3 FIG 1 Solutiona The figure shows a double acting cylinder

Solution

(a)

The figure shows a double acting cylinder direct control circuit. Valves 1 and 2 depict the pneumatic symbol. Valve 5 shows the input/output device of the memory control circuit

(d)

The system moves cyclically when activated. The position of valve 5 would be determined by the positions of valve 3 and 4 whch eventually would give 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 allows air to flow and operate valve 5 resulting in the reversing in 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.

(e)

Valves 1 and 2 are flow control valve that controls the flow.