Excavator Pipe-Rupture Valve CFS


The excavator pipe-rupture valve is used wherever so required by the standards ISO 8643, EN 474 and DIN 24093 for excavators with a lifting device (e.g. a load hook on the bucket). The actuators concerned are the lift cylinder, the stick cylinder and the adjusting cylinder. The valve should also be used on machines in which a pipe-rupture on the actuators could produce dangerous situations (e.g. machines for materials handling and demolition).

The excavator pipe-rupture valve, series CFS (Compact Flow Control and Safety Valve), prevents uncontrolled lowering of the actuator in the event of a pipe- or hose-rupture. In addition, the CFS valve holds the actuator in its position when the main valve is centred. The valve also includes a secondary pressure-relief function, which protects the actuator against overload. The inlet and actuator ports on the CFS are standard SAE flanged ports, and the valve can therefore be retrofitted to existing equipment without any difficulty.


  • Fulfils safety requirements in accordance with ISO 8643, EN 474 and DIN 24093
  • Leak-free load holding
  • Standard design → compact, very low weight
  • Flat design → with nose, ideal for boom cylinder
  • Satisfies exacting demands on corrosion protection → valve is zinc plated (Cr VI-free)
  • The control assembly is guaranteed to close → it closes even with a broken spring
  • No impact, or only very low impact on the existing hydraulic system → easy to retrofit

Technical Data

Type Design Port size
Operating pressure up to
Max. flow rate
Mounting method
CFS 16-ES... standard design ¾" 420 250 flange-mounting
CFS 16-EF... flat design ¾" 420 250 flange-mounting
CFS 20-ES... standard design 1" 420 350 flange-mounting


Simplified symbol


  • Excavators
  • Excavator-loaders 
  • Front loaders 
  • Rear loaders

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