Mixed sealing type top-mounted low-temperature ball valve

Abstract

The invention discloses a mixed sealing type top-mounted low-temperature ball valve, and belongs to the field of ball valves. According to the mixed sealing type top-mounted low-temperature ball valve, gas enters the interior of an elastic air bag through a first through hole and a second through hole, so that the elastic air bag is continuously expanded, the expanded elastic air bag continuously pushes a thorn cone to press downwards, thereby compressing an aqueous solution storage balloon and a quicklime storage balloon; an inner cavity of the elastic air bag is continuously filled with gas, so that the elastic air bag is continuously expanded, and finally, the water solution storage balloon and the quick lime storage balloon are crushed by the thorn cone one by one, so that the water solution and the quick lime fully react in an inner cavity of a reaction cavity, and a deformation memory metal ring deforms due to the heat, and the deformed deformation memory metal ring is matched with a valve rod to extrude a rubber filler, so that the sealing performance of the joint of the valve rod and the rubber filler is improved, gas leakage can be temporarily prevented in time, and sufficient time is provided for personnel maintenance.

Description

technical field [0001] The invention relates to the field of ball valves, in particular to a hybrid sealing top-mounted cryogenic ball valve. Background technique [0002] The ball valve is mainly used to cut off, distribute and change the flow direction of the medium in the pipeline. It only needs to be rotated 90 degrees and a small rotational torque can be closed tightly. Ball valves are most suitable for on-off and shut-off valves, V-type ball valves. In addition to paying attention to the pipeline parameters, the electric valve should also pay special attention to the environmental conditions of its use. Since the electric device in the electric valve is an electromechanical device, its use status is greatly affected by its use environment. Under normal conditions, special attention should be paid to the use of electric ball valves and butterfly valves in the following environments. In my country, ball valves are widely used in petroleum refining, long-distance pipelin...

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Problems solved by technology

[0003] Some existing cryogenic ball valves are generally used for gas transportation. The valve stem and sealing packing, as well as the valve ball and the rubber sealing ring inside the pipeline, will rub against each other for a long time, which will easily lead to wear on the surface of the rubber sealing ring and sealing packing. And when the sealing packing is worn, the gas is prone to leakage. When the traditional cryogenic ball valve encounters the phenomenon of gas leakage, it is not convenient to seal the leak, it is not convenient to stop the gas leakage in time, and it is not convenient to remind in time. The staff is overhauling

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