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SPI-DRY™ Critical Point Dryers

Securing the bonded door seals into the SPI-Dry Regular and Jumbo units doors


These instructions describe a simple way to prevent the bonded door seal from falling out of its recess while the SPI-Dry™ Regular or SPI-Dry™ Jumbo critical point dryer door is being screwed into place. Bonded seals consist of an outer metal ring with a nitrile or EPDM component bonded to its inner face. Bonded seals (sometimes referred to as "Dowty seals") normally push fit into the recess in the Regular and Jumbo door. However, sometimes the fit is not exact and therefore when the door is positioned next to the CPD chamber the bonded seal can fall forward, making closure difficult.

Bonded door seals for SPI-Dry CPD units:
Regular (left) and Jumbo (right)


The solution is to very slightly deform the metal part of the seal so that it will then push-fit into the CPD door recess. The best way to do this is to grip the seal in a workshop clamping vice (across the circumference of the seal) and slightly deform the seal so that it push fits into the recess in the CPD door. Always remember that since bonded seals work by expanding sideways, a small amount of deformation will not effect the sealing characteristics of the seal.

Note: All new SPI-Dry critical point dryers are fitted with seals that have been carefully adjusted to be a push fit.


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Sunday October 12, 2008
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