Komatsu PC88MR-10 Shop Manual page 1413

90 Diagrams and drawings
Symbols in hydraulic circuit diagram
Symbols
Substances
Control valve
Single-acting solenoid valve
Single-acting proportional solenoid valve
Hydraulic pilot valve
Hydraulic two-stage pilot valve
Lock valve
Drain valve
Pressure regulator valve, Safety valve, Abnormal pressure prevention
valve
Pressure regulator valve, Safety valve, Abnormal pressure prevention
valve
(when the figure shows air pressure, being released to atmosphere)
Bypass valve
Accumulator
PC88MR-10 90-5