🔍 Key Concepts

• Linkage motion between parts D and E (they are joined by a pin, and E pivots about its own center). • How rotation of a bellcrank converts motion from one direction into another (up‑down vs left‑right). • Which end of the sliding valve contacts G and which contacts H, and how motion of E will push or pull on that valve rod.

💭 Think About

• If part D rotates clockwise about its lower pivot, in what direction does the connecting pin at the top of D move (left, right, up, or down)? • Given that motion of that pin, look at the pivot point of E. Would E have to rotate clockwise or counterclockwise to follow that pin’s motion? • Once you know E’s rotation, does the upper link between E and the valve rod move the valve toward part G or toward part H?

✅ Before You Answer

• Be sure you have correctly identified the fixed pivots (what points are bolted to the housing and cannot move). • Verify the relative positions of G and H on the sliding valve so you know which way the valve shifts when the upper link moves. • Double‑check whether your assumed motion of the D–E connecting pin is realistic for a clockwise rotation of D (sketching two positions of D can help).