You would open the illustrated valve "A" by...

🔍 Key Concepts

• Identify how the stem threads are cut and how turning the hand wheel moves the stem up or down in Figure A. • Determine the function of parts #4 and #8 – are they packing/gland components or a locking device that must be loosened before the stem can turn? • Recall normal operation of a rising‑stem globe valve ("lefty‑loosey/righty‑tighty" as viewed from the operator’s position) and when that might be reversed.

💭 Think About

• Look closely at the cross‑section in Figure A: if the hand wheel turns clockwise from the top, does the stem move toward or away from the valve seat? What about counterclockwise? • Ask yourself whether the valve could operate properly if you had to loosen #4 or #8 every single time you opened or closed it. What does that suggest about the purpose of those parts? • Compare Figure A and Figure B: which one shows the valve open and which shows it closed? From that, infer which direction the hand wheel must have been turned.

✅ Before You Answer

• Verify whether #4 is clamping sealing/packing material around the stem (meaning it normally stays tight during operation) or actually locking the stem from turning. • Verify whether #8 is part of the body/bonnet structure or a separate lock that must be released – look at whether it directly contacts the hand wheel or stem. • Before choosing, trace the thread path: imagine the stem nut fixed in the bonnet and decide which rotation of the hand wheel will raise the stem and lift the disc off the seat.

You would open the illustrated valve "A" by __________. See illustration GS-0140.

turning the hand wheel clockwise, as viewed from the top

first loosening part #4, opening the valve then retightening part #4

turning the hand wheel counterclockwise, as viewed from the top

first loosening part #8, then turning the hand wheel counterclockwise as viewed from the top

🔍 Key Concepts

💭 Think About

✅ Before You Answer