Free fall control (HS-FFB)

The lowering of loads is generally controlled with the active pump power against the load control valve. This costs extra energy and the speed is limited by the installed pump flow.

The lowering of the loads in free fall takes place without any energy and at high speed.
The HS-FFB free fall valve block is used for the controlled lowering and braking of loads in a free fall at high speed.
The HS-FFB has been designed with focus on Security, Reliability, Productivity, Energy efficiency, Comfort and Economy
HS-FFB guarantees precise and safe operation during lowering and braking of loads without energy supply. This is ensured by the sensitive control and the high resolution of the valves.

Many options are available to meet your specific requirements.

Benefits

Long life of the valves
short Process cycle
High dynamics
Fast and Safe shutdown.
Soft switching
Optimal controllability
High pressure rating

Properties

Various configurations available
Sensitive proportionality over the whole control range
Pressure relief valve is unaffected by back pressure

Applications

Mining excavator
Piling machines

Fonctions

Pilot operated
Counter balance function (Load control valve)
Pipe rupture valve
Secondary pressure relief
Pressure relief function
Pressure compensation between the left and right cylinder
Proportional throttle function
Data sheetReliabilityOptionsOn request
General data
Masse50 kg
Block materialHycut60
Stock temperature–30°C .. +80°C
Ambient temperature–30°C ..+55°C
Fluid temperature–30°C ..+85°C (Standard)
Surface protection (optional) Corrosion resistance regarding NSS ISO9227
Galvanized with 15μm thick film passivation400H red rust
Electro less nickels> 30 microns80H…120H red rust ...
OtherOn request
Control
Hydraulic
Electrical.
Hydraulic data
Operating pressure420bar
Opening pressure:6 bar
Pressure for maximal opening25bar
Viscosity range10..400 mm2/s
Recommended viscosity20..50 mm2/s
Filtration
NAS 1638Class: 18/16/13
ISO 4406:1999Class: 7
Fluid
Mineral oilHL; HLP; HLPD
Synthetic Ester fluids HEES: Biohyd SE-S; ARNICA S : HVLP/HEES Panolin HLP Synth; BIOHYD SE
Flow
NB16 200 L/Min @ 5bar
NB20 350 L/Min @ 5bar
NG25 500 L/Min @ 5bar