Cryogenic ball valves have a larger flow diameter than similar gate valves. These valves allow for faster opening and closing, making them suitable for applications requiring zero leakage, such as storage tanks, cryogenic pumps, pipelines, or low-pressure trailers. Cryogenic ball valves are widely used in hydraulic, gas, ethylene, and chemical equipment.

This article introduces a new type of cryogenic online disassembly and maintenance ball valve that is different from the existing top mounted ball valve. To address the practical needs of online disassembly, a new solution is proposed. The commonly used cryogenic top mounted ball valves at home and abroad can only be replaced online if there is leakage during use. The replacement process is very cumbersome and the overall sealing performance of the valve after replacement cannot be verified on the spot. It can only be confirmed when the pipeline is restarted. The ball valve introduced in this article that can be disassembled and repaired online has optimized its structure, reduced processing difficulty, and saved costs. The finished product is not only more convenient for online maintenance, but also allows for on-site testing of its sealing performance after replacement of spare parts, saving more time for pipeline shutdown and maintenance. At the same time, the difficulty of operation during maintenance is lower, which can perfectly solve the current problem of difficult disassembly and repair of top mounted ball valves.

Abstract: This paper introduces an ultra-low temperature valve test device. The test device has the dual functions of low-temperature test liquid medium recovery and helium gas pressurization recovery for leak detection, so that the test liquid medium and gas medium can be recycled, energy saving and environmental protection, and the test cost is greatly reduced.

A plug valve is a shut-off component—it opens and closes by rotating the valve disc 90 degrees around the valve body's centerline, used to cut off, distribute, and change the flow direction of media in pipelines. The working principle of a plug valve is to regulate and cut off fluid flow by rotating the valve disc to change the size and direction of the valve disc passage. Its main functions include flow regulation, fluid cut-off, wide applicability, good sealing performance, and simple structure.

Check valve refers to a valve whose opening and closing part is a round disc and acts by its own weight and medium pressure to block the backflow of the medium, which belongs to the automatic valve.The motion mode of the valve disc is divided into lifting type and swinging type.Lift Check Valve is similar with globe valve, only the stem that drives the disc is missing.

A butterfly valve is a type of valve whose closing part (valve disc) is a disc that rotates around the valve stem to open and close. It is mainly used for pipeline shut-off and throttling. The disc is driven by the valve stem, and a 90°rotation completes one opening and closing cycle. By changing the deflection angle of the disc, the flow rate of the medium can be controlled. Common butterfly valves include wafer-type butterfly valves, lug-type butterfly valves, and flange-type butterfly valves. Butterfly valves are suitable for engineering systems that transport various corrosive and non-corrosive fluid media, such as generators, coal gas, natural gas, liquefied petroleum gas, city gas, hot and cold air, chemical smelting, power generation, environmental protection, and building water supply and drainage systems. They are used to regulate and shut off the flow rate of media.