The mechanical seal industry’s development direction for the 15th Five-Year Plan period has been clarified, and an industry event was held in Xiamen.

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4th January 2026

On December 19, 2025, the Third Meeting of the First Session of the Mechanical Seals Professional Branch of the China Hydraulic Pneumatic Seals Industry Association was held in Xiamen, Fujian Province. The meeting, themed “Anchoring Goals for Development, Striving Forward to Open a New Chapter,” outlined the blueprint for the industry’s “15th Five-Year Plan.”

Academician Wang Yuming of the Chinese Academy of Engineering, Chairman Du Xudong of the Association, and Branch President Li Kun, along with other industry leaders and experts, attended the meeting. Chairman Wang Liming of Kunshan Xinyoumi Mechanical Seals Technology Co., Ltd. was also invited to participate. Chairman Du Xudong highly praised the branch’s achievements, recognizing its role in building consensus and contributing to the high-quality development of the industry.

The meeting was chaired by Wu Zhaoshan, Secretary-General of the branch. Li Xiang, Deputy Secretary-General, summarized the industry’s work in 2025, clarifying key tasks such as tackling core technology challenges and the domestic substitution of high-end products. President Li Kun released a report on the development direction for the 15th Five-Year Plan, proposing a development theme of “high-end, intelligent, green, and international.” Secretary-General Wu Zhaoshan interpreted the guiding role of standards and publicized the newly released standards for 2025.

In addition, three industry experts shared their cutting-edge insights on high-end equipment sealing technology, high-quality graphite materials, and silicon carbide ceramic sealing materials.

The conference attracted more than 320 representatives from over 240 organizations, building industry consensus and injecting new momentum into the high-quality development of the mechanical seal industry.

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Frequently Asked Questions

- Static sealing surface leakage: Check if the stationary ring seals (O-rings, V-rings) are aged, deformed, or missized. Replace with seals of the same specifications that are resistant to the medium and temperature. If the clearance between the stationary ring and the gland is too large, the stationary ring needs to be re-machined or replaced.
- Dynamic sealing surface leakage: Check if the sealing end faces of the dynamic and stationary rings have scratches, wear, or chipping. Minor scratches can be repaired by grinding; for severe scratches, replace the sealing ring directly. Also, confirm if the spring compression is appropriate. If insufficient compression, add gaskets; if excessive compression, reduce the number of gaskets.
- Leakage at the bushing-shaft mating point: Check if the bushing seal is damaged or if the clearance between the bushing and the shaft is too large. Replace the seal or re-grind the bushing.

- Excessive end face wear: If caused by particulate impurities in the medium, a filter needs to be installed; if caused by insufficient lubrication, a self-lubricating seal such as an impregnated graphite ring can be used, or an external flushing fluid (such as a clean liquid of the same medium) can be introduced.
- Shaft sleeve wear: Replace the shaft sleeve with one made of wear-resistant material, and adjust the coaxiality of the sealing cavity and the shaft to avoid uneven wear.

- Overheating of the sealing cavity: Check for blockages in the cooling system and clean the cooling pipes. If the medium temperature itself is too high, use high-temperature resistant sealing materials (such as silicon nitride ceramic rings or fluororubber sealing rings).
- Poor end-face contact due to spring failure: Replace fatigued or corroded springs with corrosion-resistant spring materials such as stainless steel, and ensure uniform spring compression.

- Coaxiality deviation: Recalibrate the coaxiality of the pump shaft and motor shaft, and adjust the radial runout of the sealing cavity and shaft to within the allowable range.
- Loose parts: Check whether the gland bolts and drive pins are loose. Tighten the bolts evenly to the specified torque, and replace worn drive pins.

- Material incompatibility with the medium: Replace the sealing material according to the characteristics of the medium (e.g., Hastelloy or PTFE for corrosive media; silicon carbide for high-temperature media).
- Improper installation: Strictly follow the installation specifications to avoid impact or scratches on the sealing surface and ensure that no impurities enter the sealing cavity during installation.

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3. The mill-type and mechanical seal designs share a common platform. Simple conversion is achieved by simply changing the friction pair. The design already considers FDA and GMP standards, requiring no structural modifications.

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The mechanical seal industry’s development direction for the 15th Five-Year Plan period has been clarified, and an industry event was held in Xiamen.

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