A. WHEN NORMAL B. WHEN DISCONNECTED
Figure 46. Velocity Fuse
VELOCITY FUSE
A velocity fuse (throttle valve) is mounted within the oil
circuit of lift cylinder, to limit the dropping speed under
a heavy load (see Figure 47). Under normal
conditions, the velocity fuse does not activate when
hydraulic flow is generated from the lift function. Oil
flows to the velocity fuse into cavities A, B, C, D, E, F
and G and into the lift cylinder.
In an emergency situation, caused by a significant
pressure drop in the system (ex. hydraulic hose burst),
the velocity fuse actuates. The hydraulic fluid moves
quickly from points G through A causing the internal
body of the velocity fuse to the move to the right,
closing off most oil flow. If this occurs the velocity fuse
considerably reduces the flow of the hydraulic fluid
leaving the cylinder, allowing the suspended load to
safely be lowered.
8000 YRM 2199 Hydraulic System
49
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