Cushion Lock on One Side of a Cylinder Only

The example shows advantages of replacing a vented counterbalance valve with a standard valve plus check valve.

• Vented counterbalance valve:    CW**
• Standard counterbalance valve:  CB**
• Standard check Valve:                 CX**

Benefits of this circuit arrangement:

• Fig.1 shows a circuit with a vented counterbalance valve that is used for high pressure in the return line.
• Fig. 2 shows a less expensive standard counterbalance valve as alternative. This circuit will require an additional tank port.
• Fig. 2 also allows sizing the counterbalance valve for the actual flow through the valve during load lowering and using a check valve for higher flow during lifting. The vented counterbalance valve in figure 1 may have been chosen for sufficient capacity across the reverse free flow check (50 gpm). The oversized counterbalance valve then is potentially unstable during load lowering (25 gpm).