Elliptical sealing surface for butterfly valve

Details Elliptical sealing surface for butterfly valve Elliptical sealing surface for butterfly valve

2006-07-25

2006-07-25

Keasel, Eric (Department: 3754)

Valves and valve actuation

With means to increase head and seat contact pressure

Seat pressed to valve

C251S307000

Reexamination Certificate

active

07080820

ABSTRACT:
A reduced component wear valve is comprised of a valve body having a passage therethrough and a disc attached to a rotatable shaft. The disc is utilized with a seal forming a gap between the disc and the seal proximate to the rotational axis of the disc. When the disc is in the open position, the seal major axis is greater then the disc diameter and they do not touch. As the disc rotates to near closure, the disc perimeter engages the minor axis of the seal (which is smaller than the disc diameter), and the disc stretches the seal in the minor axis direction thus decreasing the major axis such that the gap is closed. The seal can be pre-formed in an elliptical shape or it can be formed into an elliptical shape by a retaining mechanism. The seal may be a single-piece or a multi-piece assembly press-fit into the valve body. Zero or light disc to seal contact during the majority of the valve disc rotation minimizes valve seal wear and rotational friction.

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