Daewoo Mega 500-V - Operation (A); Operation (B); Operation (Main Relief Valve); Operation in Inoperative State

S0709455K
Page 8
Main Control Valve (Toshiba)
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OPERATION (MAIN RELIEF VALVE)
Operation in Inoperative State
The pressure oil in the neutral oil passage (HP)
flows through the throttle hole (2) in the main
poppet (1) to fill the internal cavity (3). Owing to
the difference in area on which the hydraulic
pressure acts, the main poppet (1) closely seats
to the sleeve (4).
Operation (A)
When the pressure in the neutral oil passage
(HP) rises and exceeds the relief pressure
setting. the pilot poppet (5) opens. The pressure
oil flows from the pilot poppet into the low
pressure oil passage (LP). passing between the
sleeve (4) and the housing (6).
Operation (B)
As the pilot poppet (5) opens, the pressure in
the internal cavity (3) lowers to move the main
poppet (1) so that the pressure oil in the neutral
oil passage (HP) flows directly into the low
pressure oil passage (LP).
Figure 5 IN INOPERATIVE STATE
Figure 6 OPERATION (A)
Figure 7 OPERATION (B)