High Integrity Sealing Requirements
Trelleborg Sealing Solutions recommend the Multi-Contact Turcon® Variseal® when operational conditions require a subsea ball valve stem seal to perform with high resistance to chemical media, and under extreme temperatures whilst maintaining good extrusion or compression characteristics.
The Multi-Contact Turcon® Variseal® has been developed to replace multiple chevron seals or V-stack type products in subsea valve stems requiring a high-integrity sealing capability. It includes a series of single-acting spring-energized seals housed within a U-shaped Turcon® PTFE based material seal profile.
The unique single-piece design significantly improves sealing integrity and leak tightness in high-pressure applications by providing higher contact force across multiple seal hardware interfaces. It has been designed to provide integrated redundancy, helping to extend the flex life of seals in high-pressure applications while providing better performance and lower operator costs. With the addition of PEEK anti-extrusion devices, the Multi-Contact Turcon® Variseal® can withstand pressures of up to 207 MPa/ 30,000 psi.