Low-temperature lengthened stop valve capable of being completely drawn out

Abstract

The invention discloses a low-temperature lengthened stop valve capable of being completely drawn out. The low-temperature lengthened stop valve comprises a valve body, a lengthened steel pipe assembly, a valve rod and a valve deck assembly; the lengthened steel pipe assembly is fixedly arranged on the top of the valve body; the valve deck assembly is arranged on the top of the lengthened steel pipe assembly; the valve rod sequentially penetrates the valve deck assembly and the lengthened steel pipe assembly and extends into the valve body; multiple positioning supporting assemblies are arranged on the inner side of the lengthened steel pipe assembly; one end of each positioning supporting assembly abuts against the side wall of the valve rod; the lengthened steel pipe assembly is arranged between the valve deck assembly and the valve body in a sealed manner, the distance between the valve deck assembly and the valve body is increased, and therefore the low temperature of a cold box cannot influence the sealing performance of the valve deck assembly; and the positioning supporting assemblies play a role in supporting and positioning when the lengthened valve rod moves up and down, the use strength of the valve rod is guaranteed, meanwhile, the valve rod can be accurately inserted in the valve body, and mounting and demounting of the lengthened valve rod are facilitated.

Description

technical field [0001] The invention relates to the technical field of cut-off valves, and more specifically, the invention relates to a fully withdrawable low-temperature extended cut-off valve. Background technique [0002] At present, the mainstream cryogenic globe valves for cold boxes on the market usually have a long-necked bonnet structure. The long-necked bonnet structure has the function of protecting the stuffing box of the low-temperature valve, because the sealing of the stuffing box is one of the keys of the cryogenic valve. If the stuffing box leaks, it will reduce the cooling effect and cause the liquefied gas to vaporize. In the low temperature state, as the temperature decreases, the elasticity of the packing will gradually disappear, and the leak-proof performance will decrease accordingly. Due to the leakage of the medium, the packing and the valve stem will freeze, which will affect the normal operation of the valve stem and will also cause the valve stem...

AI Technical Summary

Problems solved by technology

However, this structure has the following disadvantages: first, when the temperature of the medium is low, only lengthening the distance of the neck of the bonnet cannot effectively protect the packing; second, because this kind of low-temperature valve is installed in a cold box, The bonnet and valve body connecting studs of the long-necked bonnet structure are close to the cold box and the bonnet is long, so it is inconvenient to disassemble the valve

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