LNG butterfly valve

Abstract

The invention relates to a -162 DEG C LNG butterfly valve. In order to embody the characteristics that the LNG butterfly valve is communicated in two directions and has a safety function, a butterfly plate is axially provided with two pressure adjustment valves which are respectively communicated in a single direction, the pressure adjustment valves can be set according to specific requirements of LNG pipeline flow paths together with control pressure of each pressure adjustment valve, the two portions, on the two sides of a pipeline, of the LNG butterfly valve can be automatically communicated in two directions, pressure balance of the two sides of the valve is effectively controlled, backflow control is easy, and both opening and closing and safety control can be achieved. Meanwhile, due to the adoption of the technology that a telescopic elastic valve rod provided with a prestressed spring is adopted, the all-welded ball valve technology of the labyrinth seal technology and the like, valve design pressure 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 butterfly valve. According to the characteristics of one-way sealing and large flow control of the LNG butterfly valve, two one-way pressure regulating valves are arranged in the axial direction at the butterfly plate, which can be used according to the specific requirements of the LNG pipeline process. , to set and adjust the respective control pressure, can effectively control the pressure balance on both sides of the valve, easy to control the reverse flow, and play a role in pipeline safety. 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 reduce the height of the overall valve stem, reduce the overall size of the LNG butterfly valve, and has the dual functions of LNG two-way cut...

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 butterfly 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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