The original condenser of the purified water system in pharmaceutical companies frequently ages and leaks due to chloride ion corrosion, affecting production safety. Our KDP company has adopted stainless steel plate condenser for renovation, designed EPDM corrosion-resistant gasket, combined with pre tightening force monitoring and sealing groove optimization. After upgrading, the leakage problem is completely solved, the service life of the gasket is extended, the condensation efficiency is significantly improved, and the risk of microbial contamination caused by leakage is eliminated. The project significantly reduces maintenance costs while ensuring continuous production, meeting the cleanliness standards of the pharmaceutical industry.