🔍 Key Concepts

• Identify the type of valve shown (note the swinging element and flow direction). • Consider how maintenance is usually performed on this kind of valve — what parts are typically replaced vs. what stays in place. • Look at how the disk is attached and how the bonnet/cover is bolted on to understand what can be removed independently.

💭 Think About

• From the illustration, can the swinging disk be separated from its arm or hinge pin without replacing the whole body? • Does anything in the drawing suggest provisions for an external feedback line or adjustment of lift height? • Which option best matches normal construction and maintenance practice for a swing‑type check valve like the one shown?

✅ Before You Answer

• Carefully trace how the disk is connected to the hinge/arm and whether that joint looks removable. • Note the function of the bonnet/cover and cap — do they control lift, or just provide access? • Ask whether any option describes a feature that is not visible at all in the illustration; those are less likely to be correct.