The valve shown in the illustration is...

The valve shown in the illustration is...

Question 1 of 270705eccef9bbacbc34ba4d4536a

The valve shown in the illustration is designed to seal against positive pressure leaks around the valve stem by the use of __________. See illustration GS-0047.

Question 1 of 27070

Q

The valve shown in the illustration is designed to seal against positive pressure leaks around the valve stem by the use of __________. See illustration GS-0047.

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This question does not have an illustration

🔍 Key Concepts

• Valve stem sealing methods in globe/stop valves • How an adjustable packing gland is constructed and where it sits on the stem • Visual differences between packing, O-rings, and mechanical seals in sectional drawings

💭 Think About

• Look carefully at the area where the stem passes through the bonnet—what component is being squeezed around the stem to control leakage? • Do you see separate circular rings, a spring-loaded cartridge, or a stack of soft material compressed by bolts? What type of seal does that usually indicate? • Which of the answer choices is typically used on manually operated globe valves for services where you occasionally tighten down bolts to stop stem leakage?

✅ Before You Answer

• Identify the shaded, hatched material around the stem and note how it is compressed from above. • Check whether there is any sign of an external piping line providing sealing medium; if not, eliminate that choice. • Note the bolts and follower pressing down on the sealing material—ask which option from the list is normally tightened to maintain a stem seal over time.