Double-layer sealing type lift valve

Abstract

The invention discloses a double-layer sealing type lift valve which comprises a valve body, a valve plate assembly and a lifting driving device connected with the valve plate assembly, wherein an upper-layer valve seat and a lower-layer valve seat are arranged inside the valve body, sealing strips are arranged on the upper-layer valve seat and the lower-layer valve seat respectively, the valve plate assembly comprises an upper-layer valve plate matched with the upper-layer valve seat and a lower-layer valve plate matched with the lower-layer valve seat, and a compression spring is arranged between the upper-layer valve plate and the lower-layer valve plate. According to the double-layer sealing type lift valve, the double layers of valve seats are arranged in the valve body, the corresponding double layers of valve plates are arranged, the compression spring is arranged between the two layers of valve plates, repulsive force is provided for the double layers of valve plates through the compression spring, and in this way, the sealing performance of the lift valve is effectively guaranteed, the situation that the sealing performance is reduced due to deformation of the valve seats or ash is avoided, and then the safety performance of a dedusting system is effectively improved and normal work of a boiler system can be effectively guaranteed.

Description

technical field [0001] The invention relates to a valve, in particular to a double-layer sealing lift valve on a bag dust collector used for controlling air pollution. Background technique [0002] As a boiler auxiliary system, the dust removal system is a part of the overall boiler system. In order to better meet the needs of the normal operation of the boiler system, avoid damage to the filter bag caused by abnormal boiler flue gas, and ensure that the normal operation of the boiler system is not affected, it must be installed in the dust removal system. The bypass system is set up in the center, and the most critical components are the inlet and outlet shut-off valves and combined bypass valves. [0003] For example, when the bag filter is working normally, in order to make the flue gas emission concentration meet the national standard, it is necessary to ensure that the leakage rate of the combined bypass valve is 0. At the same time, when the boiler has abnormal flue g...

AI Technical Summary

Problems solved by technology

[0005] Neither of the above two bypass valves can effectively protect the filter bag of the bag filter. Once the filter bag is damaged, it will cause great losses. However, no effective solution has been proposed for this technical problem in related technologies.

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