Corner Configurations

As a general rule Pneuma-Seal, molded or extruded, is flexible enough in a radial seal application (Fig. 1) to conform to a corner radius of between four and eight times its relaxed height, depending on the specific profile. However, the expansion in these corners will always be at least partially restricted unless the radius is even more liberal than this. The effect is more severe when the seal is positioned for radial expansion inward than when positioned for radial expansion outward. Therefore, when the designer has a choice, the latter location is preferable.

Square right angle corners are not available for seals which expand radially inward or radially outward. However, if the requirement is to seal a rectangular opening with a radially outward expanding seal, a special design can be furnished. In axially expanding (face) applications, corners of rectangular non-reinforced Pneuma-Seal (Fig.2) can be preformed to minimum centerline radii approximately twice the cross section width. (Consult Pawling for exact dimensions.)

When using molded fabric-reinforced Pneuma-Seal, designers are cautioned to consult with Pawling to avail themselves of existing corner molds.

Square right angle corners (Fig. 3) can be furnished for some axially expanding (face) applications. However, the working "gap" may, in some cases, be reduced from the figures shown on this site. (Consult Pawling for specifics.)