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Fig.8-4 Pilot Joystick
(5) Pilot Oil Supply
The pilot oil supply provides pressure oil to the leading service of the control
valve. It consists of the relief valve, overflow valve, accumulator and so on. Because
the pilot joystick requires the pressure is 3.5 bar, intention of the relief valve minishes
the pressure. The task of Accumulator provides margin of energy. When the driver
operates the Joystick with consecutive and real time, the accumulator will set free its
margin of energy. The maximum pressure is limited by the overflow valve.
Fig.8-5 Pilot Oil Supply
(5) Cylinder safety lock valve
The Cylinder safety lock valve mainly consists of the crust, the main valve spool,
control piston, damping hole. It is provided with the following functions:
------Prevents uncontrolled movement of the cylinder should a hose or pipe burst.
It is be of twin shafts about the Joystick.It
may control the lift cylinder or tilt cylinder by
360 rotation 。when the driver pushes up the
Joystick small ,the mast begins to move
slowly.If the driver wants to increase the
speed of the mast ,he needs continue pushing to
the Joystick;When the driver pushes up the
Joystick to direction of 45
0
,he can abtain two
motions together .Of course ,change the
direction and angle of the Joystick,you can
control the speed and the direction of mast .
It is comfortable for the single lever too .
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