Self-operated emergency cutting method of fluid pipe and self-operated flat-plate emergency cut-off valve

Abstract

The present invention discloses a self-operated emergency cutting method of oil-gas pipe. According to the method of the invention, the emergency cutting-off to the pipe is realized through a triggering mechanism and a straight-through gate valve which is controlled by the triggering mechanism for opening and closing. The invention also discloses a self-operated emergency cutting valve for realizing the method. According to the invention, as the triggering mechanism is adopted for controlling the opening and the closing of the straight-through gate valve for realizing the emergency cutting-off so that the oil-gas inlet pipe is directly communicated with the oil-gas outlet pipe, so that the throttling and pressure loss are not generated. The cleaning to the pipe and the valve by the cleaning ball is facilitated and the impurity deposit is prevented. Furthermore the cut-off valve has the advantages of simple structure, reliable safety and low production cost. The method and the cut-off valve of the invention are not only suitable for conveying the natural gas, but also are suitable for conveying other liquid or gas medium of oil, steam, etc. The method and the cut-off valve of the invention can also be used for the initial product of oil-gas containing sand, water and sulfur, and can also be used for the oil production and gas production wellhead and the middle and downstream pipe network.

Description

technical field [0001] The invention relates to an emergency cut-off method of a fluid pipeline (especially an oil, gas or steam pipeline), in particular to a self-operated emergency cut-off method and a used cut-off valve. Background technique [0002] In the production and distribution of oil and natural gas, from the wellhead to the long-distance pipeline, to the storage and transportation, and to the users of the pipeline network; similarly, in some production fields, it involves all aspects of fluid control under pressure; Open the emergency shut-off valve to ensure safety. Existing emergency cut-off valves include electric, pneumatic, hydraulic and mechanical types. Among them, the electric and pneumatic types require external power supply and power gas source respectively, and their use in places far away from the city has great limitations. The hydraulic type can work without external power and relies on hydraulic energy storage, but the disadvantage is that the act...

AI Technical Summary

Problems solved by technology

In addition, there is a huge pressure difference between the inlet pressure and the outlet pressure of the cover valve. This pressure difference can form a downward pressure on the valve cover, making the valve close more tightly; When it is opened, the huge pressure difference between the top and bottom of the valve cover makes the valve unable to open, and a bypass valve must be installed to balance the upstream and downstream pressure before it can be reopened; this also increases the production cost of the shut-off valve

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