【Ten Years of Rapid Development in Chemical Processing Equipment】866-2023: China’s first large-diameter check valve with a pressure rating of 140 MPa

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Ten years of rapid development in chemical processing equipment – praise for the prosperous and strong China. This is just a starting point; more participation from everyone will make things even more lively. Haichuan becomes even better with your involvement; we welcome everyone to take part more actively in the forum discussions. ********************************************* On February 16th, the first set of large-diameter check valves with a pressure rating of 140 megapascals, developed independently by Sinopec Petroleum Machinery Co., Ltd., was used in 70 fracturing operations across 4 wells in the Sichuan-Chongqing region. The total operating time was 204 hours, during which no abnormalities were observed, and the valves received positive feedback from users. 　It is reported that this large-bore check valve features a push-in design, which enables online maintenance and simplifies installation and upkeep; the key parts are clad with weldments, giving the valve body resistance to erosion and an extended service life; the valve disc is manufactured using a rubber full-coating vulcanization process, **which improves its sealing performance and service life, enhances its resistance to scouring by sand-laden fluids, ensures reliable backpressure sealing, and allows for a maximum discharge volume of 27 cubic meters per minute – thereby supporting the safe and efficient development of unconventional energy sources. 　　Check valves are an important component of high-pressure pipelines and an essential element in large-scale fracturing operations. They prevent the backflow of fluids within the well, thereby ensuring the proper functioning of other equipment, and are widely used in fracturing operations to increase production. As shale gas development moves further into deeper strata, the pressure exerted on check valves increases. To this end, Petrochemical Machinery relies on its testing platform for high-pressure manifold products to conduct technical research on the structure, sealing methods, and manufacturing processes of check valve products, striving to develop 140 MPa large-diameter check valves in order to meet the pressure requirements for large-diameter fully flanged fracturing pipes.