1. The problem statement, all variables and given/known data Figure 1 shows a pneumatic circuit diagram used for air supply and exhaust in an automatic control system. Question: State how the system works. 2. Relevant equations N/A 3. The attempt at a solution Once the system is activated the piston will begin to move cyclically. The position of valves 3 and 4 will determine the position of valve 5 and intern; the direction in which the piston will move. The output of the system is used to determine the input signal. When the piston is fully retracted, valve 3 will be opened, this will then allow air to flow and operate valve 5. This will reverse the direction of the piston. When the piston reaches maximum outstroke, valve 4 will be activated; which will cause valve 5 to reset to its original position and the piston will begin to retract. The piston’s speed is controlled with the use of the two variable restrictors on the exhaust ports of the cylinder.