Draw a well labelled circuit diagram and explain its working. State whether it is a meter in or meter out circuit.

• Compressed air is passed through DCV from port P to port A. it will enter in the FCV1 where flow area of FCV1 is reduced by partially closing the valve.
• Hence small quantity of air will enter in the air motor through inlet A. It will rotate the motor at slow speed.
• Similarly when flow area of the FCV1 is increased by fully opening the valve, it will supply full quantity of compressed air to the air motor through inlet A. As large quantity is supplied it will rotate the motor at high speed.
• We can control the speed in another direction using FCV2 and second position of DC valve.
• Hence by varying the flow quantity of air we can change the flow quantity of air we can change the speed of bi-directional motor.
• The check valve of circuit allows flow of air into the motor while regulate the outward flow hence it is ‘meter out’ circuit