US 4,136,603 A · Diaphragm assembly

Abstract

A diaphragm assembly for use in highly corrosive industrial applications includes a metal body subject to corrosion and a diaphragm formed of a corrosion resistant metal. The metal of the diaphragm is metallurgically incompatible with the body metal. The diaphragm is nevertheless hermetically sealed to the body with the aid of a transition member having a first portion of metal which is metallurgically compatible with the body and a second portion of another metal metallurgically compatible with the diaphragm. Both portions are joined together by a sound, molecular bond, as for example, by using explosive bonding techniques. The first portion of the transition member is fusion welded to the body and the diaphragm is similarly welded to the second portion, thereby presenting at the process fluid interface a barrier that consists solely of corrosion resistant metal.

Claims14

Dependent claims

A diaphragm assembly for use with highly corrosive process fluids comprising:

a metal body including means defining a chamber therein, said body being subject to corrosion;
a diaphragm formed of a metal substantially resistant to corrosive attack, and being metallurgically incompatible with the metal of said body;
a transition member having a first portion of metal which is metallurgically compatible with said body and an adjacent second portion of a different metal which is metallurgically compatible with said diaphragm, both of said portions being joined together by a sound, hermetic molecular bond;
said first portion of said transition member being fusion welded to said body around said chamber;
said diaphragm being hermetically sealed to said body by fusion welding to said second portion of said transition member, whereby said metal body is protected from said corrosive fluids by a highly reliable barrier consisting solely of metal resistant to chemical attack.

2 more elements

Dependencies are inferred from the claim text.

Diaphragm assembly

Life of this patent

Diaphragm assembly

Life of this patent

Abstract

Claims14