Changling Refining & Chemicals has obtained a patent for a modular flushing device for easily solidifying high-temperature solvent pumps, thereby enhancing the stability and reliability of the operation of mechanical seals in such conditions

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Changling Refining & Chemical has been granted a patent for a modular flushing device for high-temperature, easily solidifying solvent pumps, which enhances the stability and reliability of the mechanical seals used in such pumps. According to information from the Intellectual Property Office, dated August 2, 2025, **Yueyang Engineering Design Co., Ltd. of Changling Refining & Chemical has obtained a patent titled “A Modular Flushing Device for High-Temperature, Easily Solidifying Solvent Pumps”; the approval number is CN223177797U, with the application date being October 2024. The patent abstract indicates that this utility model discloses a modular flushing device for high-temperature solvents with easy solidification, which includes a pump mechanical seal chamber, a Plan21 seal flushing system, a Plan21 check valve, a Plan32 seal flushing system, a flow-limiting orifice plate, a Plan32 check valve, a three-way valve, a Plan21 cooler, and a thermal insulation layer for the Plan21 flushing system ； This utility model provides a modular sealing flushing system. At the initial stage of operation, an appropriate external flushing fluid is used as the medium for flushing the mechanical seal; once operation stabilizes, the solvent medium inside the pump, after being cooled by a cooler, is used as the flushing medium. This approach ensures that the medium inside the pump remains clean and free from contamination, while also maintaining an optimal operating temperature for the mechanical seal. Moreover, the design of the heat exchanger for the flushing medium is economical and reasonable ； This improves the stability and reliability of the operation of high-temperature mechanical seals that are prone to solidification, effectively reduces energy consumption, decreases wear on the mechanical seals as well as the frequency of repairs, thereby enabling the mechanical seals to function stably and reliably over a long period of time. According to Tianyancha, Changling Refining & Chemical Yueyang Engineering Design Co., Ltd. was established in 1992 and is located in Yueyang City; it is a company that operates in the field of professional technical services. The registered capital of the enterprise is 50 million RMB. According to the big data analysis provided by Tianyancha, Changling Refining & Chemical Yueyang Engineering Design Co., Ltd. has made investments in 4 companies, participated in 747 bidding projects, and holds 120 patent records. In addition, the company possesses 15 administrative licenses.