These three pieces are parts from the Lillehei-Nakib Toroidal Disc Mitral valves. There is one donut, one valve without a cloth suture, and one complete valve. The design is toroidal, meaning donut ...

This is a Lillehei-Kaster tilting-disc valve made of pyrolytic carbon. Approximately 17,500 of these valves were distributed. It is made of titanium and pyrolite-coated graphite. It has a low embolic ...

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Fluid-handling devices are not basically concerned with the modulation of power, but only with the movement of fluid. Choosing a fluid-handling valve used to be easy, because each one had its own area ...

Bioprosthetic valves lasts about 10-15 years. These are usually obtained from animals or human organ donors. Tissue valves seem to improve the patient’s hemodynamics, but tend to stiffen in 10-15 ...

Learning the basics can ease loop tuning frustration and ensure stability. During plant operations, it seems that tuning control loops is an ongoing task, which can be a continual frustration to ...

A worksheet that calculates control valve installed gain can be part of any control valve selection process. For many years, the author has used, and promoted the use of, control valve installed flow ...