The Duriron Company, Inc.

Jack L Wissman

A lined pump is provided including a casing and cover assembly forming a chamber having an inlet and an outlet. The fluid contacted surfaces of the pump are lined with PFA resin. These linings may be formed by an injection or other suitable molding process and are restrained against undesirable movement by locking plates. The locking plates may take the form of perforated metal plates attached to the pump casing and cover through which the resin flows during molding so as to become embedded in areas of the liners and lock those areas in place. Proper placement of the locking plates provides both restrained and unrestrained liner areas which permit the dissipation of built up internal stresses in the resin material due to thermal and hydraulic forces. This avoids cracking and failure while preserving the dimensional stability of the liners.

Lined corrosion resistant pump

PTFE is bonded directly to PTFE, and PTFE and related fluoropolymers are surface configured or molded, employing the differential expansion of the fluoropolymer to a confinement vessel or mold, and heating the same to fusion temperature and then cooling, creating a uniformly applied pressure on the polymer, followed by cooling while maintaining the pressure, at least during the initial cooling stages.

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Xenia, OH, United States of America

Jack L Wissman