8.2 Cut—off valve
8.2 Cut—off valve
At the bottom of the two lift cylinders are two cut—off valves(See fig.8-1 No.19 or
At the bottom of the two lift cylinders are two cut—off valves(See fig.8-1 No.19 or
fig.8-2 No.18) which operate when the high—pressure hose bursts for any reason to
fig.8-2 No.18) which operate when the high—pressure hose bursts for any reason to
prevent the load from dropping down abruptly.The oil from
prevent the load from dropping down abruptly.The oil from
the lift cylinder flows through
the lift cylinder flows through
small holes in the
small holes in the
circumference of the cut—off piston and
circumference of the cut—off piston and
produce a pressure difference
produce a pressure difference
between two chambers.As the pressure difference as result of passing the holes is smaller
between two chambers.As the pressure difference as result of passing the holes is smaller
than the spring force so that the cut—off spool won’t move.If the high—pressure hose
than the spring force so that the cut—off spool won’t move.If the high—pressure hose
bursts,it allows only a small amount of oil to flow through the holes in the spool head to let
bursts,it allows only a small amount of oil to flow through the holes in the spool head to let
the forks descend at low speed.
the forks descend at low speed.
Fig.8.3 Cut-off valve
Fig.8.3 Cut-off valve
8.3 Flow regulator
8.3 Flow regulator
The flow regulator valve is located between the control valve and the high pressure
The flow regulator valve is located between the control valve and the high pressure
ports of the two lift cylinders,near the left cylinder (See fig.8-4).The structure of the flow
ports of the two lift cylinders,near the left cylinder (See fig.8-4).The structure of the flow
regulator valve as shown in Fig.8-5.The structures of 8 ton and 10 ton forklift trucks are
regulator valve as shown in Fig.8-5.The structures of 8 ton and 10 ton forklift trucks are
almost the same as 5 to 7 ton forklift trucks.No.3 in fig.8-5 is taper helical spring for 8 ton
almost the same as 5 to 7 ton forklift trucks.No.3 in fig.8-5 is taper helical spring for 8 ton
forklif
forklif
t trucks and is
t trucks and is
coil spring for 10 ton forklift trucks.
coil spring for 10 ton forklift trucks.
The flow regulator valve serving both as
The flow regulator valve serving both as
a flow regulating valve while
a flow regulating valve while
forks are being
forks are being
lowering and a safety device if rubber hoses between the control valve and lift cylinders
lowering and a safety device if rubber hoses between the control valve and lift cylinders
are damaged due to any reason.
are damaged due to any reason.
The operation of the flow regulator valv
The operation of the flow regulator valv
e is given below.
e is given below.
N
N
a
a
t
t
u
u
r
r
a
a
l
l
c
c
o
o
n
n
d
d
i
i
t
t
i
i
o
o
n
n
s
s
C
C
u
u
t
t
-
-
o
o
f
f
f
f
c
c
o
o
n
n
d
d
i
i
t
t
i
i
o
o
n
n
s
s
-99-
-99-
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