VCB12-CN Counterbalance Valve
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comatrol hydraulic cartridge valves

Operation

 

This counterbalance valve is a 12 size metric, 3-ported, externally piloted low leakage, cartridge style valve with atmospheric vent.  The  check section allows free flow from the directional valve (port 2) to the load (port 3), while normally blocking flow from port 3 to port 2.  Reverse flow is blocked until pilot pressure is applied at port 1. When the pressure at port 3 rises above the pressure setting, the integral relief valve is activated and vents the area behind the pilot piston.

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Applications

Atmospheric vented valves are applied when it is not practical to connect a separate vent line to the tank. Use a single counterbalance valve when the load is unidirectional, such as aerial lifts, cranes, or winches. In load holding applications, they are suitable for use as hose-break valves when installed near or within an actuator. Dual cartridges can be used for controlling loads bi-directionally in motor applications, or for cylinders going over center. Since this valve is piloted at port 1, no cross port drilling is required when dual cartridges are mounted nose to nose in an HIC.

 

 

 

Specifications

Schematic 
Rated Pressure  350 bar [5075 psi]
Rated flow at 22 bar
[319 psi]    
  140 l/min
[37 US gal/min]  
Weight  0.93 kg [2.05 lb]
Pilot Ratio  4.7:1, 5.9:1, 6.9:1
Cavity  NCS12-3
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Performance Curve

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Dimensions

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Example Circuits

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Ordering Information

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Product Documents and Downloads
Download this file (VCB12-CN - 3D STP Files.zip)VCB12-CN - 3D STP Files.zip83 kB02-11-2014
Download this file (VCB12-CN Catalog Page.pdf)VCB12-CN Catalog Page.pdf371 kB02-11-2014
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