31 - 1
Precautions During Use
Installation
Ensure that excessive force is not put on the valve by the
piping.
Tighten the installation bolts to the specified torque.
Take care when welding work is done near the valve,
excessive heat can damage the seals.
To prevent foreign matter from entering the ports, do not
remove the plugs from the ports until installation.
Running
Operate only after confirming that the hydraulic circuit and
hydraulic oil are clean.
Use the hydraulic oil specified in this manual.
Do not raise the pressure of the main relief valve or port
relief valve set pressures.
The difference between the main relief valve and port relief
valve set pressures should be more than 20 kgf/cm
2
(285
lbf/in
2
).
Carry out warming up sufficiently before beginning actual
operations. Because of the low temperature of the oil and
valve, note the following points in particular, to prevent
seizure of the main spools due to heat shock:
1 Do not operate the main relief valve or port relief valve
continuously on a cold machine, but operate so that the
hydraulic oil in each ram can circulate, thereby warming
up each part uniformly.
2 Fine and combined operations cause heat build-up, do
not perform sudden operations at low temperatures.
Section E Hydraulics
9803/6410
Section E
31 - 1
Issue 1
Control Valve
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