New Mexico Pipe Fitter Journeyman (JPF) Practice Exam

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Study for the New Mexico Pipe Fitter Journeyman Exam. Prepare with flashcards and multiple choice questions, each question comes with hints and explanations. Get ready for your exam!

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Which of the following is NOT a type of valve stem mechanism?

Quick opening sliding stem
Outside screw rising
Inside screw falling
Inside screw rising stem / non-rising

The correct answer is: Inside screw falling

The inside screw falling mechanism described in the answer choice is not commonly recognized as a type of valve stem mechanism. Valve stem mechanisms are critical components that determine how a valve operates—specifically how they open and close to control fluid flow. The quick opening sliding stem allows for rapid valve opening, useful in applications requiring immediate flow control. The outside screw rising mechanism is characterized by a screw located on the outside of the valve, allowing for precise control as the stem rises directly with the valve. The inside screw rising stem/non-rising mechanism describes a situation where the stem moves up and down inside the valve body rather than traveling freely, allowing for controlled operation while maintaining a smaller profile. Understanding these distinctions is essential for anyone working in piping, as different mechanisms suit different applications based on design, space, and the functions needed.