Which of the following statements represents a disadvantage associated with a spool-type, solenoid direct operating, directional control valves?
Back pressure on the outlet line must be steady to drain the lower spool chamber.
The valve sealing surface is often damaged through excessive throttling action.
The spool does not have hydro cushion capabilities to handle shock.
Close fitting spools occasionally stick due to the accumulation of hydraulic oil residues.
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