J. Peter Clark

Like many engineers, I have casually drawn in symbols for valves on process flow sheets, turned them on and off in plants, and taken quite a few apart without really thinking about how they work or the subtle effects of their designs. Valves, of course, are devices to close off and regulate the flow of fluids in pipes and from vessels.

Many types have evolved over the years to cope with various pressures, suspended solids, and economics of fabrication, and to ensure ease of use and convenience of…

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