Compared to a concentric valve, there are three eccentricities in this product which offers various benefits compared to a traditional valve. The first eccentricity (seal ring offset from the shaft centre line) ensures that the seal and seat ring is in one piece without shaft interruption. The second eccentricity (shaft offset from pipe centre line) gives the non-symmetric trim design. This is useful for higher safety integrity applications where fail to open/close features can be used to assist required fail safe position with correct installation of valve to flow / high pressure direction. It also ensures that the seal does not contact the seat ring at full open position. The third eccentricity (seat and seal cone centre lines being inclined to pipe centre line) completely eliminates rubbing between seat and seal throughout 90° rotation.