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Today's automation industry quiz question comes from the ISA Certified Automation Professional certification program. ISA CAP certification provides a non-biased, third-party, objective assessment and confirmation of an automation professional's skills. The CAP exam is focused on direction, definition, design, development/application, deployment, documentation, and support of systems, software, and equipment used in control systems, manufacturing information systems, systems integration, and operational consulting. Click this link for information about the CAP program. This question is from the CAP study guide, Performance Domain III, System Design.
Which of the following control valve body styles is MOST likely to develop blockage in a paper-pulp slurry service?
a) pinch
b) characterized ball
c) butterfly
d) globe
e) none of the above
A globe valve consists of a plug on the end of a stem that moves the plug onto a seat. Because of the body design of this valve, cavities in the body can easily fill with materials and develop blockage. Ball, butterfly and pinch valve body style have straight-through flow, which is less likely to develop blockage.
The correct answer is D, globe.