This is a Dual Counter Balance/Over Centre valve with open centre and internally vented. It is
adjustable from 30 to 210 bar (450 to 3100 PSI) These valves are widely used
for stabiliser legs, winch motors, hydraulic cylinders and other motors where
it is essential a function does not drop or rotate if hydraulic power, flow or
pressure is lost or when a hydraulic hose, pipe or fitting is damaged.
These are a mandatory safety item for many hydraulic lifting
applications. We have installed these valves on boom and dipper arm cylinders
on excavators and Backhoes that are also used to lift equipment and materials
such as pipework on construction sites.
Adding a counterbalance valve better controls the down motion and
also provides protection when lowering a load, the load has to be driven down
with the machine's pump pressure rather than allowing gravity to pull on the
load. This gives the machine operator a much finer feel and control of the
machine's movement and speed.
Counterbalance valves will positively hold a pressurized load and
will control the motion of the load based on application of a pressure signal
to the pilot port.
Single inline counterbalance valves are also available at about
60% the cost of a dual counterbalance valve.
This valve controls a moving load in BOTH directions, preventing
it from moving ahead of the pump & locks the load in any position on C1 or
C2. You can adjust the counterbalance valves with an Allen key to speed or slow
the cylinder travel to equal out two cylinder speeds. 1 full turn equals 'approx.
1000 PSI per turn.
Made in Italy.
Pressure Rating = 30-210bar (450-3150 PSI) or 60- 350 bar
Please leave message with choice of PSI ##
Flow = 40 LPM
Ratio = 4.25:1
Size = 3/8" Full Bore
Ports = 2 x 3/8" BSPP Female.
Materials of Construction
Body = Zinc Plated Steel
Seals = Viton.
Some additional guidelines for counterbalance valve applications:
Specify the counterbalance valve relief setting high enough to
stop any motion (flow) at the maximum expected actuator pressure. Generally it
is recommended to use a setting of 1.3 multiplied by the maximum load pressure.
Use low pilot ratios (3:1 and 4.5:1) for applications where loads
may vary widely. Low pilot ratios require higher pilot pressure and are less
efficient but provide stable, precise control for varying loads.
Use high pilot ratios (8:1 and 10:1) for applications where loads
are relatively constant. High pilot ratio valves require lower pilot pressure,
have faster response, and are more efficient, but lack stability and precision
in response to varying loads.
Do not oversize counterbalance valves. There is no pressure drop
operating limit for counterbalance valves and in fact some pressure drop is
required to maintain valve operation.
Locate counterbalance valves at or near the actuator(ram) to
provide maximum load holding protection in the event of hydraulic line failure.
Counterbalance valves should not be used with closed-center
directional control valves. Pressure trapped between the directional control
valve and the actuator can pilot the counterbalance valve open and result in
undesired load motion.
Do not use counterbalance valves with tandem-center directional control valves.
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