Figure 10.5 illustrates the use of a counterbalance or backpressure valve to keep a vertically mounted cylinder in upward position during pump idling.
The counterbalance valve is set to open at a pressure slightly above the pressure required to hold the piston up. This permits the cylinder to be forced downward, when pressure is applied on the top. The open center direction control valve unloads the pump. The DCV used here is a solenoid-actuated, spring-centered valve with an open center flow path configuration.
