Tricentric butterfly valve

MST offers thetricentric butterfly valve, a premier isolation valve well-suited for operation in light vacuum to high-pressure applications and ideally suited for applications requiring absolute zero leakage. Compared to gate, globe or ball valves of the same size and pressure class, Tricentric butterfly valve provides space and weight savings while minimizing installation and maintenance costs.

Tricentric butterfly valve, non-rubbing, metal-to-metal seal delivers zero leakage with minimal torque and is certified fire-safe. The resiliency of the seal ring ensures uniform peripheral sealing with the seat, achieving full shutoff regardless of flow direction. Tricentric butterfly valve offers a solid metal seal ring for high-temperature and severe service applications to ensure bi-directional shutoff throughout the full pressure/temperature range.

Tricentric butterfly valve features a stem that is offset on both the X (1) and Y (2) axis of the butterfly valves center-line. This produces a cam-like motion as the valve operates. The third offset (3) consists of an inclined conical profile machined into the valve sealing surface, allowing rotary engagement and disengagement of the seat and seal ring without interference. This triple offset eliminates all rubbing between the seat and seal ring during valve travel, reducing seat and seal wear and extending cycle life.

Once the seat and seal ring are fully engaged, torque is applied in order to create a bi-directional, zero leak, metal-to-metal seal. For this reason, Tricentric butterfly valve is often defined as "torque-seated" rather than "position-seated" as in the case of resilient or high-performance products.