Baoli CPCD 80, Инструкция по эксплуатации и обслуживанию

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6.5 Main safety valve operation
(1)The main safety valve must be installed between the cylinder HP port and LP
passage. The oil that pass through the valve core will be acting on the different diameter
surface A & B, so the core K of the one-way valve and the core D of the main safety
valve will be firmly fall into the valve base. (See Fig.6.5)
(2)When the oil pressure of the cylinder HP port is overrun the spring limit pressure,
the precursor valve core E will be open, and the oil will inflood the hole via the valve
core circumference, then reach the LP passage. (See Fig.6.6)
(3)Once the precursor valve core E is open, the back pressure of the core C will be
reduced, so the core C will be shift to the right direction, then be on the core E. As a
result, the back oil route of the core D will be cut off, the inside pressure will be also
reduced. (See Fig.6.7)
(4)Compared with the cylinder port HP, the inside pressure is imbalance, then the
safety valve core will be open, so the oil of the HP side will reach LP passage directly.
(See Fig.6.8)
Fig.6.5 Fig.6.6
Fig.6.7 Fig.6.8