Corrosion resistant valve construction
AssigneeDresser Industries, Inc.
InventorsThomas F. Rothwell, Gerald B. Smith
Life of this patent
Estimating the term…
Abstract
A valve, such as a butterfly valve having an offset closure vane and stub shafts for operating the vane in the flow passage of the body, has all exposed and/or potentially vulnerable metal surfaces encapsulated in a corrosion-resistant polymeric plastic coating. Providing bearing support for the vane drive shaft are a pair of spaced apart journal bearings located in the shaft bore in a shrink fit relation to the coating thereat.
Claims5
In a pipe line valve for corrosive service including a metal body defining a flow passage between an inlet and an outlet, a closure member in said passage operable between open and closed positions thereof, an operator shaft extending from a driving connection with said closure member to a location external of said body, means defining at least one bore through a wall of said body for accommodating said operator shaft, and a corrosion resistant coating adhering in a bond relation to said valve body on at least the wall surface of said shaft bore, the improvement comprising bearing means within said shaft bore separate from said shaft and in a position contiguous the coating in contact therewith for supporting said operator shaft for rotation.
Dependencies are inferred from the claim text.