Mathematical modeling of the interference of seal pair in triple-offset butterfly valve

Avoiding interference of seal pair in triple-offset butterfly valve is critical to its performance and service time. In this article, a mathematical model is proposed for the seal interface. A formula is derived to evaluate the interference of seal pair in triple-offset butterfly valve. Five parameters are considered, including the diameter of valve disc, the effective sealing thickness, axial offset, radial offset, and eccentric angle. The influences of axial offset, radial offset, and eccentric angle on the interference area and position are investigated. The results show that the interference area decreases initially and increases finally when either the axial offset or the eccentric angle increases, whereas it decreases monotonously as the radial offset increases.