The valves are available in sizes DN50 – DN2200 (2“ – 88“) and pressure classes PN10 – PN250 (Class 150 – Class 1500).4
TRI-CON valves offer the widest laminated seal ring in the market today, made possible by true cone-in-cone seating design. This wide lamination of stainless steel and graphite provides a flexible sealing surface when it is seated against line scale or particulates. The multiple layer lamination enables a maximum sealing performance.³
Zwick’s TRI-CON valve is characterized by a self-centering disc that is keyed to the shaft, not pinned. Other triple-offset valve manufacturers permanently pin or affix their discs to the shaft.
To accommodate for differential thermal expansion of the shaft and the disc, other manufacturers must rely on a seal ring that compresses radially. This makes their designs subject to jamming due to thermal expansion.
3 Leckrate A – C for DIN EN 12266-1 or Zero Leakage for API 598
4 The given pressure class is relevant for the casing and flanges, the maximum allowable differential pressure for the internals on request.
