Method for maintaining butterfly valve sealing mechanism on line

Abstract

The invention relates to a method for maintaining a butterfly valve sealing mechanism on line. The butterfly valve sealing mechanism comprises a groove which is formed on a valve body, and a sealing ring which is arranged in the groove, wherein the sealing ring is provided with a dovetail groove-shaped edge which is inserted into the groove in an inverted mode; resin is injected between the dovetail groove-shaped edge and the groove; a hole is formed on the surface of the valve body and is communicated with the groove; and the resin is injected into the groove through the hole. The method is characterized by comprising the following steps of: when the sealing ring is worn or broken, closing the butterfly valve, breaking the sealing of the hole, injecting the resin into the groove through the hole to ensure that the sealing ring squeezes a butterfly plate of the butterfly valve outwards until the sealing ring and the butterfly plate are sealed completely, sealing the hole, and solidifying the resin to finish maintenance. According to the method, by adoption of online maintenance, direct maintenance of the butterfly valve sealing mechanism can be realized under the condition that the butterfly valve is not dismounted, so that inconvenience caused by the conventional maintenance method is avoided, the maintenance time is shortened, the loss caused by the maintenance is reduced, and the maintenance difficulty is reduced.

Description

technical field [0001] The invention relates to an online maintenance method for a sealing mechanism of a butterfly valve. Background technique [0002] Butterfly valve, also known as flap valve, is a regulating valve with simple structure, and it can also be used for switch control of low-pressure pipeline medium. Butterfly valve refers to a valve whose closing part (disc or butterfly plate) is a disc, which rotates around the valve shaft to open and close. It mainly plays the role of cutting and throttling on the pipeline. The opening and closing part of the butterfly valve is a disc-shaped butterfly plate that rotates around its own axis in the valve body to achieve the purpose of opening and closing or adjustment. Butterfly valves are suitable for pipelines conveying various corrosive and non-corrosive fluid media in engineering systems such as generators, gas, natural gas, liquefied petroleum gas, city gas, hot and cold air, chemical smelting and power generation envir...

AI Technical Summary

Problems solved by technology

[0003]The key to the opening and closing of the butterfly valve is the tightness between the valve body and the butterfly plate. Since the butterfly plate is in the state of opening and closing for a long time, the friction between the butterfly plate and the valve body More, both are prone to wear and tear, resulting in poor sealing or no sealing, and seriously scrapping the entire butterfly valve

At present, when there is a sealing problem between the valve body and the butterfly plate, it is often necessary to disassemble the entire butterfly valve and then repair it, but the maintenance is very inconvenient. Therefore, many butterfly valves are directly scrapped due to the inconvenience of maintenance, resulting in waste

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