Emerson Process Management’s complete line of Fisher valves and Fieldvue digital valve controllers has received Lloyd’s Register’s Marine Type Approval for process control applications within the ...

THE thermionic valve has long been recognized as a useful tool in many branches of science and engineering; but few, with the exception of experimenters, have realized that it can be usefully applied ...

(Reuters Health) - People who need a heart valve replaced often face a dilemma: should they have a mechanical valve made of graphite or a biological valve derived from a cow or pig? A new study ...