Which of the following statements is true...

🔍 Key Concepts

• Identify whether the stem moves up and down with the handwheel (rising stem) or only turns in place (non-rising stem). • Consider what type of valve this appears to be based on the internal shape and flow path (e.g., gate vs. globe and which is normally used for throttling). • Look closely at how the seat and disc are arranged and whether they could be removed for repair or replacement.

💭 Think About

• From the illustration, what happens to the stem position relative to the valve body when you would turn the handwheel—does the threaded portion travel vertically or stay inside the bonnet? • Does this valve’s internal passageway look suited to quick full-open/close service or to gradual control of flow? How does that affect whether it’s normally used for throttling? • Can you see separate seat pieces threaded or fitted into the body, or does the seat appear to be an integral, non-removable part of the casting?

✅ Before You Answer

• Verify whether the stem is visibly projecting further out of the valve as it moves—this indicates a rising stem rather than a non-rising design. • Check whether the flow passage is straight-through or forced to change direction, as in a globe-type valve commonly associated with throttling service. • Confirm if there are distinct seat rings or threaded interfaces that would allow seat maintenance or replacement, rather than assuming they cannot be repaired.

Which of the following statements is true concerning the valve shown in the illustration? Illustration GS-0047

The valve only requires one turn of the handwheel to fully open.

The valve seats cannot be replaced or repaired.

The valve is normally used to throttle the flow of liquid.

The valve is a non-rising stem design.

🔍 Key Concepts

💭 Think About

✅ Before You Answer