SANY LATIN AMERICA
4-95
SY195/205/215/225C9 Crawler Hydraulic Excavator
Structure and Function
Shop Manual - June 2013
4.6.6.1 Operation of components
Counterbalance valve
Function
●
When external load makes the rotating
speed of the piston motor faster than the
rated rotating speed of supplied delivery,
this valve controls the speed of the motor
and prevent over-speed of the motor in re-
lation with the supplied delivery.
●
The counterbalance valve and the relief
valve constitute the braking circuit. The
braking circuit applies braking force onto
the rotating motor and stops the motor
gradually.
●
This valve can serve as a shuttle valve
for high pressure selection to release the
brake under its own pressure.
●
The structure of a standard counterbalance
valve is shown as below. The following in-
formation describes the operating principle
of a standard counterbalance valve.
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