Emergency cut-off valve at bottom of built-in tank in low-temperature liquid storage tank

Abstract

Disclosed is an emergency cut-off valve of at the bottom of a built-in tank in a low-temperature liquid storage tank. The emergency cut-off valve mainly comprises a main valve portion and a driving portion, the main valve portion is welded to the bottom of the low-temperature liquid storage tank through a bottom plate; the driving portion is placed at the top of the low-temperature liquid storage tank, and the main valve portion and the driving portion are connected through two stainless steel ropes, wherein one rope is a work rope, and the other rope is an emergency rope; a valve seat is fixed on the bottom plate of the main valve portion and connected with a guide frame, and a large valve clack which is capable of vertically moving and is matched with the valve seat to form a large sealing pair is built in the guide frame; and a small valve clack which is capable of vertically moving and is matched with a centre valve hole of the large valve clack to form a small sealing pair is arranged above the large valve clack through a valve rod. Compared with ordinary emergency cut-off valves, the emergency cut-off valve is small in executing mechanism, reasonable and compact in structure and good in using effects.

Description

technical field [0001] The invention relates to an emergency shut-off valve with a built-in tank bottom in a low-temperature liquid storage tank, which belongs to low-temperature mechanical equipment. Background technique [0002] In the event of emergency leakage of large cryogenic liquid storage tank pipelines, if there is no emergency shutdown measure, a large amount of liquid will leak out, which will easily lead to safety accidents. The current practice in the industry is to add an emergency cut-off valve to the output pipeline. The disadvantage of this is: if the pipeline fails, the valve will be cut off, and part of the liquid will remain between the storage tank and the cut-off valve, which will increase the cold loss and have safety hazards. hidden danger; moreover, if it is torn between the shut-off valve and the storage tank, it is impossible to effectively cut off the leakage of liquid urgently. Contents of the invention [0003] The purpose of the present...

AI Technical Summary

Problems solved by technology

[0002] In the event of emergency leakage of large cryogenic liquid storage tank pipelines, if there is no emergency shutdown measure, a large amount of liquid will leak out, which may easily lead to safety accidents

The current practice in the industry is to add an emergency cut-off valve to the output pipeline. The disadvantage of this is: if the pipeline fails, the valve will be cut off, and part of the liquid will remain between the storage tank and the cut-off valve, which will increase the cold loss and have safety hazards. hidden dangers; moreover, if the rupture occurs between the shut-off valve and the storage tank, it is impossible to effectively cut off the liquid leakage urgently

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