Three-way hemispherical valve based on normal operation and online pressure maintenance of pipeline and maintenance method

Abstract

The invention relates to a three-way hemispherical valve based on normal operation and online pressure maintenance of a pipeline. The valve comprises a valve body and a hemispherical valve core; threechannels are formed in the valve body and include a fluid entering channel, a fluid flowing-out channel and an online maintenance channel; an opening and closing sealing pair matched with the hemispherical valve core for sealing is arranged in the fluid flowing-out channel; a maintenance sealing pair matched with the hemispherical valve core for sealing is arranged in the online maintenance channel; a maintenance sealing gland is mounted on the outer end surface of the online maintenance channel; a pressure relief component and a pressure gauge which communicate with the online maintenance channel are arranged on the online maintenance channel; the hemispherical valve core is located in a valve cavity of the valve body; and a hemispherical valve core rotating shaft is mounted on the valvebody and is connected with an external driving device. The invention further relates to an online pressure maintenance method on the basis of the hemispherical valve. According to the valve and the method, normal operation and online maintenance operation of the pipeline can be realized, the problem that normal operation and online maintenance of the pipeline cannot be realized by the aid of hemispherical valves or other valves in the market at present is solved, the maintenance cost is reduced, the maintenance operation time is shortened, and the labor intensity is reduced.

Description

technical field [0001] The invention belongs to the technical field of hemispherical valves, and in particular relates to a three-way hemispherical valve and a maintenance method based on online maintenance under pressure in the normal operation of pipelines. Background technique [0002] At present, the valve is a mechanical device that controls the flow, flow direction, pressure, temperature, etc. of the flowing fluid medium. The valve fittings are technically the same as the pump, and they are the basic components in the pipeline system and the key components of the pipeline switch adjustment control. The hemispherical valve is a new type of valve developed to solve the technical problems of transporting two-phase mixed flow media such as solution and ore slurry. The hemispherical valve is a kind of practical operation product. Its actuator is equipped with an actuator, which is more convenient for users to operate. It is light, long-distance automatic operation, and has ...

AI Technical Summary

Problems solved by technology

When the valve core rotates 45° clockwise around O under the drive of the valve shaft, the spherical surface c of the valve core is in close contact with the valve seat C and is wedged tightly and self-locked to achieve a forced seal; at this time, the channel of the valve C is closed, forming A-B communication The straight-through channel; the three-way hemispherical valve recorded in this patent document can not realize the online maintenance under the condition of normal operation

[0014] The top-mounted eccentric hemispherical valve in the prior art can only be installed and disassembled from the upper part of the valve without dismantling it from the pipeline, but the online maintenance cannot be realized under the condition of normal operation

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