Flat ring packing

Details Flat ring packing Flat ring packing

1999-07-19

2001-09-18

Knight, Anthony (Department: 3626)

Seal for a joint or juncture

Seal between fixed parts or static contact against...

Contact seal for a pipe, conduit, or cable

C277S609000, C277S627000, C277S654000, C285S910000, C285S917000

Reexamination Certificate

active

06290237

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a flat ring packing to be placed between two flanges and comprising two packing layers of packing material and an intermediate ring of metal which is disposed between the two packing layers and has a common central longitudinal axis therewith.
2. Background Art
Flat ring packings of the generic type are used for instance in pharmaceutical and foodstuff industry. In this case, a prerequisite resides in that the flanged joints do not exhibit any so-called wake spaces, i.e. spaces of poor flow. This is why the flat ring packings on the one hand and the pipes and apparatuses which the flanges are mounted on are to have identical inside diameters.
In known flat ring packings provision is made for an intermediate ring which is inserted into a sleeve of packing material. This one-piece sleeve forms packing layers which are joined to each other undivided in the radially inner area. In this case, radial play and also axial play must be available between the intermediate ring and the sleeve which comprises the packing layers in order that any tearing of buckling of this sleeve during assembly be avoided. It is difficult to center the sleeve of packing material and the intermediate ring of metal between the to-be-connected flanges in such a way that no wake spaces will form relative to the pipes.
SUMMARY OF THE INVENTION
It is an object of the invention to embody a flat ring packing of the generic type such that the packing layers and the intermediate ring are accurately centered relative to each other.
According to the invention, this object is attained in that each packing layer is fixed on the intermediate ring substantially without play radial and parallel to the axis by means of a connection. This design helps achieve that any displacement of the packing layers relative to the intermediate ring in the radial direction is precluded. In this way no wake spaces can form on the flanged joints. The layers can be mounted in the way of a snap connection on the intermediate ring and can again be released therefrom and replaced by fresh ones. The kind of connection of the packing layers to the intermediate ring ensures that there are no materials such as glue which might be passed on to the media flowing in the pipes. The flat ring packing consists exclusively of the two packing layers and the intermediate ring.
Numerous advantageous embodiments will become apparent from the ensuing description of an exemplary embodiment, taken in conjunction with the drawing.


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patent: 5823542 (1998-10-01), Owen
patent: 6089618 (2000-07-01), Cook

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