DH6/10

Counterbalance valve – with unloading function
Counterbalance valve – with unloading function
Overview
This counterbalance valve is used to
prevent load drop within a cylinder under
overrunning load conditions and to control
its lowering speed.
Type indication
Features
1. As the spool of the counterbalance valve is
provided with the flow control part and seat part
together, stable brake pressure can be obtained
and at the same the leakage amount is small and
the slipping-down amount of ram can be made
very small.
2. When weight drop (fast feed state) is changed to
pressurization (slow feed state), ram speed
change can be adjusted and smooth
operation can be performed by controlling
spool valve closing speed with variable
throttle.
3. The passage in the casing is composed of
through holes and the flow resistance is small.
Counterbalance valve
with unloading function
Nominal dimension
15, 25, 40
Type of hydraulic oil
No symbol
V
W
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Mineral based hydraulic oil
Phosphate ester based hydraulic oil
Fatty ester based hydraulic oil
Water-glycol based hydraulic oil
Connection method
P = Gasket connection type
Series number: 3, 2
Brake pressure
100
150
210
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09.8 MPa
7.814.7 MPa
14.720.6 MPa
(varies depending on self-weight of ram)
Spool notch area symbol
Symbol
25
100
Brake flow during pressurization
120L/min or less
120/Lmin or more
Hydraulic symbols
Specifications
Nominal dimension
Maximum working pressure MPakgf/cm 2
Maximum flow rate L/min
Cracking pressure MPa (kgf/cm 2 )
Stroke volume of spool cm 3
(during activation of external pilot pressure)
Mass kg
2-64