HELI CPD15, Руководство по эксплуатации и обслуживанию

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5.1.2 Control Valve
The external of the control valve as shown in Fig. 5-3.
Figure 5-3 Control valve
The control valve adopts two pieces and four body type. The hydraulic oil from
working pump distributes the high-pressure oil to the lifting cylinder or tilting cylinder
through the control of valve stem. There are safety relief and tilt-locking valves inside the
control valve. The safety relief valve is at the top of oil inlet of control valve to control
the pressure of the system. The tilt-locking valve is on the tilt valve block and is mainly
used to prevent the serious consequence due to wrong operation of control rod when the
tilt cylinder has no pressure source. The check valve is mounted between oil inlet and
inlet port of lifting valve block and between oil inlets of lifting and tilt valve blocks.
Main safety valve
Tilting sliding valve lifting sliding valve