Gate valve for natural gas well mouth

Abstract

The invention discloses a gate valve for a natural gas well mouth. The gate valve comprises a valve body and a valve plate. Flanges are arranged on the two sides of the valve body, a through runner isarranged in the middle of the valve body, a cavity is formed in the middle of the runner to be adopted as a valve cavity, the upper portion of the valve cavity runs through the valve body, the two parts, partitioned by the valve cavity, of the runner are adopted as an inlet runner and an outlet runner, the valve plate is of a rectangular structure and is installed in the valve cavity, one side makes contact with the valve cavity in the direction of the inlet runner, the other side makes contact with the valve cavity of the outlet runner, a valve rod is arranged above the valve plate, and a handle is installed at the upper end of the valve rod; a sealing packing is arranged at the position, penetrating out of the valve body, of the cavity and is tightly attached to the valve rod, a slidingsealing block is arranged at the position where the upper end of the valve plate makes contact with the valve rod, the two sides of the sliding sealing block are tightly attached to the valve cavity,a transverse sealing protrusion section is arranged below the valve plate, and the sealing protrusion section is of a semicircular structure; a plurality of metal protrusion sections are arranged atthe lower section of the valve cavity. By improving the structure of a conventional valve, blocking and sealing can be better achieved, and the safety effect is achieved.

Description

technical field [0001] The invention relates to the technical field of natural gas exploitation, in particular to a gate valve for a natural gas wellhead. Background technique [0002] At present, in the production of natural gas wells, throttling is generally carried out underground, and then the medium-pressure design is adopted for the surface gas transmission pipeline. The rupture of the downstream pipeline causes a large amount of leakage of natural gas. Therefore, a closure device with high and low pressure protection functions must be installed at the natural gas wellhead. At present, wellheads generally use gate valves or other similar devices to realize this function, such as the Chinese patent "Opening and closing valve for natural gas wellhead pipeline" with the authorization number CN102373899B, which discloses a self-energy through the medium in the valve body. The chamber and the lower chamber have different contact areas with the medium, forming a power openi...

AI Technical Summary

Problems solved by technology

At present, wellheads generally use gate valves or other similar devices to realize this function, such as the Chinese patent "Opening and closing valve for natural gas wellhead pipeline" with the authorization number CN102373899B, which discloses a self-energy through the medium in the valve body. The chamber and the lower chamber have different contact areas with the medium, forming a power opening and closing valve to lift the spool, which is characterized by the ability to open and close the valve without using electricity, and its sealing effect will inevitably decrease with the thickness of the spool , there is a certain risk, in some areas, it is not applicable, its role is relatively limited, and it does not meet the needs of gas fields

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