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.. The typical directional control valve consists of a valve 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 a directional control valve in a circuit, the
cylinder's piston rod can be extended or retracted and work performed
No comments:
Post a Comment