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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.
Our design ensures that the seal contacts the seat ring only at the final stage of closing and there is no rubbing / skidding thereby precluding any galling and wear. The resiliency of the disc seal ensures that it adjusts to the seat ring surface thereby developing uniform compressive force between the seating surfaces. This guarantees perfect bubble-tight sealing contact. not only during normal operating conditions but also during thermal cycling. |
