Optimal flow rate (speed) is achieved by controlling the amount of the spool shifted in the proportional electrohydraulic valve; the spool is shifted proportional to…

This circuit changes the speed of the cylinder motion by employing two flow control valves. Shifting to high speed, change over the solenoid operated directional…

This circuit balances (holds up) the weight by using the balancing valve. The balancing valve cannot hold up the weight if the pump does not…

Releasing compressed working fluid instantly back to a reservoir generates shock waves. Compressed working fluid must be released gradually. In Fig. 15.7, compressed working fluid…

In the cylinder-forwarding process (solenoid OFF), circuit pressure is kept at 10 MPa (1 450 psi). But, in the cylinder returning process (solenoid ON), circuit…

When pump pressure is lower than PL, the angle of the swash plate becomes maximum, and the output flow reaches to the maximum (the flow…

Pressure switch PS is correlated with the solenoid valve; when the circuit pressure equals the pressure set in the pressure switch PS, the solenoid valve…

The circuit shown in Fig. 15.3 contains ® a low pressure and large volume pump and © a high pressure and small volume pump. The…

This circuit reduces the amount of output flow rate by using the variable displacement pump with pressure compensating function. The pressure of the system is…

Figure 15.1 (a) shows a circuit in which output flow from the pump is by-passed to the reservoir with the spool of the PT connection…