5-10t Internal Combustion Counterbalance Forklift Truck Operation & Maintenance Manual
Slide valve is used to control lift and tilt cylinders. It achieves the aim for controlling cylinder by
changing oil flow rates through control over the lift and tilt valve stems.
A tilt auto-locking valve is mounted on the tilt slide valve, and the return oil from the cylinder shall
return to oil tank through the part of outlet. Respective plate valves are all sealed up using O-rings,
and at the same time a one-way valve is installed in the oil passage at the side of high pressure.
7.4 Operation of Multi-way Valve
(1)Middle Position: (Refer to Fig 7-2.)
The oil from the main pump returns to oil tank through the middle passage. At this point, both joints
A and B of cylinder are under the closed status.
Fig 7-2 Middle Position
(2)Push-in Slide Valve: (Refer to Fig 7-3.):
At this point the middle passage is under the closed status (not through). The oil from the oil inlet
port bursts through (load) the one-way valve and flows into the joint B of cylinder, and the return oil
from the joint A of cylinder returns to oil tank through low-pressure passage. By virtue of the return
spring, it is able to allow the slide valve to return to the middle position.
(3)Pull-out Slide Valve (Refer to Fig 7-4.):
At this point, the passage at the middle position is also under the closed status. The oil from the oil
inlet port bursts through (load) the one-way valve, and flows into the joint A of cylinder, while the
return oil from the joint B returns to oil tank through low-pressure passage. By virtue of the return
spring, it is able to allow the slide valve to return to the middle position.
Fig 7-3 Push-in Slide Valve Fig 7-4 Pull-out Slide Valve
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