$(20$pts$)$ Below is a hydraulic circuit for a machine. Study it to see how it works, and then

answer the questions below.

A$.$ What is valve B$?$ Explain. $($exactly$,$ include actual result in THIS machine$)$

B$.$ What is component A$?$ What does it do$?$ How might it be used in a real machine?

$($What could be the purpose of such a component?$)$

C$.$ How does this machine operate when the DCV is shifted to the right position? How

does this differ from the left position of the DCV$?$ Explain this circuit.