An ultra-low temperature butterfly valve that is convenient for online maintenance

Abstract

The invention discloses an ultra-low temperature butterfly valve which is convenient for on-line maintenance, specifically relates to the technical field of ultra-low temperature butterfly valves, comprising a valve body, the valve body is rotatably connected with a valve stem, the outer wall of the lower part of the valve stem is fixedly sleeved with a valve, and the valve body A sealing ring groove is opened in the lower part, a movable sealing assembly is installed in the valve, and a packing assembly is installed in the lower part of the valve stem. The present invention can push the elastic rubber ring to extend or shrink inward and slide and engage or separate from the sealing ring groove through the setting of the movable sealing component, so as to facilitate the sealing or opening of the valve and the sealing ring groove, prevent the valve from jamming, strong sealing performance, and automation High degree, easy disassembly, low safety, low maintenance difficulty, through the setting of packing components, the opening and closing of the door can be controlled, which is convenient for the taking and sealing of multi-piece PTFE packing, and facilitates the maintenance and replacement of butterfly valves. It increases the reliability of the valve, prevents the leakage of packing, has strong safety and high practicability.

Description

technical field [0001] The embodiment of the present invention relates to the technical field of ultra-low temperature butterfly valves, in particular to an ultra-low temperature butterfly valve that is convenient for online maintenance. Background technique [0002] With the development of the economy, the requirements for the level of industrial automation control are constantly increasing, and the working conditions faced by the valves are also more complicated and harsh. For example, if there is hydrogen and oxygen leakage in the air separation equipment, it may cause an explosion and cause a major disaster. This puts forward higher requirements on the sealing performance and reliability of the valve stem under ultra-low temperature conditions. [0003] Most of the existing side-mounted ball valve bodies are left and right two-piece or three-piece structures. There are gaskets between the left and right valve bodies and bolts are pre-tightened to seal. However, the seali...

AI Technical Summary

Problems solved by technology

[0005] For this reason, the embodiment of the present invention provides an ultra-low temperature butterfly valve that is convenient for online maintenance. Through the setting of the movable sealing assembly, the elastic rubber ring can be pushed out or retracted to slide and engage or separate from the groove of the sealing ring, so that the valve and the sealing ring can be easily connected. The groove is sealed or opened to prevent valve jamming, strong sealing, high degree of automation, easy disassembly, low safety, and low maintenance difficulty. Through the setting of the packing component, under the limit action of the rotating shaft, connecting rod and tension spring, The opening and closing door can be rotated and opened, and under the action of the elastic force of the return spring, the cartridge rises to seal the opening and closing door with the valve stem again. and sealing, which facilitates the maintenance and replacement of the butterfly valve, increases the reliability of the valve, prevents the leakage of the packing, has strong safety and high practicability, and solves the problem of pre-installation between the valve body with gaskets and bolts in the prior art. Tight seal, easy to be affected by pipeline stress and leakage, lock the ball, block the valve, complex maintenance operation, low safety, difficult maintenance, difficult to take out the multi-piece PTFE packing from the stuffing box, causing serious damage to maintenance and replacement work It is very inconvenient, the reliability of the valve is low, it is easy to cause the leakage of flammable medium, and the problem of poor safety

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