For controlling overrunning loads, two counterbalance valves and a pressure-compensated flow control valve are used in the return line of an actuator.
- Load-sensitive counterbalance: CB**, CW**,CA**
- Flow control valve: FC*B
Benefits of this circuit arrangement:
- A pressure-compensated flow control valve (FC) controls the inlet flow to the cylinder
- 75% of the outlet flow from the cylinder is passed to a high-ratio (10:1) CB via a pressure-compensated flow control valve.
- The remaining 25% of the outlet flow is controlled by a low-pilot-ratio (3:1) CB. Since the counterbalance valve can be restrictive with low pilot ratio, the circuit is more stable than a circuit with a larger counterbalance valve.
Note: Meter-in & meter-out functionality is only available during the extension of the cylinder. Flow controls for the retraction of the cylinder may be required.
For Sun technical support, contact Steve Weber.
