The 24th China International Petroleum and Petrochemical Technology and Equipment Exhibition

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.