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Features of the programmable valves in the continent’s largest pressure swing adsorption carbon removal unit: (1) A special anti-scouring design is employed in the valve core structure, which effectively extends the service life of the valve； ⑵ It features sealing using a soft, special material in the valve core structure, providing highly reliable internal sealing performance ； ⑶ The stuffing box features a radially and axially self-compensating, self-tightening sealing structure, while the valve stem is manufactured using an electroplated nickel-chromium alloy process to minimize the friction coefficient, thereby ensuring high reliability in terms of external sealing performance ； ⑷ Programmable valves are driven by hydraulic pressure, offering high driving force, a small valve size, and fast switching speed. It can be used in devices with an operating pressure of 6.4 MPa or higher ； For pressure swing adsorption urea decarburization units, it is required that the carbon dioxide content in the purified gas be less than 0.2%, and that the purity of carbon dioxide extracted by the vacuum pump be greater than or equal to 98.5%. Therefore, the requirements for internal and external leakage in programmable valves are much higher than those in other pressure swing adsorption systems (such as pressure swing adsorption hydrogen production systems, conventional pressure swing adsorption decarburization systems, pressure swing adsorption oxygen enrichment systems, etc.).