This full-function polished rod sealer is designed for long-term operation without frequent replacement of sealing elements. It uses specially formulated cone-shaped sealing elements and a three-stage sealing structure to improve sealing reliability and service life.

During normal operation, the Stage II seal works as the main sealing component. When seal wear occurs, the fine-adjustment mechanism can be used to gradually increase sealing pressure and compensate for wear. The Stage I seal is used when replacing worn Stage II sealing elements. The Stage III seal helps prevent lubricating grease leakage and blocks sand or impurities from entering the sealing chamber, protecting both the polished rod and sealing elements.