The example shows a circuit where flow to a counterbalance valve is reduced to increase stability. A sequence valve in parallel to the CBV diverts the majority of the flow away from the CBV.
- Standard counterbalance: CB**, MB**
- Direct sequence valve: SC**
- Needle valve: NF**
Benefits of this circuit arrangement:
- A counterbalance valve (CBV,) needle valve (NV) and sequence valve (SV) are connected to the full bore side of a cylinder as shown in the circuit.
- CBV is opened by the pressure created from a low-volume flow through the NV. This pressure also reduces the SV setting, allowing a larger volume of oil to flow through SV from the cylinder.
- The circuit gives a good resolution and good stability at low flows through CBV regulated by the pilot pressure to CBV.
- The direct-acting SV is suitable for load-holding applications and incorporates a reverse-free-flow check for cylinder extension.
For Sun technical support, contact Steve Weber.
