves is poor, especially in the working conditions of high-temperature and high-pressure media. The erosion and damage to the sealing surface during passage are serious, resulting in internal leakage of the valve, which requires multiple repairs and affects the service life of the valve. Contents of the invention [0003] The purpose of the present invention is to provide a novel triple seal anti-scouring stop valve, the performance of which is more suitable for high temperature and high pressure working conditions in the field of power stations. During the closing process of the valve, firstly, the valve clack closes the window of the throttle sleeve first, throt...

AI Technical Summary

Problems solved by technology

[0002] Anti-scouring globe valves are widely used in boiler and steam turbine systems in power plants. In this system, the working environment of valves is poor, especially in the working conditions of high-temperature and high-pressure media. The erosion and damage to the sealing surface are serious when passing through, resulting in internal leakage of the valve, which requires multiple repairs and affects the service life of the valve

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