Directional Control Valves
To change the direction of airflow to and from the cylinder, we use a directional
control valve. The moving part in a directional control valve will connect and
disconnect internal flow passages within the valve body. This action results in a
control of airflow
direction.
direction.
directional control
valve consists of avalve body with
four internal flow
passages within the
valve body and a
sliding spool.
Shifting the spool alternately connects a cylinder port to supply pressure or the
exhaust port. With the spool in the position where the supply pressure is connected
to port A and port B is connected to the exhaust port, the cylinder will extend. Then,
with the spool in the other extreme position, supply pressure is connected to port B
and port A is connected to the exhaust port, now the cylinder retracts. With adirectional control valve in a circuit, the cylinder's piston rod can be extended orretracted and work performed.
Categories:
Control,
Pneumatics System,
Valve
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