By Wayne Anderson
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Additional resources for Controlling Electrohydraulic Systems (Fluid Power and Control)
9 PRESSURE-REDUCING VALVES Many systems, from hydraulic test benches to sophisticated industrial machinery, use pressure-reducing valves. They are used in systems which have multiple functions. If there exists a pressure in a portion of a circuit which la too high for that function, the reducing valve will create a reduced supply. 17 Parallel pressure-compensated valves. High" pressure for system. 18 Tandem pressure-compensated valves o r i t y is set by upstream valve. Each section is individually compensated.
With high demands at each section, the loads can actually demand more than the pump can provide, causing slower response and less than required pressures at the loads. Sizing the pump to the load, with the valving configuration, becomes important in fulfilling the systern requirements. 16. 11 (four-way spool), and an unloading spool, that allows the supply to be dumped or temporarily relieved to tank. The interface between the two spools is the 'logic" built into the main (closed-center) porting spool.
A load-sensing electrohydrauiK. servovalve has been developed [1J which adds servo respome at proportional valve costs. I f the pump acts more as a source of energy for steady inputs, then the system can respond much faster. The dynamic characteristics of the pump are typically much slower than those of the valving arrangements. 25 is an electrohydraulic servovalve driving an m u a t o r . It is not very responsive either, because of the mass:/e armature. It is represented in block diagram form in Figure 2-26.