S0709455K
Page 10
Main Control Valve (Toshiba)
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Operation (C)
The pressures across the relief valve poppet (3)
loses balance. Due to pressure differential, the
relief valve poppet moves so that the pressure
oil at the cylinder port (HP) flows directly to the
low-pressure oil passage (LP).
Sucking Operation
If the pressure at the cylinder port (HP)
becomes lower than that at the low-pressure oil
passage (LP) due to the development of
cavitation, the check valve poppet (2) moves
depending upon the difference in area on which
negative pressure acts across the check valve
poppet. Consequently, oil is supplied from the
low-pressure oil passage (LP) to the cylinder
port side (HP) to eliminate the cavitation.
Figure 11 OPERATION (C)
Figure 12 SUCKING OPERATION
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