Final answer:
Vacuum and Linear are types of E.G.R. valves, with Linear valves offering precise control. Butterfly valves, a type of Linear valve, are known for excellent throttling control.
Explanation:
Vacuum and Linear are types of E.G.R. valves. Vacuum valves operate based on the pressure difference between the vacuum source and the intake manifold, while Linear valves have a valve stroke directly proportional to valve travel.
Linear valves offer precise control in systems with constant pressure drops, making them suitable for various applications. They are commonly found in butterfly valves which provide excellent throttling control.
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