Page 93 - Pneumatic ebook (2)_draft 13 sept 2021

Flow Control Valve (FCV) and One Way FCV

Flow Control Valve is used to control the flow rate of the air flow which cause the speed of Flow control valve
actuator becomes slower. (bidirectional)

This flow control valve controls air flow in both directions. The arrow indicates that the valve is
adjustable which means the amount of air flow into the actuator can be adjusted accordingly.

One-way flow control valve controls air flow only in one direction which is through
the air throttle. Generally, this valve used to control speed of actuator and is installed
in the working pressure line, between the final control valve and the cylinder ports.

One way flow
control valve The one-way flow control valve is a combination of a flow control valve and a non
return valve.
1 2
When air flows from Port 1 to 2, it will choose the throttle path to flow since check
valve is blocked. Thus, air flow is controlled.

When air flows from Port 2 to 1, it will choose check valve path because it fully open.
Thus air is free flow

INTRODUCTION TO PNEUMATIC SYSTEM 42