LNG brake valve

Abstract

The invention relates to a -162 DEG C LNG brake valve. According to the characteristic that the LNG brake valve needs two-way sealing and two-way brake, four one-way connecting pressure adjusting valves are arranged along the axis of a wedge disc, control pressure of the pressure adjusting valves can be set and adjusted respectively according to the specific requirement for the LNG pipeline process, LNG in a dead zone can be automatically guided out in a two-way mode, pressure of the two sides of the valves can be effectively controlled to be balanced, counter flow control is facilitated, and the safety functions of two-way brake, two-way sealing and two-way connecting of LNG are achieved. Meanwhile, by the adoption of the technology of retractable elastic valve rods provided with prestress springs, the labyrinth sealing technology, the multi-sealing all-welded valve technology and the like, design pressure of the valve and design pressure of an LNG conveying system can be effectively reduced, the size of the valve is smaller, safety is higher, and machining and manufacturing cost is lower.

Description

technical field [0001] The invention relates to a -162°C LNG gate valve. According to the characteristics of the LNG gate valve requiring two-way sealing and two-way gate stop, four unidirectional pressure regulating valves are arranged along the shaft at the gate plate. According to the specific requirements of the LNG pipeline process, Setting and adjusting the respective control pressures can automatically lead out the LNG in the blind area in two directions, and effectively control the pressure balance on both sides of the valve, which is easy to control the reverse flow, and can achieve the functions of two-way gate stop, two-way sealing, and two-way conduction of LNG. Security utility. At the same time, it adopts shrinkable elastic valve stem technology with prestressed spring, labyrinth sealing technology and fully welded valve technology with multiple seals. Prestressing is required to prevent leakage caused by temperature difference and strain. It can effectively re...

AI Technical Summary

Problems solved by technology

[0003] According to the characteristics of low-temperature transportation of LNG at -162°C, the present invention invents the LNG gate valve, which is used to solve the traditional problems of bidirectional sealing, bidirectional conduction, sealing leakage, difficult safety control, large volume, and poor design when transporting LNG. Problems such as bulkiness and too long valve stem can improve the control efficiency of the LNG process in the pipeline, reduce the design pressure of the system, reduce the volume of the valve, and improve the safety of the LNG system, etc.

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