A copper alloy five-leaf check valve with flange joints

Abstract

The invention relates to a special valve for an offshore oil drilling platform, and particularly to a copper alloy five-connecting-rib check valve of a flange connector. The check valve comprises a lower flange head hemisphere casing, an upper flange head hemisphere casing, a cylindrical pipe and a variable flow cavity valve core, wherein four sets of valve casing bolts and nuts are sealed, positioned and fixed between a lower four-lug on the lower flange head hemisphere casing and an upper four-lug on the upper flange head hemisphere casing, a deformed flow channel passes through the space between a valve core annular hole in the lower spherical surface of the valve core and a valve core circular hole in the upper spherical surface of the valve core, and five diversion supporting plates are arranged on the deformed flow channel; the inner side surfaces of the five diversion supporting plates are fixedly connected with the valve core cavity wall of the variable flow cavity valve core, and the outer side surfaces of the five diversion supporting plates are fixedly connected with the excircle inner side wall of the variable flow cavity valve core; the deformed flow channel gradually changes into the valve core circular hole in the upper spherical surface of the valve core from the valve core annular hole in the lower spherical surface of the valve core so as to ensure that the variable flow cavity valve core moves up and down relative to the cylindrical pipe and can do unidirectional circulation at the same time.

Description

technical field [0001] The invention relates to a special valve for an offshore oil drilling platform, in particular to a flange joint copper alloy five-leaf rib check valve without any obstructing parts such as springs. Background technique [0002] Following the discovery of a large oil field in Venezuela in 1920 by using a wooden platform to drill wells in Lake Maracaibo, the Soviet Union successfully conducted offshore drilling with a trestle near the Baku oil field in the Caspian Sea in 1922. After 1936, the United States began to drill the first deep well in the Gulf of Mexico. In 1938, the world's earliest offshore oil field was built. From the 1940s to the 1960s, with the development of welding technology and the steel industry, drilling devices such as steel fixed platforms, sitting-bottom platforms, and jack-up platforms appeared one after another, expanding offshore oil and gas exploration to sea areas with a water depth of 30 meters. In 1950, a mobile offshore d...

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Problems solved by technology

[0003] As we all know, the cost of each maintenance of the offshore oil drilling platform system is astonishing. Seawater itself contains various corrosive compounds. During the use of offshore oil drilling platforms, crude oil contains various corrosive compounds. Generally, oil well production fluid contains water and other corrosive media. The water in crude oil vaporizes with the crude oil during the heating process, which increases the gas phase load of the pipeline, causing fluctuations in the operation of atmospheric and vacuum devices, and in severe cases, tower flushing accidents.

MgC12 and CaC12 in crude oil can be hydrolyzed to produce corrosive HCl, and HCl dissolves in water to form hydrochloric acid, which has a strong corrosive effect and causes corrosion of the pipeline system

After the crude oil is produced from the oil well, it is transported outward through the oil pipeline. Any repair or replacement of the oil circuit and the cleaning of the blocked pipeline will cost a lot, and will affect the production of the oil well for a long time.

[0004] Any component in the offshore oil drilling platform system must be able to withstand seawater corrosion. It is essential to use a check valve in the pipeline of the offshore oil drilling platform system to complete the entire delivery process. The currently used check valve, Such as: steel ball type, valve type and gravity type, the main disadvantage is: the internal spring causes a large resistance loss

The self-priming pump and other supporting one-way valves also have to overcome the gravity resistance in the whole process, resulting in additional energy consumption

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