Underwater flat gate valve for sea bottom christmas tree

Abstract

The invention relates to an underwater flat gate valve for a sea bottom christmas tree. The underwater flat gate valve comprises a valve body, a valve cover, a gate plate, a support and a valve seat.A first sealing structure is arranged between the valve body and the valve cover. A second sealing structure is arranged between the valve seat and the valve body. A third sealing structure is arranged between the valve cover and a valve rod. A gasket ring and a valve rod nut are mounted in the support, and the valve rod stretches out of the valve cover to penetrate the gasket ring to be in threaded connection with the valve rod nut. The upper end of the valve rod nut is connected with a drive sleeve, the drive sleeve is connected with an upper valve rod, and the upper valve rod is connected with a valve position indication mechanism. The upper valve rod is connected with an ROV connector through a supporting bearing. A pre-pressing disc spring for providing initial specific pressure is mounted on the valve seat. A pressure relief channel extending in the upstream direction is arranged in the valve body, and a one-way pressure relief valve is mounted on an inner channel of a valve cavity of the valve body. A gate plate guide mechanism is detachably mounted at the symmetric positions of the middle of the valve seat. The underwater flat gate valve has the advantages that sealing performance is good, and the functions of gate plate guide and start and stop compensation are achieved; and meanwhile, for gate plate and valve seat hardening treatment, the corrosion resisting strengthis improved, corrosion resistance is high, and the service life is long.

Description

Technical field [0001] The invention belongs to the technical field of underwater valves, and particularly relates to an underwater flat gate valve for submarine Christmas trees. Background technique [0002] After the development of oil and gas resources shifted from land to the 1980s, key underwater equipment such as subsea cluster wellheads, dry and wet Christmas trees, multi-well manifolds, and subsea metering devices were developed. Underwater pressurization and subsea oil and gas Innovative technologies such as processing have gradually entered the stage of field testing and industrial application. The operating depth of underwater remote control robots is up to 4 000m. The development mode of underwater oil and gas fields is becoming more and more abundant. The records of application water depth and the connection distance of underwater oil and gas fields are quickly refreshed. There are many successful cases ranging from water depths of several meters to thousands of mete...

AI Technical Summary

Problems solved by technology

[0006] (3) For deep sea underwater production technology, the deep sea gate valve can only be controlled by remote operation or ROV, so the deep sea gate valve must be integrated with the driving device;

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