Single Counter Balance Valves

Single Counter Balance valves are widely used for stabiliser legs, cranes & any other hydraulic use where it is essential that a cylinder or load does not drop or loose pressure if hydraulic power is lost ie. broken hose or fitting.

These are a mandatory safety item for many hydraulic applications.

Adding a counterbalance valve controls lowering motions and provides protection against hose, tube or engine failure.

This valve controls a moving load in ONE direction, it prevents loads with gravity assit from moving ahead of the pump's supply flow & locks the load in any position on C1.

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.

These are quality items made in Italy.

Various ratios available,

Please note Instability can occur when the valve overreacts due to changes in load or mechanical friction within the machine.

A low pilot ratio limits the movement of the poppet, therefore restricting the change in flow caused by the opening and closing of the valve.

Please read below for more guidelines.

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 4.25:1) 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. # Standard
• 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 to provide maximum load holding protection in the event of hydraulic line failure.
• Do not use counterbalance valves 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.

WARNING! IMPROPER SELECTION, INSTALLATION, IMPLEMENTATION AND/OR OPERATION BY ANYONE OTHER THAN PERSONS WITH APPROPRIATE TECHNICAL AND MECHANICAL TRAINING CAN RESULT IN DAMAGE TO EQUIPMENT OR PROPERTY, SERIOUS PERSONAL INJURY OR DEATH. PROPER PRECAUTIONS AND SAFETY PROCEDURES SHOULD BE IMPLEMENTED PRIOR TO THE INSTALLATION AND OPERATION OF EQUIPMENT.

DLM $ 13/09/23