Novel ultralow temperature stop valve and operation method thereof

Abstract

The invention discloses a novel ultralow temperature stop valve and an operation method thereof, mainly solving the problems in the prior art that the leakage of a filling material is easily caused bythe long-term immersion of the filling material in ultralow temperature liquid; an ultralow temperature resisting temperature is relatively expensive; a low-temperature stop valve has a relatively poor airtight stability on a dynamic device; and the high moment closing easily causes the damage of a sealing surface. The novel ultralow temperature stop valve comprises a valve body, a valve rod anda hand wheel, wherein a valve cover assembly is arranged on the valve body; the valve rod is screwed into the valve cover assembly through a thread and is matched with the valve cover assembly; a valve cover conical surface is arranged at the lower end of a part, being in threaded connection with the valve rod ,of the valve cover assembly; and the hand wheel is fixedly connected to the valve rod through a hand wheel nut and an elastic washer. According to the technical scheme, when the valve is opened, the valve cover is reversely sealed to prevent the filling material from being leaked; the cost is greatly reduced; the micro-leakage and automatic opening are avoided on the dynamic device; meanwhile, the closing moment is reduced by 50%; and the service life of a sealing gasket is prolonged. The novel ultralow temperature stop valve is suitable for LNG, LO2, LN2, LAr and ultralow temperature pipelines and operation equipment.

Description

technical field [0001] The invention relates to the field of valves, in particular to a novel ultra-low temperature cut-off valve and an operating method thereof. Background technique [0002] The ultra-low temperature globe valve is a cut-off device used in low temperature conditions. The low temperature industry with a general working temperature below -100°C occupies an important position in the industrial field. The ultra-low temperature globe valve is suitable for LNG, LO2, LN2, LAr, ultra-low temperature pipelines and operating equipment, and various pipelines of Class150~Class900, PN16~PN150, and is used to cut off or connect the medium in the pipeline. The driving mode of the ultra-low temperature globe valve is manual, gear transmission, pneumatic or electric. Cryogenic globe valves generally adopt flange connection, but also can use butt welding connection. [0003] The ultra-low temperature globe valve has the characteristics of compact structure, reasonable des...

AI Technical Summary

Problems solved by technology

[0004] In the ultra-low temperature cut-off in the prior art, its filler is immersed in the ultra-low temperature liquid for a long time, which is easy to cause leakage; the filler is generally made of ultra-low temperature resistant material, which is relatively expensive and has high cost; the general low-temperature cut-off valve is on the dynamic device, and the airtight stability is high. Poor, high torque closing is easy to cause damage to the sealing surface, which can easily reduce the life of the gasket and affect the service life

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