Atmospherically Reference Counterbalance valves are also known as load holding valves or over-centre valves. These versatile valves have various uses:

• Suitable for diverse applications such as lifting applications, hydraulic cylinder, winches, extensible movable bridge, etc
• Lowers velocity control and stationary load holding
• Provides protection against hydraulic line failure and pressure shocks when placed next to actuator
• A CA counterbalance valve is normally used in regeneration circuits and servo/proportional valve circuits.

Specifications of Atmospherically Reference Counterbalance valves (CA):

• Rated flow of up to 480 LPM
• Pressure range of 70 Bar – 350 Bar
• Maximum leakage at reseat (85% of setting) is 5 drops per minute
• Approximately 1 drop (0.07cc) of fluid will pass from the pilot area to the vented spring chamber every 4000 cycles

Special feature of of Atmospherically reference counterbalance valve (CA):

• Backpressure at port 2 does not affect the valve setting because the spring chamber is atmospherically vented.
• Full relief capacity.

 
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