Ultralow-temperature top-mounted floating ball valve group

Abstract

The invention relates to an ultralow-temperature top-mounted floating ball valve group which comprises a valve body, at least two valve cavities which are communicated with each other are formed in the valve body side by side, a ball is arranged in each valve cavity, an upstream sealing mechanism and a downstream sealing mechanism are arranged on the two sides of each ball respectively, a valve deck connected with the valve body in a sealed mode is arranged above each ball. A valve rod connected with the ball body is arranged in the valve cover in a penetrating mode, and a packing sealing mechanism is arranged between the valve cover and the valve rod. Double valves in the ultralow-temperature top-mounted floating ball valve group share one valve seat, so that connecting nodes on pipelines can be effectively reduced, the space is saved, the cost is reduced, and the closure effect is more reliable; the valve group is reasonable in structural design, reliable in sealing effect and capable of being safely used under the ultralow-temperature working condition.

Description

technical field [0001] The invention relates to the technical field of ball valves, in particular to an ultra-low temperature top-mounted floating ball valve group. Background technique [0002] As the fastest growing clean energy in the world today, LNG is one of the country's current key promotion tasks for adjusting the energy structure. With the rapid development of LNG plants, receiving stations, transportation, gasification stations and other projects, the status of ultra-low temperature valves is becoming more and more important. [0003] In order to ensure the reliability of pipeline cutoff in the above projects, multiple ultra-low temperature valves are usually installed on the pipeline, and the layout of multiple single valves needs to control the sealing performance of each node. This method is costly and requires a lot of installation work. In the case of specific working conditions or limited design space, there is a problem that some single valves cannot be ins...

AI Technical Summary

Problems solved by technology

[0003] In order to ensure the reliability of pipeline cutoff in the above projects, multiple ultra-low temperature valves are usually installed on the pipeline, and the layout of multiple single valves needs to control the sealing performance of each node. This method is costly and requires a lot of installation work. In the case of specific working conditions or limited design space, there is a problem that some single valves cannot be installed

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